Polarization of high energy protons in elastic and inelastic scattering

doi:10.1016/0029-5582(87)90075-7

Nuclear Physics

Volume 4, August–November 1957, Pages 648-661

https://doi.org/10.1016/0029-5582(87)90075-7 Get rights and content

Abstract

The polarizations of 173–7 MeV protons inelastically and elastically scattered by carbon, oxygen, and calcium have been measured with an energy resolution of 2–2.5 MeV full-width at half-weight equivalent. The polarizations of scattered protons corresponding to the low-lying levels of all three elements are large and show strikingly similar angular patterns. The higher levels are much less polarized. The elastic results differ from measurements of elastic asymmetries in having deeper minima, and have been extended to larger angles.

References (14)

H. Tyrén et al.
Nuclear Physics
(1957)
Th.A.J. Maris et al.
Nuclear Physics
(1957)
R. Alphonce et al.
Nuclear Physics
(1957)
H. Tyrén et al.
Nuclear Physics
(1957)
Th.A.J. Maris
Nuclear Physics
(1957)
L. Wolfenstein
Ann. Rev. of Nuc. Sci.
(1956)
K. Strauch et al.
Phys. Rev.
(1956)

There are more references available in the full text version of this article.

Cited by (14)

The scattering of fast nucleons from nuclei
2000, Annals of Physics
The formal theory of the scattering of high-energy nucleons by nuclei is developed in terms of the nucleon–nucleon scattering amplitude. The most important approximations necessary to make numerical calculation feasible are then examined. The optical model potential is derived on this basis and compared with the optical model parameters found from experiment. The elastic scattering and polarization of nucleons from light nuclei is predicted and compared with experiment. The effect of nuclear correlations is discussed. The polarization of inelastically scattered nucleons is discussed and predictions compared with experiments. To within the validity of the approximations the experimental data on the scattering of nucleons from nuclei at energies above ∼100 Mev appears to be consistent with the theory.
Experimental and theoretical studies of positive pion production on 10B and 40Ca by 163-186 MeV protons
1979, Nuclear Physics, Section A
The reactions $^{10} B(p,π^{+})^{11} B$ and $^{40} Ca(p,π^{+})^{41} Ca$ have been studied for proton energies between 163 and 186 MeV. Angular distributions for the ground states and the excited state at 2.13 MeV in ¹¹B are presented. Cross sections calculated in the one-nucleon model, under different assumptions about the interaction Hamiltonian as well as the pion and proton optical potentials, are compared with the experimental distribution from the $1 f_{72}$ state in ⁴¹Ca.
Elastic and inelastic scattering of 185 MeV protons from 12C
1979, Nuclear Physics, Section A
The polarization of 185 MeV protons in elastic scattering and in the excitation of the 2⁺ state at 4.44 MeV and the 0⁺ state at 7.65 MeV in ¹²C has been measured in the angular region 2°–60°. Optical model calculations are performed for the elastic scattering. Angular distributions for the inelastic scattering from the 2⁺ state at 4.44 MeV and the 3⁻ state at 9.64 MeV are calculated in the distorted-wave impulse approximation (DWIA) as well as in the distorted-wave Born approximation (DWBA).
Proton scattering at 1 GeV
1978, Annals of Physics
The physics of 1-GeV proton scattering on nuclei is discussed in the light of recent calculations, and compared to the Gatchina, Los Alamos, and Saclay data. The impulse approximation (including spin-orbit effects and correlations) is reviewed, and comparison is made with other theories such as the Glauber model and the low-energy optical model. This discussion is addressed to specialists as well as nonspecialists in the field. The neutron distribution is extracted from the data and a detailed comparison is made with other determinations of this distribution and with the Hartree-Fock predictions. The neutron radii are seen to be generally larger than the proton radii. Within a given shell, they increase at a much slower rate ( $∼A^{18}$ ) than the $A^{13}$ rule. Except possibly for ²⁰⁸Pb, they are consistent with the Hartree-Fock predictions, but not with the values obtained from Coulomb energies. The study of inelastic scattering to collective states allows the extraction of neutron transition densities, and in particular the analog B(N, L) of the electromagnetic transition rates B(E, L) one usually considers for the protons. Neutron excitations are seen to be stronger by 20 to 40 % than proton excitation, exceeding the $N Z$ prediction of the collective model. Spin effects lead only to small changes in the cross section, but to a measurable analyzing power. The unnatural parity excitations of the lowest 2⁻ (T = 0) state of ¹⁶O and the 1⁺ (T = 1) state of ¹²C show that the spin-spin and tensor terms of the nucleon-nucleon amplitude are sizable. Their relative magnitudes are seen to be crucial for explaining the observed cross sections.
Neutron densities from 1 GeV proton scattering
1977, Physics Letters B
Polarization in the inelastic scattering of 185 MeV protons
1973, Nuclear Physics, Section A
The polarizations produced in the inelastic scattering of 185 MeV protons exciting the lowest octupole states in ¹²C and ²⁰⁸Pb are measured. The data together with earlier similar measurements for ⁴⁰Ca and ⁹⁰Zr are compared with existing theoretical models. The inclusion of a deformed spin-dependent interaction of the full Thomas form in the DWBA amplitude is found to considerably improve the theoretical fits to the data. For ¹²C, however, the DWBA fit is found to be inferior to that obtained using DWIA. The strong absorption model is found to give qualitatively good fits to the data for the heavier nuclei but again fails in the ¹²C case.

View all citing articles on Scopus

^†: CERN (European Organisation for Nuclear Research, theoretical study division). On leave of absence from AERE, Harwell, England.

View full text

Article preview

Nuclear Physics

Abstract

References (14)

Nuclear Physics

Nuclear Physics

Nuclear Physics

Nuclear Physics

Nuclear Physics

Ann. Rev. of Nuc. Sci.

Phys. Rev.

Cited by (14)

The scattering of fast nucleons from nuclei

Experimental and theoretical studies of positive pion production on <sup>10</sup>B and <sup>40</sup>Ca by 163-186 MeV protons

Elastic and inelastic scattering of 185 MeV protons from <sup>12</sup>C

Proton scattering at 1 GeV

Neutron densities from 1 GeV proton scattering

Polarization in the inelastic scattering of 185 MeV protons