학술논문
Low spin spectroscopy of neutron-rich 43,44,45Cl via {\beta} and (\beta}n decay
Document Type
Working Paper
Author
Tripathi, V.; Bhattacharya, S.; Rubino, E.; Benetti, C.; Perello, J. F.; Tabor, S. L.; Liddick, S. N.; Bender, P. C.; Carpenter, M. P.; Carroll, J. J.; Chester, A.; Chiara, C. J.; Childers, K.; Clark, B. R.; Crider, B. P.; Harke, J. T.; Jain, R.; Longfellow, B.; Luitel, S.; Mogannam, M.; Ogunbeku, T. H.; Richard, A. L.; Saha, S.; Shimizu, N.; Shehu, O. A.; Utsuno, Y.; Unz, R.; Xiao, Y.; Yoshida, S.; Zhu, Yiyi
Source
Subject
Language
Abstract
{\beta} decay of neutron-rich isotopes 43,45 S,studied at the National Superconducting Cyclotron Laboratory is reported here. {\beta} delayed {\gamma} transitions were detected by an array of 16 clover detectors surrounding the Beta Counting Station which consists of a 40x40 Double Sided Silicon Strip Detector followed by a Single Sided Silicon Strip Detector. {\beta} decay half-lives have been extracted for 43,45 S by correlating implants and decays in the pixelated implant detector with further coincidence with {\gamma} transitions in the daughter nucleus. The level structure of 43,45 Cl is expanded by the addition of 20 new {\gamma} transitions in 43Cl and 8 in 45 Cl with the observation of core excited negative-parity states for the first time. For 45 S decay, a large fraction of the {\beta} decay strength goes to delayed neutron emission populating states in 44 Cl which are also presented. Comparison of experimental observations is made to detailed shell-model calculations using the SDPFSDG-MU interaction to highlight the role of the diminished N = 28 neutron shell gap and the near degeneracy of the proton s 1/2 and d 3/2 orbitals on the structure of the neutron-rich Cl isotopes. The current work also provides further support to a ground state spin-parity assignment of 3/2 + in 45 Cl.