Nuclear structure of 131Te studied with (n,γ) and ((d)over-right-arrow,p) reactions

The structure of Te-131 has been investigated with the Te-130(n, gammagamma)Te-131 reaction using thermal neutrons and with the Te-130(d,p)Te-131 reaction using polarized deuterons with energy E-d = 18 MeV About 290 levels were identified in most cases including spin, parity and gamma-decay. The gamma-decay scheme after neutron capture is essentially complete containing about 100% of the decay of the capture state and about 100% of the population of the 11/2(-) isomer and of the ground state. The scheme includes 42 primary transitions with energies between 750 keV and 2500 keV The experimental level scheme is compared with predictions of the Interacting Boson-Fermion model (IBFM) and of the Quasiparticle Phonon Model (QPM). The isomeric ratio of the 11/2(-) isomer at 182.31(5) keV was determined to be 0.054(2). The neutron binding energy is 5929.38(6) keV The total thermal neutron capture cross section was found to be 186(13) mbarn. (C) 2002 Elsevier Science B.V. All rights reserved.