Ab Initio Treatment of Collective Correlations and the Neutrinoless Double Beta Decay of ^{48}Ca.
Ab Initio Treatment of Collective Correlations and the Neutrinoless Double Beta Decay of ^{48}Ca.
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DOI：
10.1103/physrevlett.124.232501
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发表时间：
2019-08
影响因子：
8.6
通讯作者：
J. Yao;B. Bally;J. Engel;R. Wirth;T. R. Rodríguez;H. Hergert
中科院分区：
文献类型：
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作者：
J. Yao;B. Bally;J. Engel;R. Wirth;T. R. Rodríguez;H. Hergert
利用手征有效场论中的哈密顿量，将介质内相似重整化群与生成坐标方法相结合，建立了一个描述任意形变中质量核的新框架.该方法利用了第一种方法捕获动态相关性的能力，第二种方法包括集体相关性而不违反对称性。我们用我们的方案计算了控制^{48}Ca到^{48}Ti的无中微子双β衰变的矩阵元，发现它的值为0.61，接近或低于大多数唯象方法的预测。这一结果为重核如^{76}Ge、^{130}Te和^{136}Xe衰变的矩阵元的从头计算打开了大门。
Working with Hamiltonians from chiral effective field theory, we develop a novel framework for describing arbitrary deformed medium-mass nuclei by combining the in-medium similarity renormalization group with the generator coordinate method. The approach leverages the ability of the first method to capture dynamic correlations and the second to include collective correlations without violating symmetries. We use our scheme to compute the matrix element that governs the neutrinoless double beta decay of ^{48}Ca to ^{48}Ti, and find it to have the value 0.61, near or below the predictions of most phenomenological methods. The result opens the door to ab initio calculations of the matrix elements for the decay of heavier nuclei such as ^{76}Ge, ^{130}Te, and ^{136}Xe.