Study of neutron flux Number of neutron from

Study of neutron flux

Number of neutron from E 566 data • Run 310～ 320 (Run 313 junk) @ (π+, K+) trigger • Run 140～ 543 @ Beam trigger • All sum of single Ge ADC spectrum • W/o Timing gate • Ge live time 0. 55 • DAQ live time 0. 84

+ (π , + K) trigger

ADC spectrum w/o TDC timing gate (Single ADC sum) ピーク数 (3. 40± 0. 07)× 104 個 →(2. 83± 0. 06)× 103 個/Ge (12 single Ge worked)

Neutron 数 : Run 310～ 320 • (中性子数/Ge) = (1. 21± 0. 02)× 105 • (π+, K+) trigger : 6. 63× 106 • π+ ビーム数 : 3. 36× 1010 • (中性子数/(π+, K+) /Ge) = (1. 83± 0. 04)× 10 -2 ⇒(w/ Dead time) = (4. 16± 0. 09)× 10 -2 (Ge 0. 55, DAQ 0. 84) 総π+ ビーム 1. 3× 1012 ⇒(5. 41± 0. 09)× 1010 /Ge

Beam trigger

ADC spectrum w/o TDC timing gate (Single ADC sum) ピーク数 (2. 31± 0. 22)× 103 個 → 193± 18 個/Ge (12 single Ge worked)

Neutron 数 : Run 140～ 534 • (中性子数/Ge) = (8. 27± 0. 77)× 103 • π+ ビーム数 : 1. 24× 1012 • Prescale factor 5. 0× 105 • (中性子数/Ge) = (4. 14± 0. 39)× 109 • (中性子数/π+/Ge) = (3. 34± 0. 31)× 10 -3 ⇒(w/ Dead time) = (7. 59± 0. 70)× 10 -3 Ge 0. 55, DAQ 0. 84 総π+ ビーム 1. 3× 1012 ⇒(9. 87± 0. 91)× 109 /Ge