Coulomb excitation of pear-shaped nuclei

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Butler, Peter ORCID: 0000-0001-6080-9205, Gaffney, Liam ORCID: 0000-0002-2938-3696, Spagnoletti, Pietro, Konki, Joonas, Scheck, Marcus, Smith, John, Abrahams, Kenzo, Bowly, Michael, Cederkall, Joakim, Chupp, Timothy et al (show 34 more authors) , de Angelis, Giacomo, De Witte, Hilde, Garrett, Paul, Goldkuhle, Alina, Henrich', Corinna, Illana, Andres, Johnston, Karl, Joss, David ORCID: 0000-0001-5763-8767, Keatings, James, Kelly, Nicola, Komorowska, Michalina, Kroell, Thorsten, Lozano, Miguel, Singh, Bondili Nara, O'Donnell, David, Ojala, Joonas, Page, Robert ORCID: 0009-0009-7062-711X, Pedersen, Line, Raison, Christopher, Reiter, Peter, Rodriguez, Jose Alberto, Rosiak, Dawid, Rothe, Sebastian, Shneidman, Timur, Siebeck, Burkhard, Seidlitz, Michael, Sinclair, Jacqueline, Stryjczyk, Marek, Van Duppen, Piet, Vinals, Silvia, Virtanen, Ville, Warr, Nigel ORCID: 0000-0001-7275-1063, Wrzosek-Lipska, Kasia and Zielinska, Magda (2019) Coulomb excitation of pear-shaped nuclei .

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Abstract

There is a large body of evidence that atomic nuclei can undergo octupole distortion and assume the shape of a pear. This phenomenon is important for measurements of electric-dipole moments of atoms, which would indicate CP violation and hence probe physics beyond the Standard Model of particle physics. Isotopes of both radon and radium have been identified as candidates for such measurements. Here, we have observed the low-lying quantum states in 224 Rn and 226 Rn by accelerating beams of these radioactive nuclei. We show that radon isotopes undergo octupole vibrations but do not possess static pear-shapes in their ground states. We conclude that radon atoms provide less favourable conditions for the enhancement of a measurable atomic electric-dipole moment.

Item Type:	Conference Item (Unspecified)
Uncontrolled Keywords:	5106 Nuclear and Plasma Physics, 5110 Synchrotrons and Accelerators, 51 Physical Sciences
Divisions:	Faculty of Science & Engineering Faculty of Science & Engineering > School of Physical Sciences Faculty of Science & Engineering > School of Physical Sciences > Physics
Depositing User:	Symplectic Admin
Date Deposited:	06 Jan 2026 09:08
Last Modified:	23 May 2026 03:28
DOI:	10.1051/epjconf/201922301007
Open Access URL:	https://doi.org/10.1051/epjconf/201922301007
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3196424
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