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Single- and Double-Charge Exchange Reactions and Nuclear Matrix Element for Double-Beta Decay
Universe ( IF 2.5 ) Pub Date : 2022-09-02 , DOI: 10.3390/universe8090457
Hiroyasu Ejiri

Neutrino properties such as the Majorana nature and the masses, which go beyond the standard model, are derived from the experimental double-beta decay (DBD) rate by using the DBD nuclear matrix element (NME). Theoretical evaluations for the NME, however, are very difficult. Single-charge exchange reactions (SCERs) and double-charge exchange reactions (DCERs) are used to study nuclear isospin (τ) and spin (σ) correlations involved in the DBD NME and to theoretically calculate the DBD NME. Single and double τσ NMEs for quasi-particle states are studied by SCERs and DCER. They are found to be reduced with respect to the quasi-particle model NMEs due to the τσ correlations. The impact of the SCER- and DCER-NMEs on the DBD NME is discussed.

中文翻译:

单电荷和双电荷交换反应和双β衰变的核基质元素

马约拉纳性质和质量等超出标准模型的中微子性质是通过使用 DBD 核基质元素 (NME) 从实验双β衰变 (DBD) 速率推导出来的。然而,对 NME 的理论评估非常困难。单电荷交换反应 (SCER) 和双电荷交换反应 (DCER) 用于研究核同位旋(τ) 和旋转 (σ) DBD NME 中涉及的相关性和理论上计算 DBD NME。单双τσSCER 和 DCER 研究了准粒子状态的 NME。发现它们相对于准粒子模型 NME 是减少的,因为τσ相关性。讨论了 SCER-和 DCER-NME 对 DBD NME 的影响。
更新日期:2022-09-02
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