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Entry time:
Mon Mar 31 13:21:47 2025
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U: (Up: 2 RIKEN tubes at 40cm from AIDA) D: (Down: 12 RIKEN tubes at 80cm from AIDA) US: (2 ORNL 2" tubes close to the floor at 1.8m from AIDA) Natural background: File: 150426_Bckg_1425_1805.root Rate per tube (n/s): U=0.0071, D=0.0045, US=0.0222 Notes: -This rate seems quite small but we should remember that we are underground. -The fact that U is larger than D could be explained as related that the amount of PE around tubes is larger. -For comparison: BELEN-20@JYFL=0.6n/s (no beam), 0.9n/s (beam) BELEN-30@GSI=1.2n/s (beam) BELEN-48@JYFL=1.5n/s 110Zr setting: File:150501_16111810_110Zr.root Rate per tube (n/s): U=0.483, D=0.139, US=0.292 Ratio to background: U=68.3, D=31.1, US=13.2 Individual tube distribution: U1 0.280 D1 0.087 D7 0.084 US1 0.132 U2 0.249 D2 0.092 D8 0.084 US2 0.188 D3 0.083 D9 0.077 D4 0.075 D10 0.070 D5 0.073 D11 0.069 D6 0.065 D12 0.054 Notes: -There is huge increase of with beam -The drop of increase with distance is consistent with either beam induced or decay of implants 110Zr setting: File: 150501_1733_1900_110Zr.root (actually 02/05) Rate per tube (n/s): U=0.869, D=0.242, US=0.516 Ratio to 1st 110Zr: U=1.80, D=1.74, US=1.77 Notes: -We don't quite understand the reason for the near factor two difference since apparently the settings are the same and beam was rather stable In order to investigate the point of origin of the neutrons we add extra PE covering D5,D6,D11,D12 from the top and D1,D2,D7,D8 from the front 88Ge setting: File: 150502_21502333_88Ge.root Rate per tube (n/s): U=1.271, D=0.349, US=0.706 Ratio to 1st 110Zr: U=2.63, D=2.51, US=2.42 Individual rates: U1 1.340 D1 0.424 D7 0.402 US1 0.576 U2 1.202 D2 0.446 D8 0.381 US2 0.835 D3 0.408 D9 0.342 D4 0.393 D10 0.315 D5 0.359 D11 0.250 D6 0.275 D12 0.193 Notes: -One notices a relative drop of rate for D6, D11 and D12 pointing to a source located in the vicinity of AIDA 94Se setting: File: 150503_1219_1319_94Se.root Rate per tube (n/s): U=1.267, D=0.349, US=0.717 Ratio to 1st 110Zr: U=2.62, D=2.51, US=2.46 Notes: -Very similar to 88Ge measurement
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