Improved short-range correlations and 0 neutrino beta beta nuclear matrix elements of Ge-76 and Se-82
Improved short-range correlations and 0 neutrino beta beta nuclear matrix elements of Ge-76 and Se-82
复制标题
改善 Ge-76 和 Se-82 的短程相关性和 0 中微子 β β 核基质元素
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
J. Suhonen
中科院分区：
文献类型：
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作者：
M. Kortelainen;J. Suhonen
我们计算了无中微子双β（$0
uetaeta$）衰变的$^{76}$Ge和$^{82}$Se的光中微子交换机制。在质子-中子准粒子无规相近似（pnQRPA）下，利用真实的二体力得到了原子核的波函数。我们包括来自核子的有限大小，来自核子弱流的高阶项，以及来自核子-核子短程关联的影响。最重要的是，我们改进了目前可用的计算取代基本Jastrow短程相关的更先进的酉相关算子方法（UCOM）。UCOM校正的矩阵元素原来是显着大于Jastrow校正的幅度。这对0美元的可探测性产生了严重的后果。
ueta在当前和未来的双β实验中的β衰变。
We calculate the nuclear matrix elements of the neutrinoless double beta ($0
uetaeta$) decays of $^{76}$Ge and $^{82}$Se for the light-neutrino exchange mechanism. The nuclear wave functions are obtained by using realistic two-body forces within the proton-neutron quasiparticle random-phase approximation (pnQRPA). We include the effects that come from the finite size of a nucleon, from the higher-order terms of nucleonic weak currents, and from the nucleon-nucleon short-range correlations. Most importantly, we improve on the presently available calculations by replacing the rudimentary Jastrow short-range correlations by the more advanced unitary correlation operator method (UCOM). The UCOM corrected matrix elements turn out to be notably larger in magnitude than the Jastrow corrected ones. This has drastic consequences for the detectability of $0
uetaeta$ decay in the present and future double beta experiments.