Precision measurement of the 9.641 MeV, 3<SUP>-</SUP> state in <SUP>12</SUP>C

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Isoscalar quadrupole strength in Ca-40 from the (p,p 'alpha(0)) reaction at E-p = 100 MeV

The Ca-40(p,p'alpha) reaction has been studied at an incident proton energy E-p,= 99.5 MeV for proton laboratory scattering angles Theta(p)(lab) = 17 degrees, 23 degrees and 27 degrees. Emission of alpha particles coincident with the scattered proton has been measured for an angular range Theta(alpha), similar or equal to 0 degrees - 180 degrees relative to the recoil axis. A multipole decomposition for the alpha(0)-decay channel to the Ar-36 ground state has been performed from the angular-correlation functions. The energy distribution of the dominating E2 strength deduced in the excitation energy range E-x = 11-21 MeV agrees reasonably well with the results from electron and alpha-induced alpha(0)-decay investigations. The exhaustion of the E? energy weighted sum rule in this channel up to an energy of 17 MeV is 16.1(4.0)%, in accord with the study of the (alpha, alpha' alpha(0)) reaction. However, this value is twice what is found in the (e,e' alpha(0)) experiment in the same energy region. Thus, the puzzling discrepancy in the E2 strengths derived from electromagnetic and hadronic probes remains unsolved. (C) 1998 Elsevier Science B.V

No evidence of an 11.16 MeV 2+ state in 12C

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Cluster States in C-12 and C-14

International audienceThe cluster structure of 12C is explored and recent measurements of proton inelastic scattering, suggesting a 2+ state close to 9.6 MeV are presented. Resonant scattering studies of 10Be + 4He used to populate resonances in 14C are briefly discussed

CLUSTER STATES IN C-12 AND C-14

The cluster structure of C-12 is explored and recent measurements of proton inelastic scattering, suggesting a 2(+) state close to 9.6 MeV are presented. Resonant scattering studies of Be-10+He-4 used to populate resonances in C-14 are briefly discussed

Deformation dependence of the isovector giant dipole resonance: Theneodymium isotopic chain revisited

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