Beta-ray branching and half-lives of /sup 12/B and /sup 12/N
The ratio of /sup 12/B and /sup 12/N ..beta..-ray branches to the 4.44-MeV excited state of /sup 12/C was measured by detecting ..beta.. rays in a 4..pi.. plastic scintillator and ..gamma.. rays in two Ge(Li) detectors. Activities were made in the /sup 11/B(d,p)/sup 12/B and /sup 10/B(/sup 3/He,n)/sup 12/N reactions using a chopped Van de Graaff beam. Data were stored in two successive computer time bins of two half-lives each in order to establish by subtraction the shape of the short-lived ..beta..-ray spectrum and its net number of counts. The ratio of these branches was found to be /sup 12/N//sup 12/B = 1.56 +- 0.05. A measurement of the /sup 12/B absolute ..beta..-ray branch to the 4.44-MeV state via ..beta..-..gamma.. coincidences using an NaI(Tl) detector for the ..gamma.. rays gave a value of 1.276 +- 0.050%. Half-lives, obtained by multiscaling ..beta..-ray counts, were found to be 20.20 +- 0.02 msec for /sup 12/B and 11.000 +- 0.016 msec for /sup 12/N. The mirror asymmetries derived from these results are delta = +0.044 +- 0.034 for the decay to the 4.44-MeV state of /sup 12/C and delta = +0.129 +- 0.008 for the branch to the ground state.
- Research Organization:
- Brookhaven National Laboratory, Upton, New York 11973
- OSTI ID:
- 5075644
- Journal Information:
- Phys. Rev., C; (United States), Vol. 17:1
- Country of Publication:
- United States
- Language:
- English
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NITROGEN 12
BETA-PLUS DECAY
BORON 12
BETA-MINUS DECAY
BRANCHING RATIO
CARBON 12
COINCIDENCE SPECTROMETRY
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
GAMMA SPECTRA
GROUND STATES
HALF-LIFE
BASIC INTERACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BORON ISOTOPES
CARBON ISOTOPES
DECAY
ENERGY LEVELS
EVEN-EVEN NUCLEI
INTERACTIONS
ISOTOPES
LEPTONIC DECAY
LIGHT NUCLEI
NITROGEN ISOTOPES
NUCLEI
ODD-ODD NUCLEI
PARTICLE DECAY
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SPECTRA
STABLE ISOTOPES
WEAK INTERACTIONS
WEAK PARTICLE DECAY
651322* - Nuclear Properties & Reactions
A=6-19
Experimental- Radioactive Decay- (-1987)