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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