First candidates for {\gamma} vibrational bands built on the [505]11/2- neutron orbital in odd-A Dy isotopes

Majola S. N. T., Sithole M. A., Mdletshe L.,Hartley D.,Timar J.,Nyako B. M.,Allmond J. M.,Bark R. A.,Beausang C.,Bianco L.,Bucher T. D.,Bvumbi S. P.,Carpenter M. P.,Chiara C. J.,Cooper N.,Cullen D. M.,Curien D.,Dinoko T. S.,Gall B. J. P.,Garrett P. E.,Greenlees P. T., Hirvonen J., Jakobsson U.,Jones P. M.,Julin R., Juutinen S., Ketelhut S.,Kheswa B. V.,Kondev F. G.,Korichi A., Kulp W. D.,Lauritsen T.,Lawrie E. A.,Makhathini L.,Masiteng P. L., Maqabuka B.,Mccutchan E. A.,Miller D.,Miller S., Minkova A., Msebi L., Mthembu S. H.,Ndayishimye J.,Nieminen P., Ngcobo P. Z.,Ntshangase S. S.,Orce J. N., Peura P.,Rahkila P., Redon N.,Riedinger L. L., Riley M. A., Roux D. G.,Ruotsalainen P., Piot J., Saren J.,Sharpey-Schafer J. F., Scholey C.,Shirinda O.,Simpson J.,Sorri J., Stefanescu I., Stolze S.,Uusitalo J.,Wang X.,Werner V., Wood J. L.,Yu C. H.,Zhu S.,Zimba G.

PHYSICAL REVIEW C（2020）

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摘要

Rotational structures have been measured using the Jurogam II and GAMMASPHERE arrays at low spin following the Gd-155(alpha, 2n) Dy-157 and Nd-148(C-12, 5n) Dy-155 reactions at 25 and 65 MeV, respectively. We report high-K bands, which are conjectured to be the first candidates of a K-pi = 2(+)gamma vibrational band, built on the [505]11/2(-) neutron orbital, in both odd-A Dy-155,Dy-157 isotopes. The coupling of the first excited K = 0(+) states or the so-called beta vibrational bands at 661 and 676 keV in Dy-154 and Dy-156 to the [505]11/2(-) orbital, to produce a K-pi = 11/2(-) band, was not observed in both Dy-155 and Dy-157, respectively. The implication of these findings on the interpretation of the first excited 0(+) states in the core nuclei Dy-154 and Dy-156 are also discussed.

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