Differential Cross Sections for the Scattering of Medium Energy Protons on Carbon

The proton-proton polarization has been measured at 16.2±0.2 Mev and 25 degrees in the laboratory system, using the familiar double-scattering method, with hydrogen gas as second scatterer. Instrumental asymmetries were practically eliminated by using carbon and copper alternately as first targets. The polarization was found to be + (Q.6=b0.5)%. Theoretical implications of the work are discussed.

Section: Pn(a)-pn(b) = Ae(a)\mentioning

confidence: 73%

Proton-Proton Polarization at 16 Mev

Blanpied

1959

“…Predicted reaction cross sections at 2^=10.5 MeV and E p~ 29 MeV are 492 and 297 mb, compared with measured values 332±19 and 418±18 mb, and the values 854 and 634 mb, calculated from Rosen parameters. [39][40][41] In Figs. 2 and 3, values for Pd, P y calculated with neutron and proton potentials modified as above are shown for the reaction C l2 (d, p) C 13 (g.s.)…”

Section: B Anomaliesmentioning

confidence: 98%

Study of the ReactionC12(d, p)C13with the Weak

Pearson

Wilcott

1969

Predictions of the weakly-bound-projectile model are compared with measured differential cross sections, polarization, and vector-analyzing power for the reactions C 12 (d, p)C ls {g.s.) at deuteron energies between 7.0 and 26 MeV, and C 12 {d, p]) C 13 *(3.09 MeV) between 10 and 15 MeV. All the measurements are accounted for without any compound-nucleus resonance effects. It is suggested that previous failures to fit such data with the distorted-wave Born approximation stemf romits inadequate description of the stripping mechanism.

“…The cross section due solely to the neutron interaction would be, for the f -> f transition, da "d* n " 18 -= -z(h\J2(SK P /9)\f 1 ) 2 , dtt dtt 175 (19) which is to be contrasted with the cross section with only alpha interaction, Eq. (12) and Table I.…”

Section: <4'*( ' Sk I)wmentioning

confidence: 99%

“…(1. 19) The factorization of the exchange contribution to the two-body scattering amplitude is not as well justified as is the case for the direct term; in the limit of Born approximation, the exchange scattering amplitude is very definitely a function of k{. If nonetheless we make the previous factorization, assumptions (a) and (b), and make use of the conservation of mo-…”

Section: E-k-w±iementioning

confidence: 99%

“…18 Cross sections for inelastic scattering of protons to the 4.43-Mev level of C 12 were evaluated when the proton-nucleon interaction was treated in Born approximation but the projectile and target nucleons were described by complex opticaland shell-model wave functions, respectively; radial integrals were performed throughout the nuclear volume. Reasonable fits of the proton angular distribution 19 and gamma-ray angular correlation 6 could be obtained with realistic nuclear parameters for proton energies between 14 and 31 Mev, a range where the ABM formula fails to match experiment. For higher incident energies and large momentum transfer, however, the calculated cross sections became very small and lost their oscillatory behavior.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Inelastic Scattering from Light Nuclei—the Alpha-Particle Model forBe9

Blair

Henley

1958

The inelastic scattering of nucleons, deuterons, and alpha particles from light nuclei is discussed in terms of direct interactions. The validity of this description, and of the approximations made here and by other authors in calculating cross sections, are analyzed in detail. Physical arguments are given for the use of a collective representation of light nuclei, in order to explain the preferential excitation of certain well-defined nuclear states by short-wavelength projectiles. As an example, the alpha-particle model is used to characterize Be 9 and the inelastic cross sections for excitation of rotational, vibrational, and single-particle states are calculated with an impulse approximation. The model, and results computed from it, are examined and compared to experimental findings.