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‘Centauro-I’ データ再解析

‘Centauro-I’ データ再解析. 近畿大学・理工 玉田　雅宣. 2004 年 11 月 5 日　 RCNP. チャカルタヤ宇宙線観測所 （海抜 5200m; Bolivia). Chacaltaya two-storey chamber (5200m a.s.l., Bolivia). some characteristics of the measurement. atmospheric family. E g , R g E h ( g ), R h. atmospheric family (A-jets).

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‘Centauro-I’ データ再解析

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  1. ‘Centauro-I’ データ再解析 近畿大学・理工 玉田　雅宣 2004年11月5日　RCNP

  2. チャカルタヤ宇宙線観測所（海抜 5200m; Bolivia)

  3. Chacaltaya two-storey chamber (5200m a.s.l., Bolivia)

  4. some characteristics of the measurement

  5. atmospheric family Eg, Rg Eh(g), Rh atmospheric family (A-jets)

  6. measuement of zenith angle & azimuthal angle family by microscope shower projection map

  7. Chacaltaya chamber no.15 Exposure : October 1969 ~ July 1970

  8. Chamber no.15 N=7(≥1TeV) : 27 TeV 50 cm N=138 (≥0.2TeV) : 203 TeV 40 cm

  9. CENTAURO : original data and interpretation 1~2 cm Nh~100, < pt > ~1.8 GeV/c , non-p0 production

  10. observed : Evis = 230 TeV correction for passing through Etot =320 TeV <kg> = 0.2 E0 =1,600 TeV Centauro-I : previous interpretation @ Interaction energy : E0 ~ 1,600 TeV @ Production height H ~ 50m @ Number of secondaries N ~ 100 @ Number of neutral pions Np0 ~ 0 @ pt of secondaries <pt>~1.8GeV/c geometrical convergence d~6mm, Dd~200mm @ Centauro fireball mass M~230GeV

  11. Serach for Centauro in CERN SppS Phys. Lett. B 180 (1986) 415 Phys. Lett. B 122 (1983) 415

  12. Serach for Centauro in TEVATRON FERMILAB-Conf-96/205-E FERMILAB-Conf-94/343-E

  13. re-analysis Shower-cluster in S55 is not an upper body of that in I12 !!

  14. Chamber no.15 50 cm 40 cm

  15. gap-passing atmospheric family ??

  16. atmospheric jet produced at 50m above the chamber ? V.V.Kopenkin et al.; PRD68(2003) 052007 CORSIKA/QGSJET impossible !!

  17. Atmospheric family of very small lateral spread ? ( narrow family ) Ng - <Rg> correlation (100<SEg<1,000TeV) atmospheric families observed in Chacaltaya chambers (~1/156) Simulations CORSIKA/QGSJET (~3/1,234)

  18. x, o ; Simulations : CORSIKA/QGSJET narrow family : ~6/6,216

  19. narrow familyが gapを通過する確率 ★ narrow family [ n(E≥2TeV)≥20 & <R>≤3mm ]の頻度 {100 TeV ≤SEobs < 1,000 TeV} Chacaltaya two-storey chamber : f = 1/156 ~ 6 x 10-3 CORSIKA/QGSJET : f = 6/6216 ~ 1 x 10-3 ★ gapが占める割合 　　　 : p = Sgap/S ~ 0.05 C15 upper chamberの全面積 : S = 44.2 m2 gapの全面積 　　　　　　 : Sgap= 2.44 m2 narrow familyが gapを通過する確率 f x p = (0.5 ~ 3) x 10-4

  20. C-jet with very large pt and multiplicity ? no geometrical convergence to target layer !!

  21. Comparison with showers in 13 C-jets in the event ‘Centauro-IV’ a bundle of C-jets ?

  22. Comparison with simulations : QGSJET model

  23. g-rays are decay productsof pi-zeros in target layer a bundle of C-jets !

  24. again very exotic !! a bundle of hadrons w/o accompanying g-rays no collisions in the upper chamber !! 158 cm ≥ 28 collisions In the target layer !!

  25. ★これまでの上下対応は間違い　 発生高度 H=50m (<pt> ~ 2 GeV/c) は決まらない． ★上段チェンバーに、対応するファミリーは見つからない． ★上段チェンバーのブロック間の隙間を通過した拡がりの非常に 　小さいγ線ファミリーか？ ◎完全には否定できないがその可能性は小さい！． ★大多重度、大Pt の C-jet か？ ◎カーボン層への有意な収斂は観測されない。 ★複数個の C-jets の重ね合わせ（hadron bundle) ? ◎エネルギー分布、Mgg-分布： ~30 のC-jets の重ね合わせでよく説明できる． ◎上段チェンバーにシャワーが観測されないというの 　は説明しにくい． ★新しい解釈が必要：strange quark matter ?

  26. strange quark matter L : explosion length of small strangelet in Pb l : collision mean free path of nucleons in Pb

  27. number of hadrons which interact in the upper chamber number of hadrons which interact in the upper chamber and target layer number of hadrons which interact in the target layer: I2 - I1

  28. Expected number of collisions in the upper chamber

  29. CASTOR: CMS/LHC Strange Quark Matter non-strange baryon strangelet unstable neutron bundle meta-stable evaporation of neutron SQM fireball A.Angelis et al.; J.Phys.G23(1997) 2069 E.Gladisz-Dziadus & Z.Wlodarczyk ; J.Phys.G23(1997) 2057

  30. TOTEM experiment at LHC nuclear interaction at E0 ~ 1017eV V.Avati et al.; EPJdirect A1(2003)1

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