OMC4DBD: ordinary muon capture studies for the matrix elements in double beta decays

为了研究136-Ba、76-Se和96-Mo三种富集同位素对无中微子双β衰变（DBD）的中微子核响应，本项目拟测量几种富集同位素的普通μ子捕获（OMC）。这项工作扩展了我们对dbd核子核的OMC测量计划，旨在改进中子bb衰变过程的核矩阵元素（NME）的计算，以及我们对该过程中g_A猝灭的理解。在实验中，将研究OMC的介子绝对寿命和放射性产生率。在μ子捕获之后，高纯度的锗探测器将用于记录伽马射线的能量和时间分布。测量的绝对寿命和相对强度分布将证实绝对捕获强度是激发能的函数，并将有助于将壳模型计算扩展到重DBD同位素质量区域和超新星研究。

In this project is proposed to measure the ordinary muon capture (OMC) on several enriched isotopes in order to investigate neutrino nuclear responses for neutrinoless double beta decay (DBD), namely 136-Ba, 76-Se and 96-Mo. This work extends our program of OMC measurements for daughter nuclei of DBD-nuclei aimed to improve calculations of nuclear matrix elements (NME) of neutrinoles bb-decay process as well as our understanding of g_A quenching in this process. The muon absolute lifetime and radioactive production rate for OMC will be studied during the experiment. High-purity Ge detectors will be used to register the energy and time distribution of gamma-rays, following muon capture. The measured absolute lifetime together with the relative strength distribution will confirm the absolute capture strength as a function of the excitation energy and will help to extend shell model calculations to the heavy DBD isotope mass region and Supernova studies.