Experimental Identification of Spin-Parities and Single-Particle Configurations in {sup 257}No and Its {alpha}-Decay Daughter {sup 253}Fm

Journal Article · Fri Sep 02 04:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.102502· OSTI ID:20699391

Asai, M; Tsukada, K; Ichikawa, S; Nagame, Y; Nishinaka, I; Akiyama, K ^[1]; Sakama, M ^[2]; Ishii, T; Osa, A ^[3]; Oura, Y ^[4]; Sueki, K ^[5]; Shibata, M ^[6]

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1. Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195 (Japan)
2. Department of Radiologic Science and Engineering, The University of Tokushima, Tokushima 770-8509 (Japan)
3. Department of Materials Science, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195 (Japan)
4. Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397 (Japan)
5. Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki 305-8571 (Japan)
6. Radioisotope Research Center, Nagoya University, Nagoya 464-8602 (Japan)

{alpha}-{gamma} and {alpha}-electron coincidence spectroscopy for a short-lived heavy actinide nucleus {sup 257}No (T{sub 1/2}=24.5 s) has been performed using a gas-jet transport system and an on-line isotope separator. Spin-parities of excited states in {sup 253}Fm fed by the {alpha} decay of {sup 257}No have been identified on the basis of the measured internal conversion coefficients. The {nu}3/2{sup +}[622] configuration has been assigned to the ground state of {sup 257}No as well as to the 124.1 keV level in {sup 253}Fm. It was found that the ground-state configuration of {sup 257}No is different from that of lighter N=155 isotones.

• OSTI ID: 20699391
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY
ALPHA SPECTROSCOPY
DAUGHTER PRODUCTS
ELECTRON SPECTROSCOPY
EXCITED STATES
FERMIUM 253
GAMMA SPECTROSCOPY
GROUND STATES
INTERNAL CONVERSION
ISOTONIC NUCLEI
ISOTOPE SEPARATORS
KEV RANGE 100-1000
NOBELIUM 257
PARITY
SPIN