Competition between particle-hole and particle-particle correlations in forbidden electron capture: The case of [Formula Presented]

Physical Review C - Nuclear Physics

Volumn 56, Issue 4, 1997, Pages R1675-R1677

  Bianchetti, M ^a,b   Quaglia, M R ^a,b   Colo G ^a,b   Pizzochero, P M ^a,b   Broglia, R A ^a,b,c   Bortignon, P F ^a,b  

^a UNIVERSITY OF MILAN   (Italy)

^b INFN SEZIONE DI MILANO   (Italy)

^c UNIVERSITY OF COPENHAGEN   (Denmark)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0031534710     PISSN: 05562813     EISSN: 1089490X     Source Type: Journal    
DOI: 10.1103/PhysRevC.56.R1675     Document Type: Article

References (26)

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3. Note that the (Formula presented) 130 isotopes of Tellurium are 2νββ emitters and good candidates for 0νββ. From a nuclear structure point of view, the study of both EC and ββ processes can shed light on the mechanism which is at the basis of the cancellation between particle-hole and particle-particle correlations (cf. 45 and references therein).
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14. In Ref. 10 the numerical values for (Formula presented) are not reported. We have set them equal to 1, as suggested by the systematics of the quoted values.
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19. The order of single particle levels may be deduced from one-particle transfer reactions 16212223. In particular, we assumed a (Formula presented) configuration for the two protons out of the (Formula presented) core in the (Formula presented) ground state 22.
20. Neutron quasiparticle energies in (Formula presented) are taken from Ref. 16. Quasiproton energies in (Formula presented) are given in Ref. 22, and have been referred to the ground state of (Formula presented) according to the scheme followed in Ref. 16. The experimental quasiparticle occupation factors in (Formula presented) are given in Refs. 16212223 and were renormalized in each channel to sum up to the correct number of valence nucleons.
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26. It is well known that this phenomenon is associated with the appearance of a zero energy state, and is a signal of the failure of the standard pn-QRPA model, due to ground state correlations induced by the increasing particle-particle interaction.