Science Archives Publication System

Numerical modeling of mapping of Martian epithermal neutron emission: Applications to FREND investigation onboard ESA's Trace Gas Orbiter

DOI: 10.1016/j.nima.2022.166997 Bibcode: 2022NIMPA103966997M

Mitrofanov, I. G.; Golovin, D. V.; Litvak, M. L. +2 more

Neutron telescope FREND is operating onboard ESA TGO mission from May 2018 till present. The instrument measures epithermal neutron flux from the Martian surface. Measured variations of the neutron flux may be used to determine hydrogen abundance in the soil usually interpreted as a water/water ice. The unique design of the instrument provides mea…

2022 • Nuclear Instruments and Methods in Physics Research A

ExoMars-16 0

Spectral signature of near-surface damage in CdTe X-ray detectors

DOI: 10.1016/j.nima.2019.163104 Bibcode: 2020NIMPA.95363104G

Grimm, O.

Knowledge of the response matrix of an X-ray detector is an important prerequisite for efficient use. This matrix is usually complicated due to the multitude of effects that determine the photon interaction and energy detection processes. Consequently, assembly of a response matrix often proceeds via simulation, modelling features of the detector …

2020 • Nuclear Instruments and Methods in Physics Research A

SolarOrbiter 1

Changes in detection characteristics of CdTe X-ray sensors by proton irradiation

DOI: 10.1016/j.nima.2020.164116 Bibcode: 2020NIMPA.97264116G

Commichau, V.; Grimm, O.; Bednarzik, M. +1 more

This paper reports on the performance changes in CdTe:Cl semiconductor X-ray detectors seen after irradiation with 50 MeV protons up to a fluence of 1.6 ṡ10¹¹cm^-2. The rationale for the irradiation parameters is described. Performance was quantified before and after irradiations by obtaining X-ray spectra with a barium-133 ra…

2020 • Nuclear Instruments and Methods in Physics Research A

SolarOrbiter 1

Modeling of proton-induced radioactivation background in hard X-ray telescopes: Geant4-based simulation and its demonstration by Hitomi's measurement in a low Earth orbit

DOI: 10.1016/j.nima.2018.02.071 Bibcode: 2018NIMPA.891...92O

Enoto, Teruaki; Yamaoka, Kazutaka; Fukazawa, Yasushi +47 more

Hard X-ray astronomical observatories in orbit suffer from a significant amount of background due to radioactivation induced by cosmic-ray protons and/or geomagnetically trapped protons. Within the framework of a full Monte Carlo simulation, we present modeling of in-orbit instrumental background which is dominated by radioactivation. To reduce th…

2018 • Nuclear Instruments and Methods in Physics Research A

Hitomi 17

Astronomical imaging with the X-ray observatory Hitomi

DOI: 10.1016/j.nima.2017.02.023 Bibcode: 2017NIMPA.873...16N

Nakajima, Hiroshi; Hitomi Collaboration

We report an imaging capability of the Japan-led X-ray observatory Hitomi, formerly known as ASTRO-H. It carries four scientific instruments of Soft X-ray Imager (SXI: CCD camera), Hard X-ray Imager (HXI), Soft X-ray Spectrometer, and Soft Gamma-ray Detector, allowing us to perform a wide-band high-sensitive imaging spectroscopy. We highlight the …

2017 • Nuclear Instruments and Methods in Physics Research A

Hitomi 4

The Si/CdTe semiconductor camera of the ASTRO-H Hard X-ray Imager (HXI)

DOI: 10.1016/j.nima.2016.03.038 Bibcode: 2016NIMPA.831..235S

Kokubun, Motohide; Makishima, Kazuo; Nakazawa, Kazuhiro +27 more

The Hard X-ray Imager (HXI) is one of the instruments onboard the ASTRO-H mission [1-4] to be launched in early 2016. The HXI is the focal plane detector of the hard X-ray reflecting telescope that covers an energy range from 5 to 80 keV. It will execute observations of astronomical objects with a sensitivity for point sources as faint as 1/100,00…