First Measurement of the Quadrupole Moment of the 21+State in 110Sn

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Park, J, Lopez, RA, Cederkall, J, Fahlander, C, Golubev, P, Knyazev, A, Rickert, E, Iwanicki, J, Wrzosek-Lipska, K, Blazhev, A et al (show 28 more authors) , Reiter, P, Rosiak, D, Seidlitz, M, Warr, N ORCID: 0000-0001-7275-1063, Butler, PA ORCID: 0000-0001-6080-9205, Gaffney, LP ORCID: 0000-0002-2938-3696, Berry, T, Cox, DM, Pakarinen, J, Kroll, Th, Henrich, C, Schilling, M, Stahl, C, von Schmid, M, Rainovski, G, Berger, C, Berner, C, Gernhauser, R, Illana, A, De Witte, H, Gorska, M, Habermann, T, Saha, S, de Angelis, G, Borge, MJG, Tengblad, O, Otsuka, T and Tsunoda, Y (2025) First Measurement of the Quadrupole Moment of the 21+State in 110Sn PHYSICAL REVIEW LETTERS, 135 (22). 222502-. ISSN 0031-9007, 1079-7114

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Abstract

The Sn isotopic chain, exhibiting double shell closures at Sn100 and Sn132, is a key testing ground for theoretical models of the atomic nucleus. It was originally predicted that the transitional matrix elements between the first 2+ state and the 0+ ground state for the even-even isotopes in this chain should show a simple dependence on the neutron number. This prediction was, however, disproven experimentally in some of the first experiments with postaccelerated radioactive beams, a situation that has remained unresolved ever since. Subsequent theoretical work has suggested that the explanation can be found in proton excitations across the Z=50 shell gap, with an accompanying experimental signature that the first excited 2+ state in Sn110 should have a distinct oblate shape. In this Letter, we present the first measurements of the spectroscopic quadrupole moment of the 21+ state, B(E2;41+→21+) and B(E2;42+→21+) values for Sn110, as well as the B(E2;21+→01+) value with significantly improved precision compared to previous results. From the same experiment, half-lives of the 21+ and 41+ states were measured using the Doppler shift attenuation method. Our combined result, Q(21+)=20(8)efm2 for Sn110, is the largest positive value known among the Sn isotopes, indicating an oblate shape of the state by more than 2σ. Comparison of the E2 transition strengths and quadrupole moments with recent shell model calculations are presented.

Item Type:	Article
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 09:13
Last Modified:	16 Jun 2026 20:21
DOI:	10.1103/7ysn-8y1w
Open Access URL:	https://journals.aps.org/prl/abstract/10.1103/7ysn...
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3196417
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