1Department of Engineering Physics, Tsinghua University, Beijing 100084
2Key Laboratory of Atomic and Molecular Nanosciences, Tsinghua University, Beijing 100084
3Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
Observation of Tri-photon K-Shell X-Rays
CHENG Yao1,2;XIA Bing1;LI Jin1,3
1Department of Engineering Physics, Tsinghua University, Beijing 100084
2Key Laboratory of Atomic and Molecular Nanosciences, Tsinghua University, Beijing 100084
3Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
Abstract： We report the observation of coincidence of three K-shell x-rays generated from the long-lived rhodium isomer excited by bremsstrahlung irradiation. Our previous report revealed that the E3 Mössbauer transition has anisotropic emission due to anisotropic gravitational acceleration [Chin. Phys. Lett. 22 (2005) 2530]. Now, from broader energy-resolved spectra, we further discover abnormal coincidences and abnormal sum energies of the three K-shell x-rays. The coincidence cannot be explained by currently understood photon statistics, since the measured tri-photon count and the pile-up estimate differ by three orders of magnitude.
2006, Vol. 23 
