Pr

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Fields of interest, tools, perpectives

• Collective excitations in fermionic systems
  giant resonances in exotic nuclei, shell
  structure evolution, (fermionic atoms)
• Pairing phase transition, Giant Pairing
  Vibrations
• Application to astrophysics r process, neutron
  star crust, ultra-high energy cosmic rays
• Mean field QRPA Skyrme, coordinate
  representation
• Direct reactions DSSSD, active targets, proton
  scattering
• Bubbles in exotic nuclei, detection of the GPV,
  relativistic approaches, GMR in neutron-rich
  nuclei,

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First measurement of the GMR and the GQR in an
unstable nuclei 56Ni
C. Monrozeau, E. Khan, Y. Blumenfeld et al.,
Phys. Rev. Lett. 100 (2008) 042501
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Motivations exotic modes ?

• Few measurements on GR in unstable nuclei
  IVGDR

• GQR and GMR soft modes are predicted !

Terasaki et al, Phys. Rev. C71 (2006) 34310
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Motivations equation of state
Nuclear equation of state
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Experimental probes for isoscalar giant
resonances
Inelastic scattering (d,d) (a,a) _at_ E ? 25
A.MeV
58Ni (a,a) Ea240 MeV
D.H. Younblood et al, Phys. Rev. Lett 76, 1429
(1996)
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ISGMR in unstable nuclei
unstable nuclei
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Experimental setup
56Ni _at_ 50 MeV/A 5.104 pps

• July 2005, GANIL
• SISSI beam

Ionisation chamber
Drift chamber
Si wall
Moving flap
CsI wall
Au foil
Diamond
56Ni (5.104 pps) 50 A.MeV contaminants
MAYA
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Results
56Ni excitation energy spectrum
recoiling d kinematics
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Analysis with gaussian fit
Counts/MeV
E (MeV)
Reaction DWBA with double folding using HF and
RPA 56Ni gs and transition densities
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Multipole Decomposition Analysis
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Summary outlooks

• Isoscalar GMR and GQR measured in the 56Ni
  unstable nucleus
• Use of MAYA active target with d gas
• 16h of 104 pps beam
• Results compatible with the 58Ni (stable) data
• The method works !
• Improvements identification d breakup,
  reaction model
• Next neutron rich Ni isotopes, 132Sn
• ACTAR active target

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Collaboration
C.Monrozeau1, E.Khan1, Y. Blumenfeld1,
C-E.Demonchy3,W. Mittig5, P.Roussel-Chomaz5
D.Beaumel1, M.Caamaño2,D.Cortina-Gil2,J.P. Ebran1
N.Frascaria1, U.Garg4, M.Gelin5, A.Gillibert6,
D.Gupta1, N. Keeley6, F.Maréchal7, A.Obertelli6,
J-A.Scarpaci1   1 Institut de Physique Nucléaire
(IN2P3/CNRS), 91406 Orsay Cedex, France 2 Univ.
Santiago de Compostela, E-15706 Santiago de
Compostela, Spain 3 Univ. of Liverpool, Dep. of
Physics, Olivier Lodge Lab., Liverpool L69 7ZE,
U.K. 4 Univ. of Notre-Dame, Dep. of Physics,
Notre Dame, IN 46556 USA 5 GANIL (DSM/CEA,
IN2P3/CNRS), BP 5027, 14076 Caen Cedex 5,
France 6 CEA/DSM/DAPNIA/SPhN, Saclay, 91191
Gif-sur-Yvette Cedex, France 7 Institut de
Recherches Subatomiques (IN2P3/CNRS), BP 28,
67037 Strasbourg, France
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Motivations K8
Microscopic method
Skyrme Gogny K? 235 ? 12 MeV Relativistic
MF K? 250 270 MeV
N.B. macroscopic method needs data on the
nuclear chart
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56Ni(d,d) with the active target MAYA
56Ni unstable (106 pps _at_ GANIL) A NEW
EXPERIMENTAL METHOD
2H gas
2H gas
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First measurement of isoscalar giant resonances
in an unstable nucleus

• Primary 58Ni, 75 MeV/A, 0.7 kW (July 05)
• target C (78 mg/cm2) SISSI
• Secondary 56Ni, 50 MeV/A, 5.104 pps

56Ni(d,d)
56Ni excitation energy spectrum