论文标题
NURE:一个ERC项目,用于研究中准双β衰减的核反应
NURE: An ERC project to study nuclear reactions for neutrinoless double beta decay
论文作者
论文摘要
中准双β衰减(0ν\ b {eta} \ b {eta})被认为是确定绝对中微子质量量表的最佳潜在资源。此外,如果观察到,它将表明整个Lepton数量不是保守的,而中微子是他们自己的抗粒子。目前,该物理案例是超越标准模型的最重要的研究之一,可能会指导朝着基本互动的大统一理论的道路。由于\ b {eta} \ b {eta}衰减过程涉及核,因此其分析一定意味着核结构问题。 0ν\ b {eta} \ b {eta}衰减速率可以表示为独立因素的产物:相空间因子,核基质元素(NME)和中微子物种质量的功能。因此,如果测量0ν\ b {eta} \ b {eta}衰减率,则可以提供NME的知识,可以提供中微子质量尺度的信息。在Nure项目中,在欧洲研究委员会的首发授予的支持下,双重电荷交换(DCE)的核反应将用作提取有关\ b {eta} \ b {eta} nme的信息的工具。在DCE反应和\ b {eta} \ b {eta}衰减中,初始核状态和最终核状态相同,过渡算子具有相似的结构。因此,DCE绝对截面的测量可以提供有关\ b {eta} \ b {eta}矩阵元素的关键信息。
Neutrinoless double beta decay (0ν\b{eta}\b{eta}) is considered the best potential resource to determine the absolute neutrino mass scale. Moreover, if observed, it will signal that the total lepton number is not conserved and neutrinos are their own anti-particles. Presently, this physics case is one of the most important research beyond Standard Model and might guide the way towards a Grand Unified Theory of fundamental interactions. Since the \b{eta}\b{eta} decay process involves nuclei, its analysis necessarily implies nuclear structure issues. The 0ν\b{eta}\b{eta} decay rate can be expressed as a product of independent factors: the phase-space factors, the nuclear matrix elements (NME) and a function of the masses of the neutrino species. Thus the knowledge of the NME can give information on the neutrino mass scale, if the 0ν\b{eta}\b{eta} decay rate is measured. In the NURE project, supported by a Starting Grant of the European Research Council, nuclear reactions of double charge-exchange (DCE) will be used as a tool to extract information on the \b{eta}\b{eta} NME. In DCE reactions and \b{eta}\b{eta} decay, the initial and final nuclear states are the same and the transition operators have similar structure. Thus the measurement of the DCE absolute crosssections can give crucial information on \b{eta}\b{eta} matrix elements.