Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 10: Poster Session: Nuclear Structure/Spectroscopy
HK 10.1: Poster
Dienstag, 9. März 2004, 13:30–15:30, Foyer
High spin states in the nuclei 74Kr, 75Kr and 76Kr — •T. Steinhardt1, J. Eberth1, S. Skoda1, O. Thelen1, C. Plettner2, H. Schnare2, R. Schwengner2, F. Dönau2, G. de Angelis3, E. Farnea4, A. Gadea4, A. Jungclaus5, K.P. Lieb5, D. R. Napoli3, and R. Wadsworth6 — 1Inst. für Kernphysik, Universität Köln, Köln — 2Inst. für Kern- und Hadronenphysik, FZ Rossendorf, Dresden, Germany — 3INFN, Laboratori Nazionali di Legnaro, Legnaro, Italy — 4Instituto de Fisica Corpuscular, Valencia, Spain — 5II. Phys. Inst., Universität Göttingen, Göttingen, Germany — 6University of York, Physics Department, Heslington, York, UK
At low spin, the deformation of nuclei in the A ≈ 80 mass region is
strongly changing for neighboring nuclei as consequence of the low Nilsson
level density. Due to the proximity of N=Z, p-n pairing may also
play an important role.
The motivation for the analysis of the nuclei 73Kr, 74Kr,
75Kr
and 76Kr was to study the influences of the Nilsson structure and the
p-n pairing on high spin states.
To investigate the nuclei, the data of an experiment applying the EUROBALL
spectrometer, including the silicon detector array ISIS for charged
particle
identification and the BC501A
scintillator array NWALL for neutron detection, have been analyzed. The
reaction was 40Ca + 40Ca at 185MeV beam energy.
From the analysis of multi-dimensional Eγ histograms,
levels up to an excitation energy of ≈ 30MeV
and estimated spins of 35ℏ could be established. The results are
discussed with respect to the systematics of this mass region and compared
to
calculations in the cranked shell model.
This work is supported by the BMBF under contract no. 06 OK 958.