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  nuclear two-photon decay, Page 2 of 12  Not logged in ELOG logo
ID Date Author Categorydown Subject
  81   Sat May 8 21:10:24 2021 Michael, Ruijiu, Helmut, Yuri, Wolfram, Sergey, ShahabRunsstarted data taking with high resolution
after optimizing the scrapers we have reached the highest possible resolution in the isochronous mode.

starting data taking with this new settings.

last files before this settings were:

245: 2021.05.08.14.14.55.114.tiq
410: 2021.05.08.15.15.10.101.tiq
Attachment 1: E143-245MHz-2021.05.08.20.17.39.000.tiq.png
E143-245MHz-2021.05.08.20.17.39.000.tiq.png
Attachment 2: E143-410MHz-2021.05.08.21.18.51.447.tiq.png
E143-410MHz-2021.05.08.21.18.51.447.tiq.png
  82   Sat May 8 21:42:26 2021 AllRunsStop72Ge
  84   Sat May 8 22:06:36 2021 Michael, Ruijiu, Helmut, Yuri, Wolfram, Sergey, ShahabRunsstopped data taking with the high resolution
last file names with this setting:

245: 2021.05.08.20.42.03.743.tiq
410: 2021.05.08.21.42.17.969.tiq
  87   Sun May 9 02:19:04 2021 Jacobus, ShahabRunsFirst 52Mn run
Run E143-245 MHz-2021.05.09.01.17.42.265.tiq is the first run of the experiment on 52Mn.
  88   Sun May 9 02:32:58 2021 Jacobus, ShahabRunspossible 52-Mn isomer
the intensity of the line on the left side is so high, it is difficult to see the isomers in the middle as can be seen in the auto generated picture
Attachment 1: E143-245MHz-2021.05.09.01.23.19.468.tiq.png
E143-245MHz-2021.05.09.01.23.19.468.tiq.png
Attachment 2: asd.jpg
asd.jpg
  89   Sun May 9 02:45:50 2021 Jacobus, Michele, ShahabRunsExample of possible 52.Mn isomer
this is how it should look like
Attachment 1: 52Mn_002.PNG
52Mn_002.PNG
  90   Sun May 9 02:51:44 2021 IrisRunsExample of possible 52.Mn isomer
So the "isomers" pop up at ~-600 Hz and +580 Hz... is the -600 Hz on the left the 378 keV isomer (21 min) and the +580 Hz on the right the g.s.?
  91   Sun May 9 03:24:12 2021 Iris (Shahab, Jacobus, Chris G., Michele)RunsExample of possible 52.Mn isomer
Short update from Yuri: these are not our isomers. These are 45Sc (left, 12 keV isomer not resolvable) and 75Br (center), and the right-most peak of the triplet is a satellite (has a different line shape, much narrower).




> So the "isomers" pop up at ~-600 Hz and +580 Hz... is the -600 Hz on the left the 378 keV isomer (21 min) and the +580 Hz on the right the g.s.?
  92   Sun May 9 04:15:50 2021 Michele, Jacobus, ShahabRunsBeam issues for short duration
ESR warning (colour red in the panel)

Operator intervention required. 

Runs affected by this issue: 

-from E143-245MHz-2021.05.09.02.49.48.521 (03:50) 
-to E143-245MHz-2021.05.09.02.54.54.239 (03:54) .  



  
  93   Sun May 9 05:11:55 2021 Iris (Chris G., Jacobus, Michele)RunsFirst 52Mn run (no 52Mn unfortunately)
> Run E143-245 MHz-2021.05.09.01.17.42.265.tiq is the first run of the experiment on 52Mn.


And Run E143-410MHz-2021.05.09.03.27.37.368.tiq	from 2021-05-09 03:27 is the first run on the 410 MHz detector. Started a bit later than the 245 MHz detector.
 
  98   Sun May 9 06:15:09 2021 Iris, Chris G., Jacobus, MicheleRunsTriplet: zoom in
Zoom into the triplet: the satellite peaks on the right are clearly visible.
This is just one file but one *might* see some substructure. Yuri mentioned a 318 ms isomer in 45Sc at 12 keV but that cannot be resolved.

Maybe someone can look at the added-up ROOT files if that looks better or is just statistics?

> Short update from Yuri: these are not our isomers. These are 45Sc (left, 12 keV isomer not resolvable) and 75Br (center), and the right-most peak of the triplet is a satellite (has a different line shape, much narrower).
> 
Attachment 1: 116-triplet.png
116-triplet.png
  104   Sun May 9 13:15:38 2021 Liliana AndrewRunsStopped data taking during modifications for the beam energy
Beam energy to be increase to move Mn into the ring. 
First step we set the energy to 445 MeV. 
The effect of the change can be seen on the plot: Right is how it was before and left after the change. 
Attachment 1: Screenshot_2021-05-09_13-25-26.png
Screenshot_2021-05-09_13-25-26.png
  107   Sun May 9 16:19:06 2021 Rodostina, Oliver, Wolfram, ShahabRunsSetting to 52Mn ????
first filename in this recording:

E143-245MHz-2021.05.09.15.16.49.816.tiq
  109   Sun May 9 18:41:33 2021 Rodostina, Oliver, Wolfram, Helmut, Yuri, ShahabRunsstopped data taking for energy change
last recorded filename:

E143-245MHz-2021.05.09.17.38.44.410.tiq

410 was not recording data in this period.
  111   Sun May 9 19:03:02 2021 Rodostina, Oliver, Wolfram, Helmut, Yuri, ShahabRunsquadrupoles were down, fixed.
  113   Sun May 9 20:39:17 2021 ShahabRunsSubtracting the background
still in the search of 70-Se
Attachment 1: spectrum_subtraction.png
spectrum_subtraction.png
  117   Sun May 9 23:28:25 2021 Kanika, Alex, Wolfram, Helmut, ShahabRunsreturn with the Ge setting of the last night
starting filenames:

E143-410MHz-2021.05.09.23.28.24.018.tiq

E143-245MHz-2021.05.09.22.28.12.904.tiq
  129   Mon May 10 06:16:31 2021 Kanika, Alex, ShahabRunsRecording broad band spectra with 410
doing some broadband spectra recording with the 410 MHz detector, for the purpose of future confirmation of identification lines.
  131   Mon May 10 06:35:58 2021 Kanika, Alex, ShahabRunsgoing back to shot by shot recording with 410 detector
going back to shot by shot recording with 410 detector
  140   Tue Jun 29 21:10:30 2021 ShahabRuns72-Ge setting
the new setting is roughly 400 khz lower in frequency.
Previous beam time Ge was on 243.100 now it is on 242.74

we decided to use the higher harmonic:

expecting it on 244.66 MHz
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