Isomers in 203Tl and core excitations built on a five-nucleon-hole structure
| Autor: | Bothe, V., Tandel, S. K., Wahid, S. G., Srivastava, P. C., Bhoy, Bharti, Chowdhury, P., Janssens, R. V. F., Kondev, F. G., Carpenter, M. P., Lauritsen, T., Seweryniak, D., Zhu, S. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Physical Review C 105, 044327 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevC.105.044327 |
| Popis: | Isomers with three- and five-nucleon-hole configurations have been established in $^{203}$Tl. These include newly identified levels with a three-nucleon structure: {\it I}$^{\pi }$ = (15/2$^{-}$) with {\it T}$_{1/2}$ = 7.9(5) ns, and {\it I}$^{\pi }$ = (35/2$^{-}$) with {\it T}$_{1/2}$ = 4.0(5) ns. In addition, five-quasiparticle states: {\it I}$^{\pi }$ = (39/2$^{-}$) with {\it T}$_{1/2}$ = 1.9(2) ns, and {\it I}$^{\pi }$ = (49/2$^{+}$) with {\it T}$_{1/2}$ = 3.4(4) ns have also been established. The previously determined long-lived decay [{\it T}$_{1/2}$ = 6.6(3) $\mu $s from this work] is associated with isomerism of the {\it I}$^{\pi }$ = (29/2$^{+}$) state. Levels above this long-lived isomer have been identified through a delayed-prompt coincidence measurement. Five-nucleon-hole states with excitation energies {\it E}$_{x}$ $\approx $ 7 MeV have been established as well as possible octupole excitations of the $^{208}$Pb core built on these levels. The level scheme of $^{203}$Tl is extended up to {\it E}$_{x}$ $\approx $ 11 MeV with the inclusion of 25 new transitions. Empirical and shell-model calculations have been performed to aid in the description of the observed states which are found to be predominantly of intrinsic character. Comment: 14 pages, 10 figures |
| Databáze: | arXiv |
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