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Krasznahorkay, M. Csatls, J. Gulys, M. Hunyadi, Z. Mt, B.M.
Nyak, D. Sohler, L. Zolnaifor the ATOMKI, KVI, RCNP, INFN
collaborationNothing tends so much to the advancement of knowledge
as the application of a new instrument. -- Sir Humphrey Davy
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History of the collaborationPostdoctoral position at KVI (AK,
1989,1990)GR studies with magnetic spectrographsA split-pole
magnetic spectrograph as a presentNWO + OTKA supportStudy of HD
states in Debrecen, + collaboration also with LMUPostdoc position
at KVI (MH, 2000,2001)NWO-OTKA (1994-2002, 49
publications)2002-2007 + 30 common publications.
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Electric Giant
Resonances19481971197719801983MonopoleDipoleQuadrupoleIsoscalarIsovector
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Experimental determination of the neutron-skin
thicknessneutronsprotons
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The GDR methodHatskeresztmetszet szmolsok a GT s SJ modell
alapjn
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The experimental setup
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Final state spectra
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Final state spectra for the 208Pb(, ) reaction
NaI det.Clover det.
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Determination of the neutron-skin thickness of 208Pb
GDR results 0.120.07 fmG.W. Hoffmann et al., Phys. Rev C21
(1980) 1488 0.140.04 fmTrzcinska et al., Phys. Rev. Lett. 87 (2001)
82501 0.150.03
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Trzcinska et al., Phys. Rev. Lett. 87 (2001) 82501
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Vibrations in the spin-isospin space: Sum rule for the SDR
strengthA. Krasznahorkay et al., Phys. Rev. Lett. 82 (1999)
3216.
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114-124Sn(3He,t) at E= 400 MeVat RCNP, Osaka
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(p,p)GDRSDRA. Krasznahorkay et al., Phys. Rev. Lett. 82 (1999)
3216.
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Experimental methodsBBSE=177 MeV=3.2o
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Differential cross sections
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Our results obtained with the SDR method
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Isovector GRs 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: 1 MeV resolution in Ex required: 10 En /En = 10 %
flight path: 1 m, Timing resolution: 1 ns
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(p,n) in inverse kinematics p(132Sn,n) E=400 AMeV
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The ELENA setupType of the scintillator: UPS-89 = NE102ASyze of
the scintillator: 10x45x1000 mmPMTs: XP2262 + active dividers
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Monte-Carlo simulations
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Conclusions
GR studies in stable beamsGR studies in RIBsChallenges for the
detectors
