CAPTURE-GAMMA DETERMINATION OF V$sup 51$ LEVELS
A fast-coincidence scintillation spectrometer was developed for thermal- neutron capture-gamma studies at the Livermore 1-Mw pool-type reactor. The added- neutron binding energy in V/sup 51/ was measured as 11.1 plus or minus 0.1 Mev. Cascade radiations for V/sup 51*/ were observed and a decay scheme was established which verified a previously proposed (p,P ) level scheme. Spin assignments for most of the V/sup 51/(p.P) reported levels below 4.0 Mev are proposed and the level order for the (1f7/2)/sup 3/ proton configuration levels is established as 7/2/sup -/ (ground state), 5/2/sup -/, 3/2/sup -/, 11/2/sup -/, 9/2/sup -/ >s, and 15/2/sup -/ spin with excitation energies of 0.32. 0.93. 1.61. 1.81. and 2.70 Mev. respectively. Of the various nuclear force assumptions that could be made. the short-range force approximation ( sigma -type interaction) and weak surface-coupling effects for V/sup 51*/ configuration states appeared to give the best match between theory and experiment. A previous calculation using experimentally measured splittings of the j/sup 2/ configuration together with tabuiated coefficients of fractional parentage gave excellent agreement with experiment. Evidence was also found for (lf,/sup 7/2/)/ sub o/2p/sub 3/2/- and (1f, /sub 7/2//sup 2/)/sub o/2p/sub 5/2/proton single- particle levels at 2.41 and 2.55 Mev. respectively, as well as for additional low- spin states between 2.70 and 3.38 Mev which possibly represent even states resulting from excitation of a lower shell proton to give a (1f/sub 7/2//sup 4/ )/ sub o/ configuration plus a proton hole in the vacated s hell. Experimental results suggested that the V/sup 51*/ 20--28 core is a more rigid structure than the Ca/sup 43*/ 20--20 core. (auth)
- Research Organization:
- Univ. of California, Livermore
- NSA Number:
- NSA-15-010067
- OSTI ID:
- 4096980
- Report Number(s):
- UCRL-5868; 0031-899X
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 121; ISSN PHRVA
- Country of Publication:
- United States
- Language:
- English
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CALCIUM 43
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