AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
BRIKEN
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Mon Mar 31 13:09:22 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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