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RIKEN/Tokyo-Russia Collaboration of Polarized Deuteron Experiments

RIKEN/Tokyo-Russia Collaboration of Polarized Deuteron Experiments. CNS, Univ. of Tokyo T. Uesaka. Polarized Deuteron Beam. Polarized Deuteron unique probe to isoscalar spin excitations missing collectivity in nuclei (V s mode) N* excitations tensor polarization observables

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RIKEN/Tokyo-Russia Collaboration of Polarized Deuteron Experiments

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  1. RIKEN/Tokyo-Russia Collaborationof Polarized Deuteron Experiments CNS, Univ. of Tokyo T. Uesaka

  2. Polarized Deuteron Beam Polarized Deuteron unique probe to isoscalar spin excitations missing collectivity in nuclei (Vs mode) N* excitations tensor polarization observables direct signature of tensor interaction smallest nuclei indispensable tool in few body physics TECHNICALLY difficulty in manipulating particle with spin ONE and small magnetic moment

  3. Polarized Deuteron Beam at RIKEN RARF 140－270 MeV Spin-isospin excitation via (d,2He) and (d,d’) reactions 3N force effects via d+p elastic scattering short-range structure of deuteron, 3He Polarization axis can be freely controlled Wien Filter system single turn extraction Maximum intensity > 100nA on target Ed=880MeV at RIBF

  4. Polarized Deuteron Beam at JINR Nuclotron (new machine) super-conducting strong focus Ed < 12 GeV

  5. Physics Programs with Nuclotron • Nucleon Structure • Nuclear Structure short-range structure of deuteron and 3He • Medium effects on particle production • Modification of nuclear matter • Hypernuclei and h nuclei With booster cycle: 10 s

  6. Cumulative Production and d Structure • “Cumulative Production”(A.M.Baldin, prev. director of LHE, JINR) production of energetic particle which is impossible in nucleon-nucleon kinematics. Deuteron induced “cumulative” proton production can be a unique probe to deuteron structure at short distances approach to QCD prediction strange structures in the resonance region T.Aono et al., PRL 74 (1995) 4997. L.S. Azhgirey et al., PLB 391 (1997) 22. A.A.Nomofilov et al., PLB 325 (1994) 327.

  7. RIKEN/Tokyo-Russia Collaboration • Subject Structure of light nuclei at short-range, putting special focus on its spin dependences • Brief history 2000 Collaboration Agreement between RIKEN and JINR (～2003) 2000 Nov. 1st collaboration experiment dd →n3He(p3H) measurement at RIKEN 2002 Apr. JINR proposal 3He(d,p)4He (CUPID3 project) approved 2004 Mar. Collaboration Agreement between Univ. Tokyo and JINR 2004~ development of deuteron polarimeter

  8. EXPERIMENT at RIKEN

  9. Extension of cumulative production to study of 3N system Reaction mechanism theoretical study J.M. Laget et al., Nucl. Phys. A370 (1981) 479. before 2000, only cross section data available. polarization data, especially tensor analyzing power is necessary to probe the D-state effect in three nucleon system. 1st measurement of pol. observables at RIKEN (V.P.Ladygin) 3He Structure studied via d+d →3He+n

  10. Results of R308n experiment Tensor analyzing power T20 2000 November 1st experiment under collaboration of RIKEN/Tokyo-JINR Lines: solid Urbana dashed Paris dots RSC V.P. Ladygin, T. Uesaka et al., Phys. Lett. B 598 (2004) 47. Ed=140, 200, 270 MeV clear signature of D-state effect in 3He

  11. EXPERIMENT at JINR

  12. CUPID3 Project at Nuclotron • Spin Correlation Measurement of polarized deuteron beam and polarized 3He target T. Uesaka et al., Phys. Lett. B 467 (1997) 199. T. Uesaka et al., Phys. Lett. B 533 (2002) 1.

  13. CUPID3 Project at Nuclotron 2002 Apr. Approved 1000 hours (including test machine time) ~2004 no progress due to insufficient intensity of polarized deuteron beam (~107cps) for the spin correlation measurement intensity of ~ 109 cps is necessary. This is partly due to the short injection time of Nuclotron (8ms) compared with the previous Synchrophasotron.

  14. Polarized Ion Source at Nuclotron • POLARIS (Pilipenko) long pulse duration vector OR tensor polarization separate experiments for vector and tensor measurements different polarimetry for vector and tensor polarizations vector: d+p quasi-elastic scattering tensor: deuteron breakup reaction • CIPIOS @ IUCF (Derenchuk) →to Duban in this year short pulse operation → increase of beam intensity by two orders of magnitude vector AND tensor polarization simultaneous measurement of vector and tensor observables NEED new polarimetry for both vector and tensor polarizations

  15. d+p Scattering as a deuteron polarimetry • Large vector and tensor analyzing powers • Coincidence measurement of deuteron and proton Simple detector system with plastic scintillators CH2 can work as a hydrogen target Established at intermediate energies

  16. d+p Elastic Scattering at GeV energies 1.06 GeV: J.S. Vincent et al., Phys.Rev.Lett.24 (1970) 236. 1.6 GeV : E. Winkelmann et al., Phys.Rev. C21 (1980) 2535. 2.0 GeV : G.W. Bennett et al.,Phys.Rev.Lett.19 (1967) 387. approximate t-scaling considerably large Ay, Ayy even at backward angles

  17. Internal Target Station of Nuclotron

  18. Schedule • 2004 June run Beam Lifetime measurement with CH2 target t = 10s for 2mm-thick target • 2004 November-December run detector test evaluation of accidental coincidence rate @ 0.88 － 2 GeV • 2005 February-March run measurement of vector and tensor analyzing powers at 7 energies (0.88, 1.0, 1.25, 1.5, 1.6, 1.75, and 2.0 GeV) RIBF energy

  19. Collaborators

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