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Title: Production rate measurement of Tritium and other cosmogenic isotopes in Germanium with CDMSlite

Journal Article · · Astroparticle Physics

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:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Univ. of South Dakota, Vermillion, SD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
SuperCDMS Collaboration
Grant/Contract Number:
15-S-33; AC02-07CH11359; AC05-76RL01830; AC02-76SF00515; SC0015657
OSTI ID:
1481213
Alternate ID(s):
OSTI ID: 1489335; OSTI ID: 1598289; OSTI ID: 1601042
Report Number(s):
PNNL-SA-135963; PII: S0927650518301774
Journal Information:
Astroparticle Physics, Vol. 104, Issue C; ISSN 0927-6505
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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