论文标题
核密度功能理论中有限振幅方法中两中性双dyd-double-$β$衰减的全局计算
Global calculation of two-neutrino double-$β$ decay within the finite amplitude method in nuclear density functional theory
论文作者
论文摘要
两种中心双β（$2νβ$）的衰减已用于限制有效相互作用的中子蛋白部分部分，进而计算中性中微子双β衰变的核基质元素，其观察结果对基本物理学有重要的后果。我们仔细检查了$2νβ$矩阵元素，其中质子 - 独立式粒子随机相近似具有核能密度函数。我们与全球范围内适合单β-末期半衰期的功能和电荷交换巨型共振能量，但不适合$2ννβ.$ hefm laff laft lass本身，以评估所有重要核的$2νννβ.-核矩阵元素，包括那些半衰期尚未测量过的半衰期。在没有配置截断的大型模型空间中进行的这种全面评估需要有效的计算方案。我们在有限振幅方法中采用双重轮廓集成。结果通常会重现从半衰期中提取的核基质元件，而无需在拟合程序中使用任何半衰期。我们介绍了总共27个核中的基质元素的预测，其半衰期仍未得到测量。
Two-neutrino double-beta ($2νββ$) decay has been used to constrain the neutron-proton part of effective interactions, which in turn is used to compute the nuclear matrix elements for neutrinoless double-beta decay, the observation of which would have important consequences for fundamental physics. We carefully examine $2νββ$ matrix elements within the proton-neutron quasiparticle random-phase approximation with nuclear energy density functionals. We work with functionals that are fit globally to single-beta-decay half-lives and charge-exchange giant-resonance energies, but not to $2νββ$ half-lives themselves, to evaluate the $2νββ$ nuclear matrix elements for all important nuclei, including those whose half-lives have not yet been measured. Such a comprehensive evaluation in large model spaces without configuration truncation requires an efficient computational scheme; we employ a double contour integration within the finite amplitude method. The results generally reproduce the nuclear matrix element extracted from half-lives well, without the use of any of those half-lives in the fitting procedure. We present predictions of the matrix elements in a total of 27 nuclei with half-lives that are still unmeasured.
