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ID 20650
file
creator
Mizuno, Tunefumi
Kamae, Tsuneyoshi
Ng, J. S. T.
Tajima, Hiroyasu
Mitchell, J. W.
Streitmatter, R.
Fernholz, R. C.
Groth, E.
subject
Polarimetry
Balloon
Gamma-ray
Monte Carlo
NDC
Astronomy. Space sciences
abstract
Polarization measurements in the X-ray and gamma-ray energy range can provide crucial information on massive compact objects such as black holes and neutron stars. The Polarized Gamma-ray Observer (PoGO) is a new balloon-borne instrument designed to measure polarization from astrophysical objects in the 30-100 keV range, under development by an international collaboration with members from United States, Japan, Sweden and France. To examine PoGO's capability, a beam test of a simplified prototype detector array was conducted at the Argonne National Laboratory Advanced Photon Source. The detector array consisted of seven plastic scintillators, and was irradiated by polarized photon beams at 60, 73, and 83 keV. The data showed a clear polarization signal, with a measured modulation factor of 0.42 ± 0.01. This was successfully reproduced at the 10% level by the computer simulation package Geant4 after modifications to its implementation of polarized Compton/Rayleigh scattering. Details of the beam test and the validation of the Geant4 simulations are presented.
journal title
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
volume
Volume 540
issue
Issue 1
start page
158
end page
168
date of issued
2005-03-11
publisher
Elsevier Science B.V.
issn
0168-9002
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2004 Elsevier B.V.
relation url
department
Graduate School of Science