Levels in160Yb from the radioactive decay of160Lu

Abstract

The y-rays following the radioactive decay of 16~ into 16~ have been studied. The Lu source was produced in the 144Sm(19F, 3n) reaction at 85 MeV. Excitation functions, half-lives, 7-Y and y-X-ray coincidences and conversion electrons were measured. Two /3 + decaying states in 16~were found with half-lives of 36.2(3)s and 40(1)s. 16~ levels deduced from the decay of 16~ are presented.

Spectroscopy of a tetrahedral doubly magic candidate nucleus ${}_{70}^{160}{\mathrm{Yb}}_{90}$

“…4 The transitions marked with red and blue arrows in the level scheme are the ones that were proposed by other authors, viz. [4,5] and [10], respectively, but could not be confirmed in the present work. The position of these transitions in the gated spectrum are shown with red arrows and red text.…”

“…The comparisons of the deduced ratios with those from the ENSDF database [42] are also shown (for the details see text). in the heavy ion experiments [4,5], whereas those marked in blue were also reported in 160 Lu decay experiment [10].…”

“…The structure of Band-6 has been illustrated in figure 15. The 1358 keV 3 − level of Band-5, reported in [4], was observed in the decay of 160 Lu [10] but in no other heavy ion data [42]. In the present work, the existence of this level could not be confirmed either, possibly because of lack of direct feeding from the reaction at low spin.…”

“…The odd-spin negative-parity Band 7 is built on the 1256 keV and development of the band has been shown in figure 16. The spin-parity I π = 3 − identification of the 1256 keV level was adopted in [42] after the experimental work on the decay of 160 Lu [10]. In the present work also we have measured for the first time the E1 character of the 616.9 keV line by gamma-ray spectroscopic techniques confirming the I π = 3 − assignment of ENSDF.…”

β and γ bands in N=88 , 90, and 92 isotones investigated with a five-dimensional collective Hamiltonian based on covariant density functional theory: Vibrations, shape coexistence, and superdeforma

“…In particular, those for the 577-and 870-keV transitions are consistent with the pure E 2 assignment favoured in the angular correlation analysis of Garrett et al [51]. However, the level at 1256 keV in the 2 γ + band was assigned spin and parity of I π = 3 − by Auer et al [52], based on measured conversion coefficients for the 617 and 435 keV transitions. This assignment is rejected here because our DCO ratio for the 435-keV transition, 1.02(9) is consistent with a stretched E 2 transition, and if a I π = 3 − assignment was adopted, M2 multipolarity would be required for the 318-and 366-keV transitions linking the signature partners of the 2 γ + band.…”