CIRCULAR POLARIZATION OF EXTERNAL BREMSSTRAHLUNG FROM $beta$-RAYS IN MAGNETIZED TARGETS
The degree of circular polarization of the external bremsstrahlung, produced by beta -rays from Y/sup 90/ in magnetized targets of silver and annealed Armco iron was investigated. It was found that the polarization is greater when the momentum of the radiating electron is backward with respect to the target magnetization. The ratio of the polarizations corresponding to backward and forward momenta is nearly independent of the quantum energy and equal to 1.33 plus or minus 0.09 (B =4400 gauss) and 1.53 plus or minus 0.09 (B = 7000 gauss) respectively for Ag and Fe targets. A small effect was also detected by measuring the polarization of the external bremsstrahlung produced in a weakly magnetized iron target, relative to that produced in a highly magnetized target, when the magnetization was perpendicular to the electron momentum. The ratio of the polarizations, not greater than 1.17 and also independent of the quantum energy, appears to be a complicated function of the magnetization. No such effect was detected when silver targets were used under the latter conditions. (auth)
- Research Organization:
- Istituto di Fisica del Politecnico, Milan
- NSA Number:
- NSA-14-013236
- OSTI ID:
- 4174258
- Journal Information:
- Nuclear Phys., Journal Name: Nuclear Phys. Vol. Vol: 15
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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