Roper excitation in $\vec{p}+α\to \vec{p}+α+X$ reactions

Details Roper excitation in $\vec{p}+α\to \vec{p}+α+X$ reactions Roper excitation in $\vec{p}+α\to \vec{p}+α+X$ reactions

1998-12-19

arxiv.org/abs/nucl-th/9812054v1

Phys.Rev. C59 (1999) 1735-1742

Physics

Nuclear Physics

Nuclear Theory

12 pages, 11 ps figures, Latex

Scientific paper

10.1103/PhysRevC.59.1735

We calculate differential cross sections and the spin transfer coefficient $D_{nn}$ in the $\vec{p}+\alpha \to \vec{p}+\alpha+\pi^0$ reaction for proton bombarding energies from 1 to 10 GeV and $\pi^0 - p$ invariant masses spanning the region of the N$^*$(1440) Roper resonance. Two processes -- $\Delta$ excitation in the $\alpha$-particle and Roper excitation in the proton -- are included in an effective reaction model which was shown previously to reproduce existing inclusive spectra. The present calculations demonstrate that these two contributions can be clearly distinguished via $D_{nn}$, even under kinematic conditions where cross sections alone exhibit no clear peak structure due to the excitation of the Roper.

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