Copertina

Multiple shape coexistence near Sn118: First 03+ lifetime measurement

Fuente: arXiv

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Dettagli Bibliografici
Autori principali:	Wu, F., Ding, C. R., Andreoiu, C., Karayonchev, V., Li, Y., Michelagnoli, C., Petrache, C. M., Régis, J. -M., Yao, J. M., Beuschlein, M., Colombi, G., Daugas, J. M., Domenichetti, L., Esmaylzadeh, A., Garrett, P. E., Jolie, J., Ley, M., Pannu, S., Spagnoletti, P., Taddei, E.
Natura:	Preprint
Pubblicazione:	2026
Soggetti:	Nuclear Experiment Nuclear Theory
Accesso online:	Acceder al recurso
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_version_	1866911672870895616
author	Wu, F. Ding, C. R. Andreoiu, C. Karayonchev, V. Li, Y. Michelagnoli, C. Petrache, C. M. Régis, J. -M. Yao, J. M. Beuschlein, M. Colombi, G. Daugas, J. M. Domenichetti, L. Esmaylzadeh, A. Garrett, P. E. Jolie, J. Ley, M. Pannu, S. Spagnoletti, P. Taddei, E.
author_facet	Wu, F. Ding, C. R. Andreoiu, C. Karayonchev, V. Li, Y. Michelagnoli, C. Petrache, C. M. Régis, J. -M. Yao, J. M. Beuschlein, M. Colombi, G. Daugas, J. M. Domenichetti, L. Esmaylzadeh, A. Garrett, P. E. Jolie, J. Ley, M. Pannu, S. Spagnoletti, P. Taddei, E.
contents	The intruder bands in Sn isotopes, built on the 2p-2h excitation across the $Z = 50$ proton shell gap, are well-known examples of shape coexistence near the neutron mid-shell region. Spectroscopic signatures for shape coexistence include enhanced $E0$ transitions between the $0^+$ band heads. However, the underlying shape coexistence and mixing has been unclear because lifetime information for the excited $0^+$ states was incomplete in $^{118}$Sn. We thus present here the first measurement of the $0^+_3$ lifetime in $^{118}$Sn using the fast-timing technique following thermal-neutron capture. The observed enhancement in $ρ^2(E0; 0^+_3 \rightarrow 0^+_2)$ of 150(30) milliunits provides compelling indications for multiple shape coexistence in $^{118}$Sn. Additionally, three distinct shapes in $^{116,118,120}$Sn naturally emerged in theoretical calculations based on the quantum-number-projected generator coordinate method employing a relativistic energy density functional.
format	Preprint
id	arxiv_https___arxiv_org_abs_2605_11412
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Multiple shape coexistence near Sn118: First 03+ lifetime measurement Wu, F. Ding, C. R. Andreoiu, C. Karayonchev, V. Li, Y. Michelagnoli, C. Petrache, C. M. Régis, J. -M. Yao, J. M. Beuschlein, M. Colombi, G. Daugas, J. M. Domenichetti, L. Esmaylzadeh, A. Garrett, P. E. Jolie, J. Ley, M. Pannu, S. Spagnoletti, P. Taddei, E. Nuclear Experiment Nuclear Theory The intruder bands in Sn isotopes, built on the 2p-2h excitation across the $Z = 50$ proton shell gap, are well-known examples of shape coexistence near the neutron mid-shell region. Spectroscopic signatures for shape coexistence include enhanced $E0$ transitions between the $0^+$ band heads. However, the underlying shape coexistence and mixing has been unclear because lifetime information for the excited $0^+$ states was incomplete in $^{118}$Sn. We thus present here the first measurement of the $0^+_3$ lifetime in $^{118}$Sn using the fast-timing technique following thermal-neutron capture. The observed enhancement in $ρ^2(E0; 0^+_3 \rightarrow 0^+_2)$ of 150(30) milliunits provides compelling indications for multiple shape coexistence in $^{118}$Sn. Additionally, three distinct shapes in $^{116,118,120}$Sn naturally emerged in theoretical calculations based on the quantum-number-projected generator coordinate method employing a relativistic energy density functional.
title	Multiple shape coexistence near Sn118: First 03+ lifetime measurement
topic	Nuclear Experiment Nuclear Theory
url	https://arxiv.org/abs/2605.11412