Negative-parity intruder states of the neutron-rich N = 20 , Z = 14-16 isotones: a 1ℏ shell model description

M. Bouhelal; F. Haas; E. Caurier; F. Nowacki; A. Bouldjedri

doi:10.1140/epja/i2009-10782-9

EPJ

Negative-parity intruder states of the neutron-rich N = 20 , Z = 14-16 isotones: a 1ℏ

shell model description

M. Bouhelal¹^,2^*, F. Haas¹, E. Caurier¹, F. Nowacki¹ and A. Bouldjedri²

¹ IPHC, CNRS/IN2P3, Université de Strasbourg, F-67037, Strasbourg, Cedex2, France
² Département de Physique, Faculté des Sciences, Université de Batna, Batna, Algérie

Received: 22 December 2008
Revised: 4 March 2009
Accepted: 19 March 2009
Published online: 30 April 2009

Abstract

In order to get a consistent shell model description of the negative-parity states throughout the sd shell a new interaction (PSDPFB) has been developed. It was derived in the full p -sd -pf model space and is built on existing interactions for the major shells with adjustments of the cross-shell monopoles. The calculated energy spectra for these 1ℏ

intruder states are compared to experiment for the N = 20 neutron-rich isotones ³⁴Si , ³⁵P and ³⁶S . A systematics for the multiplet configuration