FIZIKA B 5 (1996) 2, 93-101

NON-COLLAPSING QUASIPARTICLE RANDOM PHASE APPROXIMATION FOR NUCLEAR DOUBLE-BETA DECAY Work supported in part by Fundacion Antorchas (Argentina)

F. KRMPOTIĆ^a, A. MARIANO^a, E. J. V. de PASSOS^b, A. F. R. de TOLEDO PIZA^b and T. T. S. KUO^c
aDepartamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C. C. 67, 1900 La Plata, Argentina
^bInstituto de Física, Universidade de Sao Paulo, C.P. 20516, 01498 Sâo Paulo, Brasil
^cPhysics Department, State University of New York at Stony Brook, Stony Brook, NY 11794-3800, USA

Received 12 April 1996

We show how the longstanding problem of the collapse of the charge-exchange 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 two-neutrino double beta decay in the ¹⁰⁰Mo ® ¹⁰⁰Ru system. The question of the conservation of the Ikeda sum rule is also addressed within the new formalism.

UDC 539.16
PACS 23.40.Hc, 21.60.Jz

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