THE PENETRATION EFFECT IN ELECTRIC DIPOLE INTERNAL CONVERSION
Nuclear-structure-dependent contributions to the internal conversion process are considered in conjunction with highly retarded electric dipole transitions. Formulas for a theory of anomalous internal conversion for electric transitions are given. These formulas are applied to explain the strong El anomalies found for L conversion. Two different types of anomalous matrix elements occur-one associated with the nuclear charge, the other with the nuclear current. It is found that the contribution associated with charge is negligible. In the current terms two pants are also found, the convection current and spin current, which are associated with different selection rules and which generally are both important. From the empirical data of the L/sub I/ and L/sub II/ anomaly the sign of the ratio of nuclear matrix elements that giwes the dominant contribution to the anomalous conversion amplitude is deduced. The anomalous nuclear matrix elements are evaluated for the single-particle model. Effects of pair correlation are discussed. Agreement is found with experiments. (auth)
- Research Organization:
- Univ. of California, Berkeley
- NSA Number:
- NSA-16-023102
- OSTI ID:
- 4822728
- Report Number(s):
- UCRL-9877
- Journal Information:
- Nuclear Phys., Journal Name: Nuclear Phys. Vol. Vol: 35
- Country of Publication:
- United States
- Language:
- English
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