Signature inversion in odd-odd {sup 114}Rh: First identification of high-spin states in very neutron-rich {sup 114}Rh and application of the triaxial projected shell model

Journal Article · Wed Jun 15 00:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.064310· OSTI ID:21502770

Liu, S H ^[1]; Hamilton, J H; Ramayya, A V; Brewer, N T; Hwang, J K ^[1]; Chen, Y S; Gao, Z C ^[2]; Zhu, S J; Gu, L; Yeoh, E Y ^[3]; Luo, Y X ^[1]; Rasmussen, J O ^[4]; Ma, W C ^[5]; Batchelder, J C ^[6]; Daniel, A V ^[1]; Ter-Akopian, G M; Oganessian, Yu Ts ^[7]; Gelberg, A ^[8]

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1. Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States)
2. China Institute of Atomic Energy, P.O. Box 275(18), Beijing 102413 (China)
3. Department of Physics, Tsinghua University, Beijing 100084 (China)
4. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
5. Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762 (United States)
6. UNIRIB/Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831 (United States)
7. Joint Institute for Nuclear Research, RU-141980 Dubna (Russian Federation)
8. Institut fuer Kernphysik, Universitaet zu Koeln, DE-50937 Cologne (Germany)

High-spin excited states in the very neutron-rich nucleus {sup 114}Rh have been studied by examining the prompt {gamma} rays emitted in the spontaneous fission of {sup 252}Cf with the Gammasphere detector array. A high-spin level scheme of {sup 114}Rh has been established for the first time with 13 new levels. The level scheme is proposed to be built on a 7{sup -} state. The existence of a relatively large signature splitting and an yrare band show features which may indicate triaxial deformation. The phenomenon of signature inversion has been observed in {sup 114}Rh at I=12 ({h_bar}/2{pi}). The observed signature inversion of {sup 114}Rh is interpreted successfully in terms of the triaxial projected shell model. Theoretical calculations suggest that the negative-parity, yrast band of {sup 114}Rh has the two-quasi-particle configuration of {pi}g{sub 9/2} x {nu}h{sub 11/2}, consistent with the systematics of odd-odd Rh isotopes. The signature inversion at spin 12 ({h_bar}/2{pi}) may be attributed to the change of rotational mode, from quasi-particle aligned rotation at low spins to collective rotation at high spins.

• OSTI ID: 21502770
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 83, Issue 6; Other Information: DOI: 10.1103/PhysRevC.83.064310; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CALIFORNIUM 252
CONFIGURATION
DEFORMATION
EXCITED STATES
GAMMA DETECTION
GAMMA RADIATION
HIGH SPIN STATES
NEUTRON-RICH ISOTOPES
NEUTRONS
ODD-ODD NUCLEI
QUASI PARTICLES
RHODIUM 114
ROTATION
SHELL MODELS
SPIN
SPONTANEOUS FISSION
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALIFORNIUM ISOTOPES
DECAY
DETECTION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
EVEN-EVEN NUCLEI
FERMIONS
FISSION
HADRONS
HEAVY NUCLEI
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
MATHEMATICAL MODELS
MOTION
NUCLEAR DECAY
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PARTICLE PROPERTIES
RADIATION DETECTION
RADIATIONS
RADIOISOTOPES
RHODIUM ISOTOPES
SECONDS LIVING RADIOISOTOPES
SPONTANEOUS FISSION RADIOISOTOPES
YEARS LIVING RADIOISOTOPES