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. 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. 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（2024）
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摘要
Daya Bay presents the first measurement of cosmogenic ^8He isotope
production in liquid scintillator, using an innovative method for identifying
cascade decays of ^8He and its child isotope, ^8Li. We also measure the
production yield of ^9Li isotopes using well-established methodology. The
results, 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 of
63.9 GeV, 64.7 GeV, and 143.0 GeV, respectively. The measured production rate
of ^8He isotopes is more than an order of magnitude lower than any other
measurement of cosmogenic isotope production. It replaces the results of
previous attempts to determine the ratio of ^8He to ^9Li production that
yielded a wide range of limits from 0 to 30%. The results provide future
liquid-scintillator-based experiments with improved ability to predict
cosmogenic backgrounds.
