Characterization and Prediction of the SPI Background

Details Characterization and Prediction of the SPI Background Characterization and Prediction of the SPI Background

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.552..819t&link_type=abstract

Proceedings of the 5th INTEGRAL Workshop on the INTEGRAL Universe (ESA SP-552). 16-20 February 2004, Munich, Germany. Scientific

Computer Science

Performance

4

Scientific paper

The INTEGRAL Spectrometer (SPI), like most gamma-ray instruments, is background dominated. Signal-to-background ratios of a few percent are typical. The background is primarily due to interactions of cosmic rays in the instrument and spacecraft, and it characteristically varies by ± 5% on time scales of days or longer. This variation is caused mainly by fluctuations in the interplanetary magnetic field that modulate the cosmic-ray intensity. To achieve the maximum performance from SPI it is essential to have a high quality model of the background that can predict its value to a fraction of a percent. In this paper we characterize the background and its variability, explore various models, and evaluate the accuracy of their predictions. Particular emphasis is placed on the 511-keV background as electron-positron annihilation radiation is one of the prime scientific objectives of INTEGRAL.

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