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Breakup reaction for polarimetry of t ensor polarized deuteron beams

Breakup reaction for polarimetry of t ensor polarized deuteron beams. A.P. Kobushkin Bogolyubov Institute for Theoretical Physics Metrologicheskaya str. 14B 03680 Kiev, Ukraine E.A. Strokovsky Laboratory of High Energy Physics Joint Institute for Nuclear Research

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Breakup reaction for polarimetry of t ensor polarized deuteron beams

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  1. Breakup reaction for polarimetry of tensor polarized deuteron beams A.P. Kobushkin Bogolyubov Institute for Theoretical Physics Metrologicheskaya str. 14B 03680 Kiev, Ukraine E.A. Strokovsky Laboratory of High Energy Physics Joint Institute for Nuclear Research 141980, Dubna, Russia Based on talk given at the “SYMMETRIES AND SPIN (SPIN-Praha-2012)” Conference, Prague, July 1 - 8, 2012; JINR preprint Е2-2013-14, Dubna, JINR, 2013. See also A.P.K. and E.A.S., Phys. Rev. C 87 (2013), 024002 E.A.Strokovsky,Dubna, 18.03.2013

  2. Common interest to the lightest nuclei structure at short distances or high relative momenta between constituents resulted in lack of attention to behaviour of spin-dependent observablesat long distances or at small relative momenta. To avoid this bias we paid special attention to behaviour of the observables at this small relative momenta region as well. The goal of this talk is to demonstrate that: Deuteron breakup at 0o can be used for local polarimeters at SPD as well as MPD. Polarization monitoring can be easily realized. Existing data obtained with polarized deuterons contain more physical information than it was extracted so far. E.A.Strokovsky,Dubna, 18.03.2013

  3. Selected experimental data concerning the deuteron structure (hadron probes; reminder). E.A.Strokovsky,Dubna, 18.03.2013

  4. Total cross section for deuteron-proton scattering (intermediate energy region) E.A.Strokovsky,Dubna, 18.03.2013

  5. Breakup (d,p)X at 0o, backward elastic scattering Cross section Tensor analysing power Polarization transfer coefficient (from vector polarized deuteron to proton) The key tool: polarized deuteron beams in Dubna and Saclay. Light cone variable E.A.Strokovsky,Dubna, 18.03.2013

  6. Deuteron breakup and the D2 parameter for deuteron E.A.Strokovsky,Dubna, 18.03.2013

  7. Definition for deuteron in literature: At small k: E.A.Strokovsky,Dubna, 18.03.2013

  8. M – nucleon mass, B – binding energy of deuteron Knutson&Haeberli (1976): D2 = (0.432 0.032); W. Gruebler et al (1980): d = (0.0259 0.0007); k in Fm-1 k in GeV/c = -(22.19  0.82) when k is taken in GeV/c Dd2 is positive. (Instead of d many people often use notation d). E.A.Strokovsky,Dubna, 18.03.2013

  9. Reminder: existing data on deuteron breakup (inclusive) E.A.Strokovsky,Dubna, 18.03.2013

  10. Zoom at the next slide E.A.Strokovsky,Dubna, 18.03.2013

  11. Deuteron breakup by protons (Z=1) Energy range: Tkin=2.1 GeV (Saclay, data tables publ. in 1987 & 1989), 7.4 GeV (Dubna, data tables publ. in 1996) Excluded from the fit E.A.Strokovsky,Dubna, 18.03.2013

  12. Knutson&Haeberli (1976): 2D2 = (22.19  0.82) (k in GeV/c) W. Gruebler et al : (1980 ): 2D2 = (24.80  0.67) Our fit of the p(d,p)X data: 2D2 = (23.70  0.33) Theoretical value of d (or d) is around 0.0254  0.0259; experimental value (averaged) is 0.0256(4); what results in 2D2 = 24.51  0.38 Taking into account that: the used spectator model does not include some possible corrections (Coulomb first of all) and only statistical errors are taken into account and those were not a dedicated measurements of T20at low q (the main interest was to the high q region), the obtained value is in rather good agreement with existing data even without optimization of the q-range. The p(d,p)X reaction in GeV region can be used as additional source for data on d (or d) . E.A.Strokovsky,Dubna, 18.03.2013

  13. From V.M.Krasnopol’sky et al, PhL 165B (1985) p.7: Potential: RSC d = 0.0262  2D2 = 25,09 RHC d = 0.0259  2D2 = 24,80 Yale d = 0.0254  2D2 = 24,32 Paris d = 0.0261  2D2 = 24,99 MSU (old) d = 0.0269  2D2 = 25,76 From E. Epelbaum, Braz. Journ. Ph., v. 35, p. 854. (2005): N3LO in chiral EFT: d = 0.0254  2D2 = 24,32 d = 0.0255  2D2 = 24,42 From http://nn-online.org/, NN potential by Nijmegen group: Nijm II: d = 0.02521  2D2 = 24,14 Nijm 93: d = 0.02524  2D2 = 24,17 Reid93: d = 0.02514  2D2 = 24,07 Our fit of the p(d,p)X (0o) data: 2D2 = (23.70  0.33) E.A.Strokovsky,Dubna, 18.03.2013

  14. Effects of the Coulomb interaction (hints) E.A.Strokovsky,Dubna, 18.03.2013

  15. Deuteron breakup by carbon (Z=6) A.P. KOBUSHKIN, YA.D. KRIVENKO-EMETOV, Ukr. J. Phys. 2008. V. 53, N 8, p.751 Dash-dotted line: quasi-impulse approx. Dashed line: multiple scatt. + Pauli principle for all constutuent quarks in deuteron; Full line: Coulomb interaction is added E.A.Strokovsky,Dubna, 18.03.2013

  16. Deuteron breakup by carbon (Z=6) Tkin= 7.4 GeV (Dubna, data tables publ. in 1990 & 1996) E.A.Strokovsky,Dubna, 18.03.2013

  17. Conclusions. Deuteron breakup with spectator proton detection at 0o at momentum in vicinity of pd /2 is very useful reaction for: (1) deuteron beam polarimetry at intermediate and high energies both for tensor polarization (energy independent, high figure of merit  T202!) and vector polarization (proton polarization must be measured); (2) obtaining new experimental data about the deuteron asymptotic D/S ratio; experimental estimates of Coulomb effects in deuteron breakup; the Coulomb effects in T20 are (apparently) small. E.A.Strokovsky,Dubna, 18.03.2013

  18. Thank you! E.A.Strokovsky,Dubna, 18.03.2013

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