Monochromatic x rays have been used to explore the phenomenon of nuclear excitation by electronic transition (NEET) in the atomic/nuclear system. A new theoretical approach to calculating this process has also been developed and predicts a value for the “NEET probability,” of is the probability that a given atomic excitation (in this case a K vacancy), will result in the excitation of a specific nuclear state (in this case the 69.5-keV level in This value is much lower than most of the calculated values given in the literature for this system. Our measurement gives the result an upper limit which is several orders of magnitude lower than the values found in previous measurements, but which is consistent with the new calculation.
- Received 28 January 2000
- Published 21 April 2000
© 2000 The American Physical Society