Abstract
We have recently evaluated the quality of γ -ray angular distributions that can be extracted in particle-gamma coincidence measurements using the CHIMERA detector at LNS. γ -rays have been detected using the CsI(Tl) detectors of the spherical part of the CHIMERA array. Very clean γ -rays angular distributions were extracted in reactions induced by different stable beams impinging on 12 C thin targets. The results evidenced an effect of projectile spin flip on the γ -rays angular distributions. γ -particle coincidence measurements were also performed in reactions induced by neutron rich exotic beams produced through in-flight fragmentation at LNS. In recent experiments also the Farcos array was used to improve energy and angular resolution measurements of the detected charged particles. Results obtained with both stable and radioactive beams are reported.
Highlights
Large yields of various neutron rich and poor exotic beams, of energy ranging from 20 to 50 MeV/A, are available at LNS [1], and in particular we used 6,8He, 8,9Li, 10,11Be, 13B, 16,17C, 68Ni
The tagging system is based on the use of a 32x32 strips double side silicon strip detector (DSSSD) measuring the energy loss of the impinging beam particles
From comparison with GEANT-IV simulations, one understand that the energy response function is centered on the first escape peak at about 3.9 MeVee
Summary
Large yields of various neutron rich and poor exotic beams, of energy ranging from 20 to 50 MeV/A, are available at LNS [1], and in particular we used 6,8He, 8,9Li, 10,11Be, 13B, 16,17C, 68Ni. The tagging system is based on the use of a 32x32 strips double side silicon strip detector (DSSSD) measuring the energy loss of the impinging beam particles. An example of the obtained identification scatter plot is shown in fig.1 for the production of 16C and 10,11Be by the fragmentation of 18O 55 AMeV primary beam.
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