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Yury Gurchin June 2011

Yury Gurchin June 2011. MEASUREMENT OF THE CROSS-SECTION IN DP-ELASTIC SCATTERING AT THE ENERGIES OF 500 AND 880 MEV AT NUCLOTRON. DSS project.

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Yury Gurchin June 2011

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  1. Yury GurchinJune 2011 MEASUREMENT OF THE CROSS-SECTION IN DP-ELASTIC SCATTERING AT THE ENERGIES OF 500 AND 880 MEV AT NUCLOTRON

  2. DSS project The main aim of present investigation is to measure the cross-section of dp-elastic scattering at the energies of 500 and 880 MeV using kinematical coincidences of deuteron and proton with simple plastic scintillation counters and CH2 and C targets at the internal target station at the Nuclotron. • The purpose of DSS (DeuteronSpinStructure) project is broadening of energy and angular ranges of measurement of different variables in processes including 3-nucleon systems. The main aim of offered experiment program is extraction of information from spin depending part of 3-nucleon forces. • DSS project experimental program includes 2 experiments, one of them is the experiment of dp-elastic scattering study. During it will be done measurement of cross-section, vector Ay, tensor Ayy and Axx analyzing powers in dp-elastic scattering in the range of 300 and 1000 MeV of the deuteron kinetic energy. • The goal for the nearest runs is to measure the cross-section of dp-elastic scattering reaction in wide deuteron energy range with the step not more than 100 MeV in the region from 500-1000 MeV. This is needed for an experiment to measure analyzing powers for the dp-elastic scattering. Page 2

  3. Internal Target Station target beam Page 3

  4. Scheme of the experiment P and D - proton and deuteron detectors (dp-elastic scattering) PP-L and PP-R –proton detectors (pp-quasi elastic scattering) M 1-6 - monitor counters. M 1 - 6 PP-L Vertical P Horizontal plane plane Beam D PP-R Page 4

  5. Counter# 2 forP andDdetectors Internal target Detector’s base Photomultiplier FEU-85 Scintilator’s cover Hull Scintillator PMT base Experimental setup at the Internal Target Station P and D detector Beam -Scintillators:1) 20*25*5 mm or 10*25*5mm (counter#1) 2) 20*25*20 mm (counter#2) Page 5

  6. Proton energy losses Data handling Deuteron energy losses CH2 DATA 880MeV N events N events Proton energy losses (channels) Deuteron energy losses (channels) Deuteron & Proton energy losses Deuteron-Proton TOF N events Proton energy losses (channels) Deuteron energy losses (channels) Deuteron-Proton TOF (channels) The results obtained at 880MeV deuteron beam on polyethylene target: a) deuteron energy losses, b) proton energy losses, c) correlation of proton and deuteron energy losses, d) time difference between the signals for deuteron and proton detectors. Page 6

  7. Gauss+Const fit TDC spectra with gates MPV - 4*Sigma MPV + 4*Sigma TDC SPECTRA FITTING Data handling 880 MeV СН2 target 60 deg. c.m. deuteron scattering N events N events N events TDC (Channels) TDC (Channels) TDC (Channels) Page 7

  8. ADC CORRELATION GRAPHICAL CRITERIA Denergy losses (channels) Denergy losses (channels) D energy losses (channels) D energy losses (channels) P energy losses (channels) P energy losses (channels) P energy losses (channels) P energy losses (channels) APPLYING ADC GRAPHICAL CRITERIA ADC correlation w.o. TDC gates ADC correlation with TDC gates ) Page 8

  9. Getting normalization coefficient fitting the time difference spectra CARBON DATA CH2 DATA Gauss+constfit K = constCH2/constC Time difference spectra obtained on polyethylene (a) and carbon (b) targets. Page 9

  10. CH2-C time difference spectra subtraction Result of CH2-Сsubtraction N events N events CH2 C TDC (channels) TDC (channels) Time difference distribution for dp-elastic events obtained from CH2-C Page 10

  11. Event yield of dp-elastic scattering Td=880 MeV Td=880MeV event yield Event yield=Ndp-elastic/Npp-quasielastic d-angle (deg. c.m.s) Page 11

  12. Cross section of dp-elastic scattering Td=880MeV PRELIMINARY (mb/sr) Page 12

  13. Cross section of dp-elastic scattering Td=500MeV (mb/sr) PRELIMINARY Page 13

  14. Conclusions The following results has been obtained: • The procedure of the dp-elastic scattering cross-section measurements at internal target station at Nuclotron using CH2-C subtraction has been established. • The first results of the cross-section measurement in dp-elastic scattering at the energies of 500 and 880 MeV have been obtained. The results show the reasonable behaviour as the function of the scattering angle. • The goal for the nearest runs is to measure the cross-section of dp-elastic scattering reaction in wide deuteron energy range with the step not more than 100 MeV in the region from 500-1000 MeV. Page 14

  15. Collaboration Yu.V.Gurchina, A.Yu.Isupova,M.Janeka,b, J.-T.Karachuka,c, A.N.Khrenova, V.A.Krasnova, A.K.Kurilkina, P.K.Kurilkina, V.P.Ladygina, A.N.Livanova,S.M.Piyadina, V.L.Rapatskya,S.G.Reznikova, A.A.Terekhina , T.A.Vasilieva • a JINR, Dubna • b P.J.Shafaric University, Koshice, Slovakia • c Advansed Research Institute for Electrical Engineering, Bucharest, Romania Page 15

  16. THANK YOU! Yury Gurchin Page 16

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