Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 17: Nuclear Physics / Spectroscopy II

HK 17.3: Vortrag

Dienstag, 12. März 2002, 17:45–18:00, B

Study of the oblate deformed g_9/2 band in the N=Z+1 nucleus ⁶⁹Se — •I. Stefanescu¹, J. Eberth¹, G. Gersch¹, T. Steinhardt¹, O. Thelen¹, N. Warr¹, D. Weisshaar¹, G. de Angelis², T. Martinez², D. Curien³, K.P. Lieb⁴, A. Jungclaus⁴, R. Schwengner⁵, and E. Stefanova⁵ — ¹Institut für Kernphysik, Zülpicherstr. 77, D-50937 Köln, Germany — ²Laboratori Nazionali INFN, I-35020 Legnaro, Italy — ³CRN Strasbourg, F-67037 Strasbourg, France — ⁴II. Phys. Institut, Universität Göttingen, D-37073 Göttingen, Germany — ⁵Inst. für Kern- und Hadronenphysik , Forschungszentrum Rossendorf, Germany

The γ-ray transitions in the ⁶⁹Se nucleus have been investigated in the ⁴⁰Ca(³²S,2pn)⁶⁹Se reaction at 105 MeV using the Euroball array coupled with ancillary detectors. The target consisted of a 800 µ g/cm² 99.965 % enriched self-suporting ⁴⁰Ca foil.

The level scheme of ⁶⁹Se has been established by means of particle-gated γ-γ and γ-γ-γ coincidences up to 13.7 MeV and J^π=53/2⁺ for the prolate-deformed band which crosses the oblate band built on the g_9/2 orbital. Some new lines have also been added to the structure resulting from the coupling of one octupole phonon to the 9/2⁺ state in the prolate band.

The spins of the levels were deduced, whenever possible, from the analysis of the directional correlation ratios from oriented states (DCO) using the γ-γ and the neutron-γ-γ events.

Funded by German BMBF under Contract No. 06OK958.