In-beam gamma-ray and electron spectroscopy following the75As(p, n)75Se reaction

High spin states in75Se populated by the72Ge(?,n) and73Ge(?, 2n) reaction

“…This assignment is supported by the ft-value from the radioactive decay of 7SBr, an l=4 transfer (the most probable) and a small spectroscopic factor in the (d, t)-reaction, and the M1 +E2 character of the ll2keV transition to the ground state established in the (p, nT)-reaction [6]. The angular distribution of the ll2keV transition which we measured in the (~, n)-reaction has a negative A2-coefficient which is consistent with a 7/2 +--.5/2 + MI+E2 (negative quadrupole admixture 6) transition.…”

“…Sanderson [14] established l=4 and found a large spectroscopic factor which supports a 9/2 + assignment. Agarwal et al [6] found in the (p, n)-reaction a lifetime of 5.3 +0.6 ns for this state. The branched decay goes at 55 ~o by the 132 keV transition to the ground state and at 45"/o by the 21 keV transition to the 112 keV level.…”

“…The 287 keV and the 292 keV levels form a doublet which was identified by Agarwal et al [6] by establishing a 6.5 keV and 287 keV cascade. The absence of any decay of the 293 keV level to the 5/2 +, 7/2 +, and 9/2 + states induced us to assign a spin of 1/2-to this state like Agarwal et al did 6-1245.5 keV.…”

“…The (c~,xnT)-reaction is very well apted for this purpose. 75Se was previously reached by the reactions 75As(p,n),) [6,12,13], 7~ t) [14], and by the /~-decay of 75Br [15]. In this paper we report an improved level scheme of VSSe which was established by using the 72Ge(~, n)-and the 73Ge(e ' 2 n)-reactions.…”

“…Protop et al [5] found in 75Se a 5/2-band, which has the characteristics of a rotational band in a strongly deformed prolate field. Agarwal et al, [6] found a cascade with two transitions on a 1/2-level, which they interpreted as a rotational band. Similar 1/2-bands are observed in neighbouring nuclei such as 7VSe [7,28,29] and 79Kr [8].…”