Gamma-ray studies in /sup 45/V

Journal Article · Tue Apr 01 04:00:00 EST 1980 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.21.1290· OSTI ID:5360307

Gronemeyer, S A; Meyer-Schuetzmeister, L; Elwyn, A J; Hardie, G

The level scheme of /sup 45/V was studied with the reaction /sup 40/Ca(/sup 7/Li,2n)/sup 45/V using /sup 7/Li beams of 14 --16-MeV energies. Prompt and delayed n-..gamma.. and ..gamma..-..gamma.. coincidences revealed a doublet at an excitation energy of about 57 keV with a separation energy of only 800 eV. The half-life of the upper member, a 3/2/sup -/ state, was measured to be 430 +- 80 nsec. This state decays strongly via internal conversion to the lower member of the doublet, a 5/2/sup -/ state. The half-life of the latter level was measured to be < or approx. = 4.2 nsec. Since /sup 45/V is a T=1/2 nucleus and the mirror of the well-known /sup 45/Ti nucleus, Coulomb displacement energies could be deduced. A comparison of these Coulomb displacement energies with those of neighboring nuclei, the measured lifetimes, and the observed ..gamma..-..gamma.. and n-..gamma.. prompt and delayed coincidence spectra established nearly all the /sup 45/V levels expected below the proton separation energy of 1.62 MeV, namely, 7/2/sup -/(g.s.), 5/2/sup -/(56.4 keV), 3/2/sup -/(57.2 keV), 3/2/sup +/(386.1 keV), 5/2/sup +/(796.8 keV), and 7/2/sup +/(1273 keV). The expected four highest bound levels, in particular the 9/2/sup -/ and 11/2/sup -/ states, are not seen in the present experiment. The latter two states are supposed to decay either completely or predominantly to the ground state and hence are not observable in these ..gamma..-..gamma.. coincidence studies. The third and fourth levels were not seen in /sup 45/Ti ..gamma..-ray spectra which exhibit much higher counting rates than those of /sup 45/V. They are therefore not expected to be observable in the present /sup 45/V spectra. /sup 45/V gamma rays were also seen in the /sup 40/Ca(/sup 6/Li,n)/sup 45/V reaction with a10- and a 13.5-MeV /sup 6/Li beam. This reaction has a smaller production cross section and is therefore less suited for detailed studies.

• Research Organization: Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 5360307
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 21:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
BOUND STATE
CALCIUM 40 TARGET
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
CONVERSION
COULOMB FIELD
DECAY
DELAYED GAMMA RADIATION
ELECTRIC FIELDS
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
ENERGY RANGE
GAMMA RADIATION
GAMMA SPECTRA
HALF-LIFE
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION
IONIZING RADIATIONS
ISOTOPES
LITHIUM 6 REACTIONS
LITHIUM 7 REACTIONS
MEV RANGE
MEV RANGE 10-100
NEUTRON SPECTRA
NUCLEAR REACTIONS
NUCLEI
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
PROMPT GAMMA RADIATION
RADIATIONS
RADIOISOTOPES
SPECTRA
SPIN
TARGETS
VANADIUM 45
VANADIUM ISOTOPES