Proton polarization in scattering at 185 MeV from individual states of 24Mg

doi:10.1016/0375-9474(68)90301-1

Nuclear Physics A

Volume 119, Issue 2, 28 October 1968, Pages 290-304

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Abstract

The polarization of 185 MeV protons elastically and inelastically (−Q = 1.37, 4.21, 6.01, 6.44, 7.60 and 8.38 MeV) scattered from magnesium has been measured in the region 7.5°–40° (lab system). The energy levels studied were selected with the aid of a magnetic spectrometer giving a total energy resolution of 0.7 MeV FWHM. The polarimeter was calibrated using published polarization data at 154 and 138 MeV. The angular distributions obtained were found to be very similar in shape and showed a first maximum for a scattering angle of about 20° and oscillations for larger scattering angles.

References (15)

S. Dahlgren et al.
Nucl. Phys.
(1967)
V.E. Lewis et al.
Nucl. Phys.
(1967)
A. Willis et al.
Nucl. Phys.
(1968)
A. Johansson et al.
Nucl. Phys.
(1959)
A. Johansson et al.
Nucl. Phys.
(1960)
L. Wolfenstein
Ann. Rev. Nucl. Sci.
(1956)
C. Rolland
thèse doctorat d'Etat
(1966)
O.N. Jarvis et al.
Nucl. Phys.
(1966)

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Cited by (14)

An in-beam polarimeter for intermediate energy protons using p + d elastic scattering
1993, Nuclear Inst. and Methods in Physics Research, A
The importance of high quality spin-observable data in intermediate energy nuclear physics requires that techniques be developed for obtaining accurate and reliable measurements of incident beam polarizations in a nondestructive manner. For this purpose, we have constructed, installed, and calibrated two transmission-type polarimeters at IUCF, in which p+d elastic scattering is used to determine the two transverse polarization components of a high energy proton beam. In this report, we discuss some of our experimental design considerations, and provide technical details on the actual implementation schemes chosen. Representative spectra are shown, and typical performance capabilities are described. We have also completed a calibration of the effective analyzing power of the polarimeter (A_pol) as a function of the incident (beam) proton energy, and find A_pol ≈ 0.51 over the entire proton energy range studied in this work ( ∼ 150–200 MeV) when θ_d^lab = 42.6°.
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).
Elastic and inelastic proton scattering from 89Y
1978, Nuclear Physics, Section A
Angular distributions have been obtained for the polarization in elastic scattering, and for the differential cross section in elastic and inelastic scattering of 185 MeV protons from ⁸⁹Y. Only the first excited state at 0.908 MeV, usually considered to be a pure single-particle state, was studied. The elastic scattering data were fitted by optical model calculations and the optical potential obtained was used in DWIA and DWBA calculations for inelastic scattering. Good agreement with the angular distribution for the 0.908 MeV state was obtained both in DWIA and DWBA. However, the DWBA treatment gives abnormal values for the deformation parameters, a fact which can probably be traced back to the single-particle character of this state.
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.
Energy levels of A = 21-44 nuclei (V)
1973, Nuclear Physics, Section A
Optical-model analysis of the elastic scattering of 100 MeV protons from 24Mg and 28Si
1972, Nuclear Physics, Section A
Elastic scattering differential cross sections for the interaction of 100 MeV protons with ²⁴Mg and ²⁸Si have been measured using a high-resolution Ge(Li) spectrometer to resolve the inelastic scattering contribution to the elastic peak. The results have been analysed using the conventional optical model, and the experimental differential cross sections and total reaction cross section are excellently reproduced. The results agree with previous analyses of the elastic scattering of 100 MeV protons on 1p shell nuclei in that no set of geometric parameters can provide a quantitative fit to both nuclei. It is observed, however, that the fluctuations of the optical-model parameters for optimum fits are decreased over the fluctuations observed for the 1p shell nuclei. The present results combined with previous optical-model analyses on ²⁴Mg and ²⁸Si at 50 MeV and 40 MeV respectively, are found to be consistent with an energy dependence of dV/dE ≈ −0.3 for the depth of the real central potential in agreement with other, more extensive, investigations of the energy dependence for protons elastically scattered from ¹⁶O and ⁴⁰Ca.

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Nuclear Physics A

Abstract

References (15)

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Ann. Rev. Nucl. Sci.

thèse doctorat d'Etat

Nucl. Phys.

Cited by (14)

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Polarization in the inelastic scattering of 185 MeV protons

Energy levels of A = 21-44 nuclei (V)

Optical-model analysis of the elastic scattering of 100 MeV protons from <sup>24</sup>Mg and <sup>28</sup>Si