Nuclear Structure of Tellurium 133 Via beta Decay and Shell Model Calculations in the Doubly Magic Tin 132 Region

摘要

An experimental investigation of the level structure of exp 133 Te was performed by spectroscopy of gamma-rays following the beta-decay of 2.7 min exp 133 Sb. Multiscaled gamma-ray singles spectra and 2.5 x 10 exp 7 gamma-gamma coincidence events were used in the assignment of 105 of the approximately 400 observed gamma-rays to exp 133 Sb decay and in the construction of the exp 133 Te level scheme with 29 excited levels. One hundred twenty-two gamma-rays were identified as originating in the decay of other isotopes of Sb or their daughter products. The remaining gamma-rays were associated with the decay of impurity atoms or have as yet not been identified. A new computer program based on the Lanczos tridiagonalization algorithm using an uncoupled m-scheme basis and vector manipulations was written. It was used to calculate energy levels, parities, spins, model wavefunctions, neutron and proton separation energies, and some electromagnetic transition probabilities for the following nuclei in the exp 132 Sn region: exp 128 Sn, exp 129 Sn, exp 130 Sn, exp 131 Sn, exp 130 Sb, exp 131 Sb, exp 132 Sb, exp 133 Sb, exp 132 Te, exp 133 Te, exp 134 Te, exp 134 I, exp 135 I, exp 135 Xe, and exp 136 Xe. The results are compared with experiment and the agreement is generally good. For non-magic nuclei: the lg/sub 7/2/, 2d/sub 5/2/, 2d/sub 3/2/, 1h/sub 11/2/, and 3s/sub 1/2/ orbitals are available to valence protons and the 2d/sub 5/2/, 2d/sub 3/2/, 1h/sub 11/2/, and 3s/sub 1/2/ orbitals are available to valence neutron holes. The present CDC7600 computer code can accommodate 59 single particle states and vectors comprised of 30,000 Slater determinants. The effective interaction used was that of Petrovich, McManus, and Madsen, a modification of the Kallio-Kolltveit realistic force. Single particle energies, effective charges and effective g-factors were determined from experimental data for nuclei in the exp 132 Sn region. 116 references. (ERA citation 04:055727)