| Autor: |
Rodin, VA, Urin, MH, Faessler, A |
| Přispěvatelé: |
KVI - Center for Advanced Radiation Technology |
| Jazyk: |
angličtina |
| Rok vydání: |
2005 |
| Předmět: |
|
| Zdroj: |
Nuclear Physics A, 747(2-4), 295-307. ELSEVIER SCIENCE BV |
| ISSN: |
0375-9474 |
| Popis: |
Making use of an identity transformation independent of a nuclear model, we represent the 2vbetabeta-amplitude as a sum of two terms. One term accounts for most of the sensitivity of the original 2vbetabeta-amplitude to g'(pp) for realistic g'(pp) similar or equal to 1 (with g'(pp) being the ratio of the triplet and singlet p-p interaction strengths) and is determined by a specific energy-weighted sum rule. The sum rule depends only on the particle-particle residual interaction (being linear function of g'(pp) in the QRPA) and passes through zero at the point g'(pp) = 1 where the Wigner SU(4) symmetry is restored in the p-p sector of the Hamiltonian. The second term in the decomposition of the 2vbetabeta-amplitude is demonstrated within the QRPA to be a much smoother function for the realistic values of g'(pp) than the original 2vbetabeta-amplitude. This term is mainly determined by the intensity of the spin-orbit interaction of the nuclear mean field. Thus, the analysis of the present work reveals the reasons for the sensitivity of the 2vbetabeta-amplitude to different components of the nuclear Hamiltonian and thereby can help in constraining nuclear model uncertainties in calculations of the amplitude. (C) 2004 Elsevier B.V. All rights reserved. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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