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Spin Correlation Parameter C yy of p + 3 He Elastic Backward Scattering at Intermediate Energy

Spin Correlation Parameter C yy of p + 3 He Elastic Backward Scattering at Intermediate Energy. Youhei Shimizu RCNP, Osaka University. Collaborators. RCNP, Osaka University : Y. Shimizu , K. Hatanaka, Y. Sakemi, A. Tamii, H.P. Yoshida,

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Spin Correlation Parameter C yy of p + 3 He Elastic Backward Scattering at Intermediate Energy

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  1. Spin Correlation Parameter Cyyof p + 3He Elastic Backward Scattering at Intermediate Energy Youhei Shimizu RCNP, Osaka University

  2. Collaborators RCNP, Osaka University : Y. Shimizu, K. Hatanaka, Y. Sakemi, A. Tamii, H.P. Yoshida, M. Uchida, Y. Shimbara, K. Fujita, Y. Tameshige, H. matsubara CNS, University of Tokyo : T. Uesaka, T. Wakui, T. Kawabata, Y. Sasamoto Saitama University : K. Itoh Kyushu University: K. Sagara, T. Wakasa, T. Kudoh, M. Tomiyama, H. Ohira Osaka University: T. Adachi Tohoku University: H. Okamura RIKEN: H. Ueno, K. Suda

  3. Contents • Introduction 1.1. Few Body System 1.2. Elastic Backward Scattering • Experimental Setup 2.1. RCNP Ring Cyclotron Facility 2.2. Polarized 3He Target • Results 3.1. Calibration of 3He Polarization 3.2.p+3He Elastic Backward Scattering 3.3. Comparison with Theoretical Prediction • Summary

  4. Introduction Few body system Triton binding energy (MeV) p+d Elastic Scattering Some problems in the spin structure of 3NF d+p Break-up Reaction d+p Capture Reaction ...... K. Hatanaka et al., PRC 44, 44002 (2002)

  5. Elastic Backward Scattering (EBS) Structure of the lightest nuclei (d, 3He, a) at short distances between the constituent nucleons • Elastic Backward Scattering (EBS) • Spin Correlation Parameter Cyy high momentum components of the target wave function target-related spin observable is sensitive to the spin-dependent parts of the target wave function p + 3He EBS at RCNP

  6. Experimental Condition • Beam : Polarized proton 200, 300, 400 MeV 10 ~ 40 nA, polarization ~ 70 % • Target : Polarized 3He gas target polarization ~ 10 % • Angle : 0 degrees • Solid angle : 2.8 msr • Reaction : 3He(p,p+)4He 3He(p,3He)p • Observables : 3He polarization ds/dW, Cyy

  7. Experimental Setup Overview of the RCNP Ring Cyclotron Facility Grand Raiden D1 Faraday Cup

  8. The Schematic view of the Polarized 3He Target Density : 8.96e+19 cm-3 Max Polarization : 19 %

  9. Measurement of 3He Polarization • AFP (Adiabatic Fast Passage) - NMR • 3He(p,p+)4He Monitor throughout the experiment NMR signal is proportional to the amount of polarization. Need to be calibrated by another method. Calibration by using polarized proton beam

  10. 3He(p,p+)4He Very Preliminary Relation to AFP-NMR Amp. K.M. Furutani et al., PRC 50, 1561(1994)

  11. p+3He Elastic Backward Scattering Very Preliminary • Cross Section is consistent with other experimental data. • New data for spin correlation parameter Cyy

  12. Comparison with Theoretical Prediction • For Cyy, there are large discrepancy 2N+PI DIR PI ODE+PI+DIR Calculated by A.P. Kobushkin

  13. Reaction Mechanism • One-Deuteron-Exchange dd or d* Ep < ~200 MeV • rescattering of the intermediate PIon off the intermediate deuteron 200 MeV < Ep < 1000 MeV • DIRect proton interaction Ep > 1000 MeV

  14. d d or d* (pn)s Contribution of the Singlet Deuteron • ODE (Ep < ~ 0.2 GeV) • PI (0.2 GeV < Ep < 1 GeV) • DIR (Ep > 1 GeV) For pure deuteron exchange, Cyy= -2/3 independent on the beam energy Calculated by A.P. Kobushkin

  15. Summary • For p+3He EBS at 200, 300, 400 MeV, ds/dW, Cyy were measured at RCNP. • 3He polarization was calibrated by 3He(p,p+)4He reaction. Max Polarization : 19 % • Experimental results were compared with existing data and theoretical predictions. ds/dW : consistent with existing data Cyy:large discrepancy with theoretical predictions

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