Collectivity in S41

Open Access

Abstract

Yrast states in the neutron-rich S41 nucleus have been studied using binary grazing reactions produced by the interaction of a 215-MeV beam of S36 ions with a thin Pb208 target. The magnetic spectrometer, PRISMA, and the γ-ray array, CLARA, were used in the measurements. γ-ray transitions of energy 449 and 638 keV were observed. Results from published intermediate-energy Coulomb excitation measurements in combination with those from the present work have led to the construction of a new S41 level scheme. Proposed Jπ values are based on experimental observation and on model-dependent arguments. The level scheme and published electromagnetic transition probabilities are discussed within the context of state-of-art shell-model calculations using the SDPF-U effective interaction. In contrast with the excellent agreement observed in earlier published work, here there are significant discrepancies between experiment and the results of shell-model calculations. © 2011 American Physical Society. ; Supported in part by the EPSRC (UK) and by the European Union under Contract No. RII3-CT- 2004-506065. A.J. acknowledges financial support from the m Spanish Ministerio de Ciencia e Innovacion under Contracts No. FPA2007-66069 and No. FPA2009-13377-C02-02. Zs.D. acknowledges the financial support from OTKA Project No. K68801. ; Peer Reviewed