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Serguei Sadovsky , IHEP, Protvino EMIN-2009, Moscow, 19 September 2009

Study of Electromagnetic Interactions of Light Ions in the Framework of the IHEP Ion Program at U70. Serguei Sadovsky , IHEP, Protvino EMIN-2009, Moscow, 19 September 2009 . Outlook. IHEP accelerators Positroniy channel Possible physics domains Conception of experimental setup

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Serguei Sadovsky , IHEP, Protvino EMIN-2009, Moscow, 19 September 2009

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  1. Study of Electromagnetic Interactions of Light Ions in the Framework of the IHEP Ion Program at U70 Serguei Sadovsky, IHEP, Protvino EMIN-2009, Moscow, 19 September 2009

  2. Outlook • IHEP accelerators • Positroniy channel • Possible physics domains • Conception of experimental setup • Conclusion

  3. Сессия-конф. СЯФ ОФН РАН IHEP accelerators Linac I100 Linac U30 Buster U1.5 U70 accelerator

  4. Linac for light ion acceleration: I100 p, d ion source HV generator Up to +750 кV TOF: ЦФ 3 м 2008 2008 50 mА p p d N2+,O2+ 100 ns 15 mАd5 mks 16.7 MeV/n p N+, O+ N2+,O2+

  5. Light ion source: I100 (laser source of 12C)‏ IHEP laser (CO2, 2.7 J, 10 m, 0.25 Hz)‏ IGP of RAS laser (…, 10 Hz)‏ 40 mA @ entry toI100 Beam of C5+ 1.6 mA @ exit from I100

  6. Light ions: channel from I100 to U1.5 17.11.06: p 72.7 MeV 01.12.06: d 16.7 MeV/n

  7. Light ions: December 2008 10–12.12.08; d; 16.7–> 455 MeV/n d in U70 after 4 magnets April 2009: d-beam circulation in U70

  8. Ion beam extraction from U70 5 mm 5mm Ions in U70 NB0 proton p (U30) 1.71013 proton p( I100 ) 2-91011 deuteron d 11011 carbon 12C6+ 3109 Si crystal station

  9. Proposal to study the ion beam extractions in «Positroniy» channel

  10. Experimental area of «Positroniy»channel: two beam magnets and one of two secondary targetsare proposed to install, the available Z distance is 15 m M1 tg1 M2 tg2

  11. Up to 106 12С/cicle in «Positroniy» channel is expected due to beam extraction with Si Crystal Ions in U70 NB0 proton p 1.71013 proton p 2-91011 deuteron d 11011 carbon 12C6+ 3109 Extraction efficiency is 0.1% Crystal bended angle ~ 60 mrad Extraction efficiency vs banded angle

  12. Intensities of secondary radioactive beams in 12С fragmentation fragment Life- time σ (12C + 12C) → fragment (mb)‏ Rigidity GeV/c)‏ Momen-tum (GeV/c)‏ Ions per cycle 11C 20,3 m 53 60,5 363 2,0E+07 10C 19,3 s 2 55 330 7,4E+05 9C 126 ms 0,2 49,5 297 7,4E+04 11B stable 70 72,6 363 2,6E+07 10B stable 38 66 330 1,4E+07 8B 770 ms 1,4 52,8 264 5,2E+05 10Be 1,6 106 y 6 82,5 330 2,2E+06 9Be stable 10 74,25 297 3,7E+06 7Be 53 d 12 57,75 231 4,4E+06 9Li 178 ms 0,5 99 297 1,9E+05 8Li 840 ms 2,4 88 264 8,9E+05 7Li stable 7 77 231 2,6E+06 6Li stable 4 66 198 1,5E+06 8He 119 ms 0,035 132 264 1,3E+04 6He 807 ms 2 99 198 7,4E+05 4He stable 50 66 132 1,9E+07 3He stable 5 49,5 99 1,9E+06 3H 12,3 y 5 99 99 1,9E+06 The secondary beam optics allows to have beams of different radioactive nuclei At the intensity of 12C primary beam I=3·109 /cycle the fragment intensities variate from I=106 /cycle for 8Li and to I=104 /cycle for 8He Important: the fragments have different rigidity => fragments identification with Spectroscopic magnet is possible

  13. Physics case 1: study of light nuclei at the limit of neutron stability

  14. Light nuclei beyond the neutron stability

  15. PHYSICS case 2:Nuclear Clasteringof the 12С fragments, including short-leaved and exotics nuclei P.Zarubin, JINR LINC-2008 6He 807 ms 9Li 178 ms 8Li 838 ms 8He 119 ms can be studied at U70

  16. Nuclear Clustering P.Zarubin, JINR LINC-2008 can be studied at U70

  17. Angular distribution of fragments without spectroscopic magnet V.V.Glagolev at al. 2001 16O + p -> 4He + X at 3.25 AGeV/c Θ(25AGeV) ~ Θ(3.25AGeV)*3.25/25 =>RFr > 1.7 cmat Z = 15 m

  18. PHYSICS case 3: phase transition in a cold nuclear matter ? T 109 K Liquid Gas Excitation energy per nucleon, MeV

  19. PHYSICS case 4: neutral meson photoproduction in AA-collisions b) photoproduction Coherence condition in the inverse kinematics: -q2 < 1/Rtarget, i.e. Eγ < γ/Rtarget = γ/1.2A1/3

  20. Inverse kinematics of neutral meson photoproduction in the AA-collisions Eγ(max) = γ/1.2A1/3 for 12C + 56Fe -> meson+X = and 25 AGeV/c 12C beam Ethr ~Eγ(max)~mmesonγ = 26.6 Eγ(max) = 1140 MeV Thus π0, η, ω , φ photoproduction is possible in the reaction 12C + 56Fe -> meson+X at 25 AGeV/c The meson energy in the Lab frame is as follows: Emeson > γ mmeson, i.e. E(π) > 3.6 GeV E(η) > 14.6 GeV E(ω) > 20.8 GeV E(φ) > 27.1 GeV

  21. Setup conception for the light ion fragmentation studies in ion-ion EM-interaction LGD2 Magnet target S2 S1 PSD Beam MWPC3 MWPC2 MWPC1 MWPC4 Plastic Ball MWPC6 MWPC5 TrigBm = S1*S2*EPB(E<Ethr1)*EPSD(E<Ethr2)‏ TrigTg = S1*S2*EPB(E>Ethr1)*EPSD(E>Ethr2)‏ UrQMD simulation: C+C at 25A GeV/c, Total pz of beam fragments in lab

  22. WA98 plastic ball: fragment detection in the target reference frame

  23. Beam hole X A.P.Ivashkin 2008, INR RAN Projectile Spectator Detector (PSD@CBM) for detection of the beam fragmentation Transverse sizes ~1x1 m2; Distance from target - 15 m; Number of modules – 107; Module dimensions – 10x10x160 cm3 Z Spectator spots at Z=15m, EAu=15 AGeV, simulation

  24. PSD for CBM, design, construction and beam test results: A.P.Ivashkin 2008, INR RAN • Modular Lead/Scintillator sandwich compensating calorimeter • Sampling ratio Pb:Scint=4:1 • Expectation: For thickness δPb=16 mm and δScint=4 mm σE/E ~ 50%/√E • 60 lead/scintillator sandwiches. • 10 longitudinal sections • 6 WLS-fiber/MAPD measurements MAPDs and amplifiers

  25. Spectroscopic magnet in the experimental aria of the “Positroniy” channel (JINR)‏ and DC

  26. Lead Glass Detector LGD2 (IHEP, Hyperon setup)‏

  27. Conclusion • Ion beams at U70 accelerator are expected for users in 2010-2011 • The expected intensity of 12C beam in “Positroniy” channel is up to 106/cycle • Different radioactive light ion beams can be created on the base of carbon beam with momentum of 25-30 AGeV/c • An essential part of experimental equipment exists and could be used in the future experimental setup for 12C+A interaction studies • This opens several quite interesting physics domains for experimental studies, including light nuclei at the limit on neutron stability, EM fragmentation of light radioactive nuclei, phase transition in a cold nuclear matter and neutral meson photoproduction • Welcome to participate in the experiment

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