Enhanced Quadrupole and Octupole Strength in Doubly Magic Sn 132

Research output: Contribution to journalArticle

Abstract

The first 2+ and 3- states of the doubly magic nucleus Sn132 are populated via safe Coulomb excitation employing the recently commissioned HIE-ISOLDE accelerator at CERN in conjunction with the highly efficient MINIBALL array. The Sn132 ions are accelerated to an energy of 5.49 MeV/nucleon and impinged on a Pb206 target. Deexciting γ 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 0g.s.+→21+, 0g.s.+→31-, and 21+→31- in Sn132. 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;0g.s.+→21+) 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 Sn132.

Details

Authors
  • MINIBALL
  • HIE-ISOLDE
  • D. Rosiak
  • M. Seidlitz
  • P. Reiter
  • H. Naïdja
  • Y. Tsunoda
  • T. Togashi
  • F. Nowacki
  • T. 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. Huyse
  • A. Illana
  • K. Johnston
  • L. Kaya
  • Th Kröll
  • M. L.Lozano Benito
  • J. Ojala
  • J. Pakarinen
  • M. Queiser
  • G. Rainovski
  • J. A. Rodriguez
  • B. Siebeck
  • E. Siesling
  • J. Snäll
  • P. Van Duppen
  • A. Vogt
  • M. Von Schmid
  • N. Warr
  • F. Wenander
  • K. O. Zell
Organisations
External organisations
  • University of Cologne
  • University of Strasbourg
  • University of Tokyo
  • RIKEN Nishina Center for Accelerator-Based Science
  • Catholic University of Leuven
  • Michigan State University
  • University of Milan
  • University of Surrey
  • CERN
  • University of Jyväskylä
  • Helsinki Institute of Physics
  • Technical University of Darmstadt
  • University of Sofia
  • Hubert Curien Multi-disciplinary Institute
  • University Of Constantine 1
  • INFN Section of Milano
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number252501
JournalPhysical Review Letters
Volume121
Issue number25
Publication statusPublished - 2018 Dec 18
Publication categoryResearch
Peer-reviewedYes