A study of the energy levels of 75Se

Shape coexistence and high-Kstates in74Se populated following theβdecay ofMcCutchan1, Lister2, Ahn3 et al. 2013Phys. Rev. C10071View full textAdd to dashboardCite

“…Branching ratios from excited levels are compared with the current literature [22] values. Levels which were observed in a previous study [19] of the decay of the J π =(0 − ) ground state but not in the decay from the J π =4 (+) isomer [20,21] are indicated by a *. Figure 2 gives a partial level scheme of 74 Se for states below 2600 keV.…”

“…By comparing the feeding and γ intensities obtained in this work with the results given in Refs. [19][20][21], it was determined that the majority of the decays observed in the present experiment originated from the 4 (+) isomer. The fraction of the produced 74 Br in the (0 − ) ground state was found to be 7(3)%.…”

“…for the 0 Ref. [20] reported |δ|> 50, also from γγ(θ) measurements. The evaluated data [22] reports a value of δ=-5.6(16) based on the A 2 and A 4 values given in Ref.…”

“…[19] and Refs. [20,21], respectively. Since the two β-decaying states are of sufficiently different J π values, a number of levels are fed only from either the ground state or the isomer.…”

B(GT)strength fromβ-decay measurements and inferred shape mixing inKrPoirier1, Maréchal2, Dessagne3 et al. 2004Phys. Rev. C672380View full textAdd to dashboardCite

“…Moreover, the strength at high excitation energy in 74 Br is not seen due to the 1022 keV energy fraction always missed in ␤ + decay and to the relatively high ␤ detection threshold ͑E cut ϳ 300 keV͒ cutting off the contribution of low energy ␤ particles. In addition, the existence of a 4 ͑−͒ isomeric state in 74 Br with a 41.5 min half-life [30] and an excitation energy of 13.8 keV [31], complicates any subtraction of the daughter activity as the collection-measurement cycles used in the krypton and bromine measurements are different. Therefore, we have limited our analysis to the EC component of the decay by requiring coincidences between the TAgS spectrometer and the x-ray detector.…”