Title: Nuclear shape and structure in neutron-rich Tc-110,Tc-111
Authors: Luo, Y. X ×
Hamilton, J. H
Rasmussen, J. O
Ramayya, A. V
Stefanescu, Irina
Hwang, J. K
Che, X. L
Zhu, S. J
Gore, P. M
Jones, E. F
Fong, D
Wu, S. C
Lee, I. Y
Ginter, T. N
Ma, W. C
Ter-Akopian, G. M
Daniel, A. V
Stoyer, M. A
Donangelo, R
Gelberg, A #
Issue Date: Aug-2006
Publisher: American physical soc
Series Title: Physical Review C vol:74 issue:2 pages:-
Abstract: The high-spin nuclear structure of Tc isotopes is extended to more neutron-rich regions based on the measurements of prompt gamma rays from the spontaneous fission of Cf-252 at the Gammasphere. The high-spin level scheme of N=67 neutron-rich Tc-110 (Z=43) is established for the first time, and that of Tc-111 is extended and expanded. The ground band of Tc-111 reaches the band-crossing region, and the new observation of the weakly populated alpha=-1/2 member of the band provides important information on signature splitting. The systematics of band crossings in the isotopic and isotonic chains and a CSM calculation suggest that the band crossing of the ground band of Tc-111 is due to alignment of a pair of h(11/2) neutrons. The best fit to signature splitting, branching ratios, and excitations of the ground band of Tc-111 by the rigid triaxial rotor plus particle model calculations result in a shape of epsilon(2)=0.32 and gamma=-26(degrees) for this nucleus. Its triaxiality is larger than that of Tc-107,Tc-109, which indicates increasing triaxiality in Tc isotopes with increasing neutron number. The identification of the weakly populated K+2 satellite band provides strong evidence for the large triaxiality of Tc-111. In Tc-110, the four lowest-lying levels observed are very similar to those in Tc-108. At an excitation of 478.9 keV above the lowest state observed, ten states of a Delta I=1 band are observed. This band of Tc-110 is very analogous to the Delta I=1 bands in Tc-106,Tc-108, but it has greater and reversal signature splitting at higher spins.
ISSN: 0556-2813
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications
× corresponding author
# (joint) last author

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