sFGD beam test analysis

Thursday 7 Jan 2021, 17:00 → 19:00 Europe/Zurich

 

https://stonybrook.zoom.us/j/7598419716?pwd=QmIyT0hwWkxkVWJwQnhmbDR6NVo1QT09

pass: letmein

 

17:00 → 17:20 Invisible scattering udpate

Speaker: Perri Zilberman

Neutron Invisible Scattering Update 1-7-21.pdf

17:20 → 17:40 LANL2020 high-angle scattering data

Speaker: Guang Yang (Stony Brook University)

LANL_highAngle_Jan6_2021.pdf

17:40 → 18:00 LANL 2020 3.6 us spacing data

Speakers: Shih-Kai Lin, Shih-Kai Lin (Louisiana State University)

20210107_Shih-Kai.pdf

18:00 → 18:10 Meeting Minutes

Speaker: Dr Ciro Riccio (Stony Brook University (US))

Attendees: Guang Yang (GY), Ciro  Riccio (CR), Chang Kee Jung (CKJ), Perri Zilberman (PZ), Abraham Teklu (AT), Alex Ramirez (AR), Andriaseta Sitraka (AS), Eric Chong (EC), Ki-Young Jung (KYJ), Shih-Kai Lin (SL), Sunwoo Gwon (SG), Christopher Mauger (CM), Mikhail Danilov (MD)

 

Perri Zilberman - Invisible scattering updates

 

• CKJ: Slide 8: did you do ref - case or case - ref. Perri: this is an absolute value, will change
• CKJ: Slide 10: we need to understand the spread across the depth  GY: I had this before I might have a summary of the invisible scattering next week
• CKJ: Slide 10: Can we separate out the elastic and inelastic components and see how a change in the fraction of those components will change the distribution? GY: it is hard to do firstly, then even if we do, we may not have a good model to describe what we see
• CKJ: Slide 10: No matter what you use, you have at most 20% discrepancy, it is not too bad actually..

 

Guang Yang - LANL2020 high-angle scattering data

 

• CKJ: Slide 4: 1 cm is actually 0.7 cm? GY: You are right. I will fix this typo.
• CM: Slide 6: Did you put some criteria on the relative timing between SFGD and US-JP? GY: Not here yet, but the plan is to include it.
• CM: There are two things we can do. One is use the timing in SFGD to set a lower limit for the beam incident neutron and see if we can get the incident neutron energy with the two body interaction in US-Japan. The other thing is to use either the long proton/pion track or cosmics to see the connection between the two detectors in time and in space. GY: Yep, good ideas.
• CM: Slide 7: This can be related to beam as well. GY: Correct. CM: We must make sure that this is not coming from the halo of the beam. GY: I looked at simulation to understand this. CKJ: You can look at events with a z-depth larger than US-JP.
• GY: Slide 11: Probably a bug in the way costheta is calculated.
• CM: Slide 12: Is the angle fixed? GY: It is changing. The bug mentioned above is affecting also these plots.
• CR: What is the distance between SFGD and US-JP. GY: Distance between SFGD and US-JP is 34 cm.

 

Shih-Kai Lin - LANL 2020 3.6 us spacing data

 

• GY: Slide 10: I guess you are considering both detector at the same time. With a cut on the FEB number you can select SFGD or US-JP.
• CKJ: I don't understand how you can remove wrap-around using hit-level informations. SKL: The wrap-around neutrons occupy the low energy region and the hit thy leave can be different from the other neutrons. CKJ: My concern is that you can introduce bias using this kind of cut.
• CKJ: First order there are no problems in this data taking.