Structure of neutron-rich nuclei around 132Sn

Abstract

Recent studies have provided new experimental information on neutron-rich nuclei around doubly magic 132Sn. We have performed shell-model calculations for the two- and three-proton N=82 isotones 134Te and 135I using a realistic effective interaction derived from the Bonn A nucleon-nucleon potential. The results are in remarkably good agreement with the experimental data evidencing the reliability of our realistic effective interaction

Evolution of single-particle states beyond132Sn

“…For protons, the first four are taken to be the experimental energies of the levels with corresponding spin and parity in 133 Sb [15]. The energy of the s 1/2 orbit, which is still missing, is taken from [16], where it was determined by reproducing the experimental energy of the 1/2 + state at 2.150 MeV in 137 Cs. This is, in fact, populated with significant strength in the 136 Xe( 3 He, d) 137 Cs transfer reaction [3], while no 1/2 + state has been yet identified in the lighter N = 82 isotone, 135 I.…”

One-phonon isovector21,MS+state in the neutron-rich nucleus132Te

“…The only exception is the proton ǫ s 1/2 which has been taken from Ref. [32], since the corresponding single-particle level is still missing in the spectrum of 133 Sb. Our adopted values for the proton single-particle energies are (in MeV): ǫ g 7/2 = 0.0, ǫ d 5/2 = 0.962, ǫ d 3/2 = 2.439, ǫ h 11/2 = 2.793, and ǫ s 1/2 = 2.800, and for the neutron single-hole energies: ǫ = 2.434.…”

Realistic Shell-Model Calculations for Exotic Nuclei Around Closed Shells

“…The values of ε s 1/2 and ε i 13/2 have been taken from Refs. [17] and [18], respectively, where it is discussed how they are determined. In the same way, for Bi isotopes, we have made use of the experimental spectra of 209 Bi and 209 Pb.…”