Study of Electromagnetic Transitions in Light Nuclei by Means of the Method of Angular Correlations of Pairs of Internal Conversion; ETUDE DE TRANSITIONS ELECTROMAGNETIQUES DANS LES NOYAUX LEGERS PAR LA METHODE DES CORRELATIONS ANGULAIRES DES PAIRES DE CONVERSION INTERNE
Technical Report
·
OSTI ID:4284956
Electromagnetic transitions between nuclear levels compete with the relatively rare process of internal conversion pairs. It is possible to demonstrate that the angular correlation of such a pair is very sensitive to the multipole order of the corresponding electromagnetic transition. Experimental measurement of the correlation demonstrated the multipolarity of gamma transitions. The energy of each of the electrons of the pairs is measured separately (this energy is spread out over a continuous spectrum); then the results are summed and the sum corresponds to the energy of the gamma transition. A certain number of transitions were characterized, allowing, in addition, the assignment of spin and parity to the levels concerned in the transition. The phenomenon of monopolar pairs is similar. It appears, for example, in the transitions 0/sup +/ yields 0/sup -/ (oxygen). Electromagnetic transition is naturally prohibited. The transition occurs by pairs. The angular correlation of these pairs was computed from Dirac theory. A more rigorous calculation, using modern quantum electrodynamics, gives a slightly different result, especially at angles 0 and 180 deg . This effect, which is difficult to obtain experimentally, would be of great interest if it could be realized. Attempts along this line are in progress. (auth)
- Research Organization:
- Inst. de Recherches Nucleaires, Strasbourg
- NSA Number:
- NSA-13-006965
- OSTI ID:
- 4284956
- Report Number(s):
- A/CONF.15/P/342
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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