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Heavy-Ion Physics at J-PARC Shoji Nagamiya RIKEN / KEK / JAEA

Explore the possibilities of high-density physics at J-PARC, involving neutron stars, hypernuclei, and multi-strangeness production. Investigate the evolution of matter in the universe, from supernova explosions to quark matter. Discuss the current facilities, future prospects, and competition for funding.

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Heavy-Ion Physics at J-PARC Shoji Nagamiya RIKEN / KEK / JAEA

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  1. January 20, 2016 Tokai Heavy-Ion Physics at J-PARC Shoji Nagamiya RIKEN/ KEK / JAEA 1) Motivation 2) J-PARC vs. FAIR

  2. First ET Data from AGS and SPS ET Spectra from an early days of AGS The nucleus seems black at the AGS energy ET Spectra from an early days of SPS

  3. Possibility for High Density Formation

  4. Temperature vs. Baryon Density LHC RHIC STAR’s BES FAIR NICA?J-PARC? Neutron star

  5. Multi-Strangeness Hypernuclei? _ |S| > 3 Hypernuclei • Full intensity beam of 1011/s is ~10 MHz central collisions • 10-5 for 106 events means dN/dy = 10--4 = 0.3 events/hour Very marginal but not impossible S=-1 Hypernuclei Pb + Pb Central collision S=-2 Hypernuclei |S| > 3 Hypernuclei FAIR or J-PARC _ 10-5 A. Andronic, PLB697 (2011) 203

  6. n Neutron Matter Superfluid L n Strange Hadronic Matter High density nuclear matter with hyperons (strange quarks) p Quark Matter Deconfined quarks Color superconductivity X Mystery of neutron star matter Slide from H. Tamura • Final form of matter evolution in the universe Produced by supernova explosion, Observed asX-ray pulsars • Highest density matter in the universe M = 1~2 M, R ~ 10~20 km =>Density of the core = 3~10r0 （1～3 Btons/cm3） r0: nuclear density Nuclear “Pasta” • Various forms of matter made of almost only quarks Nuclear + Neutron Matter ?? ? High density formation may help multi-strangeness production

  7. Possible Ideas for Fixed Target Normal magnet Very strong magnet Primary Protons p Primary Beam Detector for stable object Primary Neutrons p- Primary Beam Search of strangeness related objects Lepton pairs Primary Beam Search for lepton pairs + many other ideas ….

  8. Recent Scheme by the Accelerator Team ~ 1011/s Existing

  9. J-PARC Facility Hadron Beam Facility Materials and Life Science Experimental Facility Nuclear Transmutation (Phase 2) ５００ｍ Neutrino to Kamiokande 3 GeV Synchrotron (25 Hz, 1MW) 50 GeV Synchrotron (0.75 MW) Linac (330m) J-PARC = Japan Proton Accelerator Research Complex Joint Project between KEK and JAEA

  10. J-PARC vs. FAIR • FAIR • FAIR has good supportby over 1000 people, but may fail its funding. Surely, it is delayed. In addition, synchrotron??? • J-PARC • Only front-end (linac + booster) addition is needed. • It already has high-intensity capability at both RCS and MR. • In addition, even two facilities (J-PARC and FAIR) exist, we have strong experimental and theoretical teams in Japan. • J-PARC-HI requires, however, multi processes: ① J-PARC → ② Japanese Nuclear Physics Committee → ③ Science Council of Japan → ④ MEXT+Funding • In each process, there are serious competitions(In October no processes existed, but in January process ① started and the process ② will also start). Let us to proceed to further stages for J-PARC ASAP.

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