Systematic study of beta and double beta decay to excited final states

Aunola, M.; Suhonen, J.

doi:10.1016/0375-9474(96)00087-5

Systematic study of beta and double beta decay to excited final states

M. Aunola
(
- Jyvaskyla U.
)
,
J. Suhonen
(
- Jyvaskyla U.
)

1996

34 pages

Published in:

Nucl.Phys.A 602 (1996) 133-166

DOI:

10.1016/0375-9474(96)00087-5

View in:

Nuclear Science References

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Abstract: (Elsevier)

A systematic study of the two-neutrino double beta (2νββ) decay to the final ground state and excited states is performed within an extension of the quasiparticle random-phase approximation (QRPA) model. In this extension, the multiple commutator model (MCM), a simultaneous treatment of the double-odd and double-even nuclei is possible by assuming their states to have the structure of one or two QRPA phonons. The MCM calculation is done for nine 2 νβ − β − decays and six 2νECEC decays, and systematics of the relevant matrix elements and half-lives have been created. The study of the 2νββ-decay rates is complemented with the MCM study of the single-beta-decay properties of the relevant nuclei within the double-beta isobaric chains. The Woods-Saxon single-particle energies have been corrected near the Fermi surface by comparing the BCS quasiparticle energies with spectroscopic data of odd-mass nuclei. Pairing gaps, energy systematics of the Gamow-Teller states and the available beta-decay data have been used to obtain effective, model-space adapted, two-body matrix elements starting from the G -matrix elements of the Bonn one-boson-exchange potential. This enables a parameter-free calculation of the double Gamow-Teller matrix elements and theoretical prediction of double-beta half-lives.

double-beta decay: (2neutrino)
(2neutrino): double-beta decay
double-beta decay: (0neutrino)
(0neutrino): double-beta decay
random phase approximation
excited nucleus: energy levels
numerical calculations
tables
bibliography

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