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Report No.

New $$beta$$-decaying state in $$^{214}$$Bi

Andel, B.*; Van Duppen, P.*; Andreyev, A. N.; Blazhev, A.*; Grawe, H.*; Lica, R.*; Na$"i$dja, H.*; Stryjczyk, M.*; 52 of others*

A new $$beta$$-decaying state in $$^{214}$$Bi has been identified at the ISOLDE Decay Station at the CERN-ISOLDE facility. A preferred $$I^{pi} = (8^{-})$$ assignment was suggested for this state based on the $$beta$$-decay feeding pattern to levels in $$^{214}$$Po and shell-model calculations. The half-life of the $$I^{pi} = (8^{-})$$ state was deduced to be $$T_{1/2} = 9.39 (10)$$ min. The deexcitation of the levels populated in $$^{214}$$Po by the $$beta$$ decay of this state was investigated via $$gamma-gamma$$ coincidences and a number of new levels and transitions were identified. Shell-model calculations for excited states in $$^{214}$$Bi and $$^{214}$$Po were performed using two different effective interactions: the H208 and the modified Kuo-Herling particle interaction. Both calculations agree on the interpretation of the new $$beta$$-decaying state as an $$I^{pi} = 8^{-}$$ isomer and allow for the tentative assignment of shell-model states to several high-spin states in $$^{214}$$Po.



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Category:Physics, Nuclear



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