Calibration of segmented BGO scintillation detectors for space-based gamma-ray polarimeter

IF 2.7 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Experimental Astronomy Pub Date : 2025-02-01 DOI:10.1007/s10686-025-09977-9

A. Mkrtchyan, A. Pozanenko, P. Minaev, A. Strizhak, A. Ivashkin, A. Baranov, S. Musin

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Abstract

In the gamma range, polarization detection is particularly difficult. For example, the registration of linear polarization can help in determining the structure of the magnetic field in a jet when generating radiation in gamma-ray bursts. The measurement of linear polarization in the 511 keV line associated with the annihilation of electrons and positrons may be an indicator of the asymmetry of the distribution of radioactive nickel in the scattering shell of Supernovae. The principle of detecting the polarization of gamma radiation is based on the anisotropy of Compton scattering. This property can be used in the development of polarimeters, which are a segmented scintillation detector. The paper presents polarization calibrations for 3 BGO detectors, which are a simplified prototype of a segmented gamma-ray spectrometer (SGS) being developed for the Chibis-AI microsatellite. The complete assembly of the SGS detector consists of 32 BGO bars. Polarization calibrations of the SGS prototype in the 511 keV line were carried out at the experimental facility at the Institute for Nuclear Research of the Russian Academy of Sciences using the isotope \(^{22}\text {Na}\). Also, for comparison, a simulation of the registration of linear polarization was carried out using the Geant4 software package. The experimental results agree withing \(2\sigma \) of simulations.

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来源期刊

Experimental Astronomy 地学天文-天文与天体物理

CiteScore

5.30

自引率

3.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Many new instruments for observing astronomical objects at a variety of wavelengths have been and are continually being developed. Furthermore, a vast amount of effort is being put into the development of new techniques for data analysis in order to cope with great streams of data collected by these instruments. Experimental Astronomy acts as a medium for the publication of papers of contemporary scientific interest on astrophysical instrumentation and methods necessary for the conduct of astronomy at all wavelength fields. Experimental Astronomy publishes full-length articles, research letters and reviews on developments in detection techniques, instruments, and data analysis and image processing techniques. Occasional special issues are published, giving an in-depth presentation of the instrumentation and/or analysis connected with specific projects, such as satellite experiments or ground-based telescopes, or of specialized techniques.