beta. /sup +/ decay of /sup 47/Cr

Journal Article · Mon Apr 01 04:00:00 EST 1985 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.31.1490· OSTI ID:6024003

Burrows, T W; Olness, J W; Alburger, D E

The ..beta../sup +/ decay of /sup 47/Cr (J/sup ..pi../,T = (3/2)/sup -/,(1/2)) has been studied following its production by the /sup 9/Be(/sup 40/Ca, 2n)/sup 47/Cr reaction at E( /sup 40/Ca)roughly-equal90 MeV. In addition to the previously reported superallowed decay to the mirror state (i.e., the /sup 47/V ground state), we observe a (3.7 +- 1.2)% allowed ..beta../sup +/ branch to the (5/2)/sup -/ state at 87 keV in /sup 47/V. These two branches appear to dominate the decay of /sup 47/Cr; an upper limit of less than 0.5% is set on possible ..gamma.. rays, other than the 87-keV ..gamma.. ray, in the range of 15 to 2800 keV. Measurement of the time decay of the 87-keV ..gamma.. ray establishes a value of T/sub 1/2/ = 508 +- 10 ms for the /sup 47/Cr half-life which is in significant disagreement with two previously reported values. The present work utilized Ge spectroscopy and a He-jet system for transport of the beam-induced radioactivity, as opposed to previous measurements which used a plastic scintillator to detect positrons and either a He-jet chopper or a slow beam-pulsing system. A summary of decay data for the complete f/sub 7/2/ shell series of mirror nuclei is also presented.

• Research Organization: Brookhaven National Laboratory, Upton, New York 11973
• OSTI ID: 6024003
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 31:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYONS
BERYLLIUM 9 TARGET
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY
BETA-PLUS DECAY RADIOISOTOPES
CALCIUM 40 REACTIONS
CHARGED-PARTICLE REACTIONS
CHROMIUM 47
CHROMIUM ISOTOPES
COMPOUND-NUCLEUS REACTIONS
DECAY
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-ODD NUCLEI
FERMIONS
GAMMA RADIATION
HADRONS
HALF-LIFE
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
MEV RANGE
MEV RANGE 10-100
MINUTES LIVING RADIOISOTOPES
MIRROR NUCLEI
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
RADIATIONS
RADIOISOTOPES
SPIN
TARGETS
VANADIUM 47
VANADIUM ISOTOPES