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Enhanced Quadrupole and Octupole Strength in Doubly Magic Sn 132

2018; American Physical Society; Volume: 121; Issue: 25 Linguagem: Inglês

10.1103/physrevlett.121.252501

1092-0145

D. Rosiak, M. Seidlitz, P. Reiter, H. Naïdja, Y. Tsunoda, Tomoaki Togashi, F. Nowacki, Takaharu Otsuka, G. Colò, K. Arnswald, T. Berry, A. Blazhev, M. J. G. Borge, J. Cederkäll, D. M. Cox, H. De Witte, L. P. Gaffney, C. Henrich, R. Hirsch, M. Huýse, A. Illana, K. Johnston, L. Kaya, Th. Kröll, Miguel Lozano Benito, J. Ojala, J. Pakarinen, M. Queiser, G. Rainovski, José A. Rodríguez, B. Siebeck, E. Siesling, J. Snäll, P. Van Duppen, A. Vogt, M. von Schmid, N. Warr, F. Wenander, K. O. Zell,

Boron and Carbon Nanomaterials Research

The first ${2}^{+}$ and ${3}^{\ensuremath{-}}$ states of the doubly magic nucleus $^{132}\mathrm{Sn}$ are populated via safe Coulomb excitation employing the recently commissioned HIE-ISOLDE accelerator at CERN in conjunction with the highly efficient MINIBALL array. The $^{132}\mathrm{Sn}$ ions are accelerated to an energy of $5.49\text{ }\text{ }\mathrm{MeV}/\mathrm{nucleon}$ and impinged on a $^{206}\mathrm{Pb}$ target. Deexciting $\ensuremath{\gamma}$ rays from the low-lying excited states of the target and the projectile are recorded in coincidence with scattered particles. The reduced transition strengths are determined for the transitions ${0}_{\mathrm{g}.\mathrm{s}.}^{+}\ensuremath{\rightarrow}{2}_{1}^{+}$, ${0}_{\mathrm{g}.\mathrm{s}.}^{+}\ensuremath{\rightarrow}{3}_{1}^{\ensuremath{-}}$, and ${2}_{1}^{+}\ensuremath{\rightarrow}{3}_{1}^{\ensuremath{-}}$ in $^{132}\mathrm{Sn}$. The results on these states provide crucial information on cross-shell configurations which are determined within large-scale shell-model and Monte Carlo shell-model calculations as well as from random-phase approximation and relativistic random-phase approximation. The locally enhanced $B(E2;{0}_{\mathrm{g}.\mathrm{s}.}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})$ strength is consistent with the microscopic description of the structure of the respective states within all theoretical approaches. The presented results of experiment and theory can be considered to be the first direct verification of the sphericity and double magicity of $^{132}\mathrm{Sn}$.