Measurement of cosmogenic Li 9 and He 8 production rates at RENO

H. G. Lee; J. H. Choi; H. I. Jang; J. S. Jang; S. H. Jeon; K. K. Joo; D. E. Jung; J. G. Kim; J. H. Kim; J. Y. Kim; S. B. Kim; S. Y. Kim; W. Kim; E. Kwon; D. H. Lee; W. J. Lee; I. T. Lim; D. H. Moon; M. Y. Pac; J. S. Park; R. G. Park; H. Seo; J. W. Seo; C. D. Shin; B. S. Yang; J. Yoo; S. G. Yoon; I. S. Yeo; I. Yu

doi:10.1103/PhysRevD.106.012005

Measurement of cosmogenic Li 9 and He 8 production rates at RENO

H. G. Lee, J. H. Choi, H. I. Jang, J. S. Jang, S. H. Jeon, K. K. Joo, D. E. Jung, J. G. Kim, J. H. Kim, J. Y. Kim, S. B. Kim, S. Y. Kim, W. Kim, E. Kwon, D. H. Lee, W. J. Lee, I. T. Lim, D. H. Moon, M. Y. Pac, J. S. ParkR. G. Park, H. Seo, J. W. Seo, C. D. Shin, B. S. Yang, J. Yoo, S. G. Yoon, I. S. Yeo, I. Yu

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Abstract

We report the measured production rates of unstable isotopes Li9 and He8 produced by cosmic muon spallation on C12 using two identical detectors of the RENO experiment. Their β decays accompanied by a neutron make a significant contribution to backgrounds of reactor antineutrino events in precise determination of the smallest neutrino mixing angle. The mean muon energy of its near (far) detector with an overburden of 120 (450) m.w.e. is estimated as 33.1±2.3(73.6±4.4) GeV. Based on roughly 3100 days of data, the cosmogenic production rate of Li9(He8) isotope is measured to be 44.2±3.1(10.6±7.4) per day at near detector and 10.0±1.1(2.1±1.5) per day at far detector. This corresponds to yields of Li9(He8), 4.80±0.36(1.15±0.81) and 9.9±1.1(2.1±1.5) at near and far detectors, respectively, in a unit of 10-8 μ-1 g-1 cm2. Combining the measured Li9 yields with other available underground measurements, an excellent power-law relationship of the yield with respect to the mean muon energy is found to have an exponent of α=0.75±0.05.

Original language	English
Article number	012005
Journal	Physical Review D
Volume	106
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.106.012005
State	Published - 1 Jul 2022

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10.1103/PhysRevD.106.012005

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Lee, H. G., Choi, J. H., Jang, H. I., Jang, J. S., Jeon, S. H., Joo, K. K., Jung, D. E., Kim, J. G., Kim, J. H., Kim, J. Y., Kim, S. B., Kim, S. Y., Kim, W., Kwon, E., Lee, D. H., Lee, W. J., Lim, I. T., Moon, D. H., Pac, M. Y., ... Yu, I. (2022). Measurement of cosmogenic Li 9 and He 8 production rates at RENO. Physical Review D, 106(1), Article 012005. https://doi.org/10.1103/PhysRevD.106.012005

@article{79bd6b4f8eaf4e56b13225897cb4e20f,

title = "Measurement of cosmogenic Li 9 and He 8 production rates at RENO",

abstract = "We report the measured production rates of unstable isotopes Li9 and He8 produced by cosmic muon spallation on C12 using two identical detectors of the RENO experiment. Their β decays accompanied by a neutron make a significant contribution to backgrounds of reactor antineutrino events in precise determination of the smallest neutrino mixing angle. The mean muon energy of its near (far) detector with an overburden of 120 (450) m.w.e. is estimated as 33.1±2.3(73.6±4.4) GeV. Based on roughly 3100 days of data, the cosmogenic production rate of Li9(He8) isotope is measured to be 44.2±3.1(10.6±7.4) per day at near detector and 10.0±1.1(2.1±1.5) per day at far detector. This corresponds to yields of Li9(He8), 4.80±0.36(1.15±0.81) and 9.9±1.1(2.1±1.5) at near and far detectors, respectively, in a unit of 10-8 μ-1 g-1 cm2. Combining the measured Li9 yields with other available underground measurements, an excellent power-law relationship of the yield with respect to the mean muon energy is found to have an exponent of α=0.75±0.05.",

author = "Lee, {H. G.} and Choi, {J. H.} and Jang, {H. I.} and Jang, {J. S.} and Jeon, {S. H.} and Joo, {K. K.} and Jung, {D. E.} and Kim, {J. G.} and Kim, {J. H.} and Kim, {J. Y.} and Kim, {S. B.} and Kim, {S. Y.} and W. Kim and E. Kwon and Lee, {D. H.} and Lee, {W. J.} and Lim, {I. T.} and Moon, {D. H.} and Pac, {M. Y.} and Park, {J. S.} and Park, {R. G.} and H. Seo and Seo, {J. W.} and Shin, {C. D.} and Yang, {B. S.} and J. Yoo and Yoon, {S. G.} and Yeo, {I. S.} and I. Yu",

note = "Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

year = "2022",

month = jul,

day = "1",

doi = "10.1103/PhysRevD.106.012005",

language = "English",

volume = "106",

journal = "Physical Review D",

issn = "2470-0010",

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Lee, HG, Choi, JH, Jang, HI, Jang, JS, Jeon, SH, Joo, KK, Jung, DE, Kim, JG, Kim, JH, Kim, JY, Kim, SB, Kim, SY, Kim, W, Kwon, E, Lee, DH, Lee, WJ, Lim, IT, Moon, DH, Pac, MY, Park, JS, Park, RG, Seo, H, Seo, JW, Shin, CD, Yang, BS, Yoo, J, Yoon, SG, Yeo, IS & Yu, I 2022, 'Measurement of cosmogenic Li 9 and He 8 production rates at RENO', Physical Review D, vol. 106, no. 1, 012005. https://doi.org/10.1103/PhysRevD.106.012005

TY - JOUR

T1 - Measurement of cosmogenic Li 9 and He 8 production rates at RENO

AU - Lee, H. G.

AU - Choi, J. H.

AU - Jang, H. I.

AU - Jang, J. S.

AU - Jeon, S. H.

AU - Joo, K. K.

AU - Jung, D. E.

AU - Kim, J. G.

AU - Kim, J. H.

AU - Kim, J. Y.

AU - Kim, S. B.

AU - Kim, S. Y.

AU - Kim, W.

AU - Kwon, E.

AU - Lee, D. H.

AU - Lee, W. J.

AU - Lim, I. T.

AU - Moon, D. H.

AU - Pac, M. Y.

AU - Park, J. S.

AU - Park, R. G.

AU - Seo, H.

AU - Seo, J. W.

AU - Shin, C. D.

AU - Yang, B. S.

AU - Yoo, J.

AU - Yoon, S. G.

AU - Yeo, I. S.

AU - Yu, I.

PY - 2022/7/1

Y1 - 2022/7/1

N2 - We report the measured production rates of unstable isotopes Li9 and He8 produced by cosmic muon spallation on C12 using two identical detectors of the RENO experiment. Their β decays accompanied by a neutron make a significant contribution to backgrounds of reactor antineutrino events in precise determination of the smallest neutrino mixing angle. The mean muon energy of its near (far) detector with an overburden of 120 (450) m.w.e. is estimated as 33.1±2.3(73.6±4.4) GeV. Based on roughly 3100 days of data, the cosmogenic production rate of Li9(He8) isotope is measured to be 44.2±3.1(10.6±7.4) per day at near detector and 10.0±1.1(2.1±1.5) per day at far detector. This corresponds to yields of Li9(He8), 4.80±0.36(1.15±0.81) and 9.9±1.1(2.1±1.5) at near and far detectors, respectively, in a unit of 10-8 μ-1 g-1 cm2. Combining the measured Li9 yields with other available underground measurements, an excellent power-law relationship of the yield with respect to the mean muon energy is found to have an exponent of α=0.75±0.05.

AB - We report the measured production rates of unstable isotopes Li9 and He8 produced by cosmic muon spallation on C12 using two identical detectors of the RENO experiment. Their β decays accompanied by a neutron make a significant contribution to backgrounds of reactor antineutrino events in precise determination of the smallest neutrino mixing angle. The mean muon energy of its near (far) detector with an overburden of 120 (450) m.w.e. is estimated as 33.1±2.3(73.6±4.4) GeV. Based on roughly 3100 days of data, the cosmogenic production rate of Li9(He8) isotope is measured to be 44.2±3.1(10.6±7.4) per day at near detector and 10.0±1.1(2.1±1.5) per day at far detector. This corresponds to yields of Li9(He8), 4.80±0.36(1.15±0.81) and 9.9±1.1(2.1±1.5) at near and far detectors, respectively, in a unit of 10-8 μ-1 g-1 cm2. Combining the measured Li9 yields with other available underground measurements, an excellent power-law relationship of the yield with respect to the mean muon energy is found to have an exponent of α=0.75±0.05.

UR - http://www.scopus.com/inward/record.url?scp=85135933603&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.106.012005

DO - 10.1103/PhysRevD.106.012005

M3 - Article

AN - SCOPUS:85135933603

SN - 2470-0010

VL - 106

JO - Physical Review D

JF - Physical Review D

IS - 1

M1 - 012005

ER -

Measurement of cosmogenic Li 9 and He 8 production rates at RENO

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