Fabrication of Bismuth Absorber Arrays for NTD-Ge Hard X-ray Microcalorimeters
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Fabrication of Bismuth Absorber Arrays for NTD‑Ge Hard X‑ray Microcalorimeters S. Ferruggia Bonura1,2 · D. Gulli2 · M. Barbera1,2 · A. Collura2 · D. Spoto3,2 · P. Vassallo4 · S. Varisco2 · M. Santamaria4 · F. Di Franco4 · A. Zaffora4 · L. Botta4 · U. Lo Cicero1,2 Received: 20 August 2019 / Accepted: 15 May 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The high-spectral-resolution detection of hard X-rays (E > 20 keV) is a challenging and nearly unexplored area in space astrophysics. Traditionally hard X-ray detectors present moderate spectral resolutions, although few tens of eV one could open new frontiers in the study of nuclear processes and high-temperature plasma dynamics in energetic processes. This can be achieved by using cryogenic microcalorimeters. Within a research activity aimed at developing arrays of neutron transmutation-doped germanium (NTD-Ge) microcalorimeters for the high-spectral-resolution detection (about 50 eV@60 keV) of hard X-rays (20 keV
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