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首页> 外文期刊>Physical review, C >Improved description of the 2 nu beta beta-decay and a possibility to determine the effective axial-vector coupling constant
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Improved description of the 2 nu beta beta-decay and a possibility to determine the effective axial-vector coupling constant

机译：改进了2 Nu Betaβ衰减的描述以及确定有效轴向矢量耦合常数的可能性

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摘要

An improved formalism of the two-neutrino double-beta decay (2 nu beta beta-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 2 nu beta beta-decayrate and differential characteristics depend on additional phase-space factors weighted by the ratios of 2 nu beta beta-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 2 nu beta beta-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 2 nu beta beta-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 2 nu beta beta-decay predicts slightly suppressed 2 nu beta beta-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(A)(eff) is proposed.
机译：提出了两性双β衰变（2 Nu Beta Beta-Decay）率的改进的形式主义，这考虑了通过泰勒膨胀的能量分母对Lepton能量的依赖性。到目前为止，只考虑了这种扩展中的领先术语。修订后的2 Nu Betaβ-衰减和差异特征依赖于通过能量分母的不同功率的2 Nuββ - 衰减核基质元素的比例加权的另外的相位空间因子。对于实验性兴趣的核来，通过使用具有有限核尺寸和电子筛选的精确狄拉克函数来计算所有相空间因子。对于具有测量的2元ββ-衰减的同位素，半衰期所涉及的核基质元素在Quasiparticle随机阶段近似下用部分旋流恢复确定。建立了矫正术语对2 NUββ衰减率引起的2 Nu Betaβ衰减率的重要性，并讨论了单和总和电子能源分布形状的改变。发现改进的2 NUββ-衰变的计算预测到中微子双β衰减信号略微抑制2 NUββ衰减背景。此外，提出了一种确定核培养基（A）（EFF）中有效弱耦合常数的方法的方法。

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