The structure of 113Sn from proton and alpha- particle induced reactions.

Autor: Käubler, L., Lobach, Yu. N., Trishin, V. V., Pasternak, A. A., Kudojarov, M. F., Prade, H., Reif, J., Schwengner, R., Winter, G., Blomqvist, J., Döring, J.
Zdroj: Zeitschrift für Physik A Hadrons & Nuclei; Sep1997, Vol. 358 Issue 3, p303-315, 13p
Abstrakt: The results of in-beam investigations of 113 Sn using the (p,n), (p,3n), (α,n) and (α,2n) reactions are summarized. Excited states have been identified until Ex = 4715 MeV and Jπ = (27/2t -). For a large number of levels mean lifetimes τ have been determined with the DSA method. For the Jk = 25/2+ state at Ex = 4059 MeV, τ = 1.0(4) ns has been measured with the γ-RF method. The experimental results are compared with the predictions of shell-model calculations. Most of the positive-parity states may be considered as one-or three-quasiparticle neutron excitations of the 2d5/2, 1g7/2, 3s1/2 and 2d3/2 shells, the negative-parity states as the coupling of one 1h11/2 neutron to the two- or four-quasiparticle neutron excitations in the even-mass 112Sn core. For the 25/2+ isomer the three-quasiparticle neutron configuration ν(h112/2 g72/−1) has been proposed on the basis of a shell-model analysis using the mass-formula formalism. The experimentally observed yrast states in 50113Sn63 are compared with the corresponding states in the valence mirror nucleus 63145Eu82 giving remarkable similarities although the parameters for the shell-model calculations differ considerably. The analysis of nearest-neighbour spacing distributions of experimentally obtained 5/2+ states in 113Sn does not allow definite conclusions about regularity or chaos. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
Externí odkaz: