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Kanno, K.; Aoki, K.; Arimizu, D.; Ashikaga, S.; Ebata, K.; Honda, R.; Ichikawa, M.; Kajikawa, S.; Kimura, Y.; Kondo, T.K.; Kyan, S.; Morino, Y.; Murakami, H.; Murakami, T.N.; Nakai, W.; Nakasuga, S.; Naruki, M.; Nonaka, T.; Noumi, H.; Ogata, N.; Ozawa, K.; Sako, H.; Sato, S.; Sekimoto, M.; Shirotori, K.; Takahashi, T.N.; Takaura, Y.; Tatsumi, R.; Tsukui, K.; Yahiro, K.; Yokkaichi, S.
Journal of instrumentation, 06/2023, Volume: 18, Issue: 6Journal Article
Abstract The J-PARC E16 experiment measures mass spectra of low-mass vector mesons, ρ , ω , and ϕ , in nuclei via e + e - decays. Vector mesons are produced in p A reactions. A spectrometer with a large acceptance and a high-intensity beam up to 1 × 10 10 protons per ∼2-sec duration pulse are utilized to collect a sufficient number of vector mesons. We have developed a spectrometer, which has two types of electron identification detectors: a hadron blind detector (HBD) and a lead-glass calorimeter. Commissioning runs have been performed at the J-PARC high-momentum beam line. The HBD successfully observed on average 11 ± 1 photoelectrons for an incident electron. We achieved the pion rejection of 0.9 ± 0.2% with the electron detection efficiency of 61 ± 4% for the HBD, which was consistent of the expected performance.
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