Observation of nuclear excitation by electron transition in 197Au with synchrotron X rays and an avalanche photodiode
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.
Kishimoto
S
Institute of Materials Structure Science, KEK, Tsukuba, Ibaraki 305-0801, Japan.
Yoda
Y
Seto
M
Kobayashi
Y
Kitao
S
Haruki
R
Kawauchi
T
Fukutani
K
Okano
T