title: Observation of nuclear excitation by electron transition in 197Au with synchrotron X rays and an avalanche photodiode
abstract: 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)x10(-8) from a comparison of the event number per photon between NEET and the nuclear resonance at 77.351 keV.
authors.affiliation: Institute of Materials Structure Science, KEK, Tsukuba, Ibaraki 305-0801, Japan.
authors.initials: S
authors.lastname: Kishimoto
authors.initials: Y
authors.lastname: Yoda
authors.initials: M
authors.lastname: Seto
authors.initials: Y
authors.lastname: Kobayashi
authors.initials: S
authors.lastname: Kitao
authors.initials: R
authors.lastname: Haruki
authors.initials: T
authors.lastname: Kawauchi
authors.initials: K
authors.lastname: Fukutani
authors.initials: T
authors.lastname: Okano