First Measurement of the Yield of ^8he Isotopes Produced in Liquid Scintillator by Cosmic-Ray Muons at Daya Bay

Daya Bay Collaboration, F. P. An,W. D. Bai,A. B. Balantekin,M. Bishai,S. Blyth, G. F. Cao,J. Cao,J. F. Chang, Y. Chang, H. S. Chen,H. Y. Chen, S. M. Chen,Y. Chen, Y. X. Chen,Z. Y. Chen,J. Cheng, Y. C. Cheng, Z. K. Cheng,J. J. Cherwinka,M. C. Chu,J. P. Cummings,O. Dalager,F. S. Deng,X. Y. Ding,Y. Y. Ding,M. V. Diwan,T. Dohnal,D. Dolzhikov,J. Dove, K. V. Dugas,H. Y. Duyang,D. A. Dwyer,J. P. Gallo,M. Gonchar, G. H. Gong, H. Gong,W. Q. Gu,J. Y. Guo,L. Guo, X. H. Guo,Y. H. Guo,Z. Guo,R. W. Hackenburg,Y. Han,S. Hans,M. He,K. M. Heeger,Y. K. Heng,Y. K. Hor,Y. B. Hsiung, B. Z. Hu, J. R. Hu,T. Hu, Z. J. Hu, H. X. Huang,J. H. Huang,X. T. Huang, Y. B. Huang,P. Huber,D. E. Jaffe, K. L. Jen,X. L. Ji,X. P. Ji,R. A. Johnson,D. Jones,L. Kang,S. H. Kettell,S. Kohn,M. Kramer,T. J. Langford, J. Lee, J. H. C. Lee, R. T. Lei,R. Leitner,J. K. C. Leung,F. Li,H. L. Li,J. J. Li,Q. J. Li,R. H. Li,S. Li,S. C. Li,W. D. Li,X. N. Li,X. Q. Li,Y. F. Li,Z. B. Li,H. Liang,C. J. Lin,G. L. Lin,S. Lin,J. J. Ling,J. M. Link,L. Littenberg,B. R. Littlejohn,J. C. Liu,J. L. Liu, J. X. Liu,C. Lu,H. Q. Lu,K. B. Luk, B. Z. Ma,X. B. Ma, X. Y. Ma,Y. Q. Ma,R. C. Mandujano,C. Marshall,K. T. McDonald,R. D. McKeown,Y. Meng, J. Napolitano,D. Naumov,E. Naumova,T. M. T. Nguyen,J. P. Ochoa-Ricoux,A. Olshevskiy,J. Park,S. Patton,J. C. Peng,C. S. J. Pun,F. Z. Qi,M. Qi,X. Qian,N. Raper,J. Ren,C. Morales Reveco,R. Rosero,B. Roskovec,X. C. Ruan,B. Russell,H. Steiner,J. L. Sun,T. Tmej,W. -H. Tse,C. E. Tull,Y. C. Tung,B. Viren,V. Vorobel, C. H. Wang,J. Wang,M. Wang, N. Y. Wang, R. G. Wang,W. Wang,X. Wang,Y. F. Wang,Z. Wang,Z. M. Wang,H. Y. Wei,L. H. Wei,W. Wei,L. J. Wen,K. Whisnant,C. G. White, H. L. H. Wong,E. Worcester,D. R. Wu,Q. Wu,W. J. Wu,D. M. Xia,Z. Q. Xie,Z. Z. Xing,H. K. Xu,J. L. Xu,T. Xu,T. Xue,C. G. Yang,L. Yang,Y. Z. Yang,H. F. Yao,M. Ye,M. Yeh,B. L. Young, H. Z. Yu,Z. Y. Yu,B. B. Yue,V. Zavadskyi,S. Zeng, Y. Zeng,L. Zhan,C. Zhang,F. Y. Zhang,H. H. Zhang, J. L. Zhang,J. W. Zhang,Q. M. Zhang,S. Q. Zhang,X. T. Zhang,Y. M. Zhang,Y. X. Zhang,Y. Y. Zhang,Z. J. Zhang, Z. P. Zhang,Z. Y. Zhang,J. Zhao,R. Z. Zhao,L. Zhou, H. L. Zhuang,J. H. Zou

arXiv (Cornell University)（2024）

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摘要

Daya Bay presents the first measurement of cosmogenic ^8He isotopeproduction in liquid scintillator, using an innovative method for identifyingcascade decays of ^8He and its child isotope, ^8Li. We also measure theproduction yield of ^9Li isotopes using well-established methodology. Theresults, in units of 10^-8μ^-1g^-1cm^2, are 0.307±0.042,0.341±0.040, and 0.546±0.076 for ^8He, and 6.73±0.73,6.75±0.70, and 13.74±0.82 for ^9Li at average muon energies of63.9 GeV, 64.7 GeV, and 143.0 GeV, respectively. The measured production rateof ^8He isotopes is more than an order of magnitude lower than any othermeasurement of cosmogenic isotope production. It replaces the results ofprevious attempts to determine the ratio of ^8He to ^9Li production thatyielded a wide range of limits from 0 to 30%. The results provide futureliquid-scintillator-based experiments with improved ability to predictcosmogenic backgrounds.

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