Level structure of S31 via S32(p,d)S31
Level structure of S31 via S32(p,d)S31
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S31 通过 S32(p,d)S31 的层结构
DOI：
10.1103/physrevc.102.045806
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发表时间：
2020
影响因子：
3.1
通讯作者：
Seiler, D.
中科院分区：
文献类型：
--
作者：
Setoodehnia, K.;Chen, A. A.;Chen, J.;Clark, J. A.;Deibel, C. M.;Hendriks, J.;Kahl, D.;Lennard, W. N.;Parker, P. D.;Seiler, D.
背景：质子非束缚态的性质决定了反应速率，对经典新星和I型X射线爆发中的氢爆炸燃烧有重要影响。尽管以前的一些研究，仍然存在不确定性的核结构附近的质子threshold.Purpose：的能级结构已经目前通过带电粒子光谱实验使用reaction.Method：氘对应于激发态与MeV的动量分析通过Enge分裂极光谱仪在6个实验室角度之间和。在MeV下测量了反应的微分截面。扭曲波玻恩近似计算进行约束的几个观测level.Results的自旋宇称assignments：我们已经检测到72激发态，其中17个是在天体物理区域内的兴趣对应的温度范围为0.1-1.5 GK。我们已经解决了自旋和宇称的激发态与keV的差异，表明它不是，因此，这种状态对反应速率的贡献可能比以前认为的要小得多，因为填充这种激发态所需的角动量转移更大。此外，我们的测量结果有助于巩固自旋宇称分配为6377和6636千电子伏的状态。结论：这项工作提出了最全面的自旋宇称分配迄今为止从一个单中子转移反应ontoexcited状态之间的区域6至7兆电子伏的激发能量。这一区域对于确定新星中氢爆炸燃烧的温度特征范围内的反应速率具有重要意义。
Background:Properties of proton-unboundstates determine thereaction rate, which has a significant impact on explosive hydrogen burning in classical novae and type-I x-ray bursts. Despite several previous studies, uncertainties still remain with respect to the nuclear structure ofnear the proton threshold.Purpose:The level structure ofhas been presently investigated via a charged-particle spectroscopy experiment using thereaction.Method:Deuterons corresponding toexcited states withMeV were momentum analyzed via an Enge split-pole spectrograph at six laboratory angles betweenand. Differential cross sections of thereaction were measured atMeV. Distorted-wave Born approximation calculations were performed to constrain the spin-parity assignments of several of the observed levels.Results:We have detected 72 excited states of, out of which 17 are within the astrophysical region of interest corresponding to the temperature range of 0.1–1.5 GK. We have resolved the discrepancy in the spin and parity of an excited state withkeV, showing that is it not, and therefore the contribution of this state to thereaction rate is likely much less significant than previously thought owing to the larger angular-momentum transfer required to populate this excited state. Moreover, our measurement results help consolidate the spin-parity assignments for the 6377 and 6636 keV states in.Conclusions:This work presents the most comprehensive spin-parity assignments to date from a single-neutron transfer reaction ontoexcited states in the region between 6 to 7 MeV excitation energy. This region is significant for the determination of thereaction rate over the temperatures characteristic of explosive hydrogen burning in novae.