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arXiv 1709.05313nucl-th
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用基于哈密顿的generator坐标方法计算$^{124}$ Sn、$^{130}$ Te和$^{136}$的无中子双$β$衰变

Neutrinoless double-$β$ decay of $^{124}$Sn, $^{130}$Te, and $^{136}$Xe in the Hamiltonian-based generator-coordinate method

C. F. Jiao, M. Horoi, A. Neacsu

摘要:

我们提出了一个生成坐标方法来计算实际的壳模型哈密顿量,它非常接近于全壳模型计算$^{124}$ Sn,$^{130}$ Te和$^{136}$ Sn的无中微子双$β$衰变的矩阵元。我们不仅处理四极形变,而且质子-中子对振幅作为发电机坐标。我们通过计算和比较光谱量与精确的壳模型结果和实验数据验证了这种方法。与现有的基于能量密度泛函的生成坐标方法相比,我们的基于Hamilton的生成坐标方法产生的$0νββ$矩阵元素更接近壳模型的矩阵元素。$0νββ$核基质元素的剩余高估表明,当使用基于哈密顿的生成坐标方法计算时,可能需要考虑$^{124}$ Sn、$^{130}$ Te和$^{136}$ Sn的额外相关性。该方法的验证为在大壳模型空间中计算$^{150}$ Nd的$0νββ$矩阵元提供了可能。

英文摘要:

We present a generator-coordinate method for realistic shell-model Hamiltonians that closely approximates the full shell model calculations of the matrix elements for the neutrinoless double-$β$ decay of $^{124}$Sn, $^{130}$Te, and $^{136}$Xe. We treat not only quadrupole deformations but also the proton-neutron pairing amplitudes as generator coordinates. We validate this method by calculating and comparing spectroscopic quantities with the exact shell model results and experimental data. Our Hamiltonian-based generator-coordinate method produces $0νββ$ matrix elements much closer to the shell model ones, compared to the existing energy-density-functional-based generator-coordinate approaches. The remaining overestimation of $0νββ$ nuclear matrix element suggests that additional correlations may be needed to be taken into account for $^{124}$Sn, $^{130}$Te, and $^{136}$Xe when calculating with the Hamiltonian-based generator-coordinate method. The validation of this method may open the possibility of calculating $0νββ$ matrix element of $^{150}$Nd in a large shell-model space.

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