Four - quasiparticle alignments in 66 Ge

ar X iv : c on d - m at / 9 40 10 66 v 1 2 8 Ja n 19 94 Ground state energy and quasiparticle gaps

Neutrinoless ββ matrix element of 76 Ge from spectroscopic data

In this work we use the recently measured neutron pairing correlations in the 76 Ge and 76 Se nuclei as a guideline to adjust the single-particle energies in the 1p0f0g shell. The resulting BCS occupations reproduce the measured pairing data. The proton energies were inspected by using the odd-mass nuclei adjacent to 76 Ge and 76 Se as spectroscopic tools. The nuclear matrix element of the neut...

Multi - quasiparticle states in 184 W via multi - nucleon transfer

A multi-nucleon transfer reaction using an 850 MeV Xe beam incident on a Pt target was used to populate high-spin states in W, 14 nucleons from the target. A 4-quasiparticle isomer with t1/2 = 188±38 ns has been observed for the first time and its de-excitation through collective and intrinsic structures studied. The results are compared with predictions of blocked BCS Nilsson calculations. Obs...

Charged Majoron Emission in Neutrinoless Double Beta Decay *

We examine in detail the predictions of the charged majoron model, introduced recently by Burgess and Cline, for 0 + → 0 + ββ transitions. The relevant nuclear matrix elements are evaluated, within the quasiparticle random phase approximation, for 76 Ge, 128 Te and 150 Nd nuclei. The calculated transition rates turn out to be much smaller than the experimental upper limits on possible majoron e...

Three-Quasiparticle Intruder State in Te125 and the Magnetic Moment of Sb125

The levels of Te125 have been studied using Sb125 nuclei, polarized at T=O.014°K in an iron lattice, and Ge (Li) detectors. The magnetic moment of Sb125 was determined as (2.59±O.03) PtN. Levels (spins) were assigned at 35.9(1+), 145.4(lj-), 322.2(j-), 443.7(probably i+), 462.5(!+), 525.4(probably !-), 636.1 (i+), 642.3 (i+), 671.6(!+) (energies in keY). The even-parity levels could be identifi...