1 / 42

The J-PARC Hypernuclear Physics Programs - Hyperonization in dense nuclear matter -

The J-PARC Hypernuclear Physics Programs - Hyperonization in dense nuclear matter -. Toshiyuki Takahashi IPNS, KEK. Contents. Introduction of J-PARC Facility Hadron Hall Physics Programs PAC Meeting Hypernuclear Physics at S=-2 Hypernuclear Physics at S=-2

yestin
Download Presentation

The J-PARC Hypernuclear Physics Programs - Hyperonization in dense nuclear matter -

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The J-PARC Hypernuclear Physics Programs- Hyperonization in dense nuclear matter - Toshiyuki Takahashi IPNS, KEK Dense and Cold Nuclear Matter and Hard Exclusive Processs

  2. Contents • Introduction of J-PARC Facility • Hadron Hall • Physics Programs • PAC Meeting • Hypernuclear Physics at S=-2 • Hypernuclear Physics at S=-2 • Physics on Hadrons with Strangeness • Summary Dense and Cold Nuclear Matter and Hard Exclusive Processs

  3. Tokai Village Tokai-2 Nuclear P.S. J-PARC the Pacific Ocean Hitachinaka P.S. Dense and Cold Nuclear Matter and Hard Exclusive Processs

  4. J-PARC Facility Hadron Hall (Slow Extracted Beams) 3GeV Rapid Cycling (25Hz) Synchrotron (1MW) Neutrino Beamline to Super-Kamiokande Linac Materials and Life Science Facility 50 GeV Synchrotron (0.75MW) Japan Accelerator Research Complex Joint Project between KEK and JAEA Dense and Cold Nuclear Matter and Hard Exclusive Processs

  5. Phase 1 & 2 • The budget for about 2/3 of the entire project has been approved by the Japanese government from JFY2001 as Phase 1. • Phase 1 (~151 billion Yen) consists of major accelerator components and a part of experimental facilities. • 270 kW for slow extraction • half size of Hadron Hall JAEA KEK Dense and Cold Nuclear Matter and Hard Exclusive Processs

  6. Facility Operation Construction Start Construction Schedule Current Dense and Cold Nuclear Matter and Hard Exclusive Processs

  7. Hadron Hall Dense and Cold Nuclear Matter and Hard Exclusive Processs

  8. Proton Beam (30-GeV) Hadron Hall Layout (Phase 1) K1.8 (2009 Sep.) K1.8BR (2008 Dec.) KL(2010?) Primary beams Production Target (T1) K1.1 K0.8 Dense and Cold Nuclear Matter and Hard Exclusive Processs

  9. Secondary Beamlines K1.8 K1.8BR High-reslution beam spectrometer High intensity K- beams are available !! Kaon Factory Dense and Cold Nuclear Matter and Hard Exclusive Processs

  10. Physics Programs • PAC Meeting • 1st Jun.31 – Jul.2, 2006 • 2nd Jan.10 – Jan.12, 2007 • 3rd Jul.6 – Jul.7, 2007 • 17 Proposals & 7 LOI’s • Stage-2 Aproval 9 (5 Day-1 Experiment) • Stage-1 Aproval 6 • Deffered 1 • Rejected 1 Dense and Cold Nuclear Matter and Hard Exclusive Processs

  11. Hypernuclear Physics at S=-2 Hypernuclear Physics at S=-1 Physics on Hadrons with Strangeness Dense and Cold Nuclear Matter and Hard Exclusive Processs

  12. Hypernuclear Physics at S=-2 • E07 Systematic Study of Double Strangeness Systems with an Emulsion-counter Hybrid Method • E05 Spectroscopic Study of X-Hypernucleus, 12XBe, via the 12C(K-,K+) Reaction • E03 Measurement of X rays from X- Atom Dense and Cold Nuclear Matter and Hard Exclusive Processs

  13. Motivation to Study S=-2 System • New sector of Baryon-Baryon interaction • LL weakly attractive • XN attractive ? • XN->LL • Very dynamic system • Small mass difference LL and XN (and H?) • Significant step toward multi-strangess systems • Core of neutron star ... Dense and Cold Nuclear Matter and Hard Exclusive Processs

  14. S=-2 System XN->LL coupling Mixing effect is more significant in S=-2 system Dense and Cold Nuclear Matter and Hard Exclusive Processs

  15. Strange baryons apear in the core of neutron star... What kind of baryons will apear ? At how much density will they apear? depend on mass, charge, interaction Negative baryons are favorable. reduce electron Fermi energy S- was supposed to be important. However its interaction with neutron matter is found to be strongly repulsive. X- and its interaction should be important. Potential and Impact on Neutron Stars Dense and Cold Nuclear Matter and Hard Exclusive Processs

  16. How to produce and studyS=-2 systems K- + p -> K+ + X- p(K-)~1.8GeV/c Direct production Reaction Spectroscopy (E05) X-rays Measurements (E03) Decay measurements Emulsion (E07) Dense and Cold Nuclear Matter and Hard Exclusive Processs

  17. E07 Previous Studies on Double-Strangeness Systems KEK-PS-E373 (1998 - ) Twin hypernucleus X- (binding) energy at the absorbed point X- Nucleus interaction Weakly attractive LL interaction Dense and Cold Nuclear Matter and Hard Exclusive Processs

  18. l t l l i (12C) r l l p b E07 Systematic Study of Double Strangeness Systems with an Emulsion-counter Hybrid Method • Double L Hypernuclei • expected ~100 events • extend known species • species dependence of DBLL • decay form • H-dibaryon • X-Nucleus Interaction • twin hypernuclei • X-ray from atomic states • Unknown Phenomena Dense and Cold Nuclear Matter and Hard Exclusive Processs

  19. E05 Previous Studies on X-Hypernucleus and X Potential DM=14MeV BNL-E885 (K-,K+) Missing Mass Spectroscopy on C KEK-E224 DM=22MeV Evidence !? V = -14 MeV T.Fukuda et. al, PRC58(1998)1306 insufficient resolution poor statistics P.Khaustov et al, PRC61(2000)0546 Dense and Cold Nuclear Matter and Hard Exclusive Processs

  20. Missing mass spectroscopy K1.8 Beam Spectrometer Dp/p=3.3x10-4(FWHM) SksPlus Spectrometer Dp/p=1.2x10-3(FWHM) ~30 msr ~3 MeV(FWHM) resolution ~190 bound events 1.6x106 /spill K- beams 1 month data-taking Spectroscopic Study of X-Hypernucleus, 12XBe, via the 12C(K-,K+) Reaction E05 GX=1MeV expected spectrum VX=-20MeV VX=-14MeV Dense and Cold Nuclear Matter and Hard Exclusive Processs

  21. X- Nuclues potential Real part Level energy shift Imaginary part Width X ray yield Regardless of potential detail attractive / repulsive strong / weak absorption Complementary to E05 E03 surface region of the potential E05 inner part of the potential l=n-1 target l=n-2 l=n-3 ... X K- K+ ... Z Energy (arb.) nuclear absorption X- ... X ... Z X ray l (orbital angular momentum) E03 Measurement of X rays from X- Atom Dense and Cold Nuclear Matter and Hard Exclusive Processs

  22. Hypernuclear Physics at S=-1 • E10 Production of Neutron-rich Lambda-Hypernuclei with the Double Charge-exchange Reaction • E13 Gamma-ray Spectroscopy of Light Hypernuclei • E18 Coincidence Measurement of the Weak Decay of 12LC and the Three-body Weak Interaction Process • E22 Exclusive Study of the Lambda-N Weak Interaction in A=4 Lambda-Hypernuclei Dense and Cold Nuclear Matter and Hard Exclusive Processs

  23. KEK-E521 Double Charge eXchange (p-,K+), (K-,p+) N>>Z (I=3/2, 2) E10 Neutron-rich L Hypernuclei and DCX Reaction No Charge eXchange (p+,K+), (K-,p-) ordinary nuclei L hypernuclei Dense and Cold Nuclear Matter and Hard Exclusive Processs

  24. LS coupling important in n-rich hypernuclei L potential in n-rich enviroment strangeness contents in neutron stars Change of nuclear structure if isospin=0 Nucleus L A(I0) A(I=0) A(I0) A(I=0) Ordinary S S energically supressed L L if isospin0 A*(I=1) Excited Nucleus S L n OK! Hyper-nucleus Exotic E10 Motivation Core + L Deformed Core + L n-rich hypernucleus Hypernucleus + neutron halo Dense and Cold Nuclear Matter and Hard Exclusive Processs

  25. Two step reaction p-p->p0n, p0p->K+L p-p->K0L, K0p->K+L Small cross section ~10 nb/sr (10-3 of NCX) Need high intensity beam 1x107 /spill p- beam pp=~1.2GeV/c Need high resolution ~2 MeV/c2(FWHM) with SKS Yield estimate for 9LHe ~300 events with 3 weeks E10 Produdution of N-rich Hypernuclei KEK-E521 10B(p-,K+)10LLi ~45 events at bound region No backgound Dense and Cold Nuclear Matter and Hard Exclusive Processs

  26. Physics on Hadrons with Strangeness • E15 A Search for Deeply-Bound Kaonic Nuclear States by In-flight 3He(K-,n) Reaction • E17 Precision Spectroscopy of Kaonic 3He 3d->2p X-rays • E19 High-Resolution Search for Q+ Pentaquark in p+p->K+X Reaction Dense and Cold Nuclear Matter and Hard Exclusive Processs

  27. KpX Exp. (KEK) -> strongly atractive in K-p system L(1405) as a bound state of K- and p Kaonic nuclear states may exist. E15 Kaonic Nuclear States contour plot of nucleon density distribution by AMD A.Dote et al., PRC70 (2004) 044313. T.Yamazaki and Y.Akaishi Phys. Lett. B535(2002) 70. rcenter = ~10 r0 Ultra high density nuclear matter (c.f. core of neutron stars ) could be obtained !! glue-like role of K- Dense and Cold Nuclear Matter and Hard Exclusive Processs

  28. 3He K- K-pp p L p- p E15 Missing-Mass Spectroscopy and Invariant-Mass Spectroscopy Production 3He(K-,n)X n Missing-mass spectroscopy Decay K-pp ->L p -> p p- n Invariant-mass spectroscopy K- CDS in Solenoid Magnet @K1.8BR beamline Dense and Cold Nuclear Matter and Hard Exclusive Processs

  29. Summary • The construction of J-PARC facility will be completed and its operation will start soon. • MR operation 2008 May • First beam to Hadron Hall 2008 Dec. • K1.8BR 2008 Dec. • K1.8 2009 Sep. • Hadron facility is “Kaon Factory”. • 1.4 x 106 K-/spill, K-/(p- + m-)=3.5 @1.8GeV/c@K1.8 • 1.2 x 106 K-/spill K-/(p- + m-)=0.9 @1.1GeV/c@K1.8BR • A lot of physics programs on hypernuclear & strangeness physics are waiting the beam. • Research on S=-2 system is main subject among them Dense and Cold Nuclear Matter and Hard Exclusive Processs

  30. Backup Dense and Cold Nuclear Matter and Hard Exclusive Processs

  31. J-PARC PAC System and Beamtime Charge PAC for Materials & Life Proposals PAC for Particle & Nuclear Proposals Beamtime Charge Dense and Cold Nuclear Matter and Hard Exclusive Processs

  32. Commissioning & Linac Energy Recovery Construction needs to start from JFY2008, hopefully for 3 years, as shown in this figure. Issue and Concern: This budget plan has not been included in the current plan at JAEA. JFY2008 JFY2009JFY2010JFY2011JFY2012 JFY2013 Phase 1 Completion Dense and Cold Nuclear Matter and Hard Exclusive Processs

  33. 190 Oku Yen / year ($190M/y if $1=100Yen) Cost Analysis for Operational Budget Dense and Cold Nuclear Matter and Hard Exclusive Processs

  34. UX , GX and Partial Wave Contributions in Nuclear Matter (MeV) • OBE (NHC-D, Ehime) • no t-channel meson exchange • odd-state attraction • strong A-dependence of VX • small width • ESC04d* • strong attraction of 3S1(T=0) • large width Dense and Cold Nuclear Matter and Hard Exclusive Processs

  35. Selection of targets • Physics view: Batty et al. PRC59(1999)295 • For given state, there is optimal target • Nuclear absorption is reasonably small • X-ray energy shift and width are the largest (~1 keV) • They suggested 9F, 17Cl, 53I, and 82Pb for n=3,4,7,9. • The choice depends on the optical potential itself  We can’t know before the 1st experiment Dense and Cold Nuclear Matter and Hard Exclusive Processs

  36. For the 1st experiment • We chose Fe (Iron) because of (mostly) experimental reason • Production rate: A-0.62 as cross section scales with A0.38 • Stopping probability: requires high target density (X- range: 10-20 g/cm2, bgct ~ 2cm) • X-ray absorption: significant at large Z  Small Z(A), yet high density • Koike calculated the energy shift (width) & yield of the Fe X ray (n=6  5) • Woods-Saxon potential: -24 - 3i MeV • Energy shift: 4.4 keV, width: 3.9 keV • Yield per stopped X-: 0.1 (~0.4 without absorption) Dense and Cold Nuclear Matter and Hard Exclusive Processs

  37. Yield & sensitivity estimation • Total number of K-: 1.0x1012 for 100 shifts. • Yield of X • production:3.7×106 • stopped: 7.5×105 • X-ray yield：　2500 for n=65 transition • 7200 for n=76 • Expected sensitivity • Energy shift: ~0.05 keV (systematic dominant)  Good for expected shift (~1 keV, 4.4 keV by Koike ) < 5% accuracy for optical potential depth • Width: directly measurable down to ~ 1 keV • X-ray yield gives additional (indirect) information on absorption potential. Dense and Cold Nuclear Matter and Hard Exclusive Processs

  38. Expected X-ray spectrum n= 65 shift & width 0 keV Dense and Cold Nuclear Matter and Hard Exclusive Processs

  39. Expected X-ray spectrum(2) n= 65 shift & width 4 keV Dense and Cold Nuclear Matter and Hard Exclusive Processs

  40. p 1H Stable 2H Stable 3H Stable 4H No evidence 5H Resonance 6H No evidence n glue like role of L L 2LH Not bound 3LH Stable 4LH Stable Exotic L-hypernuclei • Example of “hydrogen” Super Heavy Hydrogen 5LH No evidence 6LH Stable ? 7LH Stable ? We can produce at J-PARC Hyper Heavy Hydrogen Dense and Cold Nuclear Matter and Hard Exclusive Processs

  41. Requirement: Resolution (1) • Clear identification of hypernuclei • Binding energy (guess) : 9LHe ~8MeV, 6LH ~3MeV • Strong quasi-free L-production background In the case of 6LH hypernucleus Energy resolution ≤ 2.5MeV (FWHM) Dense and Cold Nuclear Matter and Hard Exclusive Processs

  42. Production cross section • 4LHe(g.s., 0+) production • estimation with DWIA by T. Harada Dense and Cold Nuclear Matter and Hard Exclusive Processs

More Related