Nuclear Reactions as a Tool for Structure Studies of Exotic Nuclei
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Nuclear Reactions as a Tool for Structure Studies of Exotic Nuclei
H. Lenske
Institut für Theoretische Physik U. Giessen
• Low Energy Transfer Reactions
• Charge Exchange Reactions
• Fano-Resonances in Exotic Nuclei
• (Antiprotons as Probes for Neutron Skins)
• Summary and Outlook
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Extraction and Extrapolation of Spectral Information, Location of
Driplines, -Decay, Reaction Rates … : Reaction Theory!
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• Direct Reaction• Suppression of Compound Reactions• Particle Detection plus ray Detection• Spectral Distributions, Continuum
Transfer Reactions with Secondary Beams: Pickup/Stripping in Inverse Kinematics
H.L., G.SchriederEur.Phys.J. A2 (1998) 41
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Low Energy Transfer Reactions with Exotic Nuclei
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The 9Li+d 8Li+t Reaction @ REX-ISOLDE Data Tlab=2.36 AMeV
H.Jeppesen et al. , PLB (2006)
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The 9Li+d 8Li+t Reaction @ REX-ISOLDE Theory and Data Tlab=2.36 AMeV
H. Jeppesen et al., PLB (2006)
C2S=0.89
C2S=0.34
C2S=1.33
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Theory: 9Li+d 10Li+p @ Tlab=2 AMeV
10Li 9Li + n: Spectroscopy in the Continuum
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Reaction Mechanism of 2n-Transfer
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Two-Neutron Transfer Reactions
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11B(7Li,7Be)11Be Reaction at Tlab=57 MeV
Experiment by the Catania Group at IPN-Orsay Tandem Lab
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TEGTES )(Im
1)(
)()()()( 00 EVGEGEGEG
2121)()(
VVV
and CE Response by Continuum QRPA: Dyson Equation and Multipole Response
Functions
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QRPA Fermi-type Beta-Response
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QRPA GT-type Beta-Response
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F. Cappuzzello, H.L. et al, NPA 739 (2004) 30
DWBA-Analysis of 11B(7Li,7Be)11Be at Tlab=57MeV
33 )2/(),()()(),(
prpppr iNNAa eEtpdEF
11B(7Li,7Be)11Be(1/2+,g.s.) 11B(7Li,7Be)11Be(5/2+,1.77)
33
1,0)2/(),()()(),(
prpppr i
NNAaopt eEtpdEU
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11B(7Li,7Be)11Be Reaction at Tlab=57 MeV:NN Interactions and Cross Section
33 )2/(),(),()()(),(
prppppr iTNN
CNNAa eEtEtpdEF
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The Neutron Halo in 19C:Transition from Mean-Field to Correlation
Dynamics
The DCP picture: Binding by Polarization Potential
H.L.,J. Prog.Part.Nucl. 561 (2003);C. Nociforo, H.L., Nucl.Phys (2006)
The s.p. shell model picture: Static Potential
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√<r2>(1/2+) = 5.34 fm
S = 0.40
Shape and Size of 19C and 16O
√<r2>(1/2-) = 2.96 fm
S = 0.97
z
(x,y)
19C18C+n at Tlab=910AMeV on a
C-Target:
theo =69MeV/c
exp =68±3MeV/c
(-1n,theo)=192mb
(-1n,exp )=233±51mb
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Correlation Dynamics in the Continuum: Fano-Resonances in 15C
~60…140keV
S. Orrigo, H.L., PLB (2006) in print
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Summary and Outlook
• Nuclear Structure Nuclear Reactions
• Reaction Theory far off Stability
• Reaction Dynamics
• Elastic Channels Optical Potentials
• New Phenomena: Fano Resonances …
• Continuum Dynamics
• to be addressed: optical Potentials, Transition Form Factors, Reactions at Relativistic Energies (FAIR)
Contributors:
Sonja Orrigo, Nadia Tsoneva, Chiara Nociforo, F. Cappuzzello, C. Keil
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The Binding Energy of Ni-Isotopes: HFB Binding
Energies
Non-relativistic HFB Calculations(D3Y G-Matrix: DME with 3-body forces)
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Measuring Neutron Skins along Isotopic Chains (Ni,Sn…):
p + A Absorption at FAIR – AIC Proposal
P. Kienle, NMB 214 (2004) H.L., P. Kienle, nucl-th/0502065; PLB (2006)
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Measuring Neutron Skins (Ni,Sn…): Antiproton Absorption on Exotic
Nuclei
H.L., P. Kienle, PLB (2006); nucl-th/0502065
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(7Li,7Be) CE X-Sections and Beta-Response