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Dresden 2000 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 10: Kernphysik / Spektroskopie II

HK 10.8: Talk

Monday, March 20, 2000, 18:45–19:00, B 68

Fission Barrier and High Angular Momentum States of Z=102 Nobelium Isotopes — •Peter Reiter1,2, T.L. Khoo2, T. Lauritsen2, C.J. Lister2, D. Seweryniak2, I. Ahmad2, N. Amzal3, P. Bhattacharyya2, P.A. Butler3, M.P. Carpenter2, A.J. Chewter3, J.A. Cizewski2,4, C.N. Davids2, J.P. Greene2, P.T. Greenlees3, A. Heinz2, W.F. Henning2, R.-D. Herzberg3, R.V.F. Janssens2, G.D. Jones3, F.G.. Kondev2, M. Leino5, S. Siem2,6, A.A. Sonzogni2, J. Uusitalo2,5, K. Vetter7, and I. Wiedenhöver21Sektion Physik, LMU München — 2Argonne National Laboratory — 3University of Liverpool — 4Rutgers University — 5University of Jyvaskyla — 6University of Oslo — 7Berkeley National Laboratory

Excited states in 253,254No were produced via 48Ca induced reactions on 207,208Pb targets. Gammasphere was used to measure not only the discrete γ rays, but also the γ-ray multiplicity and sum energy. The γ rays from nobelium nuclei were identified from a high fission background by requiring coincidences with evaporation residues. The latter were identified with the Argonne fragment mass analyzer. The ground-state band of 254No has been identified up to spin 20. The entry distribution in angular momentum and excitation energy for formation of 254No has been measured for two excitation energies. This nucleus survives up to spin 22 ℏ and excitation energy >6 MeV above the yrast line, implying that the shell-correction energy persists to high spin. Experimental values for the shell correction are provided. Comparable results are obtained for the odd neighbour isotope 253No.

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