Speaker
Mr
SIYABONGA MAJOLA
(ITHEMBA LABS/UNIZULU)
Description
Vibrational levels are well known in atomic nuclei but despite many decades of research,
some of their properties still remain elusive. In particular, low-lying rotational bands based on the first excited 0+ state, which are traditionally understood as β vibrational bands nevertheless show properties at odds with this interpretation, more especially in the
transitional rare earth region with N~90 [Gar01]. An alternative is that they can be better be described as a “second vacuum”, or coexisting minimum in the pairing degree of freedom
[Sch11a]. In order to produce a complete and definitive microscopic picture of the so-called β and γ bands, an extensive systematic review is performed for nuclides in the 160 mass region, between N = 88 and 92 and Sm to Yb. The data are explained using a five dimensional
collective Hamiltonian for quadrupole rotational and vibrational degrees of freedom [Li09,
Nik09]. A good qualitative agreement is obtained between measured energies and
electromagnetic transition rates across the entire A ~ 160 mass region. The implication of
these findings on the interpretation the first excited 0+ states is there from discussed.
[Gar01] P. E. Garrett, J. Phys. G27, R1 (2001)
[Li09] Z.P. Li et al., Phys. Rev. C 79, 054301 (2009)
[Nik09] T. Nikšić., Phys. Rev. C 79, 034303 (2009)
[Sch11a] J.F. Sharpey-Schafer et al. Eur. Phys. J. A47 (2011) 6
Primary author
Mr
SIYABONGA MAJOLA
(ITHEMBA LABS/UNIZULU)
Co-authors
Mr
George Zimba
(University of Johannesburg)
Prof.
John F Sharpey-Schafer
(University of Western Cape)
Mr
Maciej Stankiewicz
(UCT)
Dr
Robert Bark
(iThemba LABS)
Ms
SUZAN PHUMUDZO BVUMBI
(UNIVERSITY OF JOHANNESBURG)
Mr
Shi Zhi
(Peiking University)
Dr
Shuangquan Zhang
(School of Physics, Peking University, Beijing)
Dr
Sifiso Senzo Ntshangase
(University of Zululand)
Mr
Tshepo Dinoko
(University of the Western Cape/ iThemba LABS)
Prof.
Zhipan Li
(South West Univesity)
