Abstract
Intrinsic radiation of materials is one of the major backgrounds for many rare-event search experiments. Thus, the production of pure materials in an underground laboratory is a promising approach for eliminating cosmogenic radionuclides. In this paper, we demonstrate a procedure to evaluate the yields of cosmogenic radionuclides in copper and germanium in the second phase of the China Jinping Underground Laboratory. Our results show that for copper and germanium materials, the largest cosmogenic background comes from \(^{3}\)H and \(^{57,58,60}\)Co, and \(^{3}\)H and \(^{68}\)Ge, respectively, which all have yields on the order of \(10^{-7} \;{\mathrm {kg}}^{-1}\,{\mathrm {day}}^{-1}\). The corresponding radioactivities after 90 days pf exposure underground are estimated to be lower than 10−6 μBq kg−1.
Similar content being viewed by others
References
K.J. Kang, J.P. Cheng, J. Li et al., Introduction to the CDEX experiment. Front. Phys. 8, 412–437 (2013). https://doi.org/10.1007/s11467-013-0349-1
C.E. Aalseth, P.S. Barbeau, J. Colaresi et al., CoGeNT: a search for low-mass dark matter using p-type point contact germanium detectors. Phys. Rev. D Part. Fields Gravit. Cosmol. 88, 012002 (2013). https://doi.org/10.1103/PhysRevD.88.012002
R. Agnese, A.J. Anderson, T. Aramaki et al., Projected sensitivity of the SuperCDMS SNOLAB experiment. Phys. Rev. D 95, 082002 (2017). https://doi.org/10.1103/PhysRevD.95.082002
E. Armengaud, Q. Arnaud, C. Augier et al., Measurement of the cosmogenic activation of germanium detectors in edelweiss-III. Astropart. Phys. 91, 51–64 (2017). https://doi.org/10.1016/j.astropartphys.2017.03.006
M. Agostini, M. Allardt, A.M. Bakalyarov et al., Background-free search for neutrinoless double-\(\beta\) decay of \(^{76}\)Ge with GERDA. Nature 544, 47–52 (2017). https://doi.org/10.1038/nature21717
N. Abgrall, I.J. Arnquist et al., The Majorana demonstrator radioassay program. Nucl. Instrum. Methods Phys. Res. Sect. A Acc. Spectrom. Detect. Assoc. Equip. 828, 22–36 (2016). https://doi.org/10.1016/j.nima.2016.04.070
J. Ma, Q. Yue, S. Lin et al., Study on cosmogenic activation in germanium detectors for future tonne-scale cdex experiment. Sci. China Phys. Mech. Astron. 62, 11011 (2018). https://doi.org/10.1007/s11433-018-9215-0
C. Patrignani et al., Particle data group. Review of particle physics. Chin. Phys. C 40(10), 421–428 (2016). https://doi.org/10.1088/1674-1137/40/10/100001
Y.-C. Wu, X.-Q. Hao, Q. Yue et al., Measurement of cosmic ray flux in the China JinPing underground laboratory. Chin. Phys. C 37, 086001 (2013). https://doi.org/10.1088/1674-1137/37/8/086001
J. Su, Z. Zeng et al., Monte Carlo simulation of muon radiation environment in China Jinping Underground Laboratory. High Power Laser Part. Beams 24 2012(12), 3015–3018 (2012). https://doi.org/10.3788/HPLPB20122412.3015
V.A. Kudryavtsev, Muon simulation codes MUSIC and MUSUN for underground physics. Comput. Phys. Commun. 180(3), 339–346 (2009). https://doi.org/10.1016/j.cpc.2008.10.013
T.K. Gaisser, R. Engel, E. Resconi, Cosmic Rays and Particle Physics, 2nd edn. (Cambridge University Press, Cambridge, 2016), pp. 1–29. https://doi.org/10.1017/CBO9781139192194
S. Agostinelli et al., Geant4-a simulation toolkit. Nucl. Instrum. Methods Phys. Res. Sect. A Accel. Spectrom. Detect. Assoc. Equip. 506(3), 250–303 (2003). https://doi.org/10.1016/S0168-9002(03)01368-8
J.J. Back, Y.A. Ramachers, ACTIVIA: calculation of isotope production cross-sections and yields. Nucl. Instrum. Methods Phys. Res. Sect. A Accel. Spectrom. Detect. Assoc. Equip. 586, 286–294 (2008). https://doi.org/10.1016/j.nima.2007.12.008
Q. Hu, H. Ma, Z. Zeng et al., Neutron background measurements at China Jinping underground laboratory with a Bonner multisphere spectrometer. Nucl. Instrum. Methodds A 859, 37–40 (2017). https://doi.org/10.1016/j.nima.2017.03.048
Author information
Authors and Affiliations
Corresponding author
Additional information
This work was supported by the National Natural Science Foundation of China (No. U1865205).
Rights and permissions
About this article
Cite this article
Zeng, WH., Ma, H., Zeng, M. et al. Evaluation of cosmogenic activation of copper and germanium during production in Jinping Underground Laboratory. NUCL SCI TECH 31, 50 (2020). https://doi.org/10.1007/s41365-020-00760-3
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/s41365-020-00760-3