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Beyond-mean-field approaches for nuclear neutrinoless double beta decay in the standard mechanism
Progress in Particle and Nuclear Physics ( IF 9.6 ) Pub Date : 2022-04-29 , DOI: 10.1016/j.ppnp.2022.103965
J.M. Yao 1, 2 , J. Meng 3, 4 , Y.F. Niu 5 , P. Ring 6
Affiliation  

Nuclear weak decays provide important probes to fundamental symmetries in nature. A precise description of these processes in atomic nuclei requires comprehensive knowledge on both the strong and weak interactions in the nuclear medium and on the dynamics of quantum many-body systems. In particular, an observation of the hypothetical double beta decay without emission of neutrinos (0νββ) would unambiguously demonstrate the Majorana nature of neutrinos and the existence of the lepton-number-violation process. It would also provide unique information on the ordering and absolute scale of neutrino masses. The next-generation tonne-scale experiments with sensitivity up to 1028 years after a few years of running will probably provide a definite answer to these fundamental questions based on our current knowledge on the nuclear matrix element (NME), the precise determination of which is a challenge to nuclear theory. Beyond-mean-field approaches have been frequently adapted for the study of nuclear structure and decay throughout the nuclear chart for several decades. In this review, we summarize the status of beyond-mean-field calculations of the NMEs of 0νββ decay assuming the standard mechanism of an exchange of light Majorana neutrinos. The challenges and prospects in the extension and application of beyond-mean-field approaches for 0νββ decay are discussed.



中文翻译:

标准机制中核无中微子双β衰变的超平均场方法

核弱衰变为自然界的基本对称性提供了重要的探索。对原子核中这些过程的精确描述需要全面了解核介质中的强相互作用和弱相互作用以及量子多体系统的动力学。特别是,在没有中微子发射的情况下观察到假设的双β衰变(0νββ) 将明确证明中微子的马约拉纳性质和轻子数违反过程的存在。它还将提供有关中微子质量的排序和绝对规模的独特信息。下一代吨级实验,灵敏度高达1028基于我们目前对核基质元素 (NME) 的了解,经过几年的运行,可能会为这些基本问题提供明确的答案,其精确测定是对核理论的挑战。几十年来,超平均场方法经常被用于研究整个核图的核结构和衰变。在这篇综述中,我们总结了 NME 的超平均场计算的状态0νββ假设光马约拉纳中微子交换的标准机制。超平均场方法推广应用的挑战与展望0νββ衰变进行了讨论。

更新日期:2022-04-29
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