CINXE.COM
particle physics – Department of Physics – UW–Madison
<!DOCTYPE html> <html lang="en-US" prefix="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb#" class="no-js"> <head> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="preload" href="https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/fonts/uw-rh/redhat-display-latin.v14.woff2" as="font" type="font/woff2" crossorigin> <link rel="preload" href="https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/fonts/uw-rh/redhat-text-latin.v13.woff2" as="font" type="font/woff2" crossorigin> <!-- Global site tag (gtag.js) - Google Analytics --> <script async src="https://www.googletagmanager.com/gtag/js?id=G-HDEG1JB5JH"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-HDEG1JB5JH', { 'cookie_domain': 'none' }); </script> <script>(function(H){H.className=H.className.replace(/\bno-js\b/,'')})(document.documentElement)</script> <title>particle physics – Department of Physics – UW–Madison</title> <meta name='robots' content='max-image-preview:large' /> <style>img:is([sizes="auto" i], [sizes^="auto," i]) { contain-intrinsic-size: 3000px 1500px }</style> <link rel='dns-prefetch' href='//cdn.wisc.cloud' /> <link rel="alternate" type="application/rss+xml" title="Department of Physics » Feed" href="https://www.physics.wisc.edu/feed/" /> <link rel="alternate" type="application/rss+xml" title="Department of Physics » Comments Feed" href="https://www.physics.wisc.edu/comments/feed/" /> <link rel="alternate" type="application/rss+xml" title="Department of Physics » particle physics Category Feed" href="https://www.physics.wisc.edu/category/particle-physics/feed/" /> <link rel='stylesheet' id='sbi_styles-css' href='https://www.physics.wisc.edu/wp-content/plugins/instagram-feed/css/sbi-styles.min.css?ver=6.6.1' media='all' /> <style id='classic-theme-styles-inline-css'> /*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} </style> <link rel='stylesheet' id='bg-shce-genericons-css' href='https://www.physics.wisc.edu/wp-content/plugins/show-hidecollapse-expand/assets/css/genericons/genericons.css?ver=6.7.1' media='all' /> <link rel='stylesheet' id='bg-show-hide-css' href='https://www.physics.wisc.edu/wp-content/plugins/show-hidecollapse-expand/assets/css/bg-show-hide.css?ver=6.7.1' media='all' /> <link rel='stylesheet' id='parent-style-css' href='https://www.physics.wisc.edu/wp-content/themes/uw-theme/style.css?ver=6.7.1' media='all' /> <link rel='stylesheet' id='child-style-css' href='https://www.physics.wisc.edu/wp-content/themes/uw-physics/style.css?ver=1.0.4' media='all' /> <link rel='stylesheet' id='uwmadison-style-css' href='https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/main.min.css?ver=1.35.1' media='all' /> <!--[if lt IE 10]> <link rel='stylesheet' id='uwmadison-ie-css' href='https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/css/ie.css?ver=1.35.1' media='all' /> <![endif]--> <link rel="https://api.w.org/" href="https://www.physics.wisc.edu/wp-json/" /><link rel="alternate" title="JSON" type="application/json" href="https://www.physics.wisc.edu/wp-json/wp/v2/categories/89" /><link rel="EditURI" type="application/rsd+xml" title="RSD" href="https://www.physics.wisc.edu/xmlrpc.php?rsd" /> <!-- Generic meta tags --> <meta name="description" content="Research, teaching and outreach in Physics at UW–Madison" /> <!-- Open Graph meta tags --> <meta property="og:title" content="particle physics" /> <meta property="og:url" content="https://www.physics.wisc.edu/2024/10/17/hawc-detection-of-an-ultra-high-energy-gamma-ray-bubble-around-a-microquasar/" /> <meta property="og:description" content="Research, teaching and outreach in Physics at UW–Madison" /> <meta property="og:site_name" content="Department of Physics" /> <meta property="og:type" content="website" /> <meta property="og:image" content="https://www.physics.wisc.edu/wp-content/uploads/2024/10/hawc_site_201611_hires-1024x565.jpg" /> <meta property="og:image:alt" content ="An array of silos with a snow-capped mountain in the background" /> <meta property="og:image:height" content="353"/> <meta property="og:image:width" content="640"/> <!-- Schema.org meta tags --> <meta itemprop="name" content="particle physics"> <meta itemprop="description" content="Research, teaching and outreach in Physics at UW–Madison"> <meta itemprop="image" content="https://www.physics.wisc.edu/wp-content/uploads/2024/10/hawc_site_201611_hires-1024x565.jpg"> <!-- Twitter meta tags --> <meta name="twitter:card" content="summary" /> <meta name="twitter:title" content="particle physics" /> <meta name="twitter:description" content="Research, teaching and outreach in Physics at UW–Madison" /> <meta property="twitter:image" content="https://www.physics.wisc.edu/wp-content/uploads/2024/10/hawc_site_201611_hires-1024x565.jpg" /> <meta property="twitter:image:src" content="https://www.physics.wisc.edu/wp-content/uploads/2024/10/hawc_site_201611_hires-1024x565.jpg" /> <meta property="twitter:image:alt" content ="An array of silos with a snow-capped mountain in the background" /> <!-- START - Open Graph and Twitter Card Tags 3.3.3 --> <!-- Facebook Open Graph --> <meta property="og:locale" content="en_US"/> <meta property="og:site_name" content="Department of Physics"/> <meta property="og:title" content="particle physics"/> <meta property="og:url" content="https://www.physics.wisc.edu/category/particle-physics/"/> <meta property="og:type" content="article"/> <meta property="og:description" content="Research, teaching and outreach in Physics at UW–Madison"/> <!-- Google+ / Schema.org --> <meta itemprop="name" content="particle physics"/> <meta itemprop="headline" content="particle physics"/> <meta itemprop="description" content="Research, teaching and outreach in Physics at UW–Madison"/> <!--<meta itemprop="publisher" content="Department of Physics"/>--> <!-- To solve: The attribute publisher.itemtype has an invalid value --> <!-- Twitter Cards --> <meta name="twitter:title" content="particle physics"/> <meta name="twitter:url" content="https://www.physics.wisc.edu/category/particle-physics/"/> <meta name="twitter:description" content="Research, teaching and outreach in Physics at UW–Madison"/> <meta name="twitter:card" content="summary_large_image"/> <!-- SEO --> <!-- Misc. tags --> <!-- is_category --> <!-- END - Open Graph and Twitter Card Tags 3.3.3 --> <link rel="profile" href="http://gmpg.org/xfn/11"> <link rel="apple-touch-icon" href="https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/images/favicons/apple-touch-icon.png"> <link rel="icon" type="image/png" sizes="32x32" href="https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/images/favicons/favicon-32x32.png"> <link rel="icon" type="image/png" sizes="16x16" href="https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/images/favicons/favicon-16x16.png"> <link rel="manifest" href="https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/images/favicons/site.webmanifest"> <link rel="mask-icon" href="https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/images/favicons/safari-pinned-tab.svg" color="#c5050c"> <link rel="icon" href="/favicon.ico"> <meta name="msapplication-TileColor" content="#c5050c"> <meta name="msapplication-config" content="https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/images/favicons/browserconfig.xml"> <meta name="theme-color" content="#ffffff"> </head> <body class="archive category category-particle-physics category-89 uw-white-bg"> <a class="show-on-focus" href="#main" id="skip-link">Skip to main content</a> <div class="uw-global-bar " role="navigation"> <a class="uw-global-name-link" href="https://www.wisc.edu" aria-label="University of Wisconsin Madison home page">U<span>niversity <span class="uw-of">of</span> </span>W<span>isconsin</span>–Madison</a> </div> <header class="uw-header uw-has-search"> <div class="uw-header-container"> <div class="uw-header-crest-title"> <div class="uw-header-crest"> <a href="https://www.physics.wisc.edu/" aria-hidden="true" tabindex="-1"><svg viewBox="0 0 55.5 87.28" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e236e2e43.62516215"> <title id="dynid674f1e236e2e43.62516215">UW Crest</title> <style> .cls-1{fill:url(#Web_Shield_blend);} .cls-2{fill:#282728;} .cls-3{fill:#c5050c;} .cls-4{fill:#fff;} </style> <g> <radialGradient id="Web_Shield_blend" cx="46.25" cy="16.57" r="33.44" gradientTransform="translate(-22.22 26.01) scale(1.09 1.09)" gradientUnits="userSpaceOnUse"><stop offset="0.17" stop-color="#fff"/><stop offset="0.3" stop-color="#f6ede4"/><stop offset="0.69" stop-color="#debe9b"/><stop offset="0.87" stop-color="#d4ac7f"/></radialGradient> </g> <path id="Gold_gradient" data-name="Gold gradient" class="cls-1" d="M28,87.36a3.78,3.78,0,0,1-1.05-1.16l-0.06-.09-0.11,0C8.65,81.86-1.45,54,.83,31.71a47.71,47.71,0,0,1,1.29-7.25,35.39,35.39,0,0,1,2.33-6.39,23.55,23.55,0,0,1,3.75-5.65A14.7,14.7,0,0,1,19,7.28,0.33,0.33,0,0,0,19.33,7,5.49,5.49,0,0,1,23.21,4.4l0.19,0,0-.19A4.69,4.69,0,0,1,28,.64a4.76,4.76,0,0,1,4.56,3.54l0,0.19,0.19,0A5.51,5.51,0,0,1,36.67,7a0.32,0.32,0,0,0,.37.26,14.7,14.7,0,0,1,10.77,5.13,24,24,0,0,1,4.24,6.71l0.23,0.55a42.56,42.56,0,0,1,2.89,12C57.45,54,47.35,81.86,29.23,86.08l-0.11,0-0.06.09A3.78,3.78,0,0,1,28,87.36Z" transform="translate(-0.25 -0.36)"/><path id="Black" class="cls-2" d="M55.43,31.68a49.49,49.49,0,0,0-.86-5.5,39.81,39.81,0,0,0-1.39-4.93,31.29,31.29,0,0,0-2.23-4.93,22.63,22.63,0,0,0-3-4.1A14.94,14.94,0,0,0,37,7H36.94a5.77,5.77,0,0,0-4.16-2.91,4.93,4.93,0,0,0-9.56,0A5.77,5.77,0,0,0,19.06,7H19A14.94,14.94,0,0,0,8,12.23a22.63,22.63,0,0,0-3,4.1,31.29,31.29,0,0,0-2.23,4.93,39.81,39.81,0,0,0-1.39,4.93,49.49,49.49,0,0,0-.86,5.5C-1.73,54.3,8.44,82.1,26.73,86.36A3.17,3.17,0,0,0,28,87.64a3.17,3.17,0,0,0,1.27-1.28C47.56,82.1,57.73,54.3,55.43,31.68ZM28,1.23A3.9,3.9,0,0,1,31.93,4a4.86,4.86,0,0,0-3.86,2.47,0.17,0.17,0,0,1-.07.09,0.15,0.15,0,0,1-.07-0.09A4.86,4.86,0,0,0,24.07,4,3.9,3.9,0,0,1,28,1.23ZM26.14,5.52a3.51,3.51,0,0,1,1.59,2.11A0.46,0.46,0,0,0,28,8a0.46,0.46,0,0,0,.27-0.42,3.51,3.51,0,0,1,1.59-2.11,4.19,4.19,0,0,1,6,1.58,13.38,13.38,0,0,0-1.67.42,6.6,6.6,0,0,0-2.38,1.32,9.4,9.4,0,0,0-3,6.1c-0.67,7.31,7.72,6.16,8.14,6.13,1.08,0,1.9-1.71,1.9-4s-0.84-4-1.9-4c-0.65,0-1.77.52-1.88,2.55C35,17.1,35.7,19,36.6,19.11c0.47,0.06.89-.76,1-1.6s0.06-1.87-.59-2a0.38,0.38,0,0,0-.46.28A3.83,3.83,0,0,1,37,17.1c0,1.25-1.28.63-1.12-1.36C36,14,36.89,14.09,36.93,14.09c0.5,0,1.26,1,1.26,3,0,1.75-.84,3.63-2.46,2.65-1.36-1-1.89-3.28-1.52-5,0.17-.81.87-3,3.13-3,3.26,0,6.3,1.71,8.72,4.9-0.27.85-1.95,4.1-7.28,7.21l-0.29.15a11,11,0,0,0-4.93-1,27.07,27.07,0,0,0-4.64.74,4.09,4.09,0,0,1-.92.15h0a4.09,4.09,0,0,1-.92-0.15A27.07,27.07,0,0,0,22.44,23a11,11,0,0,0-4.93,1l-0.29-.15c-5.34-3.11-7-6.36-7.28-7.21,2.42-3.19,5.46-4.9,8.72-4.9,2.26,0,3,2.21,3.13,3,0.38,1.77-.16,4.05-1.52,5-1.61,1-2.46-.9-2.46-2.65,0-2,.76-3,1.26-3,0,0,.94-0.11,1.09,1.65,0.17,2-1.09,2.61-1.12,1.36a3.83,3.83,0,0,1,.39-1.34A0.38,0.38,0,0,0,19,15.48c-0.65.16-.71,1.3-0.59,2s0.56,1.66,1,1.6c0.9-.12,1.6-2,1.52-3.44-0.1-2-1.23-2.55-1.88-2.55-1.06,0-1.9,1.71-1.9,4s0.82,4,1.9,4c0.42,0,8.81,1.18,8.14-6.13a9.4,9.4,0,0,0-3-6.1,6.6,6.6,0,0,0-2.38-1.32A13.38,13.38,0,0,0,20.1,7.1,4.19,4.19,0,0,1,26.14,5.52ZM10.28,36.18A32.49,32.49,0,0,0,10,39.49a44.42,44.42,0,0,0,2,15.25,49.48,49.48,0,0,0,4.13,9.32A11.48,11.48,0,0,1,11,66.39,66.66,66.66,0,0,1,4.53,34.57,16.13,16.13,0,0,0,10.28,36.18ZM4.56,34c0.44-7.31,2.29-13.05,5-16.87,0.48,1.24,2.57,4.35,7.39,7.18-4.1,2.47-6,7.56-6.58,11.36A15.81,15.81,0,0,1,4.56,34ZM16.41,64.53c3.08,5.3,6.12,8.46,8.45,10.13A11.54,11.54,0,0,1,21.32,79c-4-2.7-7.4-7-10.07-12.13A11.81,11.81,0,0,0,16.41,64.53ZM25.33,75A12.2,12.2,0,0,0,28,76.46,12.2,12.2,0,0,0,30.67,75a12,12,0,0,0,3.53,4.34,18.69,18.69,0,0,1-3.58,1.78s0-.09,0-0.13c-0.26-1.32-2-1.59-2.61-1.59s-2.35.27-2.61,1.59c0,0,0,.09,0,0.13a18.69,18.69,0,0,1-3.58-1.78A12,12,0,0,0,25.33,75Zm5.81-.32c2.33-1.67,5.37-4.83,8.45-10.13a11.81,11.81,0,0,0,5.16,2.36C42.08,72,38.69,76.32,34.68,79A11.54,11.54,0,0,1,31.14,74.66Zm8.72-10.61A49.48,49.48,0,0,0,44,54.73a44.1,44.1,0,0,0,1.66-7.32A44.34,44.34,0,0,0,46,39.49a32.49,32.49,0,0,0-.32-3.31,16.13,16.13,0,0,0,5.75-1.61A66.66,66.66,0,0,1,45,66.39,11.48,11.48,0,0,1,39.86,64.05Zm5.78-28.4c-0.62-3.8-2.5-8.8-6.58-11.36,4.82-2.83,6.92-5.94,7.39-7.18,2.69,3.82,4.55,9.56,5,16.87A15.81,15.81,0,0,1,45.64,35.65ZM25,84.76a23.29,23.29,0,0,1-5.87-2.93,27.5,27.5,0,0,1-3.25-2.62,31.1,31.1,0,0,1-2.35-2.47q-0.76-.88-1.46-1.81a47.49,47.49,0,0,1-5.58-9.69A63.9,63.9,0,0,1,3.09,55,70.46,70.46,0,0,1,1.3,44.19a64.57,64.57,0,0,1-.07-10.84C1.4,31.43,1.63,29.5,2,27.59A39.32,39.32,0,0,1,3.4,22a31,31,0,0,1,2.1-4.86,20.93,20.93,0,0,1,3.15-4.44,16.19,16.19,0,0,1,4-3.1,13.93,13.93,0,0,1,1.93-.87q0.51-.18,1-0.32a8.82,8.82,0,0,1,1-.26,14,14,0,0,1,2.56-.21,7.58,7.58,0,0,1,3.88,1,8,8,0,0,1,3.34,6c0.39,4.52-4.21,5.23-5.11,5.22-0.14,0-.21-0.13.24-0.59a6.53,6.53,0,0,0,1-5.1c-0.44-2.07-1.9-3.69-4-3.69a11.16,11.16,0,0,0-8.12,3.89A22.78,22.78,0,0,0,6,22.61,42.69,42.69,0,0,0,3.76,34,62.43,62.43,0,0,0,4,44.63,68.71,68.71,0,0,0,5.94,55.22a60.82,60.82,0,0,0,3.53,9.85,43.36,43.36,0,0,0,5.48,9A25.89,25.89,0,0,0,23.08,81a18.15,18.15,0,0,0,2.21,1A6.71,6.71,0,0,0,26,85,6.63,6.63,0,0,1,25,84.76Zm3.29,1.55a0.6,0.6,0,0,1-.31.21,0.6,0.6,0,0,1-.31-0.21,6.49,6.49,0,0,1-1.51-5.17c0.12-.64,1.2-0.93,1.82-0.94s1.7,0.3,1.82.94A6.49,6.49,0,0,1,28.31,86.3ZM54.7,44.19A70.46,70.46,0,0,1,52.91,55a63.9,63.9,0,0,1-3.42,10.2,47.49,47.49,0,0,1-5.58,9.69q-0.7.93-1.46,1.81a31.1,31.1,0,0,1-2.35,2.47,27.5,27.5,0,0,1-3.25,2.62A23.29,23.29,0,0,1,31,84.76,6.63,6.63,0,0,1,30,85a6.71,6.71,0,0,0,.67-3.1,18.15,18.15,0,0,0,2.21-1,25.89,25.89,0,0,0,8.13-6.87,43.36,43.36,0,0,0,5.48-9,60.82,60.82,0,0,0,3.53-9.85A68.71,68.71,0,0,0,52,44.63,62.43,62.43,0,0,0,52.24,34,42.69,42.69,0,0,0,50,22.61a22.78,22.78,0,0,0-4.47-7.87,11.16,11.16,0,0,0-8.12-3.89c-2.12,0-3.58,1.62-4,3.69a6.53,6.53,0,0,0,1,5.1c0.45,0.46.38,0.59,0.24,0.59-0.9,0-5.51-.71-5.11-5.22a8,8,0,0,1,3.34-6,7.58,7.58,0,0,1,3.88-1,14,14,0,0,1,2.56.21,8.77,8.77,0,0,1,1,.26q0.52,0.14,1,.32a13.93,13.93,0,0,1,1.93.87,16.19,16.19,0,0,1,4,3.1,20.93,20.93,0,0,1,3.15,4.44A31,31,0,0,1,52.6,22,39.32,39.32,0,0,1,54,27.59c0.35,1.91.58,3.84,0.74,5.77A64.57,64.57,0,0,1,54.7,44.19Z" transform="translate(-0.25 -0.36)"/><path id="Red" class="cls-3" d="M45,39.63c-0.11-2.69-.9-10.9-6.48-14.46A9.41,9.41,0,0,0,34.18,24c-2.74-.18-4.77.87-6.14,0.91H28c-1.37,0-3.42-1.09-6.16-.91a9.35,9.35,0,0,0-4.37,1.21C11.85,28.73,11.07,36.94,11,39.63a43.52,43.52,0,0,0,3.54,19C18.36,67.12,23,73.14,27.63,75.19L28,75.35l0.37-.16c4.61-2,9.27-8.06,13.14-16.57A43.53,43.53,0,0,0,45,39.63Z" transform="translate(-0.25 -0.36)"/><path id="W" class="cls-4" d="M36.3,33.18V35L36.67,35h0.18a1.17,1.17,0,0,1,.82.28,1.27,1.27,0,0,1,.21,1.11s-3.74,16.19-4.45,19.27c-0.82-3.9-5.26-25.18-5.26-25.18l0-.09H27.27v0.1L23.4,55.32,19,36.37a2.7,2.7,0,0,1,0-.28,1.27,1.27,0,0,1,.31-1A1,1,0,0,1,20,34.92l0.37,0v-1.8H14.13v1.76l0.28,0a1.16,1.16,0,0,1,.95.83L23,68.48l0,0.09h1.1v-0.1l3.56-23.3,4.53,23.31,0,0.09h1l7.25-32.78a1,1,0,0,1,1-.75h0.07l0.36,0V33.18H36.3Z" transform="translate(-0.25 -0.36)"/> </svg></a> </div> <div class="uw-title-tagline"> <div id="site-title" class="uw-site-title uw-red-title "> <a href="https://www.physics.wisc.edu/" rel="home">Department of Physics</a> </div> <div id="site-description" class="uw-site-tagline">Research, teaching and outreach in Physics at UW–Madison</div> </div> </div> <div class="uw-header-search"> <form role="search" class="uw-search-form" method="get" id="searchform" action="https://www.physics.wisc.edu/"> <label for="s" class="show-for-sr">Search</label> <input type="text" class="field uw-search-input" name="s" id="s" placeholder="Search" /> <input type="submit" class="submit uw-search-submit uw-button" name="submit" id="searchsubmit" value="Search" /> </form> </div> </div> </header><!-- #branding --> <button class="uw-mobile-menu-button-bar uw-mobile-menu-button-bar-reversed" aria-label="Open menu" aria-expanded="false" aria-controls="uw-top-menus"><span>Menu</span><svg viewBox="0 0 1024 1024" version="1.1" role="img" focusable="false" aria-labelledby="dynid674f1e236e4bb0.30317112"> <title id="dynid674f1e236e4bb0.30317112">open menu</title> <path class="path1" d="M128 256h768v86h-768v-86zM128 554v-84h768v84h-768zM128 768v-86h768v86h-768z"/> </svg><svg viewBox="0 0 805 1024" version="1.1" role="img" focusable="false" aria-labelledby="dynid674f1e236e5266.07024833"> <title id="dynid674f1e236e5266.07024833">close</title> <path class="path1" d="M741.714 755.429q0 22.857-16 38.857l-77.714 77.714q-16 16-38.857 16t-38.857-16l-168-168-168 168q-16 16-38.857 16t-38.857-16l-77.714-77.714q-16-16-16-38.857t16-38.857l168-168-168-168q-16-16-16-38.857t16-38.857l77.714-77.714q16-16 38.857-16t38.857 16l168 168 168-168q16-16 38.857-16t38.857 16l77.714 77.714q16 16 16 38.857t-16 38.857l-168 168 168 168q16 16 16 38.857z"/> </svg></button> <div id="uw-top-menus" class="uw-is-visible uw-horizontal uw-hidden" aria-hidden="false"> <div class="uw-main-nav"> <nav class="uw-nav-menu uw-nav-menu-reverse" aria-label="Main Menu"> <ul id="uw-main-nav" class=""><li id="menu-item-3698" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children uw-dropdown menu-item-3698"><a href="https://www.physics.wisc.edu/graduate/" aria-haspopup="true" aria-expanded="false">Graduate<svg class="uw-caret" viewBox="0 0 1792 1792" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e237eb703.52415618"> <title id="dynid674f1e237eb703.52415618">Expand</title> <path d="M1395 736q0 13-10 23l-466 466q-10 10-23 10t-23-10l-466-466q-10-10-10-23t10-23l50-50q10-10 23-10t23 10l393 393 393-393q10-10 23-10t23 10l50 50q10 10 10 23z"/> </svg><svg class="uw-caret" viewBox="0 0 1792 1792" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e237ebd99.03156446"> <title id="dynid674f1e237ebd99.03156446">Collapse</title> <path d="M1395 1184q0 13-10 23l-50 50q-10 10-23 10t-23-10l-393-393-393 393q-10 10-23 10t-23-10l-50-50q-10-10-10-23t10-23l466-466q10-10 23-10t23 10l466 466q10 10 10 23z"/> </svg></a> <ul aria-hidden="true" aria-label="Graduate submenu" class="sub-menu uw-child-menu"> <li id="menu-item-3701" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-3701"><a href="https://www.physics.wisc.edu/graduate/">Prospective Students</a></li> <li id="menu-item-12558" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12558"><a href="https://www.physics.wisc.edu/graduate/phd-program/">PhD Program</a></li> <li id="menu-item-8556" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-8556"><a href="https://www.physics.wisc.edu/graduate/mspqc-program/">MSPQC Program</a></li> <li id="menu-item-7973" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-7973"><a href="https://www.physics.wisc.edu/courses/">Courses</a></li> <li id="menu-item-7974" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-7974"><a href="https://www.physics.wisc.edu/uw-student-resources/">Student Resources</a></li> <li id="menu-item-7975" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-7975"><a href="https://www.physics.wisc.edu/graduate/phd-program/contacts/">PhD Program Contacts</a></li> <li id="menu-item-7976" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-7976"><a href="https://www.physics.wisc.edu/graduate/mspqc-current-students/mspqc-faculty/">MSPQC Program Contacts</a></li> </ul> </li> <li id="menu-item-3188" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children uw-dropdown menu-item-3188"><a href="https://www.physics.wisc.edu/undergraduate/" aria-haspopup="true" aria-expanded="false">Undergraduate<svg class="uw-caret" viewBox="0 0 1792 1792" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e237ee0e8.87851678"> <title id="dynid674f1e237ee0e8.87851678">Expand</title> <path d="M1395 736q0 13-10 23l-466 466q-10 10-23 10t-23-10l-466-466q-10-10-10-23t10-23l50-50q10-10 23-10t23 10l393 393 393-393q10-10 23-10t23 10l50 50q10 10 10 23z"/> </svg><svg class="uw-caret" viewBox="0 0 1792 1792" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e237ee6f5.55181527"> <title id="dynid674f1e237ee6f5.55181527">Collapse</title> <path d="M1395 1184q0 13-10 23l-50 50q-10 10-23 10t-23-10l-393-393-393 393q-10 10-23 10t-23-10l-50-50q-10-10-10-23t10-23l466-466q10-10 23-10t23 10l466 466q10 10 10 23z"/> </svg></a> <ul aria-hidden="true" aria-label="Undergraduate submenu" class="sub-menu uw-child-menu"> <li id="menu-item-9666" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-9666"><a href="https://www.physics.wisc.edu/undergraduate/">Home</a></li> <li id="menu-item-7981" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-7981"><a href="https://www.physics.wisc.edu/undergraduate/prospective-students/">Prospective Majors</a></li> <li id="menu-item-7982" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-7982"><a href="https://www.physics.wisc.edu/undergraduate/the-physics-major/">Current students</a></li> <li id="menu-item-7985" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-7985"><a href="https://www.physics.wisc.edu/courses/">Courses</a></li> <li id="menu-item-9664" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-9664"><a href="https://www.physics.wisc.edu/undergraduate/certificate-in-physics/">Certificate in Physics</a></li> <li id="menu-item-7983" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-7983"><a href="https://www.physics.wisc.edu/undergraduate/contact-us/">Advising and Course Enrollment Assistance</a></li> <li id="menu-item-7986" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-7986"><a href="https://www.physics.wisc.edu/undergraduate/files/Physics-Declaration-Form.pdf">Major declaration form</a></li> <li id="menu-item-7987" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-7987"><a href="https://www.physics.wisc.edu/undergraduate/files/Independent-Study-Course-Approval-Form-online.pdf">Independent study approval form</a></li> <li id="menu-item-9862" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-9862"><a href="https://visp.wisc.edu/thematic-physics/">Visiting Scholars (VISP)</a></li> </ul> </li> <li id="menu-item-6319" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6319"><a href="https://www.physics.wisc.edu/research/">Research</a></li> <li id="menu-item-2923" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children uw-dropdown menu-item-2923"><a href="https://www.physics.wisc.edu/people/" aria-haspopup="true" aria-expanded="false">People<svg class="uw-caret" viewBox="0 0 1792 1792" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e237f09e9.89426711"> <title id="dynid674f1e237f09e9.89426711">Expand</title> <path d="M1395 736q0 13-10 23l-466 466q-10 10-23 10t-23-10l-466-466q-10-10-10-23t10-23l50-50q10-10 23-10t23 10l393 393 393-393q10-10 23-10t23 10l50 50q10 10 10 23z"/> </svg><svg class="uw-caret" viewBox="0 0 1792 1792" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e237f0f64.72517914"> <title id="dynid674f1e237f0f64.72517914">Collapse</title> <path d="M1395 1184q0 13-10 23l-50 50q-10 10-23 10t-23-10l-393-393-393 393q-10 10-23 10t-23-10l-50-50q-10-10-10-23t10-23l466-466q10-10 23-10t23 10l466 466q10 10 10 23z"/> </svg></a> <ul aria-hidden="true" aria-label="People submenu" class="sub-menu uw-child-menu"> <li id="menu-item-3052" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-3052"><a href="https://www.physics.wisc.edu/people/faculty/">Faculty</a></li> <li id="menu-item-3056" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-3056"><a href="https://www.physics.wisc.edu/people/visitors/">Visiting Faculty and Researchers</a></li> <li id="menu-item-3057" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-3057"><a href="https://www.physics.wisc.edu/people/department/">Department Staff</a></li> <li id="menu-item-3058" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-3058"><a href="https://www.physics.wisc.edu/people/research-staff/">Research Staff</a></li> <li id="menu-item-3059" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-3059"><a href="https://www.physics.wisc.edu/people/phd-students/">PhD Students</a></li> <li id="menu-item-3627" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-3627"><a href="https://www.physics.wisc.edu/people/mspqc-students/">MSPQC Students</a></li> <li id="menu-item-3053" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-3053"><a href="https://www.physics.wisc.edu/people/emeritus-faculty/">Emeritus Faculty</a></li> <li id="menu-item-3061" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-3061"><a href="https://www.physics.wisc.edu/people/board-of-visitors/">Board of Visitors</a></li> <li id="menu-item-12265" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12265"><a href="https://www.physics.wisc.edu/people/search/">Search for People</a></li> </ul> </li> <li id="menu-item-7957" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children uw-dropdown menu-item-7957"><a href="https://www.physics.wisc.edu/news/" aria-haspopup="true" aria-expanded="false">News & Events<svg class="uw-caret" viewBox="0 0 1792 1792" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e237f34a3.41407937"> <title id="dynid674f1e237f34a3.41407937">Expand</title> <path d="M1395 736q0 13-10 23l-466 466q-10 10-23 10t-23-10l-466-466q-10-10-10-23t10-23l50-50q10-10 23-10t23 10l393 393 393-393q10-10 23-10t23 10l50 50q10 10 10 23z"/> </svg><svg class="uw-caret" viewBox="0 0 1792 1792" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e237f3a21.05814824"> <title id="dynid674f1e237f3a21.05814824">Collapse</title> <path d="M1395 1184q0 13-10 23l-50 50q-10 10-23 10t-23-10l-393-393-393 393q-10 10-23 10t-23-10l-50-50q-10-10-10-23t10-23l466-466q10-10 23-10t23 10l466 466q10 10 10 23z"/> </svg></a> <ul aria-hidden="true" aria-label="News & Events submenu" class="sub-menu uw-child-menu"> <li id="menu-item-7959" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-7959"><a href="https://www.physics.wisc.edu/events/">Events</a></li> <li id="menu-item-7958" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-7958"><a href="https://www.physics.wisc.edu/news/">Department News</a></li> <li id="menu-item-7960" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-7960"><a href="https://www.physics.wisc.edu/department/alumni-friends/">The Wisconsin Physicist</a></li> <li id="menu-item-7961" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-7961"><a href="https://explore.wisc.edu/physics-subscriptions">Subscribe to e-newsletter</a></li> </ul> </li> <li id="menu-item-5126" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-5126"><a href="https://www.physics.wisc.edu/department/climate-diversity/">Climate & Diversity</a></li> <li id="menu-item-6209" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6209"><a href="https://www.physics.wisc.edu/outreach/">Outreach</a></li> <li id="menu-item-7964" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-home menu-item-has-children uw-dropdown menu-item-7964"><a href="https://www.physics.wisc.edu/" aria-haspopup="true" aria-expanded="false">Resources<svg class="uw-caret" viewBox="0 0 1792 1792" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e237f5550.11486081"> <title id="dynid674f1e237f5550.11486081">Expand</title> <path d="M1395 736q0 13-10 23l-466 466q-10 10-23 10t-23-10l-466-466q-10-10-10-23t10-23l50-50q10-10 23-10t23 10l393 393 393-393q10-10 23-10t23 10l50 50q10 10 10 23z"/> </svg><svg class="uw-caret" viewBox="0 0 1792 1792" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e237f5c64.45949037"> <title id="dynid674f1e237f5c64.45949037">Collapse</title> <path d="M1395 1184q0 13-10 23l-50 50q-10 10-23 10t-23-10l-393-393-393 393q-10 10-23 10t-23-10l-50-50q-10-10-10-23t10-23l466-466q10-10 23-10t23 10l466 466q10 10 10 23z"/> </svg></a> <ul aria-hidden="true" aria-label="Resources submenu" class="sub-menu uw-child-menu"> <li id="menu-item-7965" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-7965"><a href="https://www.physics.wisc.edu/department/">Department Resources</a></li> <li id="menu-item-7990" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-7990"><a href="https://www.physics.wisc.edu/uw-student-resources/">Student Resources</a></li> </ul> </li> <li id="menu-item-7968" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-7968"><a href="https://www.physics.wisc.edu/giving/">Giving</a></li> </ul> </nav> </div> <div class="uw-secondary-nav"> <nav class="uw-nav-menu uw-nav-menu-secondary" aria-label="Secondary Menu"> <ul id="uw-secondary-nav" class="utility-menu"><li id="menu-item-1411" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-1411"><a href="https://www.physics.wisc.edu/department/contact/">Contact</a></li> <li id="menu-item-4302" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-4302"><a href="https://www.physics.wisc.edu/courses/">Courses</a></li> <li id="menu-item-3726" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-3726"><a href="https://www.physics.wisc.edu/department/employment/">Jobs</a></li> <li id="menu-item-7971" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-7971"><a href="https://www.physics.wisc.edu/department/visit/">Visit</a></li> <a href="https://www.physics.wisc.edu/wp-login.php?redirect_to=%2Fcategory%2Fparticle-physics%2F&action=shibboleth">Log in</a></ul> </nav> </div> </div> <nav class="breadcrumb-nav" aria-label="Breadcrumb"> <ol itemscope itemtype="http://schema.org/BreadcrumbList" id="breadcrumbs" class="breadcrumb-nav__list breadcrumbs"> <li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem" class="breadcrumb-nav__item item-home"> <a itemprop="item" href="https://www.physics.wisc.edu/" class="breadcrumb-nav__link bread-link bread-home" title="Home" > <span itemprop="name">Home</span> <meta itemprop="position" content="1"> </a> </li> <li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem" class="breadcrumb-nav__item item-current item-89"> <a itemprop="item" href="https://www.physics.wisc.edu/category/particle-physics/" class="breadcrumb-nav__link bread-current bread-89" title="particle physics" aria-current="page"> <span itemprop="name">particle physics</span> <meta itemprop="position" content="2"> </a> </li> </ol> </nav> <div id="page" class="content"> <main id="main" class="site-main" role="main"> <header class="page-header"> <h1 class="page-title uw-mini-bar">particle physics</h1> </header> <article id="post-12386" class="post-12386 post type-post status-publish format-standard has-post-thumbnail hentry category-astrophysics category-particle-physics category-research category-wipac"> <header> <h1 class="page-title uw-mini-bar">HAWC detection of an ultra-high-energy gamma-ray bubble around a microquasar</h1> <div></div> </header> <div class="entry-content"> <p>This story is adapted from the HAWC Collaboration press release. Microquasars—compact regions surrounding a black hole with a mass several times that of its companion star—have long been recognized as powerful particle accelerators within our galaxy. The enormous jets spewing out of microquasars are thought to play an important role in the production of galactic cosmic rays, although [...]</p> Read the full article at: <a href="https://wipac.wisc.edu/hawc-detection-of-an-ultra-high-energy-gamma-ray-bubble-around-a-microquasar/" target="_blank"> https://wipac.wisc.edu/hawc-detection-of-an-ultra-high-energy-gamma-ray-bubble-around-a-microquasar/ </a> </div> <footer class="entry-footer"> <span class="cat-links">Posted in <a href="https://www.physics.wisc.edu/category/astrophysics/" rel="category tag">Astrophysics</a>, <a href="https://www.physics.wisc.edu/category/particle-physics/" rel="category tag">particle physics</a>, <a href="https://www.physics.wisc.edu/category/research/" rel="category tag">Research</a>, <a href="https://www.physics.wisc.edu/category/wipac/" rel="category tag">WIPAC</a></span> </footer> </article> <article id="post-11577" class="post-11577 post type-post status-publish format-standard has-post-thumbnail hentry category-high-energy category-particle-physics tag-fermilab tag-neutrinos tag-nova"> <header class="entry-header"> <h1 class="page-title uw-mini-bar">New NOvA results add to mystery of neutrinos</h1> <div class="entry-meta"> <span class="posted-on">Posted on <a href="https://www.physics.wisc.edu/2024/06/18/new-nova-results-add-to-mystery-of-neutrinos/" rel="bookmark"><time class="entry-date published updated" datetime="2024-06-18T10:29:32-05:00">June 18, 2024</time></a></span> </div><!-- .entry-meta --> </header> <div class="entry-content"> <p>The international <a href="https://news.fnal.gov/2024/06/new-nova-results-add-to-mystery-of-neutrinos/">NOvA collaboration presented new results</a> at the Neutrino 2024 conference in Milan, Italy, on June 17. The collaboration doubled their neutrino data since their <a href="https://news.fnal.gov/2021/09/new-results-from-nova-experiment-shed-more-light-on-neutrinos-identity-changing-behavior/">previous release</a> four years ago, including adding a new low-energy sample of electron neutrinos. The new results are consistent with previous NOvA results, but with improved precision. The data favor the “normal” ordering of neutrino masses more strongly than before, but ambiguity remains around the neutrino’s oscillation properties.</p> <p>At UW–Madison, the NOvA collaboration includes physics professor Brian Rebel, postdoc Adam Lister, former postdoc Tom Carroll, and grad student Anna Cooleybeck.</p> <p>The latest NOvA data provide a very precise measurement of the bigger splitting between the squared neutrino masses and slightly favor the normal mass ordering. That precision on the mass splitting means that, when coupled with data from other experiments performed at nuclear reactors, the data favor the normal ordering at almost 7:1 odds. This suggests that neutrinos adhere to the normal ordering, but physicists have not met the high threshold of certainty required to declare a discovery.</p> <p style="text-align: center"><a class="uw-button uw-button-red" href="https://news.fnal.gov/2024/06/new-nova-results-add-to-mystery-of-neutrinos/">Read the full story, originally published by Fermilab</a></p> </div> <footer class="entry-footer"> <span class="cat-links">Posted in <a href="https://www.physics.wisc.edu/category/high-energy/" rel="category tag">High Energy</a>, <a href="https://www.physics.wisc.edu/category/particle-physics/" rel="category tag">particle physics</a></span><span class="tags-links">Tagged <a href="https://www.physics.wisc.edu/tag/fermilab/" rel="tag">Fermilab</a>, <a href="https://www.physics.wisc.edu/tag/neutrinos/" rel="tag">neutrinos</a>, <a href="https://www.physics.wisc.edu/tag/nova/" rel="tag">NOvA</a></span> </footer> </article> <article id="post-11551" class="post-11551 post type-post status-publish format-standard has-post-thumbnail hentry category-astrophysics category-nuclear-physics category-particle-physics category-quantum-science tag-entanglement tag-i-process tag-neutrinos tag-neutron-capture tag-nucleosynthesis tag-standard-model"> <header class="entry-header"> <h1 class="page-title uw-mini-bar">Entangled neutrinos may lead to heavier element formation</h1> <div class="entry-meta"> <span class="posted-on">Posted on <a href="https://www.physics.wisc.edu/2024/06/06/entangled-neutrinos-may-lead-to-heavier-element-formation/" rel="bookmark"><time class="entry-date published updated" datetime="2024-06-06T16:05:27-05:00">June 6, 2024</time></a></span> </div><!-- .entry-meta --> </header> <div class="entry-content"> <p>Elements are the building blocks of every chemical in the universe, but how and where the different elements formed is not entirely understood. A new paper in <a href="https://iopscience.iop.org/article/10.3847/1538-4357/ad393d">The Astrophysical Journal</a> by University of Wisconsin–Madison physics professor <a href="https://www.physics.wisc.edu/directory/balantekin-a-b/">Baha Balantekin</a> and colleagues with the <a href="https://n3as.berkeley.edu/">Network for Neutrinos, Nuclear Astrophysics, and Symmetries</a> (N3AS) Physics Frontier Center, shows how entangled neutrinos could be required for the formation of elements above approximately atomic number 140 via neutron capture in an intermediate-rate process, or i-process.</p> <figure id="attachment_6863" class="wp-caption alignleft" style="max-width: 300px;" aria-label="Baha Balantekin"><a href="https://www.physics.wisc.edu/wp-content/uploads/2022/05/20220506_Banquet_009-scaled-e1652203155678.jpg"><img fetchpriority="high" decoding="async" class="wp-image-6863 size-medium" src="https://www.physics.wisc.edu/wp-content/uploads/2022/05/20220506_Banquet_009-scaled-e1652203155678-300x300.jpg" alt="Profile photo of Baha Balantekin" width="300" height="300" srcset="https://www.physics.wisc.edu/wp-content/uploads/2022/05/20220506_Banquet_009-scaled-e1652203155678-300x300.jpg 300w, https://www.physics.wisc.edu/wp-content/uploads/2022/05/20220506_Banquet_009-scaled-e1652203155678-1024x1024.jpg 1024w, https://www.physics.wisc.edu/wp-content/uploads/2022/05/20220506_Banquet_009-scaled-e1652203155678-150x150.jpg 150w, https://www.physics.wisc.edu/wp-content/uploads/2022/05/20220506_Banquet_009-scaled-e1652203155678-768x768.jpg 768w, https://www.physics.wisc.edu/wp-content/uploads/2022/05/20220506_Banquet_009-scaled-e1652203155678-1200x1200.jpg 1200w, https://www.physics.wisc.edu/wp-content/uploads/2022/05/20220506_Banquet_009-scaled-e1652203155678-400x400.jpg 400w, https://www.physics.wisc.edu/wp-content/uploads/2022/05/20220506_Banquet_009-scaled-e1652203155678.jpg 1401w" sizes="(max-width: 300px) 100vw, 300px" /></a><figcaption class="wp-caption-text">Baha Balantekin</figcaption></figure> <p><em>Why it’s important</em></p> <p>“Where the chemical elements are made is not clear, and we do not know all the possible ways they can be made,” Balantekin says. “We believe that some are made in supernovae explosions or neutron star mergers, and many of these objects are governed by the laws of quantum mechanics, so then you can use the stars to explore aspects of quantum mechanics.”</p> <p><em>What is already known? </em></p> <ul> <li>Immediately after the Big Bang, lighter elements like hydrogen and helium were abundant. Heavier elements, up to iron (atomic number 26) continued to form through nuclear fusion in the centers of hot stars.</li> <li>Above iron, fusion is no longer energetically favorable, and nuclear synthesis occurs via neutron capture, where neutrons glom onto atomic nuclei. At high enough concentrations, neutrons can convert into protons, increasing the atomic number of the element by one.</li> <li>This conversion is dependent on neutrinos and antineutrinos. Neutron capture has been found to occur slowly (s-process, over years) and rapidly (r-process, within minutes); an intermediate timescale, or i-process has been proposed but little evidence exists to support it. Rapid or intermediate neutron capture can only take place in catastrophic events where a huge amount of energy is released, such as supernova collapse.</li> <li>“When a supernova collapse occurs, you start with a big star, which is gravitationally bound, and that binding has energy,” Balantekin says. “When it collapses, that energy has to be released, and it turns out that energy is released in neutrinos.”</li> <li>The laws of quantum mechanics state that those neutrinos can become entangled because they interact in the collapsing supernova. Entanglement is when any two or more particles interacted and then “remember” the others, no matter how far apart they might be.</li> </ul> <p><em>A quick summary of the research</em></p> <ul> <li>“One question we can ask is if these neutrinos are entangled with each other or not,” Balantekin says. “This paper shows that if the neutrinos are entangled, then there is an enhanced new process of element production, the i-process.”</li> </ul> <figure id="attachment_11552" class="wp-caption aligncenter" style="max-width: 640px;" aria-label="The abundance pattern based on calculations in this paper (ν i-process pattern; purple line), compared with the solar system s-process (gray line) and r-process (black line) abundance data (Sneden et al. 2008). The ν i abundance for A = 143 is scaled to the solar r-process data for pattern comparison. | Source: The Astrophysical Journal"><a href="https://www.physics.wisc.edu/wp-content/uploads/2024/06/i-process-APJ-figure-13-entangled-neutrinos.jpeg"><img decoding="async" class="size-large wp-image-11552" src="https://www.physics.wisc.edu/wp-content/uploads/2024/06/i-process-APJ-figure-13-entangled-neutrinos-1024x746.jpeg" alt="a plot of mass number A (atomic number) on the x-axis and abundance as a log scale on the y-axis. a purple line shows the i-process abundance, black line shows r-process, and grey line shows s-process. Above atomic number 140 or so, there is a visible enhancement of the purple line over the other two lines (below 140 the black and grey lines are much higher abundance values than the purple line)" width="640" height="466" srcset="https://www.physics.wisc.edu/wp-content/uploads/2024/06/i-process-APJ-figure-13-entangled-neutrinos-1024x746.jpeg 1024w, https://www.physics.wisc.edu/wp-content/uploads/2024/06/i-process-APJ-figure-13-entangled-neutrinos-300x219.jpeg 300w, https://www.physics.wisc.edu/wp-content/uploads/2024/06/i-process-APJ-figure-13-entangled-neutrinos-768x560.jpeg 768w, https://www.physics.wisc.edu/wp-content/uploads/2024/06/i-process-APJ-figure-13-entangled-neutrinos-1200x874.jpeg 1200w, https://www.physics.wisc.edu/wp-content/uploads/2024/06/i-process-APJ-figure-13-entangled-neutrinos.jpeg 1500w" sizes="(max-width: 640px) 100vw, 640px" /></a><figcaption class="wp-caption-text">The abundance pattern based on calculations in this paper (ν i-process pattern; purple line), compared with the solar system s-process (gray line) and r-process (black line) abundance data (Sneden et al. 2008). The ν i abundance for A = 143 is scaled to the solar r-process data for pattern comparison. | Source: The Astrophysical Journal</figcaption></figure> <p><em>The experimental and simulated evidence</em></p> <ul> <li>The researchers used two known facts to set up their calculations: well-established rates of neutron capture, and catalogs of the atomic spectra of stars, which astronomers have collected over decades to identify the abundance of different elements. They also knew that a supernova collapse produces on the order of 10^58 neutrinos, a number that is far too large to use in any standard calculations.</li> <li>Instead, they made simulations of up to eight neutrinos and calculated the abundance of elements that would be created via neutron capture if the neutrinos were entangled, or were not entangled.</li> <li>“We have a system of, say, three neutrinos and three antineutrinos together in a region where there are protons and neutrons and see if that changes anything about element formation,” Balantekin says. “We calculate the abundances of elements that are produced in the star, and you see that the entangled or not entangled cases give you different abundances.”</li> <li>The simulations showed that elements with atomic number greater than 140 are likely to be enhanced by i-process neutron capture — but only if the neutrinos are entangled.</li> </ul> <p><em>Caveats and future work</em></p> <ul> <li>Balantekin points out that these simulations are just “hints” based on astronomical observations. Astrophysics research requires using the cosmos as a lab, and it is difficult to conduct true experimental tests on earth.</li> <li>“There’s something called the standard model of particle physics, which determines the interaction of particles. The neutrino-neutrino interaction is one aspect of the standard model which has not been tested in the lab, it can only be tested in astrophysical extremes,” Balantekin says. “But other aspects of the standard model have been tested in the lab, so one believes that it should all work.”</li> <li>The researchers are currently using more astrophysical data of element abundance in extreme environments to see if those abundances continue to be explained by entangled neutrinos.</li> </ul> <p><em>This research is supported in part by the National Science Foundation grants Nos. PHY-1630782 and PHY-2020275 (Network for Neutrinos, Nuclear Astrophysics and Symmetries). Balantekin is supported in part by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Award No. DE-SC0019465 and in part by the National Science Foundation Grant PHY-2108339 at the University of Wisconsin-Madison. </em></p> <p><em>The paper’s co-authors include Michael Cervia, Amol Patwardhan, Rebecca Surman, and Xilu Wang, all current or former members of N3AS.</em></p> </div> <footer class="entry-footer"> <span class="cat-links">Posted in <a href="https://www.physics.wisc.edu/category/astrophysics/" rel="category tag">Astrophysics</a>, <a href="https://www.physics.wisc.edu/category/nuclear-physics/" rel="category tag">nuclear physics</a>, <a href="https://www.physics.wisc.edu/category/particle-physics/" rel="category tag">particle physics</a>, <a href="https://www.physics.wisc.edu/category/quantum-science/" rel="category tag">Quantum Science</a></span><span class="tags-links">Tagged <a href="https://www.physics.wisc.edu/tag/entanglement/" rel="tag">entanglement</a>, <a href="https://www.physics.wisc.edu/tag/i-process/" rel="tag">i process</a>, <a href="https://www.physics.wisc.edu/tag/neutrinos/" rel="tag">neutrinos</a>, <a href="https://www.physics.wisc.edu/tag/neutron-capture/" rel="tag">neutron capture</a>, <a href="https://www.physics.wisc.edu/tag/nucleosynthesis/" rel="tag">nucleosynthesis</a>, <a href="https://www.physics.wisc.edu/tag/standard-model/" rel="tag">standard model</a></span> </footer> </article> <article id="post-11401" class="post-11401 post type-post status-publish format-standard has-post-thumbnail hentry category-awards-and-honors category-particle-physics category-wipac tag-bernice-durand tag-bov tag-faculty-fellowship tag-icecube"> <header class="entry-header"> <h1 class="page-title uw-mini-bar">Ke Fang named inaugural recipient of the Bernice Durand Faculty Fellowship</h1> <div class="entry-meta"> <span class="posted-on">Posted on <a href="https://www.physics.wisc.edu/2024/05/08/fang-durand-fellowship/" rel="bookmark"><time class="entry-date published updated" datetime="2024-05-08T10:01:04-05:00">May 8, 2024</time></a></span> </div><!-- .entry-meta --> </header> <div class="entry-content"> <p>The Department of Physics is pleased to announce that Ke Fang, assistant professor of physics and <a href="https://wipac.wisc.edu/">WIPAC</a> investigator, has received the inaugural Bernice Durand Faculty Fellowship. This fellowship, given in honor of late Professor Emerit of Physics Bernice Durand, recognizes Fang’s major contributions to the analysis of data from the NASA Fermi satellite, the High Altitude Water Cherenkov (HAWC) telescope and IceCube, and for fundamental theoretical insights in their multimessenger context. Fang is a <a href="https://www.physics.wisc.edu/2024/02/20/ke-fang-named-sloan-fellow/">Sloan Fellow</a>, has been awarded an <a href="https://www.physics.wisc.edu/2023/05/04/ke-fang-earns-nsf-career-award/">NSF CAREER award</a>, and is the spokesperson for the <a href="https://www.hawc-observatory.org/">HAWC experiment</a>.</p> <figure id="attachment_11402" class="wp-caption aligncenter" style="max-width: 640px;" aria-label="Department Chair and professor Mark Eriksson (left) presents assistant professor Ke Fang with the Bernice Durand Faculty Fellowship at the department awards banquet in May 2024."><a href="https://www.physics.wisc.edu/wp-content/uploads/2024/05/20240503_090-scaled.jpg"><img decoding="async" class="size-large wp-image-11402" src="https://www.physics.wisc.edu/wp-content/uploads/2024/05/20240503_090-1024x683.jpg" alt="a man and a woman smile while both holding a framed award certificate" width="640" height="427" srcset="https://www.physics.wisc.edu/wp-content/uploads/2024/05/20240503_090-1024x683.jpg 1024w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/20240503_090-300x200.jpg 300w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/20240503_090-768x512.jpg 768w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/20240503_090-1536x1024.jpg 1536w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/20240503_090-2048x1365.jpg 2048w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/20240503_090-1200x800.jpg 1200w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/20240503_090-600x400.jpg 600w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/20240503_090-900x600.jpg 900w" sizes="(max-width: 640px) 100vw, 640px" /></a><figcaption class="wp-caption-text">Department Chair and professor Mark Eriksson (left) presents assistant professor Ke Fang with the Bernice Durand Faculty Fellowship at the department awards banquet in May 2024.</figcaption></figure> <p>Durand was one of the first two women professors in the UW–Madison Department of Physics. While at UW–Madison, Durand was a theoretical physicist who specialized in particle theory and mathematical physics. Her research was on symmetry relations in algebra and physics, plus the phenomenology of high-energy interactions at large particle accelerators.</p> <p>As the first Associate Vice Chancellor for Diversity & Climate, Professor Durand provided leadership to ensure that faculty, staff, and student diversity issues including race, ethnicity, gender, sexual preference, and classroom and general campus workplace climate issues be addressed, and that search committees for non-classified staff be trained in broadening the pool of applicants and eliminating implicit bias. Durand co-directed a grant from the Alfred P. Sloan Foundation to the UW System designed to create more equity, flexibility and career options for faculty and academic staff. She was also a member of the leadership team of the Women in Science and Engineering Leadership Institute sponsored by the National Science Foundation to increase the participation and status of women in science.</p> <p>A recipient of the Chancellor’s Award for Outstanding Teaching, Professor Durand taught courses at all levels, from modern physics for non-scientists (“Physics for Poets”) to a specialized course she developed for advanced graduate students in the use of topology and algebra in quantum field theory. In the mid 1990s, she used technological and pedagogical techniques in her teaching, such as broadcasting her modern physics for non-scientists course on public television with web-based coursework, and pioneering one of two early versions of MOOCs (massive open online courses) on campus.</p> <p>Durand <a href="https://www.physics.wisc.edu/2022/02/22/theoretical-physicist-bernice-durand-was-a-leader-of-gender-equity-on-campus-and-in-her-field/">passed away in 2022</a>.</p> <p>The Bernice Durand Faculty Fellowship was conceived by our <a href="https://www.physics.wisc.edu/people/board-of-visitors/">Board of Visitors</a>, who spearheaded the ultimately-successful fundraising effort, with support from Professor Emerit Randy Durand for this fellowship honoring his wife.</p> </div> <footer class="entry-footer"> <span class="cat-links">Posted in <a href="https://www.physics.wisc.edu/category/awards-and-honors/" rel="category tag">Awards and Honors</a>, <a href="https://www.physics.wisc.edu/category/particle-physics/" rel="category tag">particle physics</a>, <a href="https://www.physics.wisc.edu/category/wipac/" rel="category tag">WIPAC</a></span><span class="tags-links">Tagged <a href="https://www.physics.wisc.edu/tag/bernice-durand/" rel="tag">Bernice Durand</a>, <a href="https://www.physics.wisc.edu/tag/bov/" rel="tag">BOV</a>, <a href="https://www.physics.wisc.edu/tag/faculty-fellowship/" rel="tag">faculty fellowship</a>, <a href="https://www.physics.wisc.edu/tag/icecube/" rel="tag">IceCube</a></span> </footer> </article> <article id="post-11387" class="post-11387 post type-post status-publish format-standard has-post-thumbnail hentry category-awards-and-honors category-high-energy category-particle-physics category-undergraduate tag-aps tag-aps-april-meeting"> <header class="entry-header"> <h1 class="page-title uw-mini-bar">Two physics students win presentation awards at APS April Meeting</h1> <div class="entry-meta"> <span class="posted-on">Posted on <a href="https://www.physics.wisc.edu/2024/05/06/two-physics-students-win-presentation-awards-at-aps-april-meeting/" rel="bookmark"><time class="entry-date published updated" datetime="2024-05-06T11:18:57-05:00">May 6, 2024</time></a></span> </div><!-- .entry-meta --> </header> <div class="entry-content"> <p>Elias Mettner and Nadia Talbi, both conducting research in <a href="https://www.hep.wisc.edu/">high energy physics</a> at UW–Madison, won undergraduate presenter awards at the American Physical Society’s April Meeting.</p> <p><a href="https://april.aps.org/">The meeting</a>, held in Sacramento April 3-6, included seven undergraduate oral presentation sessions with six to eight students in each session. The top two students from each session earned “Top Presenter” awards. Mettner and Talbi were the only two UW–Madison students who gave oral presentations, and both won awards.</p> <figure id="attachment_11394" class="wp-caption alignleft" style="max-width: 300px;" aria-label="Elias Mettner"><a href="https://www.physics.wisc.edu/wp-content/uploads/2024/05/Mettner-scaled.jpeg"><img loading="lazy" decoding="async" class="size-medium wp-image-11394" src="https://www.physics.wisc.edu/wp-content/uploads/2024/05/Mettner-300x300.jpeg" alt="profile photo of Elias Mettner" width="300" height="300" srcset="https://www.physics.wisc.edu/wp-content/uploads/2024/05/Mettner-300x300.jpeg 300w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/Mettner-1024x1024.jpeg 1024w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/Mettner-150x150.jpeg 150w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/Mettner-768x768.jpeg 768w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/Mettner-1536x1536.jpeg 1536w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/Mettner-2048x2048.jpeg 2048w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/Mettner-1200x1200.jpeg 1200w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/Mettner-400x400.jpeg 400w" sizes="auto, (max-width: 300px) 100vw, 300px" /></a><figcaption class="wp-caption-text">Elias Mettner</figcaption></figure> <p>Mettner is a physics major working with scientist Abdollah Mohammadi. His talk was titled “Pair Production and Hadron Photoproduction Backgrounds at the Cool Copper Collider.”</p> <p>The Cool Copper Collider is a proposed electron-positron collider that will help scientists to explore the Higgs boson even further. The electron-positron beam will have some natural decay that converts into particles and is recorded by the detector. Mettner’s research asks how this beam background will impact the detector.</p> <p>“The detector will record this background, and it could take the place of the data we want or make it harder to reconstruct data,” Mettner says. “It’s important to make sure that the backgrounds that will come into the detector using this new design will not cause any issues, otherwise the benefits of this collider design cannot be put to their maximum use.”</p> <p>Mettner had been interested in physics from a young age and comes from a family of teachers who encouraged him to explore his academic interests. Upon entering UW–Madison, he jumped at the chance to conduct research in particle physics. He joined the UW CMS Collaboration in his freshman year through the <a href="https://urs.ls.wisc.edu/">Undergraduate Research Scholars</a> program and began his project with the Cool Copper Collider soon after. He was also awarded the Sophomore Research Fellowship for his junior year and the Hilldale Research Fellowship for his upcoming senior year.</p> <figure id="attachment_11389" class="wp-caption alignright" style="max-width: 450px;" aria-label="Nadia Talbi presents at APS April Meeting"><a href="https://www.physics.wisc.edu/wp-content/uploads/2024/05/Nadia-Talbi-at-APS.jpg"><img loading="lazy" decoding="async" class="wp-image-11389" src="https://www.physics.wisc.edu/wp-content/uploads/2024/05/Nadia-Talbi-at-APS-300x225.jpg" alt="a woman stands in front of a screen with a powerpoint presentation title slide showing" width="450" height="338" srcset="https://www.physics.wisc.edu/wp-content/uploads/2024/05/Nadia-Talbi-at-APS-300x225.jpg 300w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/Nadia-Talbi-at-APS-1024x768.jpg 1024w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/Nadia-Talbi-at-APS-768x576.jpg 768w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/Nadia-Talbi-at-APS-1536x1153.jpg 1536w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/Nadia-Talbi-at-APS-2048x1537.jpg 2048w, https://www.physics.wisc.edu/wp-content/uploads/2024/05/Nadia-Talbi-at-APS-1200x900.jpg 1200w" sizes="auto, (max-width: 450px) 100vw, 450px" /></a><figcaption class="wp-caption-text">Nadia Talbi presents at APS April Meeting</figcaption></figure> <p>Talbi is an astronomy-physics major working in physics professor <a href="https://www.physics.wisc.edu/directory/bose-tulika/">Tulika Bose</a>’s group and mentored by postdoc Charis Koraka. Her talk, “A Search for Vector-Like Leptons: Compact Analysis,” covered work she has done through a Thaxton Fellowship.</p> <p>“Bosons are force particles, and basically every boson except for the Higgs — the photon, the gluon — is a vector boson. Leptons are electrons, muons, neutrinos, stuff like that,” Talbi explains. “Vector-like leptons are a hypothetical particle, we don’t know whether or not they exist.”</p> <p>Talbi was drawn to astronomy because she has long had an interest in the fundamental nature of the universe. As a child, she read an article on Dark Matter and, later, a friend gave her a book on the Standard Model. She was hooked. When she applied for the <a href="https://www.physics.wisc.edu/undergraduate/student-resources/hubert-mack-thaxton-fellowship/">Thaxton Fellowship</a>, a departmental program that was started to provide more equitable access to undergraduate research in physics, she discussed her interest in particle physics and the research at CERN, which landed her in Bose’s group.</p> <p>“So before I even had any formal education in physics, where things can be very black and white, I’ve had the opportunity to understand the beautiful things within the field,” Talbi says. “Studying physics, I think, gives you some of the most fundamental understanding of our existence.”</p> <p>Both Metter and Talbi say that attending conference was overall a very worthwhile experience — even if they both had to take an E+M exam remotely before presenting. (“It was a good bonding experience,” Talbi says.)</p> <p>“The conference was a lot of fun, and worth it to go and make some connections and experience a bunch of really interesting research from people all in different stages of their careers,” Mettner says.</p> <p>Adds Talbi: “There were so many undergraduates there, I met so many, I made a lot of friends. It felt like there was a community.”</p> <p>Both students were also invited to present their award-winning talks to the Physics Board of Visitors spring meeting.</p> </div> <footer class="entry-footer"> <span class="cat-links">Posted in <a href="https://www.physics.wisc.edu/category/awards-and-honors/" rel="category tag">Awards and Honors</a>, <a href="https://www.physics.wisc.edu/category/high-energy/" rel="category tag">High Energy</a>, <a href="https://www.physics.wisc.edu/category/particle-physics/" rel="category tag">particle physics</a>, <a href="https://www.physics.wisc.edu/category/undergraduate/" rel="category tag">Undergraduate</a></span><span class="tags-links">Tagged <a href="https://www.physics.wisc.edu/tag/aps/" rel="tag">APS</a>, <a href="https://www.physics.wisc.edu/tag/aps-april-meeting/" rel="tag">APS April Meeting</a></span> </footer> </article> <article id="post-11379" class="post-11379 post type-post status-publish format-standard has-post-thumbnail hentry category-awards-and-honors category-high-energy category-particle-physics category-phenomenology category-wipac"> <header> <h1 class="page-title uw-mini-bar">UW–Madison physicist Francis Halzen elected to National Academy of Sciences </h1> <div></div> </header> <div class="entry-content"> <p>Halzen directs the UW–Madison Institute for Elementary Particle Physics Research and is the principal investigator of the IceCube Neutrino Observatory.</p> Read the full article at: <a href="https://news.wisc.edu/uw-madison-physicist-francis-halzen-elected-to-national-academy-of-sciences/" target="_blank"> https://news.wisc.edu/uw-madison-physicist-francis-halzen-elected-to-national-academy-of-sciences/ </a> </div> <footer class="entry-footer"> <span class="cat-links">Posted in <a href="https://www.physics.wisc.edu/category/awards-and-honors/" rel="category tag">Awards and Honors</a>, <a href="https://www.physics.wisc.edu/category/high-energy/" rel="category tag">High Energy</a>, <a href="https://www.physics.wisc.edu/category/particle-physics/" rel="category tag">particle physics</a>, <a href="https://www.physics.wisc.edu/category/phenomenology/" rel="category tag">phenomenology</a>, <a href="https://www.physics.wisc.edu/category/wipac/" rel="category tag">WIPAC</a></span> </footer> </article> <article id="post-11304" class="post-11304 post type-post status-publish format-standard has-post-thumbnail hentry category-particle-physics category-quantum-computing category-quantum-science category-undergraduate tag-cqe tag-flavor tag-neutrinos tag-open-quantum-initiative tag-oqi tag-quantum-science"> <header class="entry-header"> <h1 class="page-title uw-mini-bar">Bringing the Quantum to the Classical: A Hybrid Simulation of Supernova Neutrinos</h1> <div class="entry-meta"> <span class="posted-on">Posted on <a href="https://www.physics.wisc.edu/2024/04/18/bringing-the-quantum-to-the-classical-a-hybrid-simulation-of-supernova-neutrinos/" rel="bookmark"><time class="entry-date published updated" datetime="2024-04-18T10:21:57-05:00">April 18, 2024</time></a></span> </div><!-- .entry-meta --> </header> <div class="entry-content"> <p><em>By <a href="https://www.physics.wisc.edu/directory/heimsoth-daniel/">Daniel Heimsoth</a>, Physics PhD student</em></p> <p><span data-contrast="auto">Simulating quantum systems on classical computers is currently a near-impossible task, as memory and computation time requirements scale exponentially with the size of the system. Quantum computers promise to solve this scalability issue, but there is just one problem: they can’t reliably do that right now because of exorbitant amounts of noise.</span><span data-ccp-props="{}"> </span></p> <p><span data-contrast="auto">So when UW–Madison physics postdoc <a href="https://www.physics.wisc.edu/directory/siwach-pooja/">Pooja Siwach</a>, former undergrad Katie Harrison BS ‘23, and professor <a href="https://www.physics.wisc.edu/directory/balantekin-a-b/">Baha Balantekin</a> wanted to simulate neutrino evolution inside a supernova, they needed to get creative.</span><span data-ccp-props="{}"> </span><span data-ccp-props="{}"> </span></p> <figure id="attachment_11305" class="wp-caption alignleft" style="max-width: 200px;" aria-label="Pooja Siwach"><a href="https://www.physics.wisc.edu/wp-content/uploads/2024/04/Pooja-Siwach.jpg"><img loading="lazy" decoding="async" class="wp-image-11305" src="https://www.physics.wisc.edu/wp-content/uploads/2024/04/Pooja-Siwach-278x300.jpg" alt="profile photo of Pooja Siwach" width="200" height="216" srcset="https://www.physics.wisc.edu/wp-content/uploads/2024/04/Pooja-Siwach-278x300.jpg 278w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Pooja-Siwach-947x1024.jpg 947w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Pooja-Siwach-768x830.jpg 768w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Pooja-Siwach.jpg 1184w" sizes="auto, (max-width: 200px) 100vw, 200px" /></a><figcaption class="wp-caption-text">Pooja Siwach</figcaption></figure> <p><span data-contrast="auto">Their focus was on a phenomenon called collective neutrino oscillations, which describes a peculiar type of interaction between neutrinos. Neutrinos are unique among elementary particles in that they change type, or </span><i><span data-contrast="auto">flavor</span></i><span data-contrast="auto">, as they propagate through space. These oscillations between flavors are dictated by the density of neutrinos and other matter in the medium, both of which change from the core to the outer layers of a supernova. Physicists are interested in how the flavor composition of neutrinos evolve in time; this is calculated using a time evolution simulation, one of the most popular calculations currently done on quantum computers.</span><span data-ccp-props="{}"> </span><span data-ccp-props="{}"> </span></p> <p><span data-contrast="auto">Ideally, researchers could calculate each interaction between every possible pair of neutrinos in the system. However, supernovae produce around 10^58 neutrinos, a literally astronomical number. “It’s really complex, it’s very hard to solve on classical computers,” Siwach says. “That’s why we are interested in quantum computing because quantum computers are a natural way to map such problems.”</span><span data-ccp-props="{}"> </span></p> <figure id="attachment_11306" class="wp-caption alignleft" style="max-width: 200px;" aria-label="Katie Harrison"><a href="https://www.physics.wisc.edu/wp-content/uploads/2024/04/Katie-Harrison-e1713453211106.jpg"><img loading="lazy" decoding="async" class="wp-image-11306" src="https://www.physics.wisc.edu/wp-content/uploads/2024/04/Katie-Harrison-e1713453211106-300x300.jpg" alt="profile photo of Katie Harrison" width="200" height="200" srcset="https://www.physics.wisc.edu/wp-content/uploads/2024/04/Katie-Harrison-e1713453211106-300x300.jpg 300w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Katie-Harrison-e1713453211106-1024x1024.jpg 1024w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Katie-Harrison-e1713453211106-150x150.jpg 150w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Katie-Harrison-e1713453211106-768x769.jpg 768w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Katie-Harrison-e1713453211106-1200x1201.jpg 1200w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Katie-Harrison-e1713453211106-400x400.jpg 400w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Katie-Harrison-e1713453211106.jpg 1206w" sizes="auto, (max-width: 200px) 100vw, 200px" /></a><figcaption class="wp-caption-text">Katie Harrison</figcaption></figure> <p><span data-contrast="auto">This naturalness is due to the “two-level” similarities between quantum computers and neutrino flavors. Qubits are composed of two-level states, and neutrino flavor states are approximated as two levels in most physical systems including supernovae. </span><span data-ccp-props="{}"> </span></p> <p><span data-contrast="auto">In a <a href="https://journals.aps.org/prd/abstract/10.1103/PhysRevD.108.083039">paper published in Physical Review D</a> in October, Siwach, Harrison, and Balantekin studied the collective oscillation problem using a quantum-assisted simulator, or QAS, which combines the benefits of the natural mapping of the system onto qubits and classical computers’ strength in solving matrix equations.</span><span data-ccp-props="{}"> </span></p> <p><span data-contrast="auto">In QAS, the interactions between particles are broken down into a linear combination of products of Pauli matrices, which are the building blocks for quantum computing operations, while the state itself is split into a sum of simpler states. The quantum portion of the problem then boils down to computing products of basis states with each Pauli term in the interaction. These products are then inputted into the oscillation equations.</span></p> <figure id="attachment_11307" class="wp-caption alignright" style="max-width: 500px;" aria-label="Flavor composition (y-axis) of four supernova neutrinos over time due to collective oscillations, calculated using the quantum-assisted simulator. The change in flavor for each neutrino over time shows the effect of neutrino-neutrino interactions."><a href="https://www.physics.wisc.edu/wp-content/uploads/2024/04/OQI-1.png"><img loading="lazy" decoding="async" class="wp-image-11307 size-full" src="https://www.physics.wisc.edu/wp-content/uploads/2024/04/OQI-1.png" alt="a graph with 4 neutrino traces in 4 colors" width="500" height="404" srcset="https://www.physics.wisc.edu/wp-content/uploads/2024/04/OQI-1.png 500w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/OQI-1-300x242.png 300w" sizes="auto, (max-width: 500px) 100vw, 500px" /></a><figcaption class="wp-caption-text">Flavor composition (y-axis) of four supernova neutrinos over time due to collective oscillations, calculated using the quantum-assisted simulator. The change in flavor for each neutrino over time shows the effect of neutrino-neutrino interactions.</figcaption></figure> <p><span data-contrast="auto">“Then we get the linear-algebraic equations to solve, and solving such equations on a quantum computer requires a lot of resources,” explains Siwach. “That part we do on classical computers.” </span><span data-ccp-props="{}"> </span></p> <p><span data-contrast="auto">This approach allows researchers to use the quantum computers only once before the actual time evolution simulation is done on a classical computer, avoiding common pitfalls in quantum calculations such as error accumulation over the length of the simulation due to noisy gates. The authors showed that the QAS results for a four-neutrino system match with a pure classical calculation, showcasing the power of this approach, especially compared to a purely quantum simulation which quickly deviates from the exact solution due to accumulated errors from gates controlling two qubits at the same time.</span><span data-ccp-props="{}"> </span></p> <p><span data-contrast="auto">Still, as with any current application of quantum computers, there are limitations. “There’s only so much information that we can compute in a reasonable amount of time [on quantum computers],” says Siwach. She also laments the scalability of both the QAS and full quantum simulation. “One more hurdle is scaling to a larger number of neutrinos. If we scale to five or six neutrinos, it will require more qubits and more time, because we have to reduce the time step as well.”</span><span data-ccp-props="{}"> </span></p> <p><span data-contrast="auto">Harrison, who was an undergraduate physics student at UW–Madison during this project, was supported by a fellowship from the <a href="https://chicagoquantum.org/oqi-undergraduate-fellowship">Open Quantum Initiative</a>, a new program to expand undergrad research experiences in quantum computing and quantum information science. She enjoyed her time in the program and thinks that it benefits students looking to get involved in research in the field: “I think it’s really good for students to see what it really means to do research and to see if it’s something that you’re capable of doing or something that you’re interested in.”</span><span data-ccp-props="{}"> </span></p> <figure id="attachment_11308" class="wp-caption aligncenter" style="max-width: 500px;" aria-label="Flavor composition of a neutrino over time using a full quantum simulation (red points) compared to exact solution (black line). The points start to drift from the exact solution after only a few oscillations, highlighting how noise in the quantum computer negatively affects the calculation."><a href="https://www.physics.wisc.edu/wp-content/uploads/2024/04/OQI-2.png"><img loading="lazy" decoding="async" class="wp-image-11308 size-full" src="https://www.physics.wisc.edu/wp-content/uploads/2024/04/OQI-2.png" alt="trace of neutrino flavor composition over time comparing a quantum simulation to a full classical one" width="500" height="274" srcset="https://www.physics.wisc.edu/wp-content/uploads/2024/04/OQI-2.png 500w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/OQI-2-300x164.png 300w" sizes="auto, (max-width: 500px) 100vw, 500px" /></a><figcaption class="wp-caption-text">Flavor composition of a neutrino over time using a full quantum simulation (red points) compared to exact solution (black line). The points start to drift from the exact solution after only a few oscillations, highlighting how noise in the quantum computer negatively affects the calculation.</figcaption></figure> <p><span data-ccp-props="{}"> </span></p> </div> <footer class="entry-footer"> <span class="cat-links">Posted in <a href="https://www.physics.wisc.edu/category/particle-physics/" rel="category tag">particle physics</a>, <a href="https://www.physics.wisc.edu/category/quantum-computing/" rel="category tag">Quantum Computing</a>, <a href="https://www.physics.wisc.edu/category/quantum-science/" rel="category tag">Quantum Science</a>, <a href="https://www.physics.wisc.edu/category/undergraduate/" rel="category tag">Undergraduate</a></span><span class="tags-links">Tagged <a href="https://www.physics.wisc.edu/tag/cqe/" rel="tag">CQE</a>, <a href="https://www.physics.wisc.edu/tag/flavor/" rel="tag">flavor</a>, <a href="https://www.physics.wisc.edu/tag/neutrinos/" rel="tag">neutrinos</a>, <a href="https://www.physics.wisc.edu/tag/open-quantum-initiative/" rel="tag">Open Quantum Initiative</a>, <a href="https://www.physics.wisc.edu/tag/oqi/" rel="tag">OQI</a>, <a href="https://www.physics.wisc.edu/tag/quantum-science/" rel="tag">quantum science</a></span> </footer> </article> <article id="post-11302" class="post-11302 post type-post status-publish format-standard has-post-thumbnail hentry category-awards-and-honors category-particle-physics category-phenomenology tag-aaas"> <header class="entry-header"> <h1 class="page-title uw-mini-bar">Vernon Barger elected AAAS Fellow</h1> <div class="entry-meta"> <span class="posted-on">Posted on <a href="https://www.physics.wisc.edu/2024/04/18/vernon-barger-elected-aaas-fellow/" rel="bookmark"><time class="entry-date published updated" datetime="2024-04-18T09:53:02-05:00">April 18, 2024</time></a></span> </div><!-- .entry-meta --> </header> <div class="entry-content"> <p><em>This story is modified from one <a href="https://news.wisc.edu/aaas-members-make-six-uw-researchers-new-fellows/">published</a> by University Communications </em></p> <figure id="attachment_11286" class="wp-caption alignleft" style="max-width: 300px;" aria-label="Vernon Barger"><a href="https://www.physics.wisc.edu/wp-content/uploads/2024/04/Vernon-Barger-2024.jpeg"><img loading="lazy" decoding="async" class="size-medium wp-image-11286" src="https://www.physics.wisc.edu/wp-content/uploads/2024/04/Vernon-Barger-2024-300x300.jpeg" alt="profile photo of Vernon Barger" width="300" height="300" srcset="https://www.physics.wisc.edu/wp-content/uploads/2024/04/Vernon-Barger-2024-300x300.jpeg 300w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Vernon-Barger-2024-1024x1024.jpeg 1024w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Vernon-Barger-2024-150x150.jpeg 150w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Vernon-Barger-2024-768x768.jpeg 768w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Vernon-Barger-2024-1536x1536.jpeg 1536w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Vernon-Barger-2024-2048x2048.jpeg 2048w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Vernon-Barger-2024-1200x1200.jpeg 1200w, https://www.physics.wisc.edu/wp-content/uploads/2024/04/Vernon-Barger-2024-400x400.jpeg 400w" sizes="auto, (max-width: 300px) 100vw, 300px" /></a><figcaption class="wp-caption-text">Vernon Barger</figcaption></figure> <p>Eight University of Wisconsin–Madison scholars — including physics professor <a href="https://www.physics.wisc.edu/directory/barger-vernon/">Vernon Barger</a> — have been elected <a href="https://www.aaas.org/fellows">fellows of the American Association for the Advancement of Science</a>, the world’s largest general scientific society.</p> <p>Barger was elected for “seminal work in studying fundamental particles at colliders and leadership in particle phenomenology, where theory meets experiment.”</p> <p>This year, 502 scientists, engineers and innovators were chosen from the AAAS membership to be AAAS Fellows. The honor, presented annually since 1874, recognizes efforts to advance science and society, with the fellows chosen to reflect the highest standards of scientific integrity and professional ethics.</p> <p>“As we celebrate the 150th anniversary of the AAAS Fellows, AAAS is proud to recognize the newly elected individuals,” said Sudip S. Parikh, AAAS chief executive officer and executive publisher of the Science family of journals. “This year’s class embodies scientific excellence, fosters trust in science throughout the communities they serve and leads the next generation of scientists while advancing scientific achievements.”</p> <p>The new class of fellows will be featured in the April issue of the journal Science, and each new fellow will be celebrated at a September event in Washington, D.C.</p> </div> <footer class="entry-footer"> <span class="cat-links">Posted in <a href="https://www.physics.wisc.edu/category/awards-and-honors/" rel="category tag">Awards and Honors</a>, <a href="https://www.physics.wisc.edu/category/particle-physics/" rel="category tag">particle physics</a>, <a href="https://www.physics.wisc.edu/category/phenomenology/" rel="category tag">phenomenology</a></span><span class="tags-links">Tagged <a href="https://www.physics.wisc.edu/tag/aaas/" rel="tag">AAAS</a></span> </footer> </article> <article id="post-10719" class="post-10719 post type-post status-publish format-standard has-post-thumbnail hentry category-awards-and-honors category-high-energy category-outreach category-particle-physics tag-cern tag-hep tag-high-energy tag-particle-physics tag-public-engagement tag-scicomm"> <header class="entry-header"> <h1 class="page-title uw-mini-bar">Wasikul Islam wins 2024 WISL award for communicating science</h1> <div class="entry-meta"> <span class="posted-on">Posted on <a href="https://www.physics.wisc.edu/2024/03/21/wasikul-islam-wins-2024-wisl-award-for-communicating-science/" rel="bookmark"><time class="entry-date published updated" datetime="2024-03-21T12:40:09-05:00">March 21, 2024</time></a></span> </div><!-- .entry-meta --> </header> <div class="entry-content"> <p>Wasikul Islam, a postdoc with Prof. Sau Lan Wu, is a winner of the 2024 Wisconsin Initiative for Science Literacy <a href="http://scifun.org/Thesis_Awards/postdoc-awards/postdoc_awards.html">Award for Communicating Postdoctoral Research to the Public</a>.</p> <figure id="attachment_10720" class="wp-caption alignleft" style="max-width: 300px;" aria-label="Wasikul Islam, a postdoctoral researcher with Sau Lan Wu&#8217;s group"><a href="https://www.physics.wisc.edu/wp-content/uploads/2024/03/Wasikul_headshot.png"><img loading="lazy" decoding="async" class="wp-image-10720 size-medium" src="https://www.physics.wisc.edu/wp-content/uploads/2024/03/Wasikul_headshot-300x230.png" alt="profile picture of Wasikul Islam" width="300" height="230" srcset="https://www.physics.wisc.edu/wp-content/uploads/2024/03/Wasikul_headshot-300x230.png 300w, https://www.physics.wisc.edu/wp-content/uploads/2024/03/Wasikul_headshot-1024x786.png 1024w, https://www.physics.wisc.edu/wp-content/uploads/2024/03/Wasikul_headshot-768x590.png 768w, https://www.physics.wisc.edu/wp-content/uploads/2024/03/Wasikul_headshot-1200x922.png 1200w, https://www.physics.wisc.edu/wp-content/uploads/2024/03/Wasikul_headshot.png 1401w" sizes="auto, (max-width: 300px) 100vw, 300px" /></a><figcaption class="wp-caption-text">Wasikul Islam, a postdoctoral researcher with Sau Lan Wu’s group</figcaption></figure> <p>For this award, postdocs write a short article that describes their research for the general public. Interested postdocs apply to submit an article, then receive guidelines and editorial assistance to improve accessibility. Approved articles are posted on the WISL website, and the author receives a $250 award.</p> <p>Islam’s article, “<a href="http://scifun.org/Thesis_Awards/postdoc-awards/islam-article.pdf">Navigating Anomalies in the Pursuit of New Physics</a>” shares how particle physicists study the fundamental building blocks of the universe, exploring the complex behaviors of subatomic particles that shape our world.</p> <p>“As a postdoctoral researcher, my journey is not limited to research alone,” Islam says in the article. “It comes with an important responsibility to share the wonders and experiences of scientific research with diverse communities.”</p> <p>The dual mission of the Wisconsin Initiative for Science Literacy is to promote literacy in science, mathematics and technology among the general public and to attract future generations to careers in research, teaching and public service. WISL is directed by Professor Bassam Z. Shakhashiri of the University of Wisconsin-Madison Chemistry Department. Programs draw on the concepts developed by Dr. Shakhashiri during many years of innovative work in science education.</p> </div> <footer class="entry-footer"> <span class="cat-links">Posted in <a href="https://www.physics.wisc.edu/category/awards-and-honors/" rel="category tag">Awards and Honors</a>, <a href="https://www.physics.wisc.edu/category/high-energy/" rel="category tag">High Energy</a>, <a href="https://www.physics.wisc.edu/category/outreach/" rel="category tag">Outreach</a>, <a href="https://www.physics.wisc.edu/category/particle-physics/" rel="category tag">particle physics</a></span><span class="tags-links">Tagged <a href="https://www.physics.wisc.edu/tag/cern/" rel="tag">CERN</a>, <a href="https://www.physics.wisc.edu/tag/hep/" rel="tag">HEP</a>, <a href="https://www.physics.wisc.edu/tag/high-energy/" rel="tag">high energy</a>, <a href="https://www.physics.wisc.edu/tag/particle-physics/" rel="tag">particle physics</a>, <a href="https://www.physics.wisc.edu/tag/public-engagement/" rel="tag">public engagement</a>, <a href="https://www.physics.wisc.edu/tag/scicomm/" rel="tag">scicomm</a></span> </footer> </article> <article id="post-10296" class="post-10296 post type-post status-publish format-standard has-post-thumbnail hentry category-astrophysics category-cosmology category-dark-matter category-high-energy category-particle-physics category-wipac"> <header class="entry-header"> <h1 class="page-title uw-mini-bar">Federal physics advisory panel — including Profs. Bose and Cranmer — announces particle physics recommendations</h1> <div class="entry-meta"> <span class="posted-on">Posted on <a href="https://www.physics.wisc.edu/2023/12/08/federal-physics-advisory-panel-including-profs-bose-and-cranmer-announces-particle-physics-recommendations/" rel="bookmark"><time class="entry-date published updated" datetime="2023-12-08T08:58:27-06:00">December 8, 2023</time></a></span> </div><!-- .entry-meta --> </header> <div class="entry-content"> <p>Earlier this year, physics professors Tulika Bose and Kyle Cranmer were selected to serve on the Particle Physics Project Prioritization Panel, or P5, a group of High Energy Physics experts that advises the Department of Energy Office of Science and the National Science Foundation’s Division of Physics on high energy and particle physics matters.</p> <p>P5 announced their <a href="https://www.usparticlephysics.org/2023-p5-report/">recommendations in a draft report published Dec. 7</a> — and UW–Madison physicists are featured in many of the projects.</p> <p>One recommendation is to move forward with a planned expansion of the <a href="https://icecube.wisc.edu/">IceCube Neutrino Observatory</a>, an international scientific collaboration operated by the UW–Madison at the South Pole. Other recommendations include support for a separate neutrino experiment based in Illinois (the Deep Underground Neutrino Experiment, or DUNE); continuing investment in the Large Hadron Collider in Switzerland and the Rubin Observatory in Chile; and expanding involvement in the Cherenkov Telescope Array (CTA), a ground-based very-high-energy gamma ray observatory. UW–Madison physicists have leading roles in all of these research efforts.</p> <p>Additional recommendations include the development of a next generation of ground-based telescopes to observe the cosmic microwave background and a direct dark matter detector experiment, among others.</p> <p style="text-align: center"><a class="uw-button uw-button-red" href="https://news.wisc.edu/federal-physics-advisory-panel-recommends-funding-next-generation-icecube-observatory-other-major-experiments/">Read the full story</a></p> </div> <footer class="entry-footer"> <span class="cat-links">Posted in <a href="https://www.physics.wisc.edu/category/astrophysics/" rel="category tag">Astrophysics</a>, <a href="https://www.physics.wisc.edu/category/cosmology/" rel="category tag">Cosmology</a>, <a href="https://www.physics.wisc.edu/category/dark-matter/" rel="category tag">Dark Matter</a>, <a href="https://www.physics.wisc.edu/category/high-energy/" rel="category tag">High Energy</a>, <a href="https://www.physics.wisc.edu/category/particle-physics/" rel="category tag">particle physics</a>, <a href="https://www.physics.wisc.edu/category/wipac/" rel="category tag">WIPAC</a></span> </footer> </article> <nav class="pagination-container" aria-label="Pagination"><ul class="pagination"><li class="current"><span class="show-for-sr">You're on page</span> 1</li><li><a class="page-numbers" href="https://www.physics.wisc.edu/category/particle-physics/page/2/">2</a></li><li class="pagination-next"><a class="next page-numbers" href="https://www.physics.wisc.edu/category/particle-physics/page/2/">Next <span class="show-for-sr">page</span></a></li></ul></nav> </main> </div> <footer id="colophon" class="uw-footer"> <h2 class="show-for-sr uw-footer-header">Site footer content</h2> <div class="uw-footer-content"> <div class="uw-logo"> <div class="uw-logo-link-wrapper"><a href="https://www.wisc.edu" aria-label="Link to main university website"> <svg viewBox="0 0 326 216" version="1.1" role="img" focusable="false" aria-labelledby="dynid674f1e243f32f7.44027192"> <title id="dynid674f1e243f32f7.44027192">University logo that links to main university website</title> <g> <path d="M21.3,195.1c-5.7-4.1-6.2-3.7-8.3-10.1l-7.3-23c-1.1-3.4-2.1-7.5-5.2-9.6v-0.2h9.1c-0.2,1.4,0.4,3.3,0.7,4.5l9.3,28.9 l7.3-23.7c1.2-3.8,2.4-7.8-1-9.6v-0.2h8.8c-0.4,1.6,0.1,3.5,0.9,6.3l8.7,27l7-22.8c1.1-3.5,3.2-8.6-1.7-10.3v-0.2h9.6l-13.1,42.8 c-5.7-3.9-6.2-3.6-8.2-10L31,163.7L21.3,195.1z"/> <path d="M64.5,161.1c0-2.9,0.4-7.4-2.7-8.6v-0.2h11.8v0.2c-3.1,1.2-2.7,5.8-2.7,8.6v23.5c0,2.8-0.4,7.3,2.7,8.5v0.2H61.7v-0.2 c3.1-1.1,2.7-5.7,2.7-8.5V161.1z"/> <path d="M102.2,159.7c-2.4-2.5-6.3-3.9-9.8-3.9c-3.5,0-8,1.4-8,5.7c0,8.5,21.4,8.4,21.4,19.9c0,6.7-7,12.9-16.7,12.9 c-3.8,0-7.6-0.6-11.1-1.9l-1.8-7.8c3.7,3.2,8.8,5.2,13.6,5.2c3.5,0,8.9-2.1,8.9-6.5c0-9.7-21.4-8-21.4-21.2c0-7.8,8-10.8,15.6-10.8 c3.1,0,6.3,0.4,9.3,1.4V159.7z"/> <path d="M141.5,160c-3.4-2.2-7.4-3.5-11.5-3.5c-8.6,0-14.6,6.3-14.6,15.3c0,9.2,6.2,17.3,15.8,17.3c4.7,0,9.3-1.7,13.3-3.9h0.2 l-3.2,7.2c-2.9,1.4-6.2,1.9-9.4,1.9c-14.7,0-23.8-8.2-23.8-21.5c0-12.9,9.1-21.4,21.8-21.4c3.8,0,7.7,0.7,11.3,1.6V160z"/> <path d="M189.9,172.3c0,12.7-10.5,21.9-22.9,21.9c-12.3,0-22.7-8.8-22.7-21.6c0-11.8,10.3-21.7,23.3-21.4 C180.7,151.2,189.9,161.1,189.9,172.3z M151.3,172.1c0,8.7,6.2,17.7,15.9,17.7c9.5,0,15.5-6.9,15.5-16.2c0-9.1-5.8-17.9-15.6-17.9 C157.5,155.7,151.3,162.7,151.3,172.1z"/> <path d="M199.3,185.2c0,3.5-0.1,6,3.2,7.9v0.2h-11v-0.2c3.3-1.9,3.3-4.4,3.3-7.9v-24.8c0-3.5,0-6-3.2-7.8v-0.2h9.1v0.1 c0.2,0.7,0.5,1.1,0.9,1.6l0.9,1.2l22.8,28.8v-23.6c0-3.5,0.1-6-3.2-7.8v-0.2h11v0.2c-3.2,1.9-3.2,4.4-3.2,7.8v34.9 c-4.4-1.5-6.4-3.5-9.1-7.1l-21.4-27.1V185.2z"/> <path d="M261.2,159.7c-2.4-2.5-6.3-3.9-9.8-3.9c-3.5,0-8,1.4-8,5.7c0,8.5,21.4,8.4,21.4,19.9c0,6.7-7,12.9-16.7,12.9 c-3.8,0-7.6-0.6-11.1-1.9l-1.8-7.8c3.7,3.2,8.8,5.2,13.6,5.2c3.5,0,8.9-2.1,8.9-6.5c0-9.7-21.4-8-21.4-21.2c0-7.8,8-10.8,15.6-10.8 c3.1,0,6.3,0.4,9.3,1.4V159.7z"/> <path d="M270.7,161.1c0-2.9,0.4-7.4-2.7-8.6v-0.2h11.8v0.2c-3.1,1.2-2.7,5.8-2.7,8.6v23.5c0,2.8-0.4,7.3,2.7,8.5v0.2H268v-0.2 c3.1-1.1,2.7-5.7,2.7-8.5V161.1z"/> <path d="M291.8,185.2c0,3.5-0.1,6,3.2,7.9v0.2h-11v-0.2c3.3-1.9,3.3-4.4,3.3-7.9v-24.8c0-3.5,0-6-3.2-7.8v-0.2h9.1v0.1 c0.2,0.7,0.5,1.1,0.9,1.6l0.9,1.2l22.8,28.8v-23.6c0-3.5,0.1-6-3.2-7.8v-0.2h11v0.2c-3.2,1.9-3.2,4.4-3.2,7.8v34.9 c-4.4-1.5-6.4-3.5-9.1-7.1l-21.4-27.1V185.2z"/> </g> <g> <path d="M11.7,203.2v7c0,2.7,1.5,3.5,3,3.5c1.7,0,3-0.8,3-3.5v-7h1.5v6.9c0,3.8-2.1,4.8-4.5,4.8c-2.4,0-4.5-1.2-4.5-4.7v-7H11.7z"/> <path d="M22.3,214.8v-11.6h2c1.7,2.7,5.3,8.5,5.9,9.7h0c-0.1-1.5-0.1-3.3-0.1-5.2v-4.5h1.4v11.6h-1.9c-1.5-2.5-5.3-8.7-6-10h0 c0.1,1.3,0.1,3.3,0.1,5.4v4.6H22.3z"/> <path d="M36.6,203.2v11.6h-1.5v-11.6H36.6z"/> <path d="M42.9,214.8l-4.2-11.6h1.6l2,5.8c0.6,1.7,1.2,3.4,1.4,4.5h0c0.2-0.9,0.9-2.7,1.5-4.4l2.1-5.8H49l-4.4,11.6H42.9z"/> <path d="M58.4,209.3h-5.7v4.1H59l-0.2,1.3h-7.6v-11.6h7.5v1.3h-6v3.5h5.7V209.3z"/> <path d="M63,209.7v5.1h-1.5v-11.6H66c2.4,0,3.6,1.3,3.6,3.1c0,1.5-0.9,2.4-2,2.7c0.9,0.2,1.8,1,1.8,3v0.5c0,0.8,0,1.8,0.2,2.3h-1.5 c-0.2-0.5-0.2-1.4-0.2-2.5V212c0-1.6-0.5-2.4-2.5-2.4H63z M63,208.4h2.5c1.8,0,2.5-0.7,2.5-2c0-1.2-0.8-1.9-2.4-1.9H63V208.4z"/> <path d="M73.3,211.5c0.3,1.4,1.3,2.1,2.9,2.1c1.8,0,2.5-0.8,2.5-1.9c0-1.2-0.6-1.8-2.9-2.4c-2.7-0.7-3.7-1.6-3.7-3.2 c0-1.7,1.3-3.1,3.8-3.1c2.8,0,3.9,1.6,4.1,3.1h-1.6c-0.2-1-0.8-1.9-2.5-1.9c-1.4,0-2.2,0.6-2.2,1.7c0,1.1,0.6,1.5,2.7,2 c3.3,0.8,3.9,2.1,3.9,3.6c0,1.9-1.4,3.3-4.2,3.3c-2.9,0-4.2-1.6-4.4-3.4H73.3z"/> <path d="M84.5,203.2v11.6H83v-11.6H84.5z"/> <path d="M90.4,204.5h-3.7v-1.3h9v1.3h-3.7v10.3h-1.5V204.5z"/> <path d="M101.2,214.8v-4.2c0-0.1,0-0.2-0.1-0.3l-4.1-7h1.8c1,1.9,2.7,4.9,3.3,5.9c0.5-1,2.2-4,3.3-5.9h1.6l-4.2,7 c0,0.1-0.1,0.1-0.1,0.3v4.2H101.2z"/> <path d="M123.5,208.9c0,3.2-1.8,6-5.4,6c-3.4,0-5.3-2.6-5.3-5.9c0-3.3,1.9-5.9,5.4-5.9C121.5,203,123.5,205.5,123.5,208.9z M114.4,208.9c0,2.5,1.3,4.7,3.8,4.7c2.7,0,3.8-2.2,3.8-4.7c0-2.5-1.2-4.6-3.8-4.6C115.5,204.3,114.4,206.5,114.4,208.9z"/> <path d="M126.3,203.2h7.4v1.3h-5.9v3.8h5.5v1.3h-5.5v5.2h-1.5V203.2z"/> <path d="M142.5,214.8l-3.1-11.6h1.6c0.9,3.8,2.1,8.6,2.4,9.9h0c0.3-1.5,1.9-6.9,2.6-9.9h1.5c0.7,2.6,2.3,8.5,2.5,9.8h0 c0.4-2,2-7.5,2.6-9.8h1.5l-3.4,11.6h-1.6c-0.7-2.7-2.2-8.2-2.5-9.6h0c-0.3,1.7-1.8,6.9-2.6,9.6H142.5z"/> <path d="M158,203.2v11.6h-1.5v-11.6H158z"/> <path d="M162.2,211.5c0.3,1.4,1.3,2.1,2.9,2.1c1.8,0,2.5-0.8,2.5-1.9c0-1.2-0.6-1.8-2.9-2.4c-2.7-0.7-3.7-1.6-3.7-3.2 c0-1.7,1.3-3.1,3.8-3.1c2.8,0,3.9,1.6,4.1,3.1h-1.6c-0.2-1-0.8-1.9-2.5-1.9c-1.4,0-2.2,0.6-2.2,1.7c0,1.1,0.6,1.5,2.7,2 c3.3,0.8,3.9,2.1,3.9,3.6c0,1.9-1.4,3.3-4.2,3.3c-2.9,0-4.2-1.6-4.4-3.4H162.2z"/> <path d="M181.1,211.5c-0.5,2-2,3.4-4.6,3.4c-3.5,0-5.2-2.6-5.2-5.9c0-3.1,1.7-6,5.3-6c2.7,0,4.2,1.6,4.6,3.5h-1.5 c-0.4-1.3-1.2-2.2-3.1-2.2c-2.6,0-3.6,2.3-3.6,4.7c0,2.3,1,4.7,3.7,4.7c1.8,0,2.6-1,3-2.1H181.1z"/> <path d="M193.9,208.9c0,3.2-1.8,6-5.4,6c-3.4,0-5.3-2.6-5.3-5.9c0-3.3,1.9-5.9,5.4-5.9C191.8,203,193.9,205.5,193.9,208.9z M184.7,208.9c0,2.5,1.3,4.7,3.8,4.7c2.7,0,3.8-2.2,3.8-4.7c0-2.5-1.2-4.6-3.8-4.6C185.9,204.3,184.7,206.5,184.7,208.9z"/> <path d="M196.6,214.8v-11.6h2c1.7,2.7,5.3,8.5,5.9,9.7h0c-0.1-1.5-0.1-3.3-0.1-5.2v-4.5h1.4v11.6H204c-1.5-2.5-5.3-8.7-6-10h0 c0.1,1.3,0.1,3.3,0.1,5.4v4.6H196.6z"/> <path d="M210.1,211.5c0.3,1.4,1.3,2.1,2.9,2.1c1.8,0,2.5-0.8,2.5-1.9c0-1.2-0.6-1.8-2.9-2.4c-2.7-0.7-3.7-1.6-3.7-3.2 c0-1.7,1.3-3.1,3.8-3.1c2.8,0,3.9,1.6,4.1,3.1h-1.6c-0.2-1-0.8-1.9-2.5-1.9c-1.4,0-2.2,0.6-2.2,1.7c0,1.1,0.6,1.5,2.7,2 c3.3,0.8,3.9,2.1,3.9,3.6c0,1.9-1.4,3.3-4.2,3.3c-2.9,0-4.2-1.6-4.4-3.4H210.1z"/> <path d="M221.3,203.2v11.6h-1.5v-11.6H221.3z"/> <path d="M224.8,214.8v-11.6h2c1.7,2.7,5.3,8.5,5.9,9.7h0c-0.1-1.5-0.1-3.3-0.1-5.2v-4.5h1.4v11.6h-1.9c-1.5-2.5-5.3-8.7-6-10h0 c0.1,1.3,0.1,3.3,0.1,5.4v4.6H224.8z"/> <path d="M243.4,209.8v1.3h-6.6v-1.3H243.4z"/> <path d="M256.1,209.8c0-2.2,0-4.3,0.1-5.6h-0.1c-0.5,1.9-2.4,6.8-3.7,10.5H251c-1-3-2.9-8.5-3.5-10.5h0c0.1,1.3,0.1,3.9,0.1,5.9 v4.6h-1.4v-11.6h2.3c1.3,3.6,2.9,8.2,3.3,9.7h0c0.3-1.1,2.2-6.2,3.5-9.7h2.2v11.6h-1.5V209.8z"/> <path d="M262.6,211.3l-1.2,3.5h-1.5l4.1-11.6h1.9l4.3,11.6h-1.6l-1.3-3.5H262.6z M266.8,210c-1.1-3-1.7-4.7-2-5.5h0 c-0.3,1-1,2.9-1.8,5.5H266.8z"/> <path d="M272.3,203.2h4.1c3.3,0,5.5,2.2,5.5,5.7c0,3.4-2.1,5.9-5.5,5.9h-4.1V203.2z M273.8,213.5h2.4c2.7,0,4-2,4-4.6 c0-2.3-1.2-4.4-4-4.4h-2.4V213.5z"/> <path d="M286.2,203.2v11.6h-1.5v-11.6H286.2z"/> <path d="M290.3,211.5c0.3,1.4,1.3,2.1,2.9,2.1c1.8,0,2.5-0.8,2.5-1.9c0-1.2-0.6-1.8-2.9-2.4c-2.7-0.7-3.7-1.6-3.7-3.2 c0-1.7,1.3-3.1,3.8-3.1c2.8,0,3.9,1.6,4.1,3.1h-1.6c-0.2-1-0.8-1.9-2.5-1.9c-1.4,0-2.2,0.6-2.2,1.7c0,1.1,0.6,1.5,2.7,2 c3.3,0.8,3.9,2.1,3.9,3.6c0,1.9-1.4,3.3-4.2,3.3c-2.9,0-4.2-1.6-4.4-3.4H290.3z"/> <path d="M310.1,208.9c0,3.2-1.8,6-5.4,6c-3.4,0-5.3-2.6-5.3-5.9c0-3.3,1.9-5.9,5.4-5.9C308.1,203,310.1,205.5,310.1,208.9z M301,208.9c0,2.5,1.3,4.7,3.8,4.7c2.7,0,3.8-2.2,3.8-4.7c0-2.5-1.2-4.6-3.8-4.6C302.2,204.3,301,206.5,301,208.9z"/> <path d="M312.9,214.8v-11.6h2c1.7,2.7,5.3,8.5,5.9,9.7h0c-0.1-1.5-0.1-3.3-0.1-5.2v-4.5h1.4v11.6h-1.9c-1.5-2.5-5.3-8.7-6-10h0 c0.1,1.3,0.1,3.3,0.1,5.4v4.6H312.9z"/> </g> <path d="M211.4,52c-0.3-3-0.8-6-1.4-8.9c-0.6-2.7-1.3-5.4-2.3-8c-1-2.8-2.2-5.5-3.6-8c-1.4-2.4-3-4.6-4.8-6.7 c-4.9-5.4-11.1-8.4-17.8-8.5l-0.1,0c-1.1-2.4-4.1-4.4-6.8-4.7c0,0-1.4-6-7.8-6.1c-6.4,0-7.8,6.1-7.8,6.1c-2.6,0.4-5.7,2.3-6.8,4.7 l-0.1,0c-6.8,0.1-12.9,3.1-17.8,8.5c-1.9,2-3.4,4.3-4.8,6.7c-1.4,2.5-2.6,5.3-3.6,8c-0.9,2.6-1.7,5.3-2.3,8 c-0.6,2.9-1.1,5.9-1.4,8.9c-3.7,36.8,12.8,82,42.5,88.9c0.5,0.7,1.5,2.1,2.1,2.1c0.6,0,1.6-1.4,2.1-2.1 C198.6,134,215.1,88.8,211.4,52z M166.8,2.5c5.2,0,6.4,4.4,6.4,4.5c-2.6,0.2-5,1.7-6.3,4c0,0-0.1,0.2-0.1,0.2 c-0.1,0-0.1-0.1-0.1-0.2c-1.3-2.3-3.7-3.8-6.3-4C160.4,6.9,161.5,2.5,166.8,2.5z M163.7,9.5c1.3,0.8,2.2,2,2.6,3.4 c0.1,0.4,0.3,0.7,0.4,0.7s0.3-0.3,0.4-0.7c0.4-1.4,1.3-2.7,2.6-3.4c3.8-2.3,8.1-0.8,9.8,2.6c-0.9,0.1-1.7,0.4-2.7,0.7 c-1.5,0.5-2.8,1.2-3.9,2.1c-2.4,2.2-4.5,5.6-4.9,9.9c-1.1,11.9,12.6,10,13.2,10c1.8,0,3.1-2.8,3.1-6.5c0-3.7-1.4-6.5-3.1-6.5 c-1.1,0-2.9,0.8-3.1,4.1c-0.1,2.3,1,5.4,2.5,5.6c0.8,0.1,1.5-1.2,1.7-2.6c0.2-1.2,0.1-3-1-3.3c-0.3-0.1-0.7,0.1-0.8,0.5 c-0.1,0.3,0.7,0.8,0.6,2.2c0,2-2.1,1-1.8-2.2c0.2-2.9,1.7-2.7,1.8-2.7c0.8,0,2.1,1.7,2.1,4.9c0,2.8-1.4,5.9-4,4.3 c-2.2-1.6-3.1-5.3-2.5-8.2c0.3-1.3,1.4-4.9,5.1-4.9c5.3,0,10.2,2.8,14.2,8c-0.4,1.4-3.2,6.7-11.8,11.7c-0.2,0.1-0.5,0.3-0.5,0.2 c-2.6-1.1-5.1-1.8-8-1.6c-2.6,0.1-5.1,0.6-7.5,1.2c-0.5,0.1-1,0.2-1.5,0.2c-0.5,0-1-0.1-1.5-0.2c-2.5-0.6-5-1.1-7.5-1.2 c-2.9-0.2-5.4,0.5-8,1.6c0,0-0.3-0.2-0.5-0.2c-8.7-5.1-11.4-10.3-11.8-11.7c3.9-5.2,8.9-8,14.2-8c3.7,0,4.8,3.6,5.1,4.9 c0.6,2.9-0.3,6.6-2.5,8.2c-2.6,1.6-4-1.5-4-4.3c0-3.2,1.2-4.9,2.1-4.9c0.1,0,1.5-0.2,1.8,2.7c0.3,3.2-1.8,4.2-1.8,2.2 c0-1.4,0.7-1.9,0.6-2.2c-0.1-0.3-0.4-0.5-0.8-0.5c-1.1,0.3-1.2,2.1-1,3.3c0.2,1.4,0.9,2.7,1.7,2.6c1.5-0.2,2.6-3.3,2.5-5.6 c-0.2-3.3-2-4.1-3.1-4.1c-1.7,0-3.1,2.8-3.1,6.5c0,3.7,1.3,6.5,3.1,6.5c0.7,0.1,14.3,1.9,13.2-10c-0.4-4.3-2.5-7.7-4.9-9.9 c-1.1-1-2.3-1.6-3.9-2.1c-1.1-0.3-1.8-0.5-2.7-0.7C155.6,8.7,159.9,7.1,163.7,9.5z M138.1,58.5c-4.4-0.4-7.8-1.9-9.4-2.7 c0.7-11.9,3.7-21.2,8.1-27.4c0.8,2,4.2,7.1,12,11.7C142.1,44,139.1,52.3,138.1,58.5z M149.6,41.4c2-1.2,4.5-1.8,7.1-2 c4.5-0.3,7.8,1.4,10,1.5h0.1c2.2-0.1,5.5-1.8,10-1.5c2.6,0.2,5.2,0.7,7.1,2c9.1,5.8,10.4,19.1,10.5,23.5c0.6,15.5-4.2,27.5-5.8,30.9 c-6.3,13.8-13.9,23.6-21.4,26.9l-0.6,0.3l-0.6-0.3c-7.5-3.3-15.1-13.1-21.4-26.9c-1.5-3.3-6.4-15.4-5.8-30.9 C139.2,60.6,140.5,47.2,149.6,41.4z M137.9,59.3c-0.3,2.3-0.5,4.2-0.5,5.4c-0.2,4.3,0,8.6,0.6,12.9c0.6,4,1.5,8,2.7,11.9 c1.7,5.3,4,10.3,6.7,15.2c-2.8,2.5-7,3.5-8.4,3.8c-7.5-15-11.4-34.3-10.5-51.7C130.4,57.6,133.7,59,137.9,59.3z M147.9,105.4 c5,8.6,10,13.8,13.7,16.5c-1.4,3.5-4.6,6.2-5.8,7.1c-6.5-4.4-12-11.3-16.4-19.7C141.2,108.9,145.1,107.9,147.9,105.4z M162.4,122.4 c2,1.5,4.1,2.3,4.3,2.4c0.3-0.1,2.3-0.9,4.3-2.4c1.4,3.4,4.4,6,5.7,7.1c-1.9,1.2-3.8,2.2-5.8,2.9c0-0.1,0-0.1,0-0.2 c-0.4-2.1-3.2-2.6-4.2-2.6c-1,0-3.8,0.4-4.2,2.6c0,0.1,0,0.1,0,0.2c-2-0.7-4-1.7-5.8-2.9C158,128.4,161,125.8,162.4,122.4z M171.9,121.9c3.8-2.7,8.7-7.9,13.7-16.5c2.8,2.5,6.7,3.5,8.4,3.8c-4.3,8.4-9.9,15.3-16.4,19.7C176.5,128.1,173.2,125.4,171.9,121.9 z M186,104.6c2.7-4.8,5-9.9,6.7-15.2c1.2-3.9,2.1-7.9,2.7-11.9c0.6-4.3,0.8-8.6,0.6-12.9c0-1.2-0.2-3.1-0.5-5.4 c4.3-0.4,7.6-1.7,9.3-2.6c0.9,17.4-3,36.8-10.5,51.7C193,108.2,188.8,107.2,186,104.6z M195.4,58.5c-1-6.2-4.1-14.3-10.7-18.5 c7.8-4.6,11.2-9.7,12-11.7c4.4,6.2,7.4,15.5,8.1,27.4C203.3,56.6,199.9,58.1,195.4,58.5z M161.9,138.3c-3.4-1.1-6.6-2.7-9.5-4.8 c-1.9-1.3-3.6-2.7-5.3-4.3c-1.3-1.3-2.6-2.6-3.8-4c-0.8-1-1.6-1.9-2.4-2.9c-3.6-4.8-6.7-10.2-9.1-15.7c-2.3-5.4-4.2-10.9-5.6-16.6 c-1.4-5.8-2.4-11.7-2.9-17.6c-0.5-5.8-0.6-11.8-0.1-17.6c0.3-3.1,0.6-6.3,1.2-9.4c0.6-3.1,1.3-6.1,2.3-9.1c0.9-2.7,2-5.4,3.4-7.9 c1.4-2.6,3.1-5.1,5.1-7.2c1.9-2,4-3.7,6.4-5c1-0.5,2.1-1,3.1-1.4c0.5-0.2,1.1-0.4,1.7-0.5c0.5-0.1,1.1-0.4,1.7-0.4 c1.4-0.3,2.8-0.4,4.2-0.4c1.1,0,3.9,0.2,6.3,1.7c2.7,1.9,5,5,5.4,9.8c0.6,7.3-6.8,8.5-8.3,8.5c-0.2,0-0.3-0.2,0.4-1 c1.7-2.2,2.3-5.6,1.7-8.3c-0.7-3.4-3.1-6-6.5-6c-5.2,0-9.8,2.6-13.2,6.3c-3.3,3.6-5.6,8.2-7.3,12.8c-2.1,5.9-3.2,12.2-3.6,18.5 c-0.4,5.8-0.2,11.6,0.4,17.3c0.6,5.8,1.7,11.6,3.2,17.2c1.5,5.5,3.4,10.9,5.7,16c2.4,5.2,5.3,10.2,8.9,14.7 c3.6,4.5,8.1,8.5,13.2,11.2c1.2,0.6,2.4,1.1,3.6,1.6c-0.1,1.9,0.4,3.6,1.1,5C162.6,138.6,162.6,138.5,161.9,138.3z M167.3,140.8 c0,0-0.3,0.3-0.5,0.3c-0.3,0-0.5-0.3-0.5-0.3c-1.3-1.6-3.2-4.7-2.5-8.4c0.2-1,2-1.5,3-1.5c1,0,2.8,0.5,3,1.5 C170.4,136.1,168.5,139.2,167.3,140.8z M210.2,72.4c-0.5,5.9-1.5,11.8-2.9,17.6c-1.4,5.7-3.2,11.2-5.6,16.6 c-2.4,5.5-5.4,10.9-9.1,15.7c-0.8,1-1.5,2-2.4,2.9c-1.2,1.4-2.5,2.7-3.8,4c-1.6,1.5-3.4,3-5.3,4.3c-2.9,2-6.2,3.7-9.5,4.8 c-0.7,0.2-0.7,0.3-1.5,0.4c0.7-1.4,1.2-3.1,1.1-5c1.2-0.4,2.4-1,3.6-1.6c5.2-2.6,9.6-6.7,13.2-11.2c3.6-4.5,6.5-9.5,8.9-14.7 c2.4-5.2,4.3-10.5,5.7-16c1.5-5.6,2.6-11.4,3.2-17.2c0.6-5.7,0.8-11.5,0.4-17.3c-0.4-6.3-1.5-12.6-3.6-18.5 c-1.6-4.6-3.9-9.2-7.3-12.8c-3.4-3.7-8-6.3-13.2-6.3c-3.4,0-5.8,2.6-6.5,6c-0.6,2.7,0,6.1,1.7,8.3c0.7,0.8,0.6,1,0.4,1 c-1.5,0-9-1.1-8.3-8.5c0.4-4.8,2.8-7.9,5.4-9.8c2.4-1.5,5.2-1.7,6.3-1.7c1.4,0,2.8,0.1,4.2,0.4c0.5,0,1.2,0.2,1.7,0.4 c0.6,0.2,1.1,0.3,1.7,0.5c1.1,0.4,2.1,0.9,3.1,1.4c2.4,1.3,4.6,3.1,6.4,5c2,2.1,3.7,4.6,5.1,7.2c1.4,2.5,2.5,5.2,3.4,7.9 c1,3,1.8,6,2.3,9.1c0.6,3.1,0.9,6.2,1.2,9.4C210.8,60.6,210.7,66.5,210.2,72.4z"/> <path d="M180.3,54.4v3l0.6-0.1c0,0,0.1,0,0.3,0c0.3,0,0.9,0.1,1.3,0.5c0.4,0.4,0.5,1,0.3,1.8c0,0-6.1,26.3-7.2,31.3 C174.3,84.6,167,50,167,50l0-0.1h-1.4l0,0.2c0,0-5.2,33.7-6.3,40.4c-1.4-5.8-7.2-30.8-7.2-30.8c0-0.2,0-0.3,0-0.5 c0-0.7,0.2-1.2,0.5-1.5c0.4-0.4,1.1-0.4,1.2-0.4l0.6,0.1l0-2.9h-10.1v2.9l0.4,0.1c0.2,0,1.4,0.3,1.5,1.4c0,0,11.9,51,12.4,53.1 l0,0.1h1.8l0-0.2c0.1-0.4,4.9-32,5.8-37.9c1.1,5.9,7.3,37.5,7.4,37.9l0,0.1h1.6L187,58.7c0.3-1.1,1.2-1.2,1.6-1.2c0.1,0,0.1,0,0.1,0 l0.6,0v-3.1H180.3z"/> </svg> </a><a href="https://www.wisconsin.edu/" class="uw-footer-stand-out-link">Part of the Universities of Wisconsin</a></div> </div> <div class="uw-footer-contact"> <h3 class="uw-footer-header">Contact Us</h3><ul class="uw-contact-list"><li class="uw-contact-item uw-contact-address">Physics Department<br /> 2320 Chamberlin Hall<br /> 1150 University Avenue<br /> Madison, WI 53706-1390<br /> </li> <li class="uw-contact-item uw-contact-map-link"> <a href="/department/visit/">Map<svg class="uw-map-marker" viewBox="0 0 585 1024" version="1.1" role="img" focusable="false" aria-labelledby="dynid674f1e243f8803.61894353"> <title id="dynid674f1e243f8803.61894353">map marker</title> <path class="path1" d="M438.857 365.714q0-60.571-42.857-103.429t-103.429-42.857-103.429 42.857-42.857 103.429 42.857 103.429 103.429 42.857 103.429-42.857 42.857-103.429zM585.143 365.714q0 62.286-18.857 102.286l-208 442.286q-9.143 18.857-27.143 29.714t-38.571 10.857-38.571-10.857-26.571-29.714l-208.571-442.286q-18.857-40-18.857-102.286 0-121.143 85.714-206.857t206.857-85.714 206.857 85.714 85.714 206.857z"/> </svg></a></li> <li class="uw-contact-item">Email: <a href="mailto:info@physics.wisc.edu">info@physics.wisc.edu</a></li> <li class="uw-contact-item">Phone: <a href="tel:608-262-4526">608-262-4526</a></li> <li><ul class="uw-social-icons"><li id="uw-icon-twitter" class="uw-social-icon"><a aria-label="twitter" href="https://twitter.com/UWMadPhysics"><svg class="uw-social-symbols" viewBox="0 0 512 512" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e243f8fb0.85225069"> <title id="dynid674f1e243f8fb0.85225069">x twitter</title> <path class="path1" d="M389.2 48h70.6L305.6 224.2 487 464H345L233.7 318.6 106.5 464H35.8L200.7 275.5 26.8 48H172.4L272.9 180.9 389.2 48zM364.4 421.8h39.1L151.1 88h-42L364.4 421.8z"/> </svg></a></li><li id="uw-icon-instagram" class="uw-social-icon"><a aria-label="instagram" href="https://instagram.com/UWMadPhysics"><svg class="uw-social-symbols" viewBox="0 0 448 512" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e243f9583.42576534"> <title id="dynid674f1e243f9583.42576534">instagram</title> <path class="path1" d="M224.1 141c-63.6 0-114.9 51.3-114.9 114.9s51.3 114.9 114.9 114.9S339 319.5 339 255.9 287.7 141 224.1 141zm0 189.6c-41.1 0-74.7-33.5-74.7-74.7s33.5-74.7 74.7-74.7 74.7 33.5 74.7 74.7-33.6 74.7-74.7 74.7zm146.4-194.3c0 14.9-12 26.8-26.8 26.8-14.9 0-26.8-12-26.8-26.8s12-26.8 26.8-26.8 26.8 12 26.8 26.8zm76.1 27.2c-1.7-35.9-9.9-67.7-36.2-93.9-26.2-26.2-58-34.4-93.9-36.2-37-2.1-147.9-2.1-184.9 0-35.8 1.7-67.6 9.9-93.9 36.1s-34.4 58-36.2 93.9c-2.1 37-2.1 147.9 0 184.9 1.7 35.9 9.9 67.7 36.2 93.9s58 34.4 93.9 36.2c37 2.1 147.9 2.1 184.9 0 35.9-1.7 67.7-9.9 93.9-36.2 26.2-26.2 34.4-58 36.2-93.9 2.1-37 2.1-147.8 0-184.8zM398.8 388c-7.8 19.6-22.9 34.7-42.6 42.6-29.5 11.7-99.5 9-132.1 9s-102.7 2.6-132.1-9c-19.6-7.8-34.7-22.9-42.6-42.6-11.7-29.5-9-99.5-9-132.1s-2.6-102.7 9-132.1c7.8-19.6 22.9-34.7 42.6-42.6 29.5-11.7 99.5-9 132.1-9s102.7-2.6 132.1 9c19.6 7.8 34.7 22.9 42.6 42.6 11.7 29.5 9 99.5 9 132.1s2.7 102.7-9 132.1z"/> </svg></a></li><li id="uw-icon-linkedin" class="uw-social-icon"><a aria-label="linkedin" href="https://www.linkedin.com/company/uwmadphysics/"><svg class="uw-social-symbols" viewBox="0 0 448 512" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e243f9b70.76401895"> <title id="dynid674f1e243f9b70.76401895">linkedin</title> <path class="path1" d="M100.28 448H7.4V148.9h92.88zM53.79 108.1C24.09 108.1 0 83.5 0 53.8a53.79 53.79 0 0 1 107.58 0c0 29.7-24.1 54.3-53.79 54.3zM447.9 448h-92.68V302.4c0-34.7-.7-79.2-48.29-79.2-48.29 0-55.69 37.7-55.69 76.7V448h-92.78V148.9h89.08v40.8h1.3c12.4-23.5 42.69-48.3 87.88-48.3 94 0 111.28 61.9 111.28 142.3V448z"/> </svg></a></li><li id="uw-icon-youtube" class="uw-social-icon"><a aria-label="youtube" href="https://www.youtube.com/channel/UCdVkyf-M9Nu39NEEK9sGZ2g/videos"><svg class="uw-social-symbols" viewBox="0 0 576 512" version="1.1" role="img" focusable="false" aria-hidden="true" aria-labelledby="dynid674f1e243fa110.99689201"> <title id="dynid674f1e243fa110.99689201">youtube</title> <path class="path1" d="M549.655 124.083c-6.281-23.65-24.787-42.276-48.284-48.597C458.781 64 288 64 288 64S117.22 64 74.629 75.486c-23.497 6.322-42.003 24.947-48.284 48.597-11.412 42.867-11.412 132.305-11.412 132.305s0 89.438 11.412 132.305c6.281 23.65 24.787 41.5 48.284 47.821C117.22 448 288 448 288 448s170.78 0 213.371-11.486c23.497-6.321 42.003-24.171 48.284-47.821 11.412-42.867 11.412-132.305 11.412-132.305s0-89.438-11.412-132.305zm-317.51 213.508V175.185l142.739 81.205-142.739 81.201z"/> </svg></a></li></ul></li></ul></div> </div> <div class="uw-copyright"> <p>Website feedback, questions or accessibility issues: <a id="uw-website-issues-contact" href="mailto:it-staff@physics.wisc.edu">it-staff@physics.wisc.edu</a>.</p> <p>Learn more about <a href="https://accessible.wisc.edu/">accessibility at UW–Madison</a>.</p> <p>This site was built using the <a href="https://uwtheme.wordpress.wisc.edu/">UW Theme</a> | <a href="https://www.wisc.edu/privacy-notice/">Privacy Notice</a> | © 2024 Board of Regents of the <a href="https://www.wisconsin.edu">University of Wisconsin System.</a> </p> </div> </footer> <!-- Instagram Feed JS --> <script type="text/javascript"> var sbiajaxurl = "https://www.physics.wisc.edu/wp-admin/admin-ajax.php"; </script> <script> var e = document.getElementsByClassName("uw-global-bar"); var site_url = "https://www.physics.wisc.edu"; if( e.length ) { var breadcrumbs = '<span class="website-breadcrumbs"> : <a class="uw-global-name-link" href="https://www.physics.wisc.edu">physics</a>'; // add a link to the top site for this domain (e.g. www.hep.wisc.edu) var domain_re = /.*:\/\/([^\/]*)/; var match = domain_re.exec(site_url); if( match.length > 1 ) { var domain = match[1]; var domain_parts = domain.split("."); var site_part = 0; if( domain_parts[site_part] == "www" ) site_part += 1; if( domain_parts[site_part] == "wp" ) site_part += 1; if( domain_parts[site_part] == "home" ) site_part += 1; if( domain_parts[site_part] != "physics" ) { breadcrumbs += ' : <a class="uw-global-name-link" href="https://' + domain + '">' + domain_parts[site_part] + '</a>'; } } // add a link to this sub-site (e.g. www.hep.wisc.edu/cms) var n = site_url.lastIndexOf("/"); var subsite = site_url.substr(n+1); if( subsite.lastIndexOf(".") < 0 ) { breadcrumbs += ' : <a class="uw-global-name-link" href="' + site_url + '">' + subsite + '</a>'; } e[0].innerHTML = "<span>" + e[0].innerHTML + breadcrumbs + "</span></span>"; } </script> <script> var menu; menu = document.getElementById('menu-item-3698'); if( menu ) { var html = menu.innerHTML; if( html.indexOf("Graduate") >= 0 ) { menu.innerHTML = html.replace("Graduate","Grad<span class='show-for-large show-for-stacked'>uate</span>"); } } menu = document.getElementById('menu-item-3188'); if( menu ) { var html = menu.innerHTML; if( html.indexOf("Undergraduate") >= 0 ) { menu.innerHTML = html.replace("Undergraduate","Undergrad<span class='show-for-large show-for-stacked'>uate</span>"); } } </script><script src="https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/js/jquery/jquery.min.js?ver=3.6.0" id="jquery-js"></script> <script src="https://www.physics.wisc.edu/wp-includes/js/jquery/ui/effect.min.js?ver=1.13.3" id="jquery-effects-core-js"></script> <script src="https://www.physics.wisc.edu/wp-includes/js/jquery/ui/effect-slide.min.js?ver=1.13.3" id="jquery-effects-slide-js"></script> <script src="https://www.physics.wisc.edu/wp-includes/js/jquery/ui/effect-highlight.min.js?ver=1.13.3" id="jquery-effects-highlight-js"></script> <script src="https://www.physics.wisc.edu/wp-includes/js/jquery/ui/effect-fold.min.js?ver=1.13.3" id="jquery-effects-fold-js"></script> <script src="https://www.physics.wisc.edu/wp-includes/js/jquery/ui/effect-blind.min.js?ver=1.13.3" id="jquery-effects-blind-js"></script> <script id="bg-show-hide-script-js-extra"> var BG_SHCE_USE_EFFECTS = "0"; var BG_SHCE_TOGGLE_SPEED = "400"; var BG_SHCE_TOGGLE_OPTIONS = "none"; var BG_SHCE_TOGGLE_EFFECT = "blind"; </script> <script src="https://www.physics.wisc.edu/wp-content/plugins/show-hidecollapse-expand/assets/js/bg-show-hide.js?ver=6.7.1" id="bg-show-hide-script-js"></script> <!--[if lt IE 10]> <script src="https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/js/polyfills/classList.js?ver=1.0.0" id="uwmadison-ie-js"></script> <![endif]--> <script src="https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/main.min.js?ver=1.35.1" id="uwmadison-script-js"></script> <script src="https://www.physics.wisc.edu/wp-content/themes/uw-theme/dist/js/jquery-migrate/jquery-migrate.min.js?ver=3.4.0" id="jquery-migrate-js"></script> <script src="https://cdn.wisc.cloud/cookie-consent/1.1.0/uwcookieconsent.min.js?ver=1.1.0" id="uw-cookie-consent-js"></script> <script id="uw-cookie-consent-js-after"> window.addEventListener("load", function(){window.cookieconsent.initialize()}); </script> </body> </html>