January 3, 2019
Journal Article

Production Rate Measurement of Tritium and Other Cosmogenic Isotopes in Germanium with CDMSlite

E Figueroa-Feliciano
A Villano
Isaac Arnquist
Z Hong
V Mandic
X Zhao
D Speller
Elham Azadbakht
A Reisetter
S Scorza
B Serfass
R Schnee
J Morales Mendoza
A Jastram
A Kennedy
D Wright
Ben Loer
D. Cerdeno
M Fritts
L Hsu
M Huber
J Sander
T. Aralis
J Nelson
H Qiu
Tom Ren
T Saab
M Ghaith
S Watkins
J Wilson
C Jena
R Mahapatra
D Toback
B Young
C Cartaro
T Doughty
Joseph Street
T Aramaki
W Baker
D. Bauer
H Harris
Richard Lawrence
Y. Chang
H Tanaka
Matthew Wilson
Caleb Fink
G Gerbier
M Kelsey
R Partridge
S Poudel
T Reynolds
B Sadoulet
M Bowles
J Cooley
B Cornell
R Germond
D Jardin
P Lukens
E Lopez Asamar
M Pepin
W Rau
A Robinson
K Senapati
Ryan Underwood
Joshua Winchell
R Agnese
N Mast
A Kubik
M Mirabolfathi
B Mohantry
A Roberts
H Rogers
Andrew Scarff
E Fascione
Francisco Ponce
M Pyle
Samir Banik
B. Von Krosigk
N Kurinsky
X Zhang
Paul Brink
M Stein
Eric Hoppe
V Iyer
D Macdonell
E Miller
D Barker
T. Binder
Priscilla Cushman
S Golwala
Raymond Bunker III
B Cabrera
R Calkins
John Orrell
S Oser
W Page
S Yellin
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·day) are 74±9 for 3H, 1.5±0.7 for 55Fe, 17±5 for 65Zn, and 30±18 for 68Ge.

Revised: January 3, 2019 | Published: January 1, 2019

Agnese R., T. Aralis, T. Aramaki, I.J. Arnquist, E. Azadbakht, W. Baker, and D. Barker, et al. 2019. "Production Rate Measurement of Tritium and Other Cosmogenic Isotopes in Germanium with CDMSlite." Astroparticle Physics 104. PNNL-SA-135963. doi:10.1016/j.astropartphys.2018.08.006