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Krasznahorkay, M. Csatlós, J. Gulyás, M. Hunyadi, Z. Máté, B.M. Nyakó, D. Sohler, L. Zolnai

GIANT RESONANCES, NEUTRON SKIN. Krasznahorkay, M. Csatlós, J. Gulyás, M. Hunyadi, Z. Máté, B.M. Nyakó, D. Sohler, L. Zolnai for the ATOMKI, KVI , RCNP, INFN collaboration. Nothing tends so much to the advancement of knowledge as the application of a new instrument. -- Sir Humphrey Davy.

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Krasznahorkay, M. Csatlós, J. Gulyás, M. Hunyadi, Z. Máté, B.M. Nyakó, D. Sohler, L. Zolnai

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  1. GIANT RESONANCES, NEUTRON SKIN • Krasznahorkay, M. Csatlós, J. Gulyás, M. Hunyadi, Z. Máté, • B.M. Nyakó, D. Sohler, L. Zolnai • for the ATOMKI, KVI, RCNP, INFN collaboration Nothing tends so much to the advancement of knowledge as the application of a new instrument. -- Sir Humphrey Davy

  2. History of the collaboration • Postdoctoral position at KVI (AK, 1989,1990) • GR studies with magnetic spectrographs • A split-pole magnetic spectrograph as a present • NWO + OTKA support • Study of HD states in Debrecen, + collaboration also with LMU • Postdoc position at KVI (MH, 2000,2001) • NWO-OTKA (1994-2002, 49 publications) • 2002-2007 + 30 common publications.

  3. Electric Giant Resonances Isoscalar Isovector 1977 1983 Monopole Dipole 1948 1971 1980 Quadrupole

  4. Experimental determination of the neutron-skin thickness neutrons protons

  5. The GDR method    Hatáskeresztmetszet számolások a GT és SJ modell alapján

  6. The experimental setup

  7. Final state spectra

  8. Final state spectra for the 208Pb(, ’) reaction NaI det. Clover det.

  9. Determination of the neutron-skin thickness of 208Pb GDR results 0.12±0.07 fm G.W. Hoffmann et al., Phys. Rev C21 (1980) 1488 0.14±0.04 fm Trzcinska et al., Phys. Rev. Lett.87 (2001) 82501 0.15±0.03

  10. Trzcinska et al., Phys. Rev. Lett.87 (2001) 82501

  11. Vibrations in the spin-isospin space: Sum rule for the SDR strength A. Krasznahorkay et al., Phys. Rev. Lett. 82 (1999) 3216.

  12. 114-124Sn(3He,t) at E= 400 MeVat RCNP, Osaka

  13. (p,p) GDR SDR A. Krasznahorkay et al., Phys. Rev. Lett. 82 (1999) 3216.

  14. Experimental methods BBS E=177 MeV =3.2o

  15. Differential cross sections

  16. Our results obtained with the SDR method

  17. Isovector GR’s in unstable nuclei -The physics case • Macroscopic & microscopic info • Neutron skin • SDR sum-rule • Ex(GTR)-Ex(IAS) • astrophysics e.g. -process • Experimental considerations ((p,n) in inverse kinematics) • High cross sections (~10mb/sr) • Complete kinematics (use FRS) • low-En, no energy loss in target • Neutron detection • aim: 1MeV resolution in Ex • required: 10 En /En= 10 % flight path: 1 m, Timing resolution: 1 ns

  18. (p,n) in inverse kinematicsp(132Sn,n) E=400 AMeV

  19. The ELENA setup • Type of the scintillator: UPS-89 = NE102A • Syze of the scintillator: 10x45x1000 mm • PMTs: XP2262 + active dividers

  20. Monte-Carlo simulations

  21. Conclusions • GR studies in stable beams • GR studies in RIB’s • Challenges for the detectors

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