Production Rate Measurement of Tritium and Other Cosmogenic Isotopes in Germanium with CDMSlite
Future direct searches for low-mass dark matter particles with germanium detectors, such as SuperCDMS SNOLAB, are expected to be limited by backgrounds from radioactive isotopes activated by cosmogenic radiation inside the germanium. There are limited experimental data available to constrain production rates and a large spread of theoretical predictions. We examine the calculation of expected production rates, and analyze data from the second run of the CDMS low ionization threshold experiment (CDMSlite) to estimate the rates for several isotopes. We model the measured CDMSlite spectrum and fit for contributions from tritium and other isotopes. Using the knowledge of the detector history, these results are converted to cosmogenic production rates at sea level. The production rates in atoms/(kg$$\cdot$$day) are 74$$\pm$$9 for $^3$H, 1.5$$\pm$$0.7 for $$^{55}$$Fe, 17$$\pm$$5 for $$^{65}$$Zn, and 30$$\pm$$18 for $$^{68}$$Ge.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- SuperCDMS
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1462727
- Report Number(s):
- FERMILAB-PUB-18-289-AE; arXiv:1806.07043; 1678471
- Journal Information:
- TBD, Journal Name: TBD
- Country of Publication:
- United States
- Language:
- English
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Production rate measurement of Tritium and other cosmogenic isotopes in Germanium with CDMSlite
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