β+ Gamow-Teller Strengths from Unstable O14 via the (d,He2) Reaction in Inverse Kinematics
β+ Gamow-Teller Strengths from Unstable O14 via the (d,He2) Reaction in Inverse Kinematics
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不稳定 O14 通过逆运动学中 (d,He2) 反应的 β Gamow-Teller 强度
DOI：
10.1103/physrevlett.130.232301
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发表时间：
2023
影响因子：
8.6
通讯作者：
Chen, J.
中科院分区：
文献类型：
--
作者：
Giraud, S.;Zamora, J. C.;Zegers, R. G. T.;Bazin, D.;Ayyad, Y.;Bacca, S.;Beceiro-Novo, S.;Brown, B. A.;Carls, A.;Chen, J.
反应首次成功地应用于逆运动学中，从不稳定核的方向提取伽莫夫-泰勒转变强度。这项新技术是通过使用主动目标时间投影室和磁谱仪而实现的，并为解决包括天体物理学和中微子物理学在内的一系列科学挑战开辟了道路。在这封信中，我们研究了原子核，并提取了高达 22 MeV 的激发能的伽莫夫-泰勒跃迁强度。将数据与壳模型和最先进的耦合簇计算进行比较。应用唯象淬灭因子后，壳模型计算可以相当好地再现测量到的伽莫夫泰勒强度分布，高达约 15 MeV。为了更好地理解这种猝灭，耦合团簇计算向前迈出了重要一步，由于模型空间大、包含强相关性以及通过二体电流将弱相互作用耦合到两个核子，因此耦合团簇计算在没有这种猝灭的情况下很好地再现了完整的强度分布。
For the first time, thereaction was successfully used in inverse kinematics to extract the Gamow-Teller transition strength in thedirection from an unstable nucleus. The new technique was made possible by the use of an active-target time-projection chamber and a magnetic spectrometer, and opens a path to addressing a range of scientific challenges, including in astrophysics and neutrino physics. In this Letter, the nucleus studied was, and the Gamow-Teller transition strength towas extracted up to an excitation energy of 22 MeV. The data were compared to shell-model and state-of-the-art coupled-cluster calculations. Shell-model calculations reproduce the measured Gamow-Teller strength distribution up to about 15 MeV reasonably well, after the application of a phenomenological quenching factor. In a significant step forward to better understand this quenching, the coupled-cluster calculation reproduces the full strength distribution well without such quenching, owing to the large model space, the inclusion of strong correlations, and the coupling of the weak interaction to two nucleons through two-body currents.