

FIZIKA B 5 (1996) 2, 93101 NONCOLLAPSING QUASIPARTICLE RANDOM PHASE APPROXIMATION FOR NUCLEAR DOUBLEBETA DECAY Work supported in part by Fundacion Antorchas (Argentina)F. KRMPOTIÆ^{a}, A. MARIANO^{a}, E. J. V. de PASSOS^{b},
A. F. R. de TOLEDO PIZA^{b} and T. T. S. KUO^{c} Received 12 April 1996We show how the longstanding problem of the collapse of the chargeexchange QRPA near the physical value of the force strength can be circumvented. This is done by including the effect of ground state correlations into the QRPA equations of motion. The corresponding formalism, called renormalized QRPA, is briefly outlined and its consequences are discussed in the framework of a schematic model for the twoneutrino double beta decay in the ^{100}Mo ® ^{100}Ru system. The question of the conservation of the Ikeda sum rule is also addressed within the new formalism. UDC 539.16

Copyright by The Croatian Physical Society
