^(146)Tb的能级结构研究

Study of Level Structure in ^(146)Tb

利用能量为161—175MeV的^(32)S束流,通过反应^(118)Sn(^(32)S,1p3n)^(146)Tb研究了双奇核^(146)Tb的高自旋态能级结构。实验进行了γ射线的激发函数、γ射线的各向异性度、X-γ和γ-γ-t符合测量。基于这些测量结果,建立了激发能达8390kev的^(146)Tb核的能级纲图,其中包括新发现的41条γ射线和新建立的27个能级,并指定了^(146)Tb新发现能级的自旋值。用一个h_(11/2)价质子和一个h_(11/2)^(-1)价中子空穴耦合、πh_(11/2)υh_(11/2)^(-1)与^(146)Gd核实激发态的耦合对^(146)Tb的能级结构进行了定性地讨论。

The level structure of high-spin states of doubly odd nucleus l46Tb has been studied via the 118Sn (32S, 1p3n) Tb reaction using techniques of in-beam y-ray spectroscopy. Measurements of r-ray excitation functions, y-ray anisotropies, X-r and r-r-t coincidences were performed with 12 BGO(AC)HPGe detectors. Based on the gated spectra, r-r coincidence relationships, intensity balances and cross-over transitions, the level scheme in Tb has been extended up to an excitation energy of 8390 keV, and 41 new 7-rays are added into the level scheme. The spins for the new established levels have been assigned according to the results of the measured 7-ray anisotropies. The levels in Tb are interpreted qualitatively by coupling a h11/2 proton to a h11/2 neutron hole and h11/2 u h11/2 -1 to the excited states in 146Gd core.