Testing shell-model interactions at high excitation energy and low spin: Nuclear resonance fluorescence in Ge74
Testing shell-model interactions at high excitation energy and low spin: Nuclear resonance fluorescence in Ge74
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DOI：
10.1103/physrevc.108.024315
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发表时间：
2023-08
影响因子：
3.1
通讯作者：
S. Johnson;R. Janssens;U. Friman-Gayer;B. A. Brown;B. Crider;S. Finch;Krishichayan;D. Little;S. Mukhopadhyay;E. Peters;A. Ramirez;J. Silano;A. Tonchev;W. Tornow;S. Yates
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文献类型：
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作者：
S. Johnson;R. Janssens;U. Friman-Gayer;B. A. Brown;B. Crider;S. Finch;Krishichayan;D. Little;S. Mukhopadhyay;E. Peters;A. Ramirez;J. Silano;A. Tonchev;W. Tornow;S. Yates
锗同位素具有复杂的低自旋结构，积累了大量挑战核模型的实验数据。同位素的结构研究在这里与核共振荧光作为一个广泛的运动的实验测试的壳模型在锗同位素链使用一些互补技术的一部分。能级是用由Tunl的高强度γ射线源提供的MeV光子束激发的。许多新的水平被确定和他们的自旋，宇称，分支比，和相关的散射截面值被确定。大规模的壳模型计算，其中包括jj44b和JUN45有效的相互作用来描述在这个质量区域的核，预测令人满意的新数据。这项研究扩展了这两个相互作用的验证，这是候选人的矩阵元素的计算中使用的解释中微子双衰变实验，到低自旋，高激发能域。
With their complex low-spin structure, the germanium isotopes have accrued a large number of experimental data which challenge nuclear models. The structure of theisotope is investigated here with nuclear resonance fluorescence as part of an extensive campaign of experimental tests of the shell model in the germanium isotopic chain using a number of complementary techniques. Levels were excited withMeV photon beams provided by the High Intensity Gamma-Ray Source at TUNL. Many new levels were identified and their spins, parities, branching ratios, and associated scattering cross section values were determined. Large-scale shell-model calculations, which include jj44b and JUN45 effective interactions developed to describe nuclei in this mass region, predict the new data satisfactorily. This study extends the validation of these two interactions, which are candidates for computation of matrix elements to be used in the interpretation of neutrinoless double-decay experiments in, into the low-spin, high excitation energy domain.