München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 4: Kernphysik/Spektroskopie
HK 4.7: Gruppenbericht
Montag, 20. März 2006, 15:30–16:00, C
Mirror symmetry of new subshell closures: 36Ca vs 36S — •Pieter Doornenbal1,2 and Peter Reiter2 — 1GSI Darmstadt, Germany — 2Univ. Köln, Germany
The new N,Z=14(16) shell stabilisation and the N=20 shell quenching in 32Mg are supposed to be caused by the monopole part of the nucleon-nucleon residual interaction. Disregarding the different neutron binding energy an isospin symmetric scenario is expected for the N=16-20 mirror region and can be verified by experiments along the light Ca (Z=20) isotopes. The 36Ca ions were produced by secondary fragmentation reactions of a secondary 37Ca beam of 200 AMeV impinging on a 0.7 g/cm2 9Be target at the FRS focal plane. Gamma-rays were observed by the Ge Cluster detectors, the MINIBALL spectrometer, the HECTOR array of the RISING setup and recorded together with particle and position information. The 2+ excitation energy in 36Ca of 3017(24) keV is 270 keV lower than its T=2 mirror 36S. Shell model calculations were performed using a 16O core, the sd shell isospin symmetric interaction USD and experimental single particle energies (SPE) from 17O and 17O. Preliminary results reproduce the energy shift qualitatively indicating that a major part of it is due to the Thomas-Ehrmann shift of A=17 SPE.