SIMULATION OF COMPTON DOUBLE SCATTERING

Yukinobu Kakutani, Akihisa Koizumi and Nobuhiko Sakai

Graduate School and Faculty of Science, Himeji Institute of Technology, Hyogo 678-1297, Japan (yukinobu@sci.himeji-tech.ac.jp).

In 1987, a simulation of magnetic Compton double scattering of circularly polarized photons by magnetic electrons was reported by Sakai[1]. This simulation code was suitable for the magnetic Compton scattering (MCS) experiments using gamma-ray sources, in which no linear polarization of the incident gamma-rays presented.

We have made a new simulation code including both linear and circular polarizations of incident photons, which is suitable for the MCS experiments utilizing synchrotron radiation x-rays.

First, the validity of the present simulation was confirmed by the reproducction of the experimental ratio between Compton double scattering result on Ge measured by Pasic et al[2]. The agreement between the simulation and experimental result is good, as shown in Fig. 1. Second, it was confirmed that the intensity of Compton double scattering depends on polarization of incident photons, material, incident energy and sample volume.

Concerning to the spin-dependent Compton double scattering, a result of simulation on Fe (2 mm height, 10 mm wide and 10 mm thickness), showed that the influence of magnetic Compton double scattering on 3d transition metal is negligible for ordinary measurements.

(a) (b)

Fig.1: Results of Compton double scattering on Ge. (a) present simulation, a Lorenz type function is assumed to simulate Compton broadening. (b) experiment by Pasic et al[2].

References

1 Sakai, N., (1987) J. Phys. Soc. Jpn. 56, 2477-2485.

2 Pasic, S and Ilakovac, K., (1997) Phys. Rev. A 55, 4248-4252.