 Sun Sep 15 21:15:48 2024, CLW, Amplitude spectra 
|
Strip 13 ampltiude spectra for the LiF and B samples. Also a picture of a simulation of what would be expected in a 20 um detector in terms of energy
deposition for several reactions (assuming a thin sample).
- for B-10 n,alpha, the dominant reaction is n,alpha_1, so just seeing one peak makes sense |
|
Wed Sep 18 09:24:48 2024, CLW, run219173
|
Strips 1-16 dE.
Strip 8 is not working. Strip 16 is drowing the 10B peak in noise. All others look ok. The low energy peak around channel 300 in
visible in some strips may be the Li recoil. The main peak around channel 800 is 10B(n,alpha_1) at around 1.3 MeV. The alpha_0 channel should be at around |
|
Wed Sep 18 10:08:58 2024, CLW, Quick Plotting in terminal directly from root file
|
root -l run219167.root
TH1F *h=new TH1F("h","h",5000,0,5000)
EDET->Draw("amp>>h","detn==7") |
|
Fri Sep 20 09:19:35 2024, CLW, Photos of Setup
|
| Photos |
|
Fri Sep 20 09:58:28 2024, CLW, K-40 run219189
|
Plot shows deposited energy (very rough calibration) vs Neutron energy (also very rough calibration). We expect the biggest resonances in the 40K(n,alpha)
reaction at ~1 keV and 5 keV. There is an accumulation of counts at those neutron energies and around the expected Alpha energy (~3.5 MeV and ~1.8 MeV).
In the proposal we expected in total ~2000 counts for those resonances for 4.5E18 protons. The plot shows 1/200 of the total statistics, so what |
|
Fri Sep 27 15:51:30 2024, CLW, Runplan for last ~week of run: UNDER CONSTRUCTION
|
- run with LiF for a few hours with filters in the beam -- > this will help with the neutron energy calibration later
- run again LiF and 10B (not all samples, 2 LiF and 1 B are enough)
- run with the dummy sample |