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 13:10:18 2025
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> Beam tuning in BigRIPS > > At 19:00 access to Exp. Area was closed and the tuning > of BigRips started. > > Unfortunately the 252Cf was left on the table close > to the stairs and cannot be removed until 23:00. > > We did a background measurement > Start: 19:00 > Stop: 22:18 > > File: 161104_2218_BeamTuning.root > > In the attached figure 1 one can see a plot of the rate > (neutrons/10s) in the BRIKEN detector during this time > The rate was at high as 150n/s during this period. > We estimate that the influence of the 252Cf source is about 15n/s > (corresponds to the lowest rates) > > Also attached are pictures of the Top and Bottom plastic veto detectors > mounted just above and below the hole in the shielding. > Interestingly the bottom sees less counts at high energy > and this could be related to the 10cm lead wall raised > before the degrader to protect AIDA that covers only partially > the top detector. > > Also attached is the neutron spectrum for the different rings superposed. > (ROOT color code)
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