Vaquero V, Jungclaus A, Aumann T, Tscheuschner J, Litvinova E V, Tostevin J A, Baba H, Ahn D S, Avigo R, Boretzky K, Bracco A, Caesar C, Camera F, Chen S, Derya V, Doornenbal P, Endres J, Fukuda N, Garg U, Giaz A, Harakeh M N, Heil M, Horvat A, Ieki K, Imai N, Inabe N, Kalantar-Nayestanaki N, Kobayashi N, Kondo Y, Koyama S, Kubo T, Martel I, Matsushita M, Million B, Motobayashi T, Nakamura T, Nakatsuka N, Nishimura M, Nishimura S, Ota S, Otsu H, Ozaki T, Petri M, Reifarth R, Rodríguez-Sánchez J L, Rossi D, Saito A T, Sakurai H, Savran D, Scheit H, Schindler F, Schrock P, Semmler D, Shiga Y, Shikata M, Shimizu Y, Simon H, Steppenbeck D, Suzuki H, Sumikama T, Symochko D, Syndikus I, Takeda H, Takeuchi S, Taniuchi R, Togano Y, Tsubota J, Wang H, Wieland O, Yoneda K, Zenihiro J, Zilges A
Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain.
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
Phys Rev Lett. 2020 Jan 17;124(2):022501. doi: 10.1103/PhysRevLett.124.022501.
Spectroscopic factors of neutron-hole and proton-hole states in ^{131}Sn and ^{131}In, respectively, were measured using one-nucleon removal reactions from doubly magic ^{132}Sn at relativistic energies. For ^{131}In, a 2910(50)-keV γ ray was observed for the first time and tentatively assigned to a decay from a 5/2^{-} state at 3275(50) keV to the known 1/2^{-} level at 365 keV. The spectroscopic factors determined for this new excited state and three other single-hole states provide first evidence for a strong fragmentation of single-hole strength in ^{131}Sn and ^{131}In. The experimental results are compared to theoretical calculations based on the relativistic particle-vibration coupling model and to experimental information for single-hole states in the stable doubly magic nucleus ^{208}Pb.
分别利用相对论能量下从双幻核(^{132}Sn)进行的单核子移除反应，测量了(^{131}Sn)和(^{131}In)中中子空穴态和质子空穴态的光谱因子。对于(^{131}In)，首次观测到一条能量为(2910(50) keV)的γ射线，并初步判定其为从能量为(3275(50) keV)的(5/2^-)态到已知的能量为(365 keV)的(1/2^-)能级的跃迁。为这个新的激发态和其他三个单空穴态确定的光谱因子，首次证明了(^{131}Sn)和(^{131}In)中单空穴强度的强烈碎片化。将实验结果与基于相对论粒子-振动耦合模型的理论计算以及稳定双幻核(^{208}Pb)中单空穴态的实验信息进行了比较。
