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HK: Hadronen und Kerne

HK 28: Spectroscopy: 70 ≤ A < 110

HK 28.6: Talk

Tuesday, March 17, 1998, 15:30–15:45, D

Proton decay of high-lying single-particle states in ⁹¹Nb — •H.K.T. van der Molen¹, H. Akimune², A.M. van den Berg¹, I. Daito², H. Fujimura², M. Fujiwara², Y. Fujita³, M.N. Harakeh¹, F. Ihahra², T. Inomata², K. Ishibashi², J. Jänecke⁴, N. Kalantar¹, H. Laurent⁵, I. Lhenry⁵, T. O’Donell⁴, A. Tamii⁶, H. Toyokawa⁷, H. Yoshida², and M. Yosoi⁶ — ¹Kernfysisch Versneller Instituut, the Netherlands — ²Research Center for Nuclear Physics, Osaka University, Japan — ³Dept. of Physics, Osaka University, Japan — ⁴Dept. of Physics, University of Michigan, USA — ⁵Institut de Physique Nucléaire, France — ⁶Dept. of Physics, Kyoto University, Japan — ⁷Spring8, Japan

In previous studies of transfer reactions on medium-weight and heavy nuclei, broad structures were observed at high excitation energies. These structures were identified as high-lying single-particle states. The study of the decay of these states by particle emission can give us information on the microscopic structure of these states and on their spreading mechanism. In an experiment at RCNP in Osaka, Japan we have studied the proton decay from ⁹¹Nb following the ⁹⁰Zr(α,t)⁹¹Nb reaction at a bombarding energy of 180 MeV. The tritons were analyzed in the spectrometer Grand Raiden and a setup of 40 silicon detectors was used for the detection of the protons, allowing us to study the angular correlation between the emitted proton and the triton. In this talk, results of the experiment and comparison with theoretical predictions will be presented.