Excitation energy of the πs1/2intruder state inBi<

Abstract

In a series of " Ti bombardments of ' "Sm the decay energy of the '" Bi'" (7rs «2) ct transition that proceeds to the (ms, o) ground state of ' Tl was measured to be 7.30(4) MeV. This result establishes the excitation energy of ' Bi"' as 190(40) keV rather than the adopted 92(10)-keV value. Our data indicate a leveling off in excitation energy at N= 106 for the s»z intruder state in the odd-A Bi isotopes rather than a continued drop at that neutron number as inferred by Coenen et al. in their discussion of intruder state systematics in the Pb region. Consequences of this discrepancy for the adopted excitation energy of the~s i/2 isomer in ' Bi are discussed.PACS number(s): 21.10.Pc, 23.60.+e, 27.70.+q

Behavior of intruder based states in light Bi and Tl isotopes: The study of [sup 187]Bi α decay

“…242 keV] ( 5 ) to N= 106 [189Bi; 190(40) keV] (6). Indeed this trend seemed to continue in 187Bi as reported in Ref (7), although this was based on data with very poor statistics (8).…”

Progress report on nuclear spectroscopic studies

“…Wheel speeds up to 500 rpm were used to study the decay of lS9Bi whereas speeds of 1000 and 1500 rpm were used to observe the shorter-lived lg0P0. Details of our results for 18'Bi Q decay can be seen in the already published short report [83]. Briefly, the decay energy of the 18'Bi" ( T S * /~) a transition that proceeds to the (m1/2) ground state of lS5Tl was measured to be 7.30(4) MeV.…”