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Phys. Rev. Lett. 85, 1831–1834 (2000)

Observation of Nuclear Excitation by Electron Transition in 197Au with Synchrotron X Rays and an Avalanche Photodiode

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S. Kishimoto1, Y. Yoda2, M. Seto3, Y. Kobayashi3, S. Kitao3, R. Haruki3, T. Kawauchi4, K. Fukutani4, and T. Okano4
1Institute of Materials Structure Science, KEK, Tsukuba, Ibaraki 305-0801, Japan
2Japan Synchrotron Radiation Research Institute, Mikazuki, Sayo, Hyogo 679-5198, Japan
3Research Reactor Institute, Kyoto University, Kumatori, Sennan, Osaka 590-0494, Japan
4Institute of Industrial Science, University of Tokyo, Roppongi, Minato-ku, Tokyo 106-8558, Japan

Received 7 December 1999; published in the issue dated 28 August 2000

See accompanying Physics Focus

We have succeeded in observing nuclear excitation by electron transition (NEET) in 197Au by a new method. Monochromatic x-rays of synchrotron radiation were used to ionize the K shell of gold atoms in a target foil. The internal-conversion electrons emitted from excited nuclei were detected with a silicon avalanche photodiode. At a photon energy of 80.989 keV, the NEET probability in 197Au was determined to be (5.0±0.6)×10-8 from a comparison of the event number per photon between NEET and the nuclear resonance at 77.351 keV.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.1831
DOI:
10.1103/PhysRevLett.85.1831
PACS:
23.20.Nx, 25.20.Dc, 27.80.+w, 82.80.Ej
 
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