Improved description of the 2νββ-decay and a possibility to determine the effective axial-vector coupling constant
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21670%2F18%3A00329996" target="_blank" >RIV/68407700:21670/18:00329996 - isvavai.cz</a>
Result on the web
<a href="http://journals.aps.org/prc/abstract/10.1103/PhysRevC.97.034315" target="_blank" >http://journals.aps.org/prc/abstract/10.1103/PhysRevC.97.034315</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevC.97.034315" target="_blank" >10.1103/PhysRevC.97.034315</a>
Alternative languages
Result language
angličtina
Original language name
Improved description of the 2νββ-decay and a possibility to determine the effective axial-vector coupling constant
Original language description
An improved formalism of the two-neutrino double-beta decay (2νββ-decay) rate is presented, which takes into account the dependence of energy denominators on lepton energies via the Taylor expansion. Until now, only the leading term in this expansion has been considered. The revised 2νββ-decay rate and differential characteristics depend on additional phase-space factors weighted by the ratios of 2νββ-decay nuclear matrix elements with different powers of the energy denominator. For nuclei of experimental interest all phase-space factors are calculated by using exact Dirac wave functions with finite nuclear size and electron screening. For isotopes with measured 2νββ-decay half-life the involved nuclear matrix elements are determined within the quasiparticle random-phase approximation with partial isospin restoration. The importance of correction terms to the 2νββ-decay rate due to Taylor expansion is established and the modification of shape of single and summed electron energy distributions is discussed. It is found that the improved calculation of the 2νββ-decay predicts slightly suppressed 2νββ-decay background to the neutrinoless double-beta decay signal. Furthermore, an approach to determine the value of effective weak-coupling constant in nuclear medium g<sub>A</sub><sup>eff</sup> is proposed.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10304 - Nuclear physics
Result continuities
Project
<a href="/en/project/EF16_013%2F0001733" target="_blank" >EF16_013/0001733: Underground laboratory LSM - Czech participation to European-level research</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
PHYSICAL REVIEW C
ISSN
2469-9985
e-ISSN
2469-9993
Volume of the periodical
97
Issue of the periodical within the volume
3
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
—
UT code for WoS article
000427314100002
EID of the result in the Scopus database
2-s2.0-85044154004