Deformation effects and neutrinoless positron {beta}{beta} decay of {sup 96}Ru, {sup 102}Pd, {sup 106}Cd, {sup 124}Xe, {sup 130}Ba, and {sup 156}Dy isotopes within a mechanism involving Majorana neutrino mass

• Published in: Physical review. C, Nuclear physics Nuclear physics, 2009-10, Vol.80 (4)
• Main Authors: Rath, P. K., Chandra, R., Department of Physics and Meteorology, IIT, Kharagpur-721302, Chaturvedi, K., Department of Physics, Bundelkhand University, Jhansi-284128, Raina, P. K., Hirsch, J. G.
• Format: Article
• Language: English
• Subjects: BARIUM 130; CADMIUM 106; CORRELATIONS; DOUBLE BETA DECAY; DYSPROSIUM 156; HALF-LIFE; HARTREE-FOCK-BOGOLYUBOV THEORY; MASS; MATRIX ELEMENTS; NEUTRINOS; NUCLEAR PHYSICS AND RADIATION PHYSICS; PALLADIUM 102; POSITRONS; QUADRUPOLE MOMENTS; RELIABILITY; RUTHENIUM 96; SPECTRA; TEARING INSTABILITY; WAVE FUNCTIONS; XENON 124
• ISSN: 0556-2813; 1089-490X
• DOI: 10.1103/PHYSREVC.80.044303

The ({beta}{sup +}{beta}{sup +}){sub 0{nu}} and ({epsilon}{beta}{sup +}){sub 0{nu}} modes of {sup 96}Ru, {sup 102}Pd, {sup 106}Cd, {sup 124}Xe, {sup 130}Ba, and {sup 156}Dy isotopes are studied in the projected Hartree-Fock-Bogoliubov framework for the 0{sup +}{yields}0{sup +} transition. The reliability of the intrinsic wave functions required to study these decay modes has been established in our earlier works by obtaining an overall agreement between the theoretically calculated spectroscopic properties, namely yrast spectra, reduced B(E2:0{sup +}{yields}2{sup +}) transition probabilities, quadrupole moments Q(2{sup +}) and gyromagnetic factors g(2{sup +}), and the available experimental data in the parent and daughter even-even nuclei. In the present work, the required nuclear transition matrix elements are calculated in the Majorana neutrino mass mechanism using the same set of intrinsic wave functions as used to study the two neutrino positron double-{beta} decay modes. Limits on effective light neutrino mass and effective heavy neutrino mass are extracted from the observed limits on half-lives T{sub 1/2}{sup 0{nu}}(0{sup +}{yields}0{sup +}) of ({beta}{sup +}{beta}{sup +}){sub 0{nu}} and ({epsilon}{beta}{sup +}){sub 0{nu}} modes. We also investigate the effect of quadrupolar correlations vis-a-vis deformation on nuclear transition matrix elements (NTMEs) required to study the ({beta}{sup +}{beta}{sup +}){sub 0{nu}} and ({epsilon}{beta}{sup +}){sub 0{nu}} modes.