In search of the third dimension in Compton X-ray polarimeters
Abstract
Compton polarimeters are typically designed to be sensitive only to the azimuthal angle of the scattered photon, ignoring the scattering angle. Such a 2-dimensional reconstruction of the event is pursued for both simplicity and because the polarization of the incident photon influences only the azimuthal response of the instrument. While this is true for on-axis sources, when the source starts to be off-axis of several degrees the azimuthal response of the instrument is effectively a convolution of the azimuthal and polar scattering angles: measuring the latter would provide a better sensitivity and smaller systematic effects. In this contribution, we will present a design which allows to estimate the scattering angle in a Compton polarimeter through the read-out of the light signal at the two ends of scintillator bars. Such a design is being tested with a representative set-up and first results on the performance are presented.
Versions
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BibTeX
@misc{muleri2026search,
title = {{In search of the third dimension in Compton X-ray polarimeters}},
author = {Fabio Muleri and Riccardo Campana and Edoardo Borciani and Lorenzo Amati and Enrico Costa and Nicolas De Angelis and Ettore Del Monte and Alessandro Di Marco and Sergio Fabiani and Mauro Fiorini and Dawoon E. Kim and Riccardo Ferrazzoli and Fabio La Monaca and Carlo Lefevre and Giovanni Lombardi and Hemanth Manikantan and Ezequiel J. Marchesini and Romana Mikusincova and Alfredo Morbidini and Alessio Nuti and John Rankin and Ajay Ratheesh and Alda Rubini and Paolo Soffitta and Enrico Virgilli},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.29900},
eprint = {2610.29900},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.29900},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - In search of the third dimension in Compton X-ray polarimeters
AU - Fabio Muleri
AU - Riccardo Campana
AU - Edoardo Borciani
AU - Lorenzo Amati
AU - Enrico Costa
AU - Nicolas De Angelis
AU - Ettore Del Monte
AU - Alessandro Di Marco
AU - Sergio Fabiani
AU - Mauro Fiorini
AU - Dawoon E. Kim
AU - Riccardo Ferrazzoli
AU - Fabio La Monaca
AU - Carlo Lefevre
AU - Giovanni Lombardi
AU - Hemanth Manikantan
AU - Ezequiel J. Marchesini
AU - Romana Mikusincova
AU - Alfredo Morbidini
AU - Alessio Nuti
AU - John Rankin
AU - Ajay Ratheesh
AU - Alda Rubini
AU - Paolo Soffitta
AU - Enrico Virgilli
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.29900
UR - https://arxiv.org/abs/2610.29900
AB - Compton polarimeters are typically designed to be sensitive only to the azimuthal angle of the scattered photon, ignoring the scattering angle. Such a 2-dimensional reconstruction of the event is pursued for both simplicity and because the polarization of the incident photon influences only the azimuthal response of the instrument. While this is true for on-axis sources, when the source starts to be off-axis of several degrees the azimuthal response of the instrument is effectively a convolution of the azimuthal and polar scattering angles: measuring the latter would provide a better sensitivity and smaller systematic effects. In this contribution, we will present a design which allows to estimate the scattering angle in a Compton polarimeter through the read-out of the light signal at the two ends of scintillator bars. Such a design is being tested with a representative set-up and first results on the performance are presented.
ER -