ELOG BRIKEN

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

BRIKEN

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Entry time:	Mon Mar 31 13:11:32 2025
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> Measurement overnight > > Start: around 1:00 > Stop: 9:35 > File: 161105_0935_BackgroundOvernight.root > > The background level after removing the 252Cf source > from the hall dropped to 0.4n/s. > > During the night there were neutron rates up to 120 n/s (see figure) > > There is a huge spike in the rates which coincides with the time of > LN2 filling. One can see spike in several spectra (not in all) > One can see also a structure superposed > > The rate per rings is also shown. The outer rings see > a higher rate. > > Also shown is the comparison of He107 one (blue) of the outer ORNL2 tubes > with He084 one (red) of the inner ORLN2. The increase in count rate > is about 30%. > > Also shown is the comparison of two external tubes on the top and the bottom: > He107 (blue) and He137 (red), ORNL2 tubes. There is no increase in count rate. > > Also shown is the comparison of a tube above the lead shielding He028 (blue) > and behind the lead shielding He048 (red), UPC tubes. There is no difference. > > There is also comparison between the rate in the CLOVERS and BRIKEN. > Without beam the rate in the Clovers is around 100 g/s against 0.4 n/s in BRIKEN > At the maximum both rates are similar around 130 c/s. > > There is also a plot of the gamma-neutron correlation. > We see that there are neutrons which are detected before > the gammas. A possible explanation several neutrons are produced > one is detected first the second later produces a gamma. Encoding: HTML ELCode plain Suppress Email notification

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