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Perturbative treatment of the two neutrino double beta decay to excited 2+ states

O. Civitarese
(
- La Plata U.
)
,
J. Suhonen
(
- Jyvaskyla U.
)

1994

15 pages

Published in:

Nucl.Phys.A 578 (1994) 62-76

DOI:

10.1016/0375-9474(94)90969-5

View in:

Nuclear Science References

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Abstract: (Elsevier)

The two-neutrino double-beta-decay transitions of 76 Ge and 136 Xe to the ground and excited states of the nuclei 76 Se and 136 Ba, respectively, are calculated using a separable proton-neutron interaction. The corresponding nuclear matrix elements are computed by using the quasiparticle random-phase approximation (QRPA). In addition, the coupling between quasiparticles and QRPA phonons, both of the charge-conserving and charge-non-conserving type, is included perturbatively in the calculation of double-beta-decay observables. It is found that these corrections do not change, significantly, the order of magnitude of the matrix elements for the two-neutrino double-beta-decay transitions to the first excited quadrupole state of the daughter nuclei.

double-beta decay: (2neutrino)
(2neutrino): double-beta decay
germanium
xenon
excited nucleus
perturbation theory
p n: interaction
interaction: p n
random phase approximation
charge: conservation law

References(21)

Figures(0)

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