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30 May 2022 to 4 June 2022
Virtual Seoul
Asia/Seoul timezone

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

Not scheduled
5m
Virtual Seoul

Virtual Seoul

Poster Other Poster

Speaker

Hyungi Lee (Seoul National University)

Description

We report the measured production rates of unstable isotopes 9Li and 8He produced by cosmic muon spallation on 12C using two identical detectors of the RENO experiment. Their β-decays accompanied by a neutron make a serious contribution to backgrounds of the inverse beta decay 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 3100 days of data, the cosmogenic production rate of 9Li(8He) 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 9Li (8He), 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 10−8μ−1g−1cm2. Combining the measured 9Li 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 = 0.76 ± 0.05.

Collaboration RENO collaboration

Primary author

Hyungi Lee (Seoul National University)

Co-authors

Dr Byeongsu YANG (Department of Physics and Astronomy, Seoul National University) Dr Changdong SHIN (Department of Physics, Chonnam National University) Ms Daeun JUNG (Department of Physics, Sungkyunkwan University) Dr Dongha LEE (Department of Physics and Astronomy, Seoul National University) Mr Dongho MOON (Department of Physics, Chonnam National University) Dr Eunhyang KWON (Department of Physics, Sungkyunkwan University) Prof. Hanil JANG (Department of Fire Safety, Seoyeong University) Dr Hyunkwan SEO (Department of Physics and Astronomy, Seoul National University) Prof. Intae YU (Department of Physics, Sungkyunkwan University) Prof. Intaek LIM (Department of Physics Education, Chonnam National University) Prof. Jaeyool KIM (Department of Physics, Chonnam National University) Dr Jeeseung JANG (GIST College, Gwangju Institute of Science and Technology) Dr Jiwoong SEO (Department of Physics, Sungkyunkwan University) Mr Jonggun KIM (Department of Physics, Sungkyunkwan University) Prof. Jonghee Yoo (Department of Physics and Astronomy, Seoul National University) Mr Juneho CHOI (Department of Radiology, Dongshin University) Prof. Kyungkwang JOO (Department of Physics, Chonnam National University) Prof. Myoung Youl PAC (Department of Radiology, Dongshin University) Dr Ryeonggoon Park (Department of Physics, Chonnam National University) Mr Sang yong KIM (Department of Physics and Astronomy, Seoul National University) Mr Seok-Gyeong YOON (Department of Physics, Korea Advanced Institute of Science and Technology) Prof. Soo-Bong KIM (Department of Physics, Sungkyunkwan University) Prof. Wooyoung KIM (Department of Physics, Kyungpook National University)

Presentation Materials