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JLab PAC33 16, Jan, 2008 (Wed) Satoshi N. Nakamura Tohoku Univ.

Spectroscopic study of L hypernuclei in the medium-heavy mass region and p-shell region using the (e,e’K + ) reaction (PR08-002). JLab PAC33 16, Jan, 2008 (Wed) Satoshi N. Nakamura Tohoku Univ. New proposal to PAC33. Based on the analysis experiences of

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JLab PAC33 16, Jan, 2008 (Wed) Satoshi N. Nakamura Tohoku Univ.

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  1. Spectroscopic study of L hypernuclei in the medium-heavy mass region and p-shell region using the (e,e’K+) reaction (PR08-002) JLab PAC33 16, Jan, 2008 (Wed) Satoshi N.Nakamura Tohoku Univ.

  2. New proposal to PAC33 • Based on the analysis experiences of E01-011 (HKS), we need more calibrations • Medium-heavy region, high quality data for 40Ca target is longed. • Recent progresses on p-shell hypernuclear theories, more data on 7Li, 10B. Additional beam time request to the partially approved E05-115 (HES)

  3. E89-009 12ΛB spectrum Hypernuclear Programs at JLab First Generation 2000 E89-009 (Hall C) First (e,e’K) hypernuclear spectroscopy ~ 2 months data Resolution < 1 MeV [FWHM] 12LB (gs) Yield < 0.5-0.9 / h (165 counts / 440 h) Beam: 0.66 μA , 1.8 GeV SOS:Δp/p=5 x 10 -4 [FWHM] Solid angle 4 msr(w/ splitter) Enge: Δp/p=5 x 10 -4 [FWHM] Successfully Demonstrated : (e,e’K) spectroscopy is Possible! T.Miyoshi et al.PRL90 (2003) 232502 L.Yuan et al.PRC73 (2006) 044607

  4. Hypernuclear Programs at JLab Hall A Experiment 2004,5 E94-107 (Hall A) p-shell hypernuclear spectroscopy (12C, 9Be, 16O) Resolution 650 keV [FWHM] 12LB (gs) Yield ~ 2-4 / h Excellent S/N Water Fall Target Beam: 100 μA , 4GeV HRS:Δp/p=2.5 x 10 -4 [FWHM] Solid angle 4.5 msr(w/ septum) M.Iodice et al.PRL99 (2007) 52501

  5. To beamdump HKS ENGE Splitter Target Electronbeam Hypernuclear Programs at JLab 2005 E01-011 (Hall C) Second Generation First step to beyond p-shell hypernuclei (main target 28Si, calib. 12C) Resolution <400 keV [FWHM] 12LB (gs) Yield ~ 8 / h Newly introduced HKS worked fine Counts/150keV Introduction of Tilt ENGE e’ rate surpression

  6. Hypernuclear Programs at JLab Future Experiments Approved Experiments at Hall C&A E01-011 300 Third Generation Hall C = HKS + HES + SPL Hypernuclear yield improvement by HES Counts/150keV High e’ BG suppression by Tilt Method Mid-heavy target can be used 50 Wide mass range study with excellent resolution E05-115 2nd Generation E94-107 12LB Hall A = HRS + HRS + Septum Excellent S/N ratio Water Fall Target = H2O Elementary process & Detailed study on 16LN p(e,e’K)L E07-012

  7. E94-107 9Be 12C 16O E01-011 7Li 12C 28Si Hypernuclei in wide mass range 1 E89-009 12C 20 50 200 1057 A Elementary Process • Neutron/Hyperon star, Strangeness matter • Neutron/Hyperon star Strangeness electro-production Light Hypernuclei (s,p shell) • Hyperonization  • Softening of EOS ? • Superfluidity • Fine structure • Baryon-baryon interaction in SU(3) • LS coupling in large isospin hypernuclei • Cluster structure • Medium - Heavy hypernuclei • Single-particle potential • Distinguishability of a L hyperon • U0(r), mL*(r), VLNN, ... Shell model Few body calc. Bare LN Int. Mean Field Theory Cluster calc.

  8. Hypernuclei in wide mass range 1 20 50 200 1057 A E05-115＆PR08-002 6,7Li10B,11B 12C 40Ca52Cr 89Y Elementary Process • Neutron/Hyperon star, Strangeness matter Strangeness electro-production Light Hypernuclei (s,p shell) • Hyperonization  • Softening of EOS ? • Superfluidity • Fine structure • Baryon-baryon interaction in SU(3) • LS coupling in large isospin hypernuclei • Cluster structure • Medium - Heavy hypernuclei • Single-particle potential • Distinguishability of a L hyperon • U0(r), mL*(r), VLNN, ... 3rd Gen. Exp. Shell model Few body calc. Bare LN Int. Mean Field Theory Cluster calc.

  9. Various targets E01-011 First Generation E94-107 Hall A Experiment E01-011 Second Generation E05-115 Third Generation Mean Field Theory Predictions PR08-002 Third Generation

  10. Response to Theory Gr. comments A = 40 A ~ 50 P.H.Pile et al. PRL 66 (1991) 2585 Proposing PR08-002 Approved E05-115 H.Hotchi et al. PRC 64 (2001)044302 51LV 40Ca = (Z=20, N=20) : 40LK = one proton hole + L LS spilitting or core config. mixing Compare spectrum with Reliable Shell model Calc. Reliable E(Ls), E(Lp), E(Ld) inputs for Mean Field Theories Cross sections of various states constraint LN interaction models

  11. Overbinding Problem on s-shell Hypernuclei The Overbinding Problem 0.0 -0.31 MeV 1+ -1.24 MeV spin-spin 0+ -2.39 MeV -3.12 MeV Overbound Dalitz et al., NP B47 (1972) 109.

  12. + + Underbinding Problem on s-shell Hypernuclei LNN three-body force The Underbinding Problem 0.0 1+ -1.03 1+ -1.04 -0.31 MeV 1+ 0+ 1+ -1.24 MeV -1.04 0+ Underbound LN-SN coupling -3.12 MeV 0+ -2.39 MeV -2.27 0+ adjusted D2 Akaishi, Harada et al., PRL 84 (2000) 3539. LN-SN coupling is important

  13. 7Li target n Unbound neutron halo α Λ n NO DATA Bound states n α S n Direct Observation of L’s glue-like role

  14. 7Li target (A = 7) E. Hiyama Private Comm. -3.79 (EXP) Possible Charge Sym. Breaking? -5.40 (EXP) NO DATA 7Li(e,e’K+)

  15. 10B target Millener’s parameterization(V,D,SN,SL,T) Hyperball’s g data predicts >200keV 1-2- separation 10B(e,e’K) p Λ n Λ α α α α Cluster Calc. based on the same framework 10Be 10B Λ Λ Imperfect treatment of Tensor force? Bad wavefunction of the core nucleus?

  16. FIRST Generation Third Generation SOS + ENGE + SPL 40LK Simulation HKS + ENGE + SPL HKS +HES + new SPL Tilt Method SECOND Generation mid-heavy hypernuclei

  17. Proposing Calibration Procedures Momentum acceptance • Primary beam energy scan tune SPL+HKS/HES • Pe’ and Pk scan (delta scan) tune HKS, HES (not SPL) Res.toTAC One serious energy tune ~ 16 hours 10-20MeV may be easy with RF of fast FB

  18. Water Cell Target mL=1115.683MeV • p(e,e’K+)L,S0 • CH2 not sustain >2mA • Water cell target • H2O/D2O targets • SS Study for L • 16LN data L Counts (0.3MeV/bin) mS0=1192.642MeV S MM (MeV) Carbon Target Periodic calibration with the water cell target & 12C. • 12LB data • Sieve Slit • Raster study

  19. Requested beamtime in addition to E05-115

  20. HKS+HES+newSPL setup HES detectors : EDC1 was used for ENGE EDC2 …. Spare chamber of HDC EHOD … to be beam-tested in March HES HKS 1.0GeV/c e’ HKS (incl. detectors) was commissioned in E01-011 Splitter 1.2GeV/c K+ CEBAF 2.5GeV Electron Beam

  21. HES magnets were completed and left Japan for JLab. Collaboration has been preparing for E05-115 from 2005, and will be ready for installation and beam by the end of 2008.

  22. Summary • E01-011 proved that newly introduced HKS • and the tilt method worked fine. • E05-115 was partially approved for wide mass range • hypernuclear spectroscopy with new HES. • Based on recent theoretical progresses: • 7Li(e,e’K+) 7LHe few body calc., LN-SN couple • 10B(e,e’K+) 10LBe • 40Ca(e,e’K+) 40LK reliable shell model • sophisticated mean field theories • Calibration Beam energy scan, delta scan, • Water Cell target Increase physics outputs much with the resources prepared for the approved E05-115.

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