arXiv 0710.07192007-10-03nucl-ex

与无中子双β衰变有关的原子核结构：~（76）Ge和~（76）Se

Nuclear Structure Relevant to Neutrinoless Double Beta Decay: 76Ge and 76Se

J. P. Schiffer, S. J. Freeman, J. A. Clark, C. Deibel, C. R. Fitzpatrick, S. Gros, A. Heinz, D. Hirata, C. L. Jiang, B. P. Kay, A. Parikh, P. D. Parker, K. E. R… 展开作者

J. P. Schiffer, S. J. Freeman, J. A. Clark, C. Deibel, C. R. Fitzpatrick, S. Gros, A. Heinz, D. Hirata, C. L. Jiang, B. P. Kay, A. Parikh, P. D. Parker, K. E. Rehm, A. C. C. Villari, V. Werner, C. Wrede

备注：: 4 pages, 3 figures
发表信息：: Phys.Rev.Lett.100:112501,2008
DOI：: 10.1103/PhysRevLett.100.112501

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摘要：

如果核基质元素已知，那么观测到无中微子双β衰变的可能性就提供了确定中微子质量的机会。理论计算是不确定的，测量衰变中活跃的核子对价轨道的占据是很重要的。通过精确测量加中子转移反应和去中子转移反应的截面，确定了~（76）Ge和~（76）Se基态价中子轨道的占位。我们的结果表明，费米面是更扩散比理论（QRPA）计算。我们发现，至少有三个轨道的人口显着变化之间的这两个基态，而在计算中的变化主要局限于一个轨道。

英文摘要：

The possibility of observing neutrinoless double beta decay offers the opportunity of determining the neutrino mass IF the nuclear matrix element were known. Theoretical calculations are uncertain and measurements of the occupations of valence orbits by nucleons active in the decay can be important. The occupation of valence neutron orbits in the ground states of 76Ge and 76Se were determined by precisely measuring cross sections for both neutron-adding and removing transfer reactions. Our results indicate that the Fermi surface is much more diffuse than in theoretical (QRPA) calculations. We find that the populations of at least three orbits change significantly between these two ground states while in the calculations the changes are confined primarily to one orbit.

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