Development of the experiment on first observation of elastic - - PowerPoint PPT Presentation

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Development of the experiment on first observation of elastic - - PowerPoint PPT Presentation

Feb 17, 2023 246 likes •395 views

Development of the experiment on first observation of elastic coherent neutrino-nucleus scattering with liquid argon Rudik Dmitrii Gennadyevich SSC RF ITEP OF NRC "KURCHATOV INSTITUTE, MEPhI RED coll., COHERENT coll. 10.10.16

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Development of the experiment on first observation of elastic coherent neutrino-nucleus scattering with liquid argon

Rudik Dmitrii Gennadyevich SSC RF ITEP OF NRC "KURCHATOV INSTITUTE”, MEPhI RED coll., COHERENT coll.

10.10.16 ICPPA-2016 Rudik Dmitrii 1

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Plan

  • Motivation
  • Coherent elastic neutrino-nucleus scattering (CEvNS)
  • Benefits of different working substances usage for CEvNS registration
  • LAr detector for CEvNS registration: CENNS-10
  • ITEP Test Chamber
  • Investigation of different type of WLS
  • NOL, TPB
  • Volume-distributed WLS (Xe-dopant)
  • Conclusion

10.10.16 ICPPA-2016 Rudik Dmitrii 2

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SLIDE 3

,k ,k’ q

Neutral current

+ + + +

,k ,k’ q

Neutral current

+ + + + + + + +

Motivation

  • CEvNS is predicted by

Standard Model, but still no experimental observation

  • A lot of groups working on

this problem all over the world

  • Different type of detecting

substance allow to determine parameters of this process

10.10.16 ICPPA-2016 Rudik Dmitrii 3

IEEE TRANSACTIONS ON NUCLEAR SCIENCE, VOL. 50, NO. 5, OCTOBER 2003

  • P. S. Barbeau, J. I. Collar, J. Miyamoto, and I. Shipsey
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Motivation CENNS-10

  • CENNS-10 is LAr detector

made by IU group @ SNS, Oak Ridge, USA

  • Two PMTs: R5912
  • Current WLS technology:

acrylic + tetraphenyl butadiene (TPB)

  • Upgrading… New WLS

techiques?

10.10.16 ICPPA-2016 Rudik Dmitrii 4

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SLIDE 5

ITEP Test chamber

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Vacuum

  • r N2

PMT LAr sample LN2 bath Thermocontrol

Gas

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ITEP Test Chamber & scheme of measurements

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ORTEC 927 Base ORTEC 570 Amplifier Multichannel analyser PMT LAr diam 35 mm 33.3 mm 30 mm PMT FEU-181 MELZ (Moscow) VUV-sensitive: MgF2 window multialkali photocathod Can operate at cold (down to LN2 temp.) diam 22 mm WLS

α source

241Am

Digital

  • scilloscope

(1 GHz)

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SLIDE 7

emission absorption

λ, nm k, l·mol–1 ·cm–1 PMT FEU-181 (Russia) Photocathode – S20 NOL1: T-Ph-Ph-T (Т-thiophene; Рh-phenyl) S3~190 nm S2~270 nm S1~350 nm

NOL & TPB investigation

  • Enikolopov inst. developed new

type of WLS called “Nanostructured organosilicon luminophore” (NOL)

  • T. Yu. Starikova et al J. Mater.
  • Chem. C, 2016,4, 4699-4708
  • NOL has several types with

different absorption spectrum

  • A lot of measurements have

already been done, but…

  • We need some additional tests

(first of all comparing test with TPB) before presenting our results

10.10.16 ICPPA-2016 Rudik Dmitrii 7

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Volume-distributed WLS

  • Xe-dopant in LAr

works like distributed WLS

  • O. Cheshnovsky, B. Raz,
  • J. Jortner,
  • J. Chem. Phys. 57

(1972) 4628.

  • The amount of

collected light increasing with Xe concentration

  • A. Neumeier, et al., Nucl. Instrum. Meth.

A 800, 70-81 (2015)

  • Two Xe dopants:
  • 14+5-3 ppmv
  • 24+9-5 ppmv
  • For 14 ppmv mixture one can obtain 4

times more light then for pure Ar

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diam 22 mm

FS

14 14 14

92.7 K 90 K 84.5 K 84.5 K 85 K 85 K

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Volume-distributed WLS

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  • Still can distinguish fast and

slow components!

  • Light output from Ar to Xe

depends on Xe concentration

  • Mixture is stable! In long run

(for 24 ppmv mixture): 32 hours of continuous running with average temperature ~86К (practically stable) (Xe melting point is 161,3 К)

“Pure” LAr LAr + Xe (14 ppmv) LAr + Xe (24 ppmv) “Pure” LAr LAr + Xe (14 ppmv) LAr + Xe (24 ppmv) New pure LAr All lines – LAr + Xe (24 ppmv) 9 different run times during long run

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Conclusion

  • We are conducting R&D on different types of WLS for LAr detectors
  • Different characteristics of volume-distributed WLS (Xe-doping) were

experimentally investigated

  • We have shown stability of LAr+Xe mixture and possibility of usage

this type of WLS

  • A lot of things in our ToDo list:
  • NOL & TPB tests
  • Further LAr+Xe investigation (Precise concentration, gamma-source…)

10.10.16 ICPPA-2016 Rudik Dmitrii 10

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SLIDE 11

This work was supported by RFBR grant:

16 16-32 32-00691 00691 мол_а _а «My first grant»

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Thank you for your attention!

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NOL-results

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LXe LAr NO WLS NOL-3a, min. glass NOL-1 FS glass No data for LXe.