Measurement of the beta-gamma circular polarization correlation for the 0. 944 MeV positron and the 0. 720 MeV negatron of /sup 74/As

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5005038

Purcell, R M

The beta-gamma circular-polarization correlations associated with the 0.944 MeV positron and the 0.720 MeV negatron transitions of /sup 74/As have been measured as an average over the respective energy intervals E/sub ..beta../ = 0.30 to 0.94 MeV and Esub ..beta../ = 0.30 to 0.72 MeV. Two scintillation beta detectors, one at an instrument angle of 135 degrees and the other at an instrument angle of 150 degrees were employed. The method used was the forward Compton scattering of gamma-rays from magnetized iron. Special data analysis techniques were used to extract the best values of delta from experimental data that was considerably distorted from effects caused by the positron annihilation radiation. In addition, the non-linear response inherent to scintillation detectors was corrected for. The experimental data gave the following results for delta for the positron at 135 degrees, delta = -.0039 +/- 0.0035. At 150 degrees, delta = 0.0054 +/- 0.0028. For the negatron transition at 135 degrees, delta = 0.006 +/- 0.014. At 150 degrees delta = -0.005 +/- 0.011. Particularly of note is the fact that the signs of delta differ between the two instrument angles, necessitating a non-zero value of A/sub 3/. This suggests that the nature of admixing of the independent particle states which make up the actual nuclear states involved in the transition should be of considerable interest to nuclear theorists. Using the accepted value of A/sub 2/ for the positron transition and the experimental data yields the following result for P/sub ..gamma..: P/sub ..gamma..(/sup 74/As: 0.30 MeV

• Research Organization: Bryn Mawr Coll., PA (USA). Graduate School of Social Work and Social Research
• OSTI ID: 5005038
• Country of Publication: United States
• Language: English

Related Subjects

651622* -- Nuclear Properties & Reactions
A=59-89
Experimental-- Radioactive Decay-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ARSENIC 74
ARSENIC ISOTOPES
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY
BETA-PLUS DECAY RADIOISOTOPES
CONFIGURATION MIXING
CORRELATIONS
DATA
DAYS LIVING RADIOISOTOPES
DECAY
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
EXPERIMENTAL DATA
GAMMA RADIATION
INFORMATION
INTERACTIONS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
POLARIZATION
RADIATIONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES