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Title: Nuclear shape and structure in neutron-rich 110,111Tc

Abstract

The structure of Tc nuclei is extended to the moreneutron-rich regions based on measurements of prompt gamma rays from thespontaneous fission of 252Cf at Gammasphere. The level scheme of N=67neutron-rich (Z=43) 110Tc is established for the first time and that of111Tc is expanded. The ground-state band of 111Tc reaches theband-crossing region and the new observation of the weakly populatedalpha = -1/2 member of the band provides important information ofsignature splitting. The systematics of band crossings in the isotopicand isotonic chains and a CSM calculation suggest that the band crossingof the gs band of 111Tc is due to alignment of a pair of h11/2 neutrons.The best fit to signature splitting, branching ratios, and excitations ofthe ground-state band of 111Tc by RTRP model calculations result in ashape of epsilon2 = 0.32 and gamma = -26 deg. for this nucleus. Itstriaxiality is larger than that of 107Tc, to indicate increasingtriaxiality with increasing neutron number. The identification of theweakly-populated "K+2 satellite" band provides strong evidence for thelarge triaxiality of 111Tc. In 110Tc the four lowest-lying levelsobserved are very similar to those in 108Tc. At an excitation of 478.9keV above the lowest state observed, ten states of a delta I = 1 band areobserved. Thismore » band is very analogous to the delta I = 1 bands in106,108Tc, but it has greater signature splitting at higherspins.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USDOE Director. Office of Science. Office of AdvancedScientific Computing Research. Office of Nuclear Physics,DE-FG05-88ER40407, DE-AC02-05CH11231, DE-AC-99ID13727, W-7405-ENG48; Major State Basic Research Development Program G2000077400; ChineseNational Natural Science Foundation 10375032
OSTI Identifier:
901674
Report Number(s):
LBNL-59476
R&D Project: NOXRAS; BnR: KB0401024; TRN: US0702655
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review C; Journal Volume: 74; Related Information: Journal Publication Date: 2006
Country of Publication:
United States
Language:
English
Subject:
73; 71; ALIGNMENT; BRANCHING RATIO; CHAINS; ENERGY LEVELS; EXCITATION; NEUTRONS; NUCLEI; SHAPE; SPONTANEOUS FISSION; Fission Gamma Spectroscopy Triaxial Rotational Bands

Citation Formats

Luo, Y.X., Hamilton, J.H., Rasmussen, J.O., Ramayya, A.V., Stefanescu, I., Hwang, J.K., Zhu, S.J., Gore, P.M., Jones, E.F., Fong,D., Wu, S.C., Lee, I.Y., Ginter, T.N., Ter-Akopian, G.M., Daniel, A.V., Stoyer, M.A., Donangelo, R., and Gelberg, A.. Nuclear shape and structure in neutron-rich 110,111Tc. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.74.024308.
Luo, Y.X., Hamilton, J.H., Rasmussen, J.O., Ramayya, A.V., Stefanescu, I., Hwang, J.K., Zhu, S.J., Gore, P.M., Jones, E.F., Fong,D., Wu, S.C., Lee, I.Y., Ginter, T.N., Ter-Akopian, G.M., Daniel, A.V., Stoyer, M.A., Donangelo, R., & Gelberg, A.. Nuclear shape and structure in neutron-rich 110,111Tc. United States. doi:10.1103/PhysRevC.74.024308.
Luo, Y.X., Hamilton, J.H., Rasmussen, J.O., Ramayya, A.V., Stefanescu, I., Hwang, J.K., Zhu, S.J., Gore, P.M., Jones, E.F., Fong,D., Wu, S.C., Lee, I.Y., Ginter, T.N., Ter-Akopian, G.M., Daniel, A.V., Stoyer, M.A., Donangelo, R., and Gelberg, A.. Thu . "Nuclear shape and structure in neutron-rich 110,111Tc". United States. doi:10.1103/PhysRevC.74.024308. https://www.osti.gov/servlets/purl/901674.
@article{osti_901674,
title = {Nuclear shape and structure in neutron-rich 110,111Tc},
author = {Luo, Y.X. and Hamilton, J.H. and Rasmussen, J.O. and Ramayya, A.V. and Stefanescu, I. and Hwang, J.K. and Zhu, S.J. and Gore, P.M. and Jones, E.F. and Fong,D. and Wu, S.C. and Lee, I.Y. and Ginter, T.N. and Ter-Akopian, G.M. and Daniel, A.V. and Stoyer, M.A. and Donangelo, R. and Gelberg, A.},
abstractNote = {The structure of Tc nuclei is extended to the moreneutron-rich regions based on measurements of prompt gamma rays from thespontaneous fission of 252Cf at Gammasphere. The level scheme of N=67neutron-rich (Z=43) 110Tc is established for the first time and that of111Tc is expanded. The ground-state band of 111Tc reaches theband-crossing region and the new observation of the weakly populatedalpha = -1/2 member of the band provides important information ofsignature splitting. The systematics of band crossings in the isotopicand isotonic chains and a CSM calculation suggest that the band crossingof the gs band of 111Tc is due to alignment of a pair of h11/2 neutrons.The best fit to signature splitting, branching ratios, and excitations ofthe ground-state band of 111Tc by RTRP model calculations result in ashape of epsilon2 = 0.32 and gamma = -26 deg. for this nucleus. Itstriaxiality is larger than that of 107Tc, to indicate increasingtriaxiality with increasing neutron number. The identification of theweakly-populated "K+2 satellite" band provides strong evidence for thelarge triaxiality of 111Tc. In 110Tc the four lowest-lying levelsobserved are very similar to those in 108Tc. At an excitation of 478.9keV above the lowest state observed, ten states of a delta I = 1 band areobserved. This band is very analogous to the delta I = 1 bands in106,108Tc, but it has greater signature splitting at higherspins.},
doi = {10.1103/PhysRevC.74.024308},
journal = {Physical Review C},
number = ,
volume = 74,
place = {United States},
year = {Thu Feb 02 00:00:00 EST 2006},
month = {Thu Feb 02 00:00:00 EST 2006}
}