Erratum： Observation of Tri-photon K-Shell X Rays [Chin. Phys. Lett. 23（2006）826]

The reported two peaks near 65.1 keV and 66.9 keV are not only the tri-photon coincidence counts but also the single photon of K-shell x-rays. These peaks contain two major decay components, i.e. fast T0/3 decay and slow 5.8-day decay. The 5.8-day decay corresponds to the ^195m Pt transition and the T0/3 decay corresponds to the reported tri-photon effect. According to the updated report from the vendor, our rhodium sample probably contains the unlisted impurity of 7-ppm platinum. The ^195m Pt transition is generated from this extremely small amount of Pt im- purity by the bremsstrahlung irradiation. The peak at 98.8keV in Fig.     

Observation of Tri-photon K-Shell X-Rays

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 Moessbauer 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 trl-photon count and the pile-up estimate differ by three orders of magnitude.     

Can a Single－Wall Carbon Nanotube be an X－Ray Waveguide？

We study the transport efficiency for x-rays of single-wall carbon nanotubes (SWCNTs) in theory. Three effects，i.e. refraction, absorption and x-ray tunneling loss, are considered. Our calculation shows that the SWCNT cannot be an x-ray waveguide due to the large x-ray tunneling loss. If the tunneling loss can be reduced effectively, a nanotube could be a waveguide.     

Rhodium Moessbauer Effect Generated by Bremsstrahlung Excitation

A method for effectively generating long-lived Moessbauer photons and methods for proving the associated ;Moessbauer effects are reported. For the first time, we observed resonant propagation and resonant absorption of 40-keV Moessbauer photons emitted from ^103Rh through （γ, γ′） process excited by bremsstrahlung. This is a new efficient way to generate long-lived isomer （〉 1ms） for Moessbauer spectroscopy with sufficient brilliance. An abnormally large ratio of resonant absorption between horizontal and vertical directions indicates horizontal trapping- of Moessbauer photons and anisotropic Mbssbauer emission, which can be attributed to gravitational effect on the ^103Rh Moessbauer isomer with extremely narrow 10^-19eV linewidth.