Nuclear charge radius of $^{26m}$Al and its implication for V$_{ud}$ in the quark-mixing matrix

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">     <html xmlns="http://www.w3.org/1999/xhtml" lang="fr" xml:lang="fr" xmlns:og="http://ogp.me/ns#" xmlns:fb="http://ogp.me/ns/fb#"> <head> <title>Nuclear charge radius of $^{26m}$Al and its implication for V$_{ud}$ in the quark-mixing matrix - CERN Document Server</title> <link href='https://framework.web.cern.ch/framework/2.0/fonts/PTSansWeb/PTSansWeb.css' rel='stylesheet' type='text/css' /> <link rel="stylesheet" href="https://cds.cern.ch/img/invenio.css?v=20141127" type="text/css" /> <link rel="stylesheet" href="https://cds.cern.ch/img/cern_theme/css/cern_theme.css?v=20141127" type="text/css" /> <link rel="stylesheet"href="/css/font-awesome.min.css"> <meta http-equiv="X-UA-Compatible" content="IE=Edge"/> <link rel="stylesheet" href="https://cds.cern.ch/img/cern_toolbar/css/toolbar.css" type="text/css" />    <link rel="canonical" href="https://cds.cern.ch/record/2876995" /> <link rel="alternate" hreflang="el" href="https://cds.cern.ch/record/2876995?ln=el" /> <link rel="alternate" hreflang="fr" href="https://cds.cern.ch/record/2876995?ln=fr" /> <link rel="alternate" hreflang="bg" href="https://cds.cern.ch/record/2876995?ln=bg" /> <link rel="alternate" hreflang="zh-TW" href="https://cds.cern.ch/record/2876995?ln=zh_TW" /> <link rel="alternate" hreflang="pt" href="https://cds.cern.ch/record/2876995?ln=pt" /> <link rel="alternate" hreflang="no" href="https://cds.cern.ch/record/2876995?ln=no" /> <link rel="alternate" hreflang="hr" href="https://cds.cern.ch/record/2876995?ln=hr" /> <link rel="alternate" hreflang="ca" href="https://cds.cern.ch/record/2876995?ln=ca" /> <link rel="alternate" hreflang="de" href="https://cds.cern.ch/record/2876995?ln=de" /> <link rel="alternate" hreflang="it" href="https://cds.cern.ch/record/2876995?ln=it" /> <link rel="alternate" hreflang="zh-CN" href="https://cds.cern.ch/record/2876995?ln=zh_CN" /> <link rel="alternate" hreflang="sv" href="https://cds.cern.ch/record/2876995?ln=sv" /> <link rel="alternate" hreflang="sk" href="https://cds.cern.ch/record/2876995?ln=sk" /> <link rel="alternate" hreflang="en" href="https://cds.cern.ch/record/2876995?ln=en" /> <link rel="alternate" hreflang="pl" href="https://cds.cern.ch/record/2876995?ln=pl" /> <link rel="alternate" hreflang="ru" href="https://cds.cern.ch/record/2876995?ln=ru" /> <link rel="alternate" hreflang="ka" href="https://cds.cern.ch/record/2876995?ln=ka" /> <link rel="alternate" hreflang="ja" href="https://cds.cern.ch/record/2876995?ln=ja" /> <link rel="alternate" hreflang="es" href="https://cds.cern.ch/record/2876995?ln=es" /> <link rel="alternate" type="application/rss+xml" title="CERN Document Server RSS" href="/rss?ln=fr" /> <link rel="search" type="application/opensearchdescription+xml" href="https://cds.cern.ch/opensearchdescription" title="CERN Document Server" /> <link rel="unapi-server" type="application/xml" title="unAPI" href="https://cds.cern.ch/unapi" /> <link rel="apple-touch-icon" href="/apple-touch-icon.png"/> <link rel="apple-touch-icon-precomposed" href="/apple-touch-icon-precomposed.png"/> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="fr" /> <meta name="description" content="Collinear laser spectroscopy was performed on the isomer of the aluminium isotope <math display="inline"><mrow><mmultiscripts><mrow><mi>Al</mi></mrow><mprescripts/><none/><mrow><mn>26</mn><mi>m</mi></mrow></mmultiscripts></mrow></math>. The measured isotope shift to <math display="inline"><mrow><mmultiscripts><mrow><mi>Al</mi></mrow><mprescripts/><none/><mrow><mn>27</mn></mrow></mmultiscripts></mrow></math> in the <math display="inline"><mrow><mn>3</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup><mn>3</mn><mi>p</mi><mtext> </mtext><mmultiscripts><mrow><msubsup><mrow><mi>P</mi></mrow><mrow><mn>3</mn><mo>/</mo><mn>2</mn></mrow><mrow><mi>○</mi></mrow></msubsup></mrow><mprescripts/><none/><mrow><mn>2</mn></mrow></mmultiscripts><mo stretchy="false">→</mo><mn>3</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup><mn>4</mn><mi>s</mi><mtext> </mtext><mmultiscripts><mrow><msub><mrow><mi>S</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow><mprescripts/><none/><mrow><mn>2</mn></mrow></mmultiscripts></mrow></math> atomic transition enabled the first experimental determination of the nuclear charge radius of <math display="inline"><mrow><mmultiscripts><mrow><mi>Al</mi></mrow><mprescripts/><none/><mrow><mn>26</mn><mi>m</mi></mrow></mmultiscripts></mrow></math>, resulting in <math display="inline"><mrow><msub><mrow><mi>R</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>=</mo><mrow><mn>3.130</mn><mo stretchy="false">(</mo><mn>15</mn><mo stretchy="false">)</mo><mtext> </mtext><mtext> </mtext><mi>fm</mi></mrow></mrow></math>. This differs by 4.5 standard deviations from the extrapolated value used to calculate the isospin-symmetry breaking corrections in the superallowed <math display="inline"><mi>β</mi></math> decay of <math display="inline"><mrow><mmultiscripts><mrow><mi>Al</mi></mrow><mprescripts/><none/><mrow><mn>26</mn><mi>m</mi></mrow></mmultiscripts></mrow></math>. Its corrected <math display="inline"><mi mathvariant="script">F</mi><mi>t</mi></math> value, important for the estimation of <math display="inline"><msub><mi>V</mi><mrow><mi>u</mi><mi>d</mi></mrow></msub></math> in the Cabibbo-Kobayashi-Maskawa matrix, is thus shifted by 1 standard deviation to 3071.4(1.0) s. Collinear laser spectroscopy was performed on the isomer of the aluminium isotope $^{26m}$Al. The measured isotope shift to $^{27}$Al in the $3s^{2}3p\;^{2}\!P^\circ_{3/2} \rightarrow 3s^{2}4s\;^{2}\!S_{1/2}$ atomic transition enabled the first experimental determination of the nuclear charge radius of $^{26m}$Al, resulting in $R_c$=\qty{3.130±.015}{\femto\meter}. This differs by 4.5 standard deviations from the extrapolated value used to calculate the isospin-symmetry breaking corrections in the superallowed $\beta$ decay of $^{26m}$Al. Its corrected $\mathcal{F}t$ value, important for the estimation of $V_{ud}$ in the CKM matrix, is thus shifted by one standard deviation to \qty{3071.4±1.0}{\second}. Plattner, P.; Wood, E.; Ayoubi, L. Al; Beliuskina, O.; Bissell, M.L.; Blaum, K.; Campbell, P.; Cheal, B.; de Groote, R.P.; Devlin, C.S.; Eronen, T.; Filippin, L.; García Ruíz, R.F.; Ge, Z.; Geldhof, S.; Gins, W.; Godefroid, M.; Heylen, H.; Hukkanen, M.; Imgram, P.; Jaries, A.; Jokinen, A.; Kanellakopoulos, A.; Kankainen, A.; Kaufmann, S.; König, K.; Koszorús, Á.; Kujanpää, S.; Lechner, S.; Malbrunot-Ettenauer, S.; Müller, P.; Mathieson, R.; Moore, I.; Nörtershäuser, W.; Nesterenko, D.; Neugart, R.; Neyens, G.; Ortiz-Cortes, A.; Penttilä, H.; Pohjalainen, I.; Raggio, A.; Reponen, M.; Rinta-Antila, S.; Rodríguez, L.V.; Romero, J.; Sánchez, R.; Sommer, F.; Stryjczyk, M.; Virtanen, V.; Xie, L.; Xu, Z.Y.; Yang, X.F.; Yordanov, D.T." /> <meta name="keywords" content="CERN Document Server, WebSearch, CERN Document Server" /> <script type="text/javascript" src="https://cds.cern.ch/js/jquery.min.js"></script>  <link rel="stylesheet" href="https://cds.cern.ch/img/webnews.css" type="text/css" />  <script type="text/javascript" src="https://cds.cern.ch/js/webnews.js?v=20131009"></script> <meta property="fb:app_id" content="137353533001720"/> <script type="text/x-mathjax-config"> MathJax.Hub.Config({ tex2jax: {inlineMath: [['$','$']], processEscapes: true}, showProcessingMessages: false, messageStyle: "none" }); </script> <script src="/MathJax/MathJax.js?config=TeX-AMS_CHTML" type="text/javascript"> </script>  <meta content="arXiv : Nuclear charge radius of $^{26m}$Al and its implication for V$_{ud}$ in the quark-mixing matrix" name="citation_title" /> <meta content="Plattner, P." name="citation_author" /> <meta content="Raggio, A." name="citation_author" /> <meta content="Kankainen, A." name="citation_author" /> <meta content="Nesterenko, D." name="citation_author" /> <meta content="Rinta-Antila, S." name="citation_author" /> <meta content="Geldhof, S." name="citation_author" /> <meta content="Kujanpää, S." name="citation_author" /> <meta content="Reponen, M." name="citation_author" /> <meta content="Lechner, S." name="citation_author" /> <meta content="de Groote, R.P." name="citation_author" /> <meta content="Yang, X.F." name="citation_author" /> <meta content="Romero, J." name="citation_author" /> <meta content="Wood, E." name="citation_author" /> <meta content="Neugart, R." name="citation_author" /> <meta content="Filippin, L." name="citation_author" /> <meta content="Campbell, P." name="citation_author" /> <meta content="Blaum, K." name="citation_author" /> <meta content="Moore, I." name="citation_author" /> <meta content="Pohjalainen, I." name="citation_author" /> <meta content="Xie, L." name="citation_author" /> <meta content="Heylen, H." name="citation_author" /> <meta content="Xu, Z.Y." name="citation_author" /> <meta content="Jaries, A." name="citation_author" /> <meta content="Rodríguez, L.V." name="citation_author" /> <meta content="Mathieson, R." name="citation_author" /> <meta content="Penttilä, H." name="citation_author" /> <meta content="Stryjczyk, M." name="citation_author" /> <meta content="Eronen, T." name="citation_author" /> <meta content="Devlin, C.S." name="citation_author" /> <meta content="Ortiz-Cortes, A." name="citation_author" /> <meta content="Bissell, M.L." name="citation_author" /> <meta content="Malbrunot-Ettenauer, S." name="citation_author" /> <meta content="König, K." name="citation_author" /> <meta content="Gins, W." name="citation_author" /> <meta content="Ge, Z." name="citation_author" /> <meta content="Sommer, F." name="citation_author" /> <meta content="Cheal, B." name="citation_author" /> <meta content="Beliuskina, O." name="citation_author" /> <meta content="Yordanov, D.T." name="citation_author" /> <meta content="Ayoubi, L. 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The measured isotope shift to Al27 in the 3s23p P3/2○2→3s24s S1/22 atomic transition enabled the first experimental determination of the nuclear charge radius of Al26m, resulting in Rc=3.130(15) fm. This differs by 4.5 standard deviations from the extrapolated value used to calculate the isospin-symmetry breaking corrections in the superallowed β decay of Al26m. Its corrected Ft value, important for the estimation of Vud in the Cabibbo-Kobayashi-Maskawa matrix, is thus shifted by 1 standard deviation to 3071.4(1.0) s." property="og:description" /> <meta content="Collinear laser spectroscopy was performed on the isomer of the aluminium isotope $^{26m}$Al. The measured isotope shift to $^{27}$Al in the $3s^{2}3p\;^{2}\!P^\circ_{3/2} \rightarrow 3s^{2}4s\;^{2}\!S_{1/2}$ atomic transition enabled the first experimental determination of the nuclear charge radius of $^{26m}$Al, resulting in $R_c$=\qty{3.130±.015}{\femto\meter}. This differs by 4.5 standard deviations from the extrapolated value used to calculate the isospin-symmetry breaking corrections in the superallowed $\beta$ decay of $^{26m}$Al. 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var link = document.getElementById('link'); var extension = document.getElementById('extension'); if (more.style.display=='none'){ more.style.display = ''; extension.style.display = 'none'; link.innerHTML = "Masquer" } else { more.style.display = 'none'; extension.style.display = ''; link.innerHTML = "Afficher les 53 auteurs" } link.style.color = "rgb(204,0,0);" } function set_up(){ var extension = document.getElementById('extension'); extension.innerHTML = ""; toggle_authors_visibility(); } </script> <a name="show_hide" /><a href="https://cds.cern.ch/search?f=author&p=Plattner%2C%20P.&ln=fr">Plattner, P.</a> (CERN ; Innsbruck U. ; Heidelberg, Max Planck Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Wood%2C%20E.&ln=fr">Wood, E.</a> (Liverpool U.) ; <a href="https://cds.cern.ch/search?f=author&p=Ayoubi%2C%20L.%20Al&ln=fr">Ayoubi, L. Al</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Beliuskina%2C%20O.&ln=fr">Beliuskina, O.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Bissell%2C%20M.L.&ln=fr">Bissell, M.L.</a> (Manchester U. ; CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Blaum%2C%20K.&ln=fr">Blaum, K.</a> (Heidelberg, Max Planck Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Campbell%2C%20P.&ln=fr">Campbell, P.</a> (Manchester U.) ; <a href="https://cds.cern.ch/search?f=author&p=Cheal%2C%20B.&ln=fr">Cheal, B.</a> (Liverpool U.) ; <a href="https://cds.cern.ch/search?f=author&p=de%20Groote%2C%20R.P.&ln=fr">de Groote, R.P.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Devlin%2C%20C.S.&ln=fr">Devlin, C.S.</a> (Liverpool U.)<span id="more" style=""> ; <a href="https://cds.cern.ch/search?f=author&p=Eronen%2C%20T.&ln=fr">Eronen, T.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Filippin%2C%20L.&ln=fr">Filippin, L.</a> (Brussels U.) ; <a href="https://cds.cern.ch/search?f=author&p=Garc%C3%ADa%20Ru%C3%ADz%2C%20R.F.&ln=fr">García Ruíz, R.F.</a> (CERN ; MIT) ; <a href="https://cds.cern.ch/search?f=author&p=Ge%2C%20Z.&ln=fr">Ge, Z.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Geldhof%2C%20S.&ln=fr">Geldhof, S.</a> (KU Leuven, Dept. Phys. Astron.) ; <a href="https://cds.cern.ch/search?f=author&p=Gins%2C%20W.&ln=fr">Gins, W.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Godefroid%2C%20M.&ln=fr">Godefroid, M.</a> (Brussels U.) ; <a href="https://cds.cern.ch/search?f=author&p=Heylen%2C%20H.&ln=fr">Heylen, H.</a> (CERN ; Heidelberg, Max Planck Inst.) ; <a href="https://cds.cern.ch/search?f=author&p=Hukkanen%2C%20M.&ln=fr">Hukkanen, M.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Imgram%2C%20P.&ln=fr">Imgram, P.</a> (Darmstadt, Tech. U.) ; <a href="https://cds.cern.ch/search?f=author&p=Jaries%2C%20A.&ln=fr">Jaries, A.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Jokinen%2C%20A.&ln=fr">Jokinen, A.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Kanellakopoulos%2C%20A.&ln=fr">Kanellakopoulos, A.</a> (KU Leuven, Dept. Phys. Astron.) ; <a href="https://cds.cern.ch/search?f=author&p=Kankainen%2C%20A.&ln=fr">Kankainen, A.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Kaufmann%2C%20S.&ln=fr">Kaufmann, S.</a> (Darmstadt, Tech. U.) ; <a href="https://cds.cern.ch/search?f=author&p=K%C3%B6nig%2C%20K.&ln=fr">König, K.</a> (Darmstadt, Tech. U.) ; <a href="https://cds.cern.ch/search?f=author&p=Koszor%C3%BAs%2C%20%C3%81.&ln=fr">Koszorús, Á.</a> (Liverpool U. ; KU Leuven, Dept. Phys. Astron.) ; <a href="https://cds.cern.ch/search?f=author&p=Kujanp%C3%A4%C3%A4%2C%20S.&ln=fr">Kujanpää, S.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Lechner%2C%20S.&ln=fr">Lechner, S.</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Malbrunot-Ettenauer%2C%20S.&ln=fr">Malbrunot-Ettenauer, S.</a> (Baskent U. ; CERN ; TRIUMF) ; <a href="https://cds.cern.ch/search?f=author&p=M%C3%BCller%2C%20P.&ln=fr">Müller, P.</a> (Darmstadt, Tech. U.) ; <a href="https://cds.cern.ch/search?f=author&p=Mathieson%2C%20R.&ln=fr">Mathieson, R.</a> (Liverpool U.) ; <a href="https://cds.cern.ch/search?f=author&p=Moore%2C%20I.&ln=fr">Moore, I.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=N%C3%B6rtersh%C3%A4user%2C%20W.&ln=fr">Nörtershäuser, W.</a> (Darmstadt, Tech. U.) ; <a href="https://cds.cern.ch/search?f=author&p=Nesterenko%2C%20D.&ln=fr">Nesterenko, D.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Neugart%2C%20R.&ln=fr">Neugart, R.</a> (Heidelberg, Max Planck Inst. ; Los Alamos ; Arizona U. ; Mainz U., Inst. Kernphys.) ; <a href="https://cds.cern.ch/search?f=author&p=Neyens%2C%20G.&ln=fr">Neyens, G.</a> (CERN ; KU Leuven, Dept. Phys. Astron.) ; <a href="https://cds.cern.ch/search?f=author&p=Ortiz-Cortes%2C%20A.&ln=fr">Ortiz-Cortes, A.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Penttil%C3%A4%2C%20H.&ln=fr">Penttilä, H.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Pohjalainen%2C%20I.&ln=fr">Pohjalainen, I.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Raggio%2C%20A.&ln=fr">Raggio, A.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Reponen%2C%20M.&ln=fr">Reponen, M.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Rinta-Antila%2C%20S.&ln=fr">Rinta-Antila, S.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Rodr%C3%ADguez%2C%20L.V.&ln=fr">Rodríguez, L.V.</a> (Heidelberg, Max Planck Inst. ; CERN ; IJCLab, Orsay) ; <a href="https://cds.cern.ch/search?f=author&p=Romero%2C%20J.&ln=fr">Romero, J.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=S%C3%A1nchez%2C%20R.&ln=fr">Sánchez, R.</a> (Darmstadt, GSI) ; <a href="https://cds.cern.ch/search?f=author&p=Sommer%2C%20F.&ln=fr">Sommer, F.</a> (Darmstadt, Tech. U.) ; <a href="https://cds.cern.ch/search?f=author&p=Stryjczyk%2C%20M.&ln=fr">Stryjczyk, M.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Virtanen%2C%20V.&ln=fr">Virtanen, V.</a> (Jyvaskyla U.) ; <a href="https://cds.cern.ch/search?f=author&p=Xie%2C%20L.&ln=fr">Xie, L.</a> (Manchester U.) ; <a href="https://cds.cern.ch/search?f=author&p=Xu%2C%20Z.Y.&ln=fr">Xu, Z.Y.</a> (KU Leuven, Dept. Phys. Astron.) ; <a href="https://cds.cern.ch/search?f=author&p=Yang%2C%20X.F.&ln=fr">Yang, X.F.</a> (KU Leuven, Dept. Phys. Astron. ; Peking U.) ; <a href="https://cds.cern.ch/search?f=author&p=Yordanov%2C%20D.T.&ln=fr">Yordanov, D.T.</a> (IJCLab, Orsay)</span> <span id="extension"></span> <small><i><a id="link" href="#" onclick="toggle_authors_visibility()" style="color:rgb(204,0,0);"></a></i></small><script type="text/javascript">set_up()</script></td></tr> <tr><td class="formatRecordLabel"> Publication </td><td style="padding-left:5px;">2023-11-27</td></tr> <tr><td class="formatRecordLabel"> Imprint </td><td style="padding-left:5px;">2023-10-23</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">7</td></tr> <tr><td class="formatRecordLabel"> In: </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.1103/PhysRevLett.131.222502"><i>Phys. Rev. Lett.</i> 131 (2023) 222502</a> </a></td></tr> <tr><td class="formatRecordLabel"> DOI </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.1103/PhysRevLett.131.222502" title="DOI" target="_blank">10.1103/PhysRevLett.131.222502</a> (publication) <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">nucl-ex ; Nuclear Physics - Experiment</td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">Collinear laser spectroscopy was performed on the isomer of the aluminium isotope $^{26m}$Al. The measured isotope shift to $^{27}$Al in the $3s^{2}3p\;^{2}\!P^\circ_{3/2} \rightarrow 3s^{2}4s\;^{2}\!S_{1/2}$ atomic transition enabled the first experimental determination of the nuclear charge radius of $^{26m}$Al, resulting in $R_c$=\qty{3.130±.015}{\femto\meter}. This differs by 4.5 standard deviations from the extrapolated value used to calculate the isospin-symmetry breaking corrections in the superallowed $\beta$ decay of $^{26m}$Al. Its corrected $\mathcal{F}t$ value, important for the estimation of $V_{ud}$ in the CKM matrix, is thus shifted by one standard deviation to \qty{3071.4±1.0}{\second}.</td></tr> <tr><td class="formatRecordLabel"> Copyright/License </td><td style="padding-left:5px;">publication: © 2023-2025 authors (License: <a href="https://creativecommons.org/licenses/by/4.0/">CC-BY-4.0</a>)<br/>preprint: (License: <a href="http://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>)</td></tr> </table> <br /><div style="max-width:1024px;margin:auto"><div style="overflow-x:auto;display:inline;width:100%;"><a href="/record/2876995/plots#0"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2876995/files/aluminium_example_spectra.png" title=" \textbf{(a)} Example of a resonance spectrum of the main spectroscopic transition $3s^{2}3p\;^{2}\!P^\circ_{3/2} \rightarrow 3s^{2}4s\;^{2}\!S_{1/2}$ obtained in the CLS measurements of $^{26,26m}$Al at IGISOL. The inset demonstrates the isomer's presence (red) due to well separated ground and isomer states in the $3s^{2}3p\;^{2}\!P^\circ_{1/2} \rightarrow 3s^{2}3d\;^{2}\!D_{3/2}$ transition. \textbf{(b,c)} The spectra of $^{26,26m}$Al in the main transition at COLLAPS. Ions have been extracted \qty{0}{\second} (b) and \qty{6}{\second} (c) after the proton impact on the ISOLDE target, demonstrating the isomer's presence due to the decrease in intensity consistent with the isomer's half-life. \textbf{(d,e)} Examples of resonance spectra of the $^{27}$Al references studied using the main transition at IGISOL (d) and COLLAPS (e). \textbf{f)} Extracted isotope shifts (points) and the resulting weighted average (a horizontal line), including systematic uncertainties." width="200px"/></a> <a href="/record/2876995/plots#1"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2876995/files/aluminium_Ft_mean_shift.png" title=" \textbf{(a)} $\mathcal{F}t$ values of the 15 superallowed $\beta$ emitters used to determine V$_{ud}$. The values in black, taken from \cite{PhysRevC.102.045501}, include experimental as well as `statistical' theoretical errors. The previously determined $\mathcal{F}t$ value for $^{26m}$Al \cite{PhysRevC.102.045501} (blue) is compared to the one (orange) when considering the experimental nuclear charge radius of the present work. The weighted averages for the 15 superallowed $\beta$ emitters are shown as horizontal bars in the inset (without considering additional, systematic theoretical uncertainties). \textbf{(b)} Evolution of the $\overline{\mathcal{F}t}$ value with statistical uncertainties in previous reviews \cite{HARDY1990429, Towner_1995, towner1998current, PhysRevLett.94.092502, PhysRevC.79.055502, PhysRevC.91.025501, PhysRevC.102.045501} (black) compared to this work (orange). The vertical line to guide the eye corresponds to the value from 2020 \cite{PhysRevC.102.045501}." width="200px"/></a> </div></div><br /> <br/>Corresponding record in: <a href="http://inspirehep.net/record/2713613">Inspire</a> <small> </small> <br/> <br/><br/><div align="right"><div style="padding-bottom:2px;padding-top:30px;"><span class="moreinfo" style="margin-right:10px;"> <a href="" class="moreinfo">Retour à la recherche</a> </span></div></div> <div class="bottom-left-folded"><div class="recordlastmodifiedbox" style="position:relative;margin-left:1px"> Notice créée le 2023-10-26, modifiée le 2024-10-01</div></div> <div class="bottom-right-folded" style="text-align:right;padding-bottom:2px;"> <span class="moreinfo" style="margin-right:10px;"></span></div> </div> </div> </div> <br/> <br /> <div class="detailedrecordminipanel"> <div class="top-left"></div><div class="top-right"></div> <div class="inside"> <div id="detailedrecordminipanelfile" style="width:33%;float:left;text-align:center;margin-top:0"> <div><small class="detailedRecordActions">Fichiers:</small> <br /><em>2310.15291</em> - <a href="/record/2876995/files/2310.15291.pdf"><img style="border:none" src="/img/file-icon-text-12x16.gif" alt="Télécharger le document"/>PDF</a><br /><em>Publication</em> - <a href="/record/2876995/files/Publication.pdf"><img style="border:none" src="/img/file-icon-text-12x16.gif" alt="Télécharger le document"/>PDF</a><br /></div> </div> <div id="detailedrecordminipanelreview" style="width:30%;float:left;text-align:center"> </div> <div id="detailedrecordminipanelactions" style="width:36%;float:right;text-align:right;"> <ul class="detailedrecordactions"> <li><a href="/yourbaskets/add?ln=fr&recid=2876995">Ajouter au panier personnel</a></li> <li>Exporter vers <a style="text-decoration:underline;font-weight:normal" href="/record/2876995/export/hx?ln=fr">BibTeX</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2876995/export/hm?ln=fr">MARC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2876995/export/xm?ln=fr">MARCXML</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2876995/export/xd?ln=fr">DC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2876995/export/xe?ln=fr">EndNote</a>,  <a style="text-decoration:underline;font-weight:normal" href="/record/2876995/export/xn?ln=fr">NLM</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2876995/export/xw?ln=fr">RefWorks</a> </li> </ul> <div style='padding-left: 13px;'>  <div id="bookmark"></div> <div id="bookmark_sciencewise"></div> <style type="text/css"> #bookmark_sciencewise, #bookmark {float: left;} #bookmark_sciencewise li {padding: 2px; width: 25px;} #bookmark_sciencewise ul, #bookmark ul {list-style-image: none;} </style> <script type="text/javascript" src="/js/jquery.bookmark.min.js"></script> <style type="text/css">@import "/css/jquery.bookmark.css";</style> <script type="text/javascript">// <![CDATA[ $.bookmark.addSite('sciencewise', 'ScienceWise.info', 'https://cds.cern.ch/img/sciencewise.png', 'en', 'bookmark', 'http://sciencewise.info/bookmarks/2310.1529/add'); $('#bookmark_sciencewise').bookmark({sites: ['sciencewise']}); $('#bookmark').bookmark({ sites: ['facebook', 'twitter', 'linkedin', 'google_plusone'], icons: '/img/bookmarks.png', url: 'https://cds.cern.ch/record/2876995', addEmail: true, title: "Nuclear charge radius of $^{26m}$Al and its implication for V$_{ud}$ in the quark-mixing matrix", description: "Collinear laser spectroscopy was performed on the isomer of the aluminium isotope <math display=\"inline\"><mrow><mmultiscripts><mrow><mi>Al</mi></mrow><mprescripts/><none/><mrow><mn>26</mn><mi>m</mi></mrow></mmultiscripts></mrow></math>. The measured isotope shift to <math display=\"inline\"><mrow><mmultiscripts><mrow><mi>Al</mi></mrow><mprescripts/><none/><mrow><mn>27</mn></mrow></mmultiscripts></mrow></math> in the <math display=\"inline\"><mrow><mn>3</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup><mn>3</mn><mi>p</mi><mtext>\u2009</mtext><mmultiscripts><mrow><msubsup><mrow><mi>P</mi></mrow><mrow><mn>3</mn><mo>/</mo><mn>2</mn></mrow><mrow><mi>\u25cb</mi></mrow></msubsup></mrow><mprescripts/><none/><mrow><mn>2</mn></mrow></mmultiscripts><mo stretchy=\"false\">\u2192</mo><mn>3</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup><mn>4</mn><mi>s</mi><mtext>\u2009</mtext><mmultiscripts><mrow><msub><mrow><mi>S</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow><mprescripts/><none/><mrow><mn>2</mn></mrow></mmultiscripts></mrow></math> atomic transition enabled the first experimental determination of the nuclear charge radius of <math display=\"inline\"><mrow><mmultiscripts><mrow><mi>Al</mi></mrow><mprescripts/><none/><mrow><mn>26</mn><mi>m</mi></mrow></mmultiscripts></mrow></math>, resulting in <math display=\"inline\"><mrow><msub><mrow><mi>R</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>=</mo><mrow><mn>3.130</mn><mo stretchy=\"false\">(</mo><mn>15</mn><mo stretchy=\"false\">)</mo><mtext>\u2009</mtext><mtext>\u2009</mtext><mi>fm</mi></mrow></mrow></math>. This differs by 4.5 standard deviations from the extrapolated value used to calculate the isospin-symmetry breaking corrections in the superallowed <math display=\"inline\"><mi>\u03b2</mi></math> decay of <math display=\"inline\"><mrow><mmultiscripts><mrow><mi>Al</mi></mrow><mprescripts/><none/><mrow><mn>26</mn><mi>m</mi></mrow></mmultiscripts></mrow></math>. Its corrected <math display=\"inline\"><mi mathvariant=\"script\">F</mi><mi>t</mi></math> value, important for the estimation of <math display=\"inline\"><msub><mi>V</mi><mrow><mi>u</mi><mi>d</mi></mrow></msub></math> in the Cabibbo-Kobayashi-Maskawa matrix, is thus shifted by 1 standard deviation to 3071.4(1.0)\u00a0s." }); // ]]> </script>  </div> </div> <div style="clear:both;margin-bottom: 0;"></div> </div> <div class="bottom-left"></div><div class="bottom-right"></div> </div> </div></div> <footer id="footer" class="pagefooter clearfix">  <div class="pagefooterstripeleft"> CERN Document Server :: <a class="footer" href="https://cds.cern.ch/?ln=fr">Recherche</a> :: <a class="footer" href="https://cds.cern.ch/submit?ln=fr">Soumettre</a> :: <a class="footer" href="https://cds.cern.ch/youraccount/display?ln=fr">Personnaliser</a> :: <a class="footer" href="https://cds.cern.ch/help/?ln=fr">Aide</a> :: <a class="footer" href="https://cern.service-now.com/service-portal?id=privacy_policy&se=CDS-Service" target="_blank">Privacy Notice</a> :: <a class="footer" href="https://repository.cern/content-policy" target="_blank">Content Policy</a> :: <a class="footer" href="https://repository.cern/terms" target="_blank">Terms and Conditions</a> <br /> Powered by <a class="footer" href="http://invenio-software.org/">Invenio</a> <br /> Maintenu par <a class="footer" href="https://cern.service-now.com/service-portal?id=service_element&name=CDS-Service">CDS Service</a> - Need help? 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Nuclear charge radius of $^{26m}$Al and its implication for V$_{ud}$ in the quark-mixing matrix - CERN Document Server