1 / 13

p p interaction in nuclear matter

p p interaction in nuclear matter. motivation experiments CB@MAMI 2004/05 conclusion Ralf Gregor II.Physikalisches Institut Giessen. 1535. 1520. 1260. 600. ≈ 290. ≈ 600. 1232. ≈ 490. ≈ 470. 938. 135. 770. vector mesons. chiral symmetry. scalar mesons. nucleon.

Download Presentation

p p interaction in 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. pp interaction in nuclear matter motivation experiments CB@MAMI 2004/05 conclusion Ralf Gregor II.Physikalisches Institut Giessen

  2. 1535 1520 1260 600 ≈ 290 ≈ 600 1232 ≈ 490 ≈ 470 938 135 770 vector mesons chiral symmetry scalar mesons nucleon pp interaction in nuclear matter motivation experiments CB@MAMI experiment 2004/05 chiral symmetry = fundamental symmetry of QCD (in the limit of vanishing quark masses) if chiral symmetry is valid on hadron level -> chiral partners (same spin, opposite parity) with the same mass should exist in nature chiral symmetry on hadron level broken

  3. pp interaction in nuclear matter motivation experiments CB@MAMI experiment 2004/05 V. Bernard et al. PRL 59 (1987) 966 T. Hatsuda et al., PRL 82 (1999) 2840   00, +- P. Schuck et al., nucl-th/0002031 R. Rapp et al., PRC 59 (1999) 1237 in the chiral limit masses of chiral partners degenerate

  4. pp interaction in nuclear matter motivation experiments CB@MAMI experiment 2004/05 A(p,p0p0) at 408 MeV/c A. Starostin et al., PRL 85 (2000) 5539 (Crystal Ball Collaboration) shift of invariant p0p0 - mass towards lower masses with increasing nuclear number (-> increasing effective nuclear density)

  5.  ↛ 0± blue curves scaled: (p±p0*0,7) A (,)   00 pp interaction in nuclear matter motivation experiments CB@MAMI experiment 2004/05 Eg = 400-500 MeV J. Messchendorp et al., PRL 89 (2002) 222302 F.Bloch, S.Janssen,M.Kotulla, S.Schadmand blue curves: P. Mühlich et al. O.Buß (giessen theory group)

  6. pp interaction in nuclear matter motivation experiments CB@MAMI experiment 2004/05 • difference between • p0p0 and p0p+/- • higher statistic necessary J. Messchendorp et al., PRL 89 (2002) 222302

  7. pp interaction in nuclear matter motivation experiments CB@MAMI experiment 2004/05 Eg = 400-450 MeV red curve: CB/TAPS@MAMI 05 blue points: TAPS@MAMI 99/00 J. Messchendorp et al., PRL 89 (2002) 222302 Eg = 400-450 MeV C lead/carbon (a.u.) Ca M(p0p0) (MeV) shift of 2p0-strength towards 2p0-threshold with increasing nuclear mass counts (a.u.) Pb no acceptance correction of the histograms M(p0p0) (MeV)

  8. pp interaction in nuclear matter motivation experiments CB@MAMI experiment 2004/05 charged pion identification protons PID-Hits DE [MeV]  E [MeV]

  9. pp interaction in nuclear matter motivation experiments CB/TAPS@MAMI experiment 2004/05 test of p+/p- identification g + p → h + p p+ + p- + p0

  10. pp interaction in nuclear matter motivation experiments CB@MAMI experiment 2004/05 Eg = 400-450 MeV red curve: CB/TAPS@MAMI 05 blue points: TAPS@MAMI 99/00 J. Messchendorp et al., PRL 89 (2002) 222302 Eg = 400-450 MeV C lead/carbon (a.u.) Ca M(p0p+/-) (MeV) counts (a.u.) Pb no acceptance correction of the histograms

  11. p0p0 (Eg=400-450MeV) p+/-p0 (Eg=400-450MeV) pp interaction in nuclear matter Pb/Ca Ca/C Pb/Ca Ca/C Ratios for neutral channels Ratios for charged channels Pb/C Pb/C

  12. pp interaction in nuclear matter motivation experiments CB@MAMI experiment 2004/05 Lead-Carbon Eg = 400-450 MeV p0p0 p0p+/- M(pp) (MeV) difference between 2p0 und p±p0 channel confirmed

  13. pp interaction in nuclear matter summary reaction g A p p X measured high statistic with CB@MAMI (improvement about factor 60) 2p0 – channel for C, Ca, Pb shown first p±p0 – channel results next steps: better cuts D, Li –Targets simulation (normalisation) comparison with theory

More Related