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HK: Physik der Hadronen und Kerne
HK 30: Nuclear Physics / Spectroscopy IV
HK 30.2: Vortrag
Mittwoch, 13. März 2002, 14:30–14:45, B
Isomer spectroscopy and large scale shell model calculations at the borderline to fission — •H. Grawe1, K. Hauschild2, M. Rejmund2, E. Caurier3, F. Nowacki3, J. Döring1, M. Górska1, K. Helariutta4, P. Jones4, R. Julin4, W. Korten2, M. Leino4, K. Schmidt1, and J. Uusitalo4 — 1GSI, Darmstadt, Germany — 2DAPNIA/SPhN CEA, Saclay, France — 3IReS,Strasbourg, France — 4JYFL, Jyväskylä,Finland
Nuclear structure calculations in the complementary mean field and shell model approaches are limited in their predictive power due to the neglect of correlations and the model space truncation, respectively. The availability of large-scale shell model codes enables separation of truncation effects from deficiencies in the realistic interactions employed. Progress in detection techniques, such as recoil decay tagging, allows for γ-ray spectroscopy at the borderline to fission down to cross sections of <1 µ b [1,2]. The N=126 isotones up to 217Pa were studied and compared to shell model predictions in the full 82≤ Z ≤126 proton model space using the Kuo-Herling realistic interaction. Excellent agreement is found for masses, excitation energies and E2 properties, while E3 correlations due to the neglect of neutron degrees of freedom and 208Pb core excitations cannot be described. Enhanced pair scattering, besides the expected L=3 correlations, are found to be responsible for the non-existence of the Z=92 subshell [1] predicted in early mean field calculations [3].
[1] K. Hauschild et al., Phys. Rev. Lett. 87, 072501 (2001)
[2] R. Herzberg et al., Phys. Rev. C 65, 014303 (2002)
[3] K. Rutz et al., Nucl. Phys. A 634, 67 (1998)