Differential Cross Sections For Proton Research Articles

Differential cross section and polarization in p-α scattering from 22 to 25 MeV

The proton differential cross section and polarization in p-α scattering have been measured at 12 lab scattering angles from 20° to 155° for proton energies between 22 and 25 MeV. The resonance corresponding to a 3 2 + state of 5Li is clearly observed. An energy-dependent phase-shift analysis of most of the available p-α scattering data between 20 and 27.8 MeV was made. The energy dependence of the phase shifts was expressed in term of the resonance parameters with the Breit-Wigner single-level formula for the resonant part, and it was assumed to be linear for the non-resonant part. The resonance is well reproduced for both cross section and polarization.

Polarization and Differential Cross Sections of Protons from theNi58(d, p)Ni59Reaction

Polarization and Differential Cross Sections of Protons from the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>58</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mo>(</mml:mo><mml:mi>d</mml:mi><mml:mo>,</mml:mo><mml:mi> </mml:mi><mml:mi>p</mml:mi><mml:mo>)</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>59</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Reaction

The effects of spin-orbit distortion in deuteron stripping reactions

Proton differential cross-section and polarization are calculated for the rreactions C 12(d, p)C 13 (1st excited state) and Si 28(d, p)Si 29 at deuteron energies of 6 MeV and 15 MeV, respectively. The D.W.B.A. is employed and spin-dependent proton distortion is taken into account. Spin-orbit distortion is found to leave a small effect on the cross-sections, but the polarization is found to be large. In the case of the Si 28 reactions good agreement with the experimental polarization is obtained. An approximate treatment of both deuteron and proton spin-dependent distortion is developed and partially justified. Relatively simple expression for the polarization effects are obtained.

Proton Spectra from the Nitrogen Bombardment of Fluorine

Energy spectra and absolute differential cross sections of protons from bombardment of ${\mathrm{F}}^{19}$ with 21.4- and 27.4-Mev ${\mathrm{N}}^{14}$ were measured. The energy spectra were analyzed in terms of the statistical model with a level density $\mathrm{exp}(\frac{{E}^{*}}{T})$, where ${E}^{*}$ is the excitation energy in the residual nucleus of the assumed reaction ${\mathrm{F}}^{19}({\mathrm{N}}^{14}, p){P}^{32}$. The nuclear temperature $T$ increased from about 1.9 Mev at 0\ifmmode^\circ\else\textdegree\fi{} to about 2.5 Mev at 145\ifmmode^\circ\else\textdegree\fi{} c.m., but did not vary with bombarding energy. The angular distribution show minima near 90\ifmmode^\circ\else\textdegree\fi{} c.m., with anisotropy increasing as the bombarding energy and proton energy increase. At the lower bombarding energy there is approximate agreement with the Ericson-Strutinski theory of angular-momentum effects in compound-nucleus processes, over the entire observed ranges of angle and proton energy. The fit is consistent with $\ensuremath{\sigma}=3$ in the nuclear level spin distribution $(2j+1)\mathrm{exp}[\ensuremath{-}\frac{j(j+1)}{(2{\ensuremath{\sigma}}^{2})}]$. At the higher bombarding energy a considerable excess of protons are emitted into the backward hemisphere, especially at high proton energies, suggesting a direct-interaction mechanism in which the observed proton comes from the ${\mathrm{F}}^{19}$.

Studies of inelastic scattering of 185 MeV protons on carbon

Studies of the inelastic scattering of 185 MeV protons on carbon have been performed using a magnetic analyser. Differential cross sections of protons, exciting clearly resolved levels in C 12, are given.