Metastable states from multinucleon excitations in 202Tl and 203Pb

• Published in: Physical review. C 2020-08, Vol.102 (2)
• Main Authors: Wahid, S. G., Tandel, S. K., Suman, Saket, Hemalatha, M., Patel, Anurag, Roy, Poulomi, Deo, A. Y., Pragati, None, Srivastava, P. C., Bhoy, Bharti, Bhattacharjee, S. S., Singh, R. P., Muralithar, S., Chowdhury, P., Janssens, R. V. F., Carpenter, M. P., Khoo, T. L., Kondev, F. G., Lauritsen, T., Lister, C. J., Seweryniak, D., Zhu, S., Rai, S., Sharma, A.
• Format: Article
• Language: English
• Subjects: Electromagnetic transitions; Isomer decays; Lifetimes & widths; NUCLEAR PHYSICS AND RADIATION PHYSICS; Nuclear structure & decays; Shell model
• ISSN: 2469-9985; 2469-9993

The excited level structures of 202Tl and 203Pb, above the 7+ and 29/2– isomers, respectively, have been studied. An isomer with Iπ = 20+ and T1/2 = 215(10) μs has been established in 202Tl, and the level scheme extended from I = 10 to 20ℏ with the placement of fifteen new transitions. In 203Pb, the Iπ = 37/2+ state is established to be metastable, with T1/2 = 2.5(3) ns. Levels in both nuclei arise from intrinsic excitations, with likely particle-hole character for the higher-lying states in 203Pb. The 20+ isomer in 202Tl is most likely associated with a $πh$ $^{–1}_{11/2}$ Ⓧ ν($i$ $^{–2}_{13/2}$, $f$ $^{–1}_{5/2}$) configuration, while the 37/2+ state in 203Pb results from the excitation of five neutrons. Furthermore, calculations, using both an empirical approach and the oxbash code, have been performed to aid in the description of the excited level structure.