Production and decay properties of the 1.9-s isomeric state in {sup 261}Rf

Journal Article · Tue Mar 15 04:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.034602· OSTI ID:21499496

Haba, H; Kaji, D; Kikunaga, H; Kudou, Y; Morimoto, K; Morita, K; Ozeki, K; Sumita, T; Yoneda, A; Kasamatsu, Y; Komori, Y; Ooe, K; Shinohara, A ^[1]

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1. Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198 (Japan)

The 1.9-s isomeric state ({sup 261}Rf{sup b}) in {sup 261}Rf was directly populated in the {sup 248}Cm({sup 18}O,5n){sup 261}Rf{sup b} reaction. Alpha and spontaneous fission (SF) decays of {sup 261}Rf{sup b}, as well as the 68-s state {sup 261}Rf{sup a}, was investigated with a rotating wheel apparatus under low background conditions attained by a gas-jet transport system coupled to the RIKEN gas-filled recoil ion separator. An identification of {sup 261}Rf{sup b} was based on {alpha}-{alpha} correlations linking {alpha} decays of {sup 261}Rf{sup b} and its daughter {sup 257}No. The {alpha}-particle energy of {sup 261}Rf{sup b} was measured to be 8.52 {+-} 0.05 MeV. The half-life was determined to be 1.9 {+-} 0.4 s based on both 8.52-MeV {alpha} and SF decays. The {alpha} and SF branches are 0.27 {+-} 0.06 and 0.73 {+-} 0.06, respectively. The cross section for the {sup 248}Cm({sup 18}O,5n){sup 261}Rf{sup b} reaction is {sigma}({sup 261}Rf{sup b}) = 11 {+-} 2 nb at 95.1 MeV, which gives a cross-section ratio of {sigma}({sup 261}Rf{sup a})/{sigma}({sup 261}Rf{sup b}) = 1.1 {+-} 0.2.

• OSTI ID: 21499496
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 83; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE NUCLEI
ALPHA DECAY
ALPHA DECAY RADIOISOTOPES
ALPHA PARTICLES
CHARGED PARTICLES
CORRELATIONS
CROSS SECTIONS
CURIUM 248 TARGET
DECAY
EMISSION
ENERGY RANGE
EVEN-ODD NUCLEI
FISSION
HALF-LIFE
HEAVY ION REACTIONS
HEAVY NUCLEI
IONIZING RADIATIONS
IONS
ISOMERS
ISOTOPES
MEV RANGE
MINUTES LIVING RADIOISOTOPES
NEUTRON EMISSION
NOBELIUM 257
NOBELIUM ISOTOPES
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
OXYGEN 18 REACTIONS
RADIATIONS
RADIOISOTOPES
RECOILS
RUTHERFORDIUM 261
RUTHERFORDIUM ISOTOPES
SECONDS LIVING RADIOISOTOPES
SPONTANEOUS FISSION
SPONTANEOUS FISSION RADIOISOTOPES
TARGETS