摘要:
通过熔合蒸发反应
181Ta(
16O,5n)
192Tl,在入射束流为97 MeV能量下,布居
192Tl的高自旋态,更新了
192Tl的能级纲图。共增加8条新能级,尝试性地指定了能级自旋,将负宇称晕带的能级推高到23-
ħ。讨论了
192Tl与相邻同位素奇奇核
194,196,198Tl负宇称晕带的旋称劈裂与反转现象,发现随着中子数增加,
196,198Tl在高自旋处出现了旋称反转,其原因可能是由于中子质子相互作用与科里奥利力相互竞争所致。
High spin states of
192Tl were populated by the
181Ta(
16O, 5n)
192Tl heavy ion fusion evaporation reaction at 97 MeV beam energy. A new level scheme with 8 new levels was constructed and the level spins were tentatively assigned. The negative yrast band was extended up to 23-
ħ. Systematics of signature of inversion were also discussed for the negative yrast band of odd-odd Tl istopes. Signature inversion has been found in
196,198Tl with neutron number increasing in these four Tl isotopes, and it is explained by the competition between the strength of n-p interaction and Coriolis force.