Large-Area Microcalorimeter Detectors for Ultra-High-Resolution X-Ray and Gamma-Ray Spectroscopy

M. K. Bacrania(Los Alamos National Laboratory), A. Hoover(Los Alamos National Laboratory), Peter Karpius(Los Alamos National Laboratory), M. W. Rabin(Los Alamos National Laboratory), C. R. Rudy(Los Alamos National Laboratory), Duc Vo(Los Alamos National Laboratory), James A. Beall(National Institute of Standards and Technology), D. A. Bennett(National Institute of Standards and Technology), W. B. Doriese(National Institute of Standards and Technology), G. C. Hilton(National Institute of Standards and Technology), Robert D. Horansky(National Institute of Standards and Technology), K. D. Irwin(National Institute of Standards and Technology), N. Jethava(National Institute of Standards and Technology), E. Sassi(National Institute of Standards and Technology), Joel N. Ullom(National Institute of Standards and Technology), Leila R. Vale(National Institute of Standards and Technology)
IEEE Transactions on Nuclear Science
August 1, 2009
10.1109/tns.2009.2022754
Cited by 40

Abstract

We discuss recent developments in using cryogenic microcalorimeter detectors for x- and gamma-ray spectroscopy. We are currently operating a detector array consisting of thirteen pixels with time-domain multiplexed readout. With a single pixel from this detector, we have measured 97.43-keV gamma rays from 153-Gd with 22-eV resolution (FWHM). We have also made the first multiplexed array measurements of plutonium x- and gamma-rays with 45-eV resolution. We are currently testing a 66-pixel next-generation detector chip. Preliminary measurements with the new detector indicate improved energy linearity and single-pixel energy resolution of 50-100 eV at 100 keV. We present preliminary calibration data from this chip, and a high-statistics multiplexed 21-pixel spectrum of the Pu x-ray region between 90 and 130 keV.

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