Level structures of

Journal Article · Tue Aug 19 04:00:00 EDT 2003 · Physical Review, C (Nuclear Physics)

OSTI ID:823217

Luo, Y X ^[1]; Wu, S C; Gilat, J; Rasmussen, J O; Hamilton, J H; Ramayya, A V; Hwang, J K; Beyer, C J; Zhu, S J; Kormicki, J; Zhang, X Q; Jones, E F; Gore, P M; Lee, I-Yang; Zielinski, P; Folden, III, C M; Ginter, T N; Fallon, P; Ter-Akopian, G M; Daniel, A V ; Stoyer, M A; Cole, J D; Donangelo, R; Asztalos, S J; Gelberg, A

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1. LBNL Library

Using Gammasphere data on prompt gamma rays from spontaneous fission of 252Cf, we propose energy-level schemes for 110,111,112, & 113Rh (Z=45). The fission-gamma data complement earlier studies of others on beta decay of fission products in that prompt fission gammas mainly populate yrast or near-yrast levels, while beta decay populates lower-spin levels. For the odd-A rhodium nuclei studied here, their ground bands and collective sidebands are compared with model calculations using triaxial-shaped nucleus with one odd quasi-proton. The energies and E2 transition rates are best fit by a shape slightly to the prolate side of maximum triaxiality, namely, gamma = 28 deg. The model calculations also show a K=1/2+ band with energies not in good agreement with a corresponding experimental band. The experimental 1/2+ band is regarded as an intruder band from a prolate-driving proton orbital 1/2[431] above the Z=50 closed shell. This intruder band, seen in other odd-A Rh isotopes, is probably m ore deformed and prolate and would not be expected to be fit at the same triaxial shape parameter as the 7/2+ ground band. We observe a band-crossing (backbending) in the odd-A ground bands above spins of about 21/2. The odd-odd nuclei 110 and 112 Rh show mainly a single band with no backbending up to higher frequency than the backbend in the odd-A isotopes. It is concluded that the backbend is due to alignment of a pair of h11/2 neutrons.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. Nuclear Physics; Vanderbilt U., DE-FG05-88ER40407, Lawrence Berkeley Natl. Lab., DE-AC03-76SF00098, Lawrence Livermore Natl. Lab., W-7405-ENG48, Idaho Natl Engr. and Environ. Lab., DE-AC07-99ID13727, Joint Inst. for Heavy Ion Res., U. of Tenn., Vanderbilt, USDOE through No. DE-FG05-87ER40311; Joint Inst. for Nucl. Res. in Dubna, Russia, DE-AC011-00NN4125, BBW1 Agree. No. 3498 (CRDF Grant RPO-10301-INEEL) and RFBR-DFG grant (RFBR No. p2-02-04004, DFG No. 436RUS 113/673/0-1(R)) Tsinghua U., Beijing, Major State Basic Res. Develop. Prog. No. G2000077400, Chinese Natl. Natural Sci. Found., Grant No. 19775028 (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 823217
• Report Number(s): LBNL--53468
• Journal Information: Physical Review, C (Nuclear Physics), Journal Name: Physical Review, C (Nuclear Physics) Journal Issue: 2 Vol. 6902; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

07 ISOTOPE AND RADIATION SOURCES
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALIGNMENT
BACKBENDING
BETA DECAY
ENERGY LEVELS
FISSION
FISSION PRODUCTS
NEUTRONS
NUCLEI
ODD-ODD NUCLEI
PROTONS
RHODIUM
RHODIUM SPONTANEOUS FISSION GAMMASPHERE TRIAXIALITY CALIFORNIUM
SHAPE
SPONTANEOUS FISSION