S. Pasic et K. Ilakovac, Accurate determination of Compton backscattering in germanium at 86.5 keV on an absolute scale - art. no. 032722, PHYS REV A, 6103(3), 2000, pp. 2722
The double-differential cross section d(2)sigma/d Omega dE for Compton back
scattering in germanium was measured at the photon energy of 86.5 keV. The
experimental setup with two high-purity germanium detectors operating in th
e coincidence mode was applied. A multiline radioactive sourer of Eu-155(63
) was used as the source of photons. The Compton spectrum with a very small
background was obtained. A fast cascade was found to little influence the
data due to the 86.5 keV crossover transition. The contribution of a group
of processes, which is described as double cross talk between the two detec
tors, was also studied and results of calculations show their weak intensit
y. The calculations of other processes were made as in our earlier papers.
The values of d(2)sigma/d Omega dE were determined to an accuracy of better
than 4% on an absolute scale in a broad energy region. The calculated valu
es using the impulse approximation with hydrogenlike wave functions do nor,
reproduce well the cross sections in some energy regions.