-decay study of
Tl
Tlの
崩壊
Van Beveren, C.*; Andreyev, A. N.; Barzakh, A. E.*; Cocolios, T. E.*; de Groote, R. P.*; Fedorov, D.*; Fedosseev, V. N.*; Ferrer, R.*; Ghys, L.*; Huyse, M.*; K
ster, U.*; Lane, J.*; Liberati, V.*; Lynch, K. M.*; Marsh, B. A.*; Molkanov, P. L.*; Procter, T. J.*; Rapisarda, E.*; Sandhu, K.*; Seliverstov, M. D.*; Van Duppen, P.*; Venhart, M.*; Veselsk
, M.*
Van Beveren, C.*; Andreyev, A. N.; Barzakh, A. E.*; Cocolios, T. E.*; de Groote, R. P.*; Fedorov, D.*; Fedosseev, V. N.*; Ferrer, R.*; Ghys, L.*; Huyse, M.*; K
ster, U.*; Lane, J.*; Liberati, V.*; Lynch, K. M.*; Marsh, B. A.*; Molkanov, P. L.*; Procter, T. J.*; Rapisarda, E.*; Sandhu, K.*; Seliverstov, M. D.*; Van Duppen, P.*; Venhart, M.*; Veselsk
, M.*
-decay spectroscopy of
Tl has been performed at the CERN isotope separator on-line (ISOLDE) facility. New fine-structure
decays have been observed for both isotopes.
-decay branching ratios of 0.089(19)
, 0.047(6)
and 1.22(30)
have been deduced for the (10
), (7
) and (2
) states respectively in
Tl and a lower limit of 0.49
for the
-decay branching ratio of
Tl. A new half-life of 9.5(2) s for the (2
) state in
Tl and 1.9(1) s for the low-spin state in
Tl has been deduced. Using
-
coincidence analysis, multiple
rays were observed de-exciting levels in
Au fed by
Tl
decays. The
transitions connecting these low-lying states in
Au are essential to sort the data and possibly identify bands from inbeam studies in these isotopes. Owing to the complex fine-structure
decays and limited knowledge about the structure of the daughter nuclei, only partial level schemes could be constructed for both gold isotopes in the present work. Reduced
-decay widths have been calculated and are compared with values obtained in neighboring odd-A and even-A thallium isotopes. Except for the allowed
decay of the
Tl (10
) state, the other fine-structure
decays observed in this study are hindered. This points to strong structural changes between parent thallium and daughter gold isotopes.