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Fixed, , Fri Feb 15 15:31:28 2019, Marlène, GRIT, General, N/A, Detectors bias
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, e775s, Fri Feb 28 13:58:31 2020, Marlène, , , ,
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Fixed, e768s, Sat Jul 20 19:21:56 2019, Marlene, Nicolas, Christian, Fairouz, OFFLINE, General, , Trying to understand AGATA g-ray yields
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goal: we want to check whether the yields of the 1297.7 keV (from 19Ne 1536, 3/2+, l=1 state) and 1340 keV (from 19Ne 1615, 3/2-, l=2 state) g-ray lines is compatible with what we expect from x-sec calculations
conditions: we consider runs 112, 115 and 116
observations:
N(1297) = 17 g-rays
N(1340) = 23 g-rays
remarks:
Given x-sec from mirror nucleus (Francois 15N(7Limt) paper) we expect N(1340) >~ N(1297)
ingredients:
1. beam normalization
We use the TAC_FPMW_HF as a proxy. During the same time we integrate the prompt peak and compare the integrated OR VAMOS scaler, we find Scaler(OR VAMOS)/N(TAC) = 193.
We use the comparison of the OR VAMOS (pps) and the beam profiler (pps), we find profiler/OR VAMOS = 1e4
We obtain (2.17e5 + 6.44e4 + 3.52e5)*193*1e4 = 1.2 e12 15O incident particles (at profiler position!)
2. target thickness -> known to be 1.25 mg/cm2 of LiF (RBS measurement)
N(Li) = 1.25e-3 / (19+7) * 6.02e23 at/cm2
3.efficiencies
AGATA @ 1.3 MeV -> 7.5 %
VAMOS intrinsic -> 67 % (Eff_Check.C macro applied to run 116)
MUGAST -> 50 % (lab, geometry), needed because MUGAST is the main trigger
4. 19Ne charge state
we assume 40 % for 9+
5. g-ray branching ratio -> taken from NNDC
6. cross-section
we calculate differential cross section for the 1536-keV 19Ne state (FRESCO, FR-DWBA)
-> at 0 deg, ds/dW =
-> integrated x-sec in VAMOS acceptance (4 deg (lab) -> 20 deg (cm)) = 445 micro barn (C2Sa = 1)
-> taking into account know spectroscopic factor form analog state -> 89 micro barn
Conclusion:
for the 1536-keV 19Ne state we obtain 30 g-rays, instead of 17.
Discussion:
This factor of two could be well within the mirror symmetry assumption. However it seems it is also the case for the 1615-keV 19Ne state, so would not it be a systematic error with a factor of two missing somewhere (beam transmission between the profiler and the target? deficiencies?)? |
Fixed, com2019, Sat Apr 6 12:38:17 2019, Marlene et Valerian, RUN, General, CD2, Tac Si Vamos with gate on GATCONFMASTER > 8 
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Fixed, , Tue Apr 9 21:47:20 2019, Marlene Valerian, GRIT, General, , FSC time calibration 9th april evening
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Snapshot of FSC calibration just before experiment
The noisy MG detectors are still there but otherwise most of them are OK |
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Fixed, , Thu Feb 14 15:30:14 2019, Marlene Daniele Jenny, GRIT, General, 3-alpha, RUN 28
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RUN 28 14th Feb
3 alpha source on MG11A, MG3T, MG1T
GMT channels
MG11
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MG3
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MG1
- |
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Fixed, , Thu Feb 14 08:50:58 2019, Marlene, GRIT, General, 3-alpha, RUN 27 8x
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RUN 27 on 14th of feb.
3 alpha source (one in front of trap., one in front of square detectors)
MG10, MG4, MG7 and MG5 are OK.
MG1 shows alpha but at lower energy and with bad resolution (particularly on X). We suspect it is not well depleted. We tried to increase the bias up to 200V but did not see any change.
It is due to a non working SA/SL external cable that produces this error (we tested it with several detectors, we also tried to change the MUVI channel and it still does the same)
Conclusion :
We have tested all trapezoid detectors (MG1, MG3, MG4, MG5, MG7) the annular (MG11) and the thin square (MG10) they are all OK
Detectors (order in the GMT) :
MG10
MG1
MG4
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MG7
MG5
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attached : bias of detectors ( be careful : MG10 bias = MG11A)
spectra for all detectors |
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Fixed, com2019, Mon Feb 18 10:41:36 2019, Marlene, GRIT, General, N/A, Bias & current of detectors
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Fixed, , Mon Mar 4 17:22:29 2019, Marlene, GRIT, General, , Temperature on MUFEE MUST2 13deg 8x
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Temperature given by DAS on MUVI3 (MUST2)
screenshots before run
after run : same values |
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Fixed, TEST, Thu Mar 7 09:29:47 2019, Marlene, GRIT, General, , run 96 double alpha source run shifted 60mm
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RUN 96
double alpha source
MG1
MG3
MG4
MG5
MG7
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MG11
MM1
MM2
MM3
MM4
Missing strips in Y the same as in run 40
Problem with the annular MG11 -> no current when bias is put... --> to be checked
Problem with the insertion of the target holder --> solved
I also checked again MG9 (still noisy)
and MG10 with 140V I=0,52uA and counting rate is the same order of magnitude as trapezoid. Spectra are OK (not saved). |
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Fixed, TEST, Sun Feb 23 22:17:49 2020, Marlene, RUN, Hardware, , tracetek error
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When filling the coolers with alcohol the tracetek cable triggered and switched off water and supplies.
Beam is off |
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Fixed, e744s, Sat Apr 13 15:25:56 2019, Marion, Kseniia, Dieter, Didier, Guiseppe, IuliaH, Catalin, ONLINE, General, CH2, Scalers v8 for run122.1
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| "1_" added to screenshot filenames to indicate automatic file opening |
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Fixed, e744s, Sat Apr 13 15:31:32 2019, Marion, Kseniia, Dieter, Didier, Guiseppe, IuliaH, Catalin, ONLINE, Social, CH2, Screenshots run 122.1 v6 20x
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| "1_" added to screenshot filenames to indicate automatic file opening |
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Fixed, e744s, Sat Apr 13 11:42:16 2019, Marion, Kseniia, Dieter, Didier, Guiseppe, IuliaH, ONLINE, Social, CH2, Screenshots - spectra zeroed after previous screenshot taking 20x
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| spectra zeroed after previous screenshot taking |
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Fixed, e744s, Sat Apr 13 11:44:21 2019, Marion, Kseniia, Dieter, Didier, Guiseppe, IuliaH, BEAM, General, CH2, tempory beam interruption
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ventilation problem SPIRAL& - beam stopped for presumably appro. 10 min (PCP info)
beam is back at 11:52 h |
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Fixed, e744s, Sat Apr 13 12:32:03 2019, Marion, Kseniia, Dieter, Didier, Guiseppe, IuliaH, ONLINE, General, CH2, Scalers
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Fixed, e744s, Sat Apr 13 13:13:18 2019, Marion, Kseniia, Dieter, Didier, Guiseppe, IuliaH, ONLINE, Social, CH2, Screenshots run 122 v5 20x
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Fixed, e744s, Sat Apr 13 13:42:22 2019, Marion, Kseniia, Dieter, Didier, Guiseppe, IuliaH, RUN, General, CH2, New run 122...1 generated after 4G on disk
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Fixed, e744s, Sat Apr 13 13:58:08 2019, Marion, Kseniia, Dieter, Didier, Guiseppe, IuliaH, BEAM, Hardware, CH2, beam rate (read from CATS) as a function of time
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Fixed, e744s, Sat Apr 13 14:19:41 2019, Marion, Kseniia, Dieter, Didier, Guiseppe, IuliaH, ONLINE, General, CH2, Scalers
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