### Abstract

Differential cross sections, analyzing powers, and spin rotation parameters for elastic scattering of protons on ^{4}He at 297 MeV have been measured over a wide angular range (12°≤θ_{lab}≤66°). Experimental data have been microscopically analyzed with relativistic impulse approximation calculations. The spin observables up to medium scattering angles (θ_{c.m.}≤40°) are predominantly sensitive to the ratio of the volume integral of scalar density to vector density. With a ratio of 0.92, which is significantly smaller than those for heavier nuclei (0.96-0.98), both spin observables as well as the differential cross section have been quantitatively reproduced. According to nuclear matter calculations, the small ratio reflects a high mass density. At backward angles, the experimental cross sections are larger than any of the values calculated with realistic density distributions.

Original language | English |
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Article number | 034618 |

Pages (from-to) | 346181-3461811 |

Number of pages | 3115631 |

Journal | Physical Review C - Nuclear Physics |

Volume | 63 |

Issue number | 3 |

DOIs | |

Publication status | Published - Jan 1 2001 |

### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics

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## Cite this

^{4}He at 297 MeV.

*Physical Review C - Nuclear Physics*,

*63*(3), 346181-3461811. [034618]. https://doi.org/10.1103/PhysRevC.63.034618