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Sö,derströ,m, P.-A.,Walker, P.M.,Wu, J.,Liu, H.L.,Regan, P.H.,Watanabe, H.,Doornenbal, P.,Korkulu, Z.,Lee, P.,Liu, J.J.,Lorusso, G.,Nishimura, S.,Phong, V.H.,Sumikama, T.,Xu, F.R.,Yagi, A.,Zha North-Holland Pub. Co 2016 Physics letters. Section B Vol.762 No.-
<P><B>Abstract</B></P> <P>A detailed study of the structure of the doubly mid-shell nucleus Dy 104 1 66 170 has been carried out, following isomeric and <I>β</I> decay. We have measured the yrast band up to the spin-parity <SUP> J π </SUP> = <SUP> 6 + </SUP> state, the K = 2 <I>γ</I>-vibration band up to the <SUP> 5 + </SUP> state, a low-lying negative-parity band based on a <SUP> 2 − </SUP> state that could be a candidate for the lowest energy octupole vibration state within this nucleus, and a candidate for the <SUP> K π </SUP> = <SUP> 6 + </SUP> two quasi-particle isomer. This state was determined to have an excitation energy of 1643.91(23) keV and a half life of 0.99(4) μs, with a reduced hindrance for its decay to the ground-state band an order of magnitude lower than predicted by <SUB> N p </SUB> <SUB> N n </SUB> systematics. This is interpreted as being due to <I>γ</I>-vibrational mixing from a near degeneracy of the isomer and the <SUP> 6 + </SUP> state of the <I>γ</I> band. Furthermore, the parent nucleus <SUP>170</SUP>Tb has been determined to have a half-life of 0.91 ( − 13 + 18 ) s with a possible spin-parity of <SUP> 2 − </SUP> .</P>
Watanabe, H.,Zhang, G.X.,Yoshida, K.,Walker, P.M.,Liu, J.J.,Wu, J.,Regan, P.H.,Soderstrom, P.A.,Kanaoka, H.,Korkulu, Z.,Lee, P.S.,Nishimura, S.,Yagi, A.,Ahn, D.S.,Alharbi, T.,Baba, H.,Browne, F.,Bruce North-Holland Pub. Co 2016 Physics letters. Section B Vol.760 No.-
The level structure of <SUP>172</SUP>Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a <SUP>238</SUP>U beam. A long-lived isomeric state with T<SUB>½</SUB>=0.71(5) s and K<SUP>π</SUP>=8<SUP>-</SUP> has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus <SUP>172</SUP>Ho via allowed β decays. The robust nature of the K<SUP>π</SUP>=8<SUP>-</SUP> isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.