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.addSize([768, 0], [[728, 90]]) // Smaller (laptop) screen ads .addSize([0, 0], [[300, 250], [320, 50]]) // Mobile screen ads .build(); // Homepage & listing ads const t_1 = defineIfSlot('/21821800277/pw/pw_t_hp', [[970,90],[728,90],[729,90],[300,250],[320,50]], 'div-gpt-ad-3759129-18', pubads); const t_2 = defineIfSlot('/21821800277/pw/pw_t1_hp', [[970,90],[728,90],[729,90],[300,250],[320,50]], 'div-gpt-ad-3759129-19', pubads); const t_3 = defineIfSlot('/21821800277/pw/pw_t2_hp', [[970,90],[728,90],[729,90],[300,250],[320,50]], 'div-gpt-ad-3759129-20', pubads); // Only map if they actually exist t_1 && t_1.defineSizeMapping(leaderboard); t_2 && t_2.defineSizeMapping(leaderboard); t_3 && t_3.defineSizeMapping(leaderboard); // Search results const headerSize = googletag.sizeMapping() .addSize([970, 0], [[970, 90]]) .addSize([0, 0], [[320, 50]]) .build() // Header ad (always appears) googletag.defineSlot('/21821800277/pw/pw_h_sw', [[970,90], [320, 50]], 'div-gpt-ad-5400963-20').defineSizeMapping(headerSize).addService(pubads); // Only apply targeting if values exist const article_og = getOgType(); if ( article_og ) { pubads.setTargeting( "articleTag", article_og ); } const article_type = getMetaContent( "oas:article-type" ); if ( article_type ) { pubads.setTargeting( "articleType", article_type ); } const article_category = getMetaContent( "oas:category" ); if ( article_category ) { pubads.setTargeting( "category", article_category ); } const article_sub = getMetaContent( "oas:sub-category" ); if ( article_sub ) { pubads.setTargeting( "subCategory", article_sub ); } // Add class to body if ads are visible pubads.addEventListener( "impressionViewable", function () { document.body.classList.add("has-ads"); }); pubads.enableSingleRequest(); pubads.collapseEmptyDivs(); // Start! googletag.enableServices(); }); </script>  </head> <body class="archive category category-particle-nuclear category-176 not-logged-in"> <a class="sr-only" 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To sign up, go to <a href="https://physicsworld.com/p/account/">My account</a> then click on "My alerts".</p> </div> <div class="wrapper m26"> <div class="section-breaks"> <h2 class="section-breaks__heading">Editor's choice</h2> </div> <div class="row"> <div class='col-md-8 col-sm-7'> <article class="article article--f"> <a href="https://physicsworld.com/a/nuclear-shapes-revealed-in-high-energy-collisions/" class="article__image object-fit-element"> <img width="651" height="412" src="https://physicsworld.com/wp-content/uploads/2024/11/18-11-2024-RHIC-collisions-651x412.jpg" class="attachment-featured-category-medium size-featured-category-medium wp-post-image" alt="RHIC collisions" decoding="async" srcset="https://physicsworld.com/wp-content/uploads/2024/11/18-11-2024-RHIC-collisions-651x412.jpg 651w, https://physicsworld.com/wp-content/uploads/2024/11/18-11-2024-RHIC-collisions-211x134.jpg 211w, https://physicsworld.com/wp-content/uploads/2024/11/18-11-2024-RHIC-collisions-317x201.jpg 317w, https://physicsworld.com/wp-content/uploads/2024/11/18-11-2024-RHIC-collisions-632x400.jpg 632w, https://physicsworld.com/wp-content/uploads/2024/11/18-11-2024-RHIC-collisions-648x410.jpg 648w, https://physicsworld.com/wp-content/uploads/2024/11/18-11-2024-RHIC-collisions-635x402.jpg 635w, https://physicsworld.com/wp-content/uploads/2024/11/18-11-2024-RHIC-collisions-311x197.jpg 311w, https://physicsworld.com/wp-content/uploads/2024/11/18-11-2024-RHIC-collisions-257x163.jpg 257w, https://physicsworld.com/wp-content/uploads/2024/11/18-11-2024-RHIC-collisions-300x190.jpg 300w, https://physicsworld.com/wp-content/uploads/2024/11/18-11-2024-RHIC-collisions-142x90.jpg 142w, https://physicsworld.com/wp-content/uploads/2024/11/18-11-2024-RHIC-collisions-128x81.jpg 128w, https://physicsworld.com/wp-content/uploads/2024/11/18-11-2024-RHIC-collisions.jpg 700w" sizes="(max-width: 651px) 100vw, 651px" /> <span class="icon icon--research-updates"></span> </a> <div class="article__info"> <ul 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srcset="https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24-618x412.jpg 618w, https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24-211x141.jpg 211w, https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24-1024x683.jpg 1024w, https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24-317x211.jpg 317w, https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24-768x512.jpg 768w, https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24-600x400.jpg 600w, https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24-615x410.jpg 615w, https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24-635x423.jpg 635w, https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24-296x197.jpg 296w, https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24-257x171.jpg 257w, https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24-300x200.jpg 300w, https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24-135x90.jpg 135w, https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24-128x85.jpg 128w, https://physicsworld.com/wp-content/uploads/2024/11/Mark-Thomson-06_11_24.jpg 1080w" sizes="(max-width: 618px) 100vw, 618px" /> <span class="icon icon--news"></span> </a> <div class="article__info"> <ul class="hero-top-banner__category category--has-background-color"> <li><a href="https://physicsworld.com/c/particle-nuclear/" style="background: #764992;">Particle and nuclear</a></li> <li><a href="https://physicsworld.com/l/news/" style="background: #764992;">News</a></li> </ul> <h3 class="article__title"> <a href="https://physicsworld.com/a/uk-particle-physicist-mark-thomson-selected-as-next-cern-boss/"> <span>UK particle physicist Mark Thomson selected as next CERN boss</span> </a> </h3> <p>Thomson will become the 17th director-general of the CERN particle-physics laboratory when he takes up the position in 2026</p> </div> </article> <article class="listing-block no-image"> <div class="listing-block__info"> <ul class="hero-top-banner__category"> <li><a href="https://physicsworld.com/c/particle-nuclear/nuclear-physics/" style="color: #764992;">Nuclear physics</a></li> <li><a href="https://physicsworld.com/l/research-updates/" style="color: #764992;">Research update</a></li> </ul> <h3 class="listing-block__title"> <a href="https://physicsworld.com/a/physicists-propose-new-solution-to-the-neutron-lifetime-puzzle/" title="Physicists propose new solution to the neutron lifetime puzzle"> <b>Physicists propose new solution to the neutron lifetime puzzle</b> </a> </h3> <p>Different neutron states could explain why different experiments produce different figures for how long neutrons survive before decaying</p> </div> </article> </div> </div> </div> <div class="banner-ad"> <span class="mpu align-none" aria-hidden="true"><div id='div-gpt-ad-3759129-18' class="advert" > <script> googletag.cmd.push(function() { googletag.display('div-gpt-ad-3759129-18'); }); </script> </div></span></div> <div class="wrapper m2">  <div class="section-breaks"> <h2 class="section-breaks__heading">Particle and nuclear news</h2> </div> <div class="row"> <div class="col-md-4 col-xs-6"> <article class="article article--a"> <a href="https://physicsworld.com/a/cern-celebrates-70-years-at-the-helm-of-particle-physics-in-lavish-ceremony/" class="article__image object-fit-element"> <img width="295" height="197" src="https://physicsworld.com/wp-content/uploads/2024/10/10-Family-photo-CERN-small-295x197.jpg" class="attachment-1-3-cols size-1-3-cols wp-post-image" alt="Delegates at CERN @70 event" decoding="async" srcset="https://physicsworld.com/wp-content/uploads/2024/10/10-Family-photo-CERN-small-295x197.jpg 295w, https://physicsworld.com/wp-content/uploads/2024/10/10-Family-photo-CERN-small-211x141.jpg 211w, 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