1 / 33

T. Yamazaki (RIKEN) Y. Akaishi (KEK), A. Dote (KEK), M. Iwasaki (RIKEN), T. Suzuki (Uni Tokyo),

Chiral05, February-17-2005, RIKEN. Further experimental search for strange nuclear systems Kbar Nuclear Clusters from QGP to QGB Quark-Gluon Plasma Quark-Gluon Bound System. T. Yamazaki (RIKEN)

duer
Download Presentation

T. Yamazaki (RIKEN) Y. Akaishi (KEK), A. Dote (KEK), M. Iwasaki (RIKEN), T. Suzuki (Uni Tokyo),

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. Chiral05, February-17-2005, RIKEN Further experimental search for strange nuclear systems Kbar Nuclear Clusters from QGP to QGB Quark-Gluon Plasma Quark-Gluon Bound System T. Yamazaki (RIKEN) Y. Akaishi (KEK), A. Dote (KEK), M. Iwasaki (RIKEN), T. Suzuki (Uni Tokyo), P. Kienle (IMEP, Vienna), K. Suzuki (TU, Munich), N. Herrmann (Heidelberg )

  2. Unique features of kaonic nuclei* I=0 KbarN pair attraction * condensed nuclei Non-existing nuclei:Normal nuclei : strongly bound K- (narrow)weakly bound K- (broad) (pp)S=0,T=1, (pn)S=0,T=1d: (pn)S=1,T=0 (ppp)S=1/2, J=3/2-, T=3/2t: (pnn)J=1/2,T=1/2 (ppn)S=1/2,J=3/2-,T=3/2 ** condensed:large spin-orbit splitting: p3/2 lowered ** large internal nucleon energy: EN >>0 ** K- potential: very deep EK = E - EN <<0 --->> Relativistic correction: energy pushed down

  3. _ Nuclear KNN bound states S = 0 T = 3/2 Unbound S = 1 T = 1/2 Above the L*+n threshold S = 0 T = 1/2 E = -48 MeV G= 61 MeV Strange dibaryon Iso-doublet K- (pn) S=0,T=1 Modified --->> ~ -90 MeV Observed (FINUDA) ~ -90 MeV?

  4. KEK E471 Population mechanismRole of L1405 S1(3140) FINUDA Doorway continumm fragmentation pL1405 ppK- S0(3115)

  5. Key issues Experimental signatures for high density? DECoulomb, DEls, decay particle correlation,… Formation channel vs Decay channel Invariant mass spectroscopy L + d, L + p + p Dibaryon system: (pp)T=1K-, (pn)T=1K- Double strangeness systems: ppK-K-, pppK-K-,.. Toward multi-strangeness high-density matter heavy-ion reactions QGB with K-:kaon condensation

  6. E = ENucl shrunk: >>0 + EK deep

  7. Nuclear Shrinkage ? LS splitting p1/2-p3/2 DELS ~ 60 MeV!! Coulomb displacement energy DEC (1,1) - (1,-1) = 0.1 MeV for NNNK- = 2.1 MeV for a normal charged sphere (A=3)

  8. Calculated spectral shape (Akaishi) Tp = 1.5 GeV/c L* compound

  9. Discovery of K-NNN Bound States at KEKM. Iwasaki et al. 2004 4He(stopped K-,p)K-pnn (T=1) Mc2 = 3117 MeV, G~20 MeV BK =190 MeV 4He(stopped K-,n)K-ppn (T=0,1) Mc2 = 3140 MeV, G ~ 20 MeV BK = 170 MeV p3/2-p1/2

  10. Decay pattern from a dense system Strong momentum correlation in 3-body decay ppK- ---> p + L ---> p + S+ + p- pppK- ---> p + p + L

  11. L d tK ~ tfreeze-out~ 10 fm/c

  12. Search for K- clusters as residues in heavy-ion reactions • High-density medium accommodated in QGP fire balls • Deep self-trapping centers of K- produced in fire balls • Slightly delayed decay after the freeze-out: tK > tfreeze-out • Invariant-mass spectroscopy for decay fragments Single-K-ppK- ---> L + p ppnK- ---> L + d pppK- ---> L + p + p ppnnK----> L + t pppnK----> L + 3He Double-K-ppK-K----> L + L pppK-K----> L + L pppnK-K----> L + Ld

  13. FOPI at GSI from Kutsche (PhD) 1999 Superb L identification

  14. Invariant-mass spectroscopy in H. I. Reactions1.9 GeV/u Ni + NiMinv(d+L) = 3140(17) [ppnK-]T=0

  15. ppK-K- fragment expected at 10 GeV/u c.m. L L Jaffe’s H di-baryon? uud-ubar-s-ubar-s-uud not uuddss ?

  16. Results of extremely proton-rich kaonic nuclei ppppK- pppK-K- ppppK-K- pppK- ppppK- Proton total B.E. 96.7 MeV E(K) 96.7 MeV Γ 12.5 MeV Rrms 0.81 fm ρmax 9.2 ρ0 total B.E. 75.1 MeV E(K) 75.1 MeV Γ 161.8 MeV Rrms 0.92 fm ρmax 9.9 ρ0 added 3 fm 3 fm K- added K- added ppppK-K- pppK-K- total B.E. 217.3 MeV E(K) 108.7 MeV Γ 41.2 MeV Rrms 0.73 fm ρmax 14.1 ρ0 total B.E. 205.7 MeV E(K) 102.8 MeV Γ 51.9 MeV Rrms 0.65 fm ρmax 21.6 ρ0 Proton added 3 fm 3 fm tentative 3fm 3fm 3fm E(K) = 75.1 MeV [ 77 MeV ] ρmax = 5.09 ρ(α) [ 5.1 ρ(α) ] E(K) = 102.8 MeV [ 103 MeV ] ρmax = 11.12 ρ(α) [ 12.5 ρ(α) ] E(K) = 108.6 MeV [ 110 MeV ] ρ(0) = 7.24 ρ(α) [ 7.5 ρ(α) ]

  17. 3He(K-,K+)X @ 1.8 GeV/c AGS E836LLn: 3170X-pn: 3199pppK-K-: 3422L*L*n: 3752 3000 MeV LLn: 3170 X-pn: 3199 3400 pppK-K-: 3422 L*L*n: 3752 3800

  18. Yield: Prediction by chemical equilibrium model: A. Andronic and P. Braun-Munzinger, priv.comm., 16/10/03 Observed Combinatorial background R = S/N = BR(Kppn -->Ld)YKppn /(YLYd) ~ 0.004 YL~ 0.15, Yd ~ 2 BR(Kppn->Ld) ~0.1(assumed) Thus, Observed : YKppn ~ 0.012 ppK-K- expected at 10 GeV/u cm Prediction: YKppn ~ 0.01

  19. Schematic Spontaneously, dynamically organized high density matter without the aid of gravity! Strangeness at high nuclear densities Nuclear incompressibility isovercome by the Strong K--p attraction At high density K- matter [K- p] + [K- p] + …+ n +… may be more stable

  20. Hadrons in Nuclear Matter [GeV] 1.6 1.5 - K/N=3/2 p =uud 1.4 av. - 1.3 K/N=1 1.2 - 1.1 K/N=1/2 1.0 0.9 0.8 - - K =us 0.7 0.6 r/r0 0.5 4 5 6 0 2 1 3 7 Implication of KEK exp: BKppn(obs) = 173 MeV BKpnn(obs) = 195 MeV --->> enhanced KN in medium by 14% Chiral symmetry restoration? Deeply bound p- --->> enhanced pN by 35% QCD phase transition MN < EKN < ML: no strong decay, but weak decay: --> Metastable: nsec EKN < MN: absolutely stable: Strangelet, strange star Kaon condensation

  21. Quark-Gluon Bound System Energy contour?? Ground state energy?? Quark Condensate diagramKaonic Nuclei: High density, T=0; Quark Phase Nucleon radius: rN ~ 0.8 fm Nucleon volume: vN ~ 2.1 fm3 Nucleon density: rN = 1/vN ~ 0.47 fm-3~ 2.8 r0 Compaction factor: r0/rN~ 1/2.8 --> critical density K-p subar-uud no hard core ubar-u attraction

  22. UK(r)=DEcore(r) + UK-core(r)

  23. K- clusters Cold, dense &microscopic nuclear systems a New Paradigm - QGB - so far untouched chiral symmetry restoration?quark-gluon phase? exotic nuclear dynamics, strange matter/star, kaon condensation,……

  24. KEK E471 from 4He FINUDA from 7Li,… Monoenergetic protons at 510 MeV/c Tamura et al. Yield of 4LH 4He/7Li ~ 1/4 Yield of 4LHe 4He/7Li ~ 1/3 FINUDA Yield of 4LHe

  25. Relativistic effect

  26. Cos(Lp) < - 0.86 S0p Lp mp+ mp+ mK- = 2370 mp + mL = 2054 (K -, p, p) invariant mass

  27. pppnK- ppnK- +2p+n pppK- ppppK-+2n +p ppppK- +2n 6BeK-+pnn 6BeK- +p+2n 9BK-

  28. D2 bubble chamber experiment d + K- ---> ps + L1405 + p- “n” + K- ---> L1405 + p-

  29. Evidence for ppK-(1976) decaying to p + S + p???!!! ps: high momentum componentMinv(Sp): distributedMissing mass of (K-,p-) ?Invariant mass of p + S + p ?

  30. Proposed FOPI experiment (I)d + 4 GeV p ---> p + L* + K0 + p (~10 nb/sr) ( --> pL* + K0 + p ) --> ppK- + K0 + pmissing massppK---> p + Linvariant mass

  31. L1405=L* cascade reaction in 4HeInitial p + “n” --> L* + K0 + pL* + “ppn” --> L*pp + n --> pppK- + n“nK0” + “ppn” --> ppnK0 + n (“Kaon Transfer”) pppK----> p + p + L (invariant mass)L* + “ppn” --> L*pn + p --> ppnK- + p“pK-” + “ppn” --> ppnK- + p (“Kaon Transfer”) ppnK----> d + L (invariant mass) L* + “pn” --> L*p + n --> ppK- + nppK----> p + L (invariant mass) Small momentum transfer (soft landing) pppK- momentum (MeV/c) L1405 kinetic energy (MeV)

More Related