Eda Sahin, LNL Legnaro
Mercredi 15 Juillet 2009 à 10h30 - Salle des Séminaires
The level structures of the N=50 83As, 82Ge and 81Ga isotones have been investigated by means of the multi-nucleon transfer and deep inelastic reaction 82Se on 238U at 515 MeV. Gamma-rays deexciting states of the nuclei of interest have been identified using the CLARA-PRISMA array. g -ray coincidence information has been obtained by means of a complementary experiment performed at the GASP array. The collected information on the high spin states of such nuclei is used to test the stability of the N=50 shell closure in the region of 78Ni. Through the comparison of the experimentally determined level energies with the results of detailed shell-model calculations, an energy gap value of 4.7(2) MeV is extracted for Z=28. This result, in good agreement with the prediction of the finite-range liquid-drop model, excludes a weakening of the N=50 shell gap down to Z=28.
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