Multipole mixtures in gamma transitions in the (n, n′γ) reaction on 160Gd

Lifetime measurements of low-spin negative-parity levels in Gd160

“…Since the last evaluation of 160 Gd [34], three papers have made additions to the 160 Gd level structure using the (n, n γ) reaction [26,31,35]. This information has been considered along with the current results and is presented in Table I.…”

“…Gamma rays from a level were only included if the excitation functions were consistent in shape and threshold for all γ rays. There were also previously placed γ rays that were below our experimental observation threshold and these were not included in the level scheme [31].…”

“…In Table I, transition probabilities were calculated using the literature lifetime and the associated branching ratios from Ref. [31] to calculate the B(E2) values presented, after ensuring the consistency of the reported branching ratios with our data.…”

“…The experimental values of these parameters were then compared to statistical model calculations from the code cindy [30] to determine multipole mixing ratios (δ) of the transitions. If the intensity of the γ ray was small or if the statistical uncertainty was large, the a 2 and a 4 values were compared with those in Govor, et al [31]. Provided the values matched within uncertainties, the values of Ref.…”

“…Provided the values matched within uncertainties, the values of Ref. [31] were used in relevant calculations and noted. The angular distribution measurements were also used to extract lifetimes of excited states shorter than about 1 ps by the Doppler-shift attenuation method (dsam) [32].…”