Radial excitation of the nucleon to the P sub 11 (1440 MeV) resonance in alpha-proton scattering

• Published in: Physical review letters Vol. 69:9
• Main Authors: Morsch, H.P., Boivin, M., Jacobs, W., Plouin, F., Spang, W., Yonnet, J., Zupranski, P., Frascaria, R., Siebert, R., Warde, E., Didelez, J.P., Saghai, B., Tegner, P.E.
• Format: Journal Article
• Language: English
• Published: United States 31-08-1992
• Subjects: ALPHA REACTIONS; BARYONS; BOSONS; CHARGED-PARTICLE REACTIONS; COMPOSITE MODELS; CROSS SECTIONS; DATA; DIFFERENTIAL CROSS SECTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; EXPERIMENTAL DATA; FERMIONS; GEV RANGE; GEV RANGE 01-10; HADRONS; HYDROGEN 1 TARGET; INELASTIC SCATTERING; INFORMATION; MATHEMATICAL MODELS; MESONS; MISSING-MASS SPECTRA; N BARYONS; N-1440 BARYONS; NUCLEAR PHYSICS AND RADIATION PHYSICS; NUCLEAR REACTIONS; NUMERICAL DATA; PARTICLE MODELS; PERTURBATION THEORY; PIONS; PSEUDOSCALAR MESONS; QUARK MODEL; SCATTERING; SPECTRA; TARGETS 663440 > D-, T-, & He-induced Reactions & Scattering > (1992-)
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.69.1336

The energy region from the {pi} threshold up to the Roper resonance {ital N}(1440) has been investigated in inelastic {alpha} scattering on hydrogen using {alpha} particles from SATURNE with a beam momentum of 7 GeV/{ital c}. In addition to projectile excitation, excitation of the {ital P}{sub 11}(1440 MeV) resonance has been observed for the proton, indicating a strong monopole excitation. From this a value of the nucleon compressibility of 1.4{plus minus}0.3 GeV is extracted.