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:

Sat Nov 5 15:07:11 2016

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62Ni on 6 mm C target between MUSICs

The background before was 0.36 neutrons/s
Now it is around 10 n/s
With 3100 counts/s at F3 we have of the order of 25 neutrons/s
There is an slightly higher than 10 factor between the rate of 
the plastic top and bottom (13 cts/s vs 1ct/s).
Rate at F11 (plastic) 900 cts/s.

We start a proper measurement with DLT
Reset Timestamp

They will measure with 6mm C target (between MUSICS) for 
about 45 minutes and then 15 min without target.
CH2 target at F7 is OUT (beam going directly to F11).

DLT: 161106_0026_62Ni_F11_C6mm_000
Run: 000

Start: 00:27
Stop: 01:17
tlife=3007 s

At 00:37
Rate at F3: 3000 cps
Rate at F11: 900 cps
Rate at BRIKEN: 25 n/s
Rate at VPLT:13 cps
Rate at VPLB: 0.8 cps

Root File: 161106_0117_62Ni_F11_C6mm.root

Figure with rates: F11 (black), BRIKEN (red), Clovers (green)
V_PL_T (blue), V_PL_B (pink)

Figure with F11 spectra: Right (red), Left (blue)

Figure with time correlation between F11 and BRIKEN
The number of correlations (integrated spectrum minus flat background)
is 73063 very close the number of detected neutrons 73899
The difference 833 agrees well with the expected number of background
neutrons. That is: for every neutron detected in BRIKEN there was an 
ion passing through F11 (!?).
There is a funny double structure in the first 20 microsec.
94% of the neutrons are detected within 200microsec

Figure with the spectra of Veto plastics Top (red) and
bottom (blue). There are 7.5 times more counts in T than in B.
One can see in the Top peaks at 3MeV and 12MeV 
(corrected from 6 and 25 MeV: wrong calibration!!)
and show signals up to very high energy (GeV)

Figure with the time correlation between Veto Plastics and BRIKEN
Top (red) Bottom (blue). There is a time correlation with Top veto plastic
for 15% of the neutrons in BRIKEN (11440). There  are 18 times less 
correlations with the Bottom plastic. 
WARNING: The correlation was done for signals above "20MeV"
in the V_PL_T spectra i.e. only including the second bump"

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