Diapositiva 1

1
Study of the anomalous quadrupole properties of
104,106,108Sn through proton inelastic
scattering Zs. Dombradi1, A. Obertelli2, J.
Gerl3, A. Algora4 et al 1ATOMKI, Debrecen,
Hungary 2CEA, Saclay, France 3GSI, Darmstadt,
Germany 4IFIC (CSIC-Univ. of Valencia, Valencia,
Spain
2
The problem B(E2) in light Sn isotopes seems to
be larger than expected
3
Aim of the proposal determination of neutron
effective charge through an analysis of the cross
sections of the Coulomb excitation and proton
inelastic scattering processes
??n
bsensitivity of the probe to protons and
neutrons, ?deformation length
Large deviation of the ?n/?p ratio from 1 is an
indication for change of the effective charge
4
The Carbon case
Neutron deformation is much larger than the
charge one ? neutron effective charge is
small This is reflected in the proton and neutron
transition probabilities
Weakly bound neutrons decouple from the
core Elekes et al., PRC 79, 011302(R) (2009)
5
Is this an AGATA_at_GSI specific project?
Yes for the moment only GSI can provide the
beams required .... but in a year RIKEN may
produce beams of 2 orders of magnitude higher
intensity and there is the high
resolution ZeroDegree spectrometer behind the
target to separate the reaction
products
Due to the small cross section of the (p,p')
scattering the high sensitivity of AGATA is
required Due to the high background in inelastic
scattering of heavy nuclei the high resolution
of AGATA is a great advantage