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Freiburg 1999 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 10: Kernphysik II / Spektroskopie I

HK 10.6: Vortrag

Montag, 22. März 1999, 18:00–18:15, B

Dipole Excitations of (21+31) Particle States in 117,119Sn — •J. Bryssinck1, L. Govor2, V.Yu. Ponomarev3, F. Bauwens1, O. Beck4, D. Belic4, P. von Brentano5, D. De Frenne1, C. Fransen5, R.-D. Herzberg6, E. Jacobs1, U. Kneissl4, H. Maser4, A. Nord4, N. Pietralla5, H.H. Pitz4, and V. Werner51Vakgroep Subatomaire en Stralingsfysica Gent — 2Kurchatov Institute Moscow — 3JINR Dubna — 4Institut fuer Strahlenphysik, Universitaet Stuttgart — 5Institut fuer Kernphysik, Universitaet zu Koeln — 6Oliver Lodge Laboratory, University of Liverpool

Following our systematic investigations of two-phonon (21+ ⊗ 31)1 states in the even semi-magic 116,118,120,122,124Sn nuclei (Z = 50), the coupling of an odd midshell neutron to the (21+ ⊗ 31) quintuplet was studied in the neighbouring odd-mass nuclei 117,119Sn. Photon scattering experiments performed at the Stuttgart facility suggest that for the odd neutron in 117Sn at least the 3s1/2 and the low-lying 2d3/2 (159 keV) orbitals play an important role. The observed summed reduced excitation probability in the energy region between 2.8 MeV and 3.5 MeV amounts to (72 ± 13)% of the B(E1)↑ strength of the (21+ ⊗ 31)1 levels in the neighbouring 116Sn and 118Sn nuclei. This indicates that the midshell neutron couples weakly to the quadrupole-octupole quintuplet. Similar experiments were performed recently on 119Sn. The results are discussed within the Quasi-particle Phonon Model.
Supported by DFG and the Fund for Scientific Research-Flanders

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