Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 6: Nuclear Structure and Dynamics I

HK 6.3: Talk

Monday, March 16, 2009, 15:00–15:15, H-ZO 40

Shell model description of negative parity intruder states in sd nuclei — •Mouna Bouhelal^1,2, Florent Haas¹, Etienne Caurier¹, and Frédéric Nowacki¹ — ¹IPHC, CNRS/IN2P3, Université de Strasbourg, F-67037 Strasbourg Cedex 2, France — ²Département des Sciences de la Matière, Université de Tébessa, Tébessa 12002, Algérie

To describe in a consistent way the negative parity intruder states throughout the sd shell, a new interaction has been developed in the psdpf model space with a ⁴He core. These 1 ℏω states result from the promotion of one nucleon from p to sd shell for nuclei close to ¹⁶O or from sd to pf for nuclei close to ⁴⁰Ca. Our interaction is based on existing interactions for the major shells; however, to describe the 1 ℏω states the cross shell parts are essential. They have been adjusted through a fitting procedure involving the well known negative parity states of sd nuclei close to the stability line.

The obtained PSDPF interaction has then be used to calculate energy spectra and electromagnetic properties of nuclei throughout sd. As an example, we will present our results for isotopic chains of P and S isotopes with N ∼ Z−2 to N=20 and compare them with experimental spectroscopic data