Abstract
Charge exchange reactions have been investigated at Saturne with various projectiles (3He, \(\vec d\), 12C,16O, 20Ne, 40Ar) and incident energies between.5 and 1.1 GeV/nucleon1. These experiments have given clear indication of the selectivity of charge exchange reactions for spin isospin excitations. In particular, a strong excitation of the Δ resonance shows up for energy transfers higher than the pion mass. The most striking common feature of all these charge exchange reactions is a shift of about 70 MeV between the positions of the Δ bump on nuclei and on hydrogen targets (fig.1). This result has been interpreted by theoreticians as a collective effect in the spin longitudinal channel2 and has been quantitatively reproduced by recent calculations3. An alternative qualitative explanation is the projectile excit ation4.
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Ramstein, B. et al. (1991). Study of Decay and Absorption of Δ Resonance in Nuclei with a 4π Detector. In: Wissink, S.W., Goodman, C.D., Walker, G.E. (eds) Spin and Isospin in Nuclear Interactions. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3834-9_9
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DOI: https://doi.org/10.1007/978-1-4615-3834-9_9
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