Abstract
We are developing metallic magnetic calorimeters for high-resolution gamma-ray spectroscopy for non-destructive assay of nuclear materials. Absorbers for these higher-energy photons can require substantial thickness to achieve adequate stopping power. We developed a new absorber fabrication process using dry-film photoresists to electroform cantilevered, thick absorbers. Gamma detectors with these absorbers have an energy resolution of 38 eV FWHM at 60 keV. In this report, we summarize modifications to STARCryo’s “Delta 1000” process for our devices and describe the new absorber fabrication process.
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Acknowledgements
This work was funded by the U.S. Department of Energy Office of Non-proliferation R&D (NA-22) under grant LL16-MagMicro-PD2La. It was performed under the auspices of the U.S. DOE by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
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Hummatov, R., Hall, J.A., Kim, GB. et al. Fabrication of High-Resolution Gamma-Ray Metallic Magnetic Calorimeters with Ag:Er Sensor and Thick Electroplated Absorbers. J Low Temp Phys 193, 752–757 (2018). https://doi.org/10.1007/s10909-018-1946-8
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DOI: https://doi.org/10.1007/s10909-018-1946-8