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-(h).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.
Abstract:
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-h.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.
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