标题： 中子素电流对无中微子双β衰变的额外贡献 显示英文标题

标题： Additional Nucleon Current Contributions to Neutrinoless Double Beta Decay

摘要： 我们研究了动量依赖的诱导核子电流，如弱磁性和赝标耦合，对无中微子双β衰变振幅的重要性，在轻和重马约拉纳中微子机制以及马约拉纳发射机制中。这些效应预计会在所有核模型中出现，使轻中微子矩阵元减少约30%。为了验证这一点，我们在pn-RQRPA框架内计算了实验感兴趣的核A = 76、82、96、100、116、128、130、136和150的核矩阵元。我们发现这些修正确实因核而异，但在所有情况下都大于25%。在重中微子的情况下，效果要大得多（因子为3）。将我们的结果与目前可用的最佳实验限制结合，我们得出了新的有效中微子质量（轻和重）以及有效马约拉纳耦合常数的限制。 显示英文摘要

摘要： We have examined the importance of momentum dependent induced nucleon currents such as weak-magnetism and pseudoscalar couplings to the amplitude of neutrinoless double beta decay in the mechanisms of light and heavy Majorana neutrino as well as in that of Majoron emission. Such effects are expected to occur in all nuclear models in the direction of reducing the light neutrino matrix elements by about 30%. To test this we have performed a calculation of the nuclear matrix elements of the experimentally interesting nuclei A = 76, 82, 96, 100, 116, 128, 130, 136 and 150 within the pn-RQRPA. We have found that indeed such corrections vary somewhat from nucleus to nucleus, but in all cases they are greater than 25 percent. In the case of heavy neutrino the effect is much larger (a factor of 3). Combining out results with the best presently available experimental limits on the half-life of the neutrinoless double beta decay we have extracted new limits on the effective neutrino mass (light and heavy) and the effective Majoron coupling constant.