Polarization and cross section measurements for p-4He elastic scattering at 45, 52, 60 and 65 MeV

Hatanaka, K.; Shimizu, H.; Tamura, N.; Egawa, K.; Nisimura, K.; Saito, T.; Sato, Hikaru; Wakuta, Y.

doi:10.1016/0375-9474(79)90023-x

Cited by 31 publications

(13 citation statements)

References 4 publications

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“…The results are consistent with those [17] of the nonlocal microscopic potentials derived from the Melbourne g-matrix interaction, although target wave functions used in two calculations differ. The g-matrix folding model shown by the solid lines yields better agreement with the experimental data [35][36][37][38][39][40][41][42] than the t-matrix folding model denoted by the dashed lines. The medium effect shown by the difference between the solid and dashed lines are more significant for A y .…”

Section: Resultsmentioning

confidence: 55%

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Mass-number and isotope dependence of local microscopic optical potentials for polarized proton scattering

2013

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We derive local microscopic optical potentials U systematically for polarized proton scattering at 65 MeV using the local-potential version of the Melbourne g-matrix folding model. As target nuclei, we take 6 He and neutron-rich Ne isotopes in addition to stable nuclei of mass number A = 4-208 in order to clarify mass-number and isotope dependence of U . The local potentials reproduce the experimental data systematically and have geometries similar to the phenomenological optical potentials for stable targets. The target density is broadened by the weak-binding nature and/or deformation of unstable nuclei. For the real spin-orbit part of U the density broadening weakens the strength and enlarges the radius, whereas for the central part it enlarges both of the strength and the radius. The density-broadening effect is conspicuous for halo nuclei such as 6 He and 31 Ne. Similar discussions are made briefly for proton scattering at 200 MeV. We briefly investigate how the isovector and the non spherical components of U affect proton scattering.

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Section: Resultsmentioning

confidence: 55%

“…The parameter α is fitted to the experimental data [35,36], and the resulting value is α = 0.13. In Fig.…”

Section: Fig 2: (Color Online)mentioning

confidence: 99%

Mass-number and isotope dependence of local microscopic optical potentials for polarized proton scattering

2013

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“…Cross-section data are shown in Figure 4 from various sources listed in the figure caption. They are generally peaked in the direction where protons are forward scattered, but the most efficient direction Cross sections versus scattering angle in the center of mass for p-4 He elastic scattering [Meyer et al, 1972, Votta et al, 1974Comparat et al, 1975;Fong et al, 1978;McCamis et al, 1978;Imai et al, 1979;Moss for trapping the recoil 4 He is where the protons are scattered backward (cos 0 = -1) and the 4 He follow the original proton trajectories. However, small and intermediate angle scattering can also lead to significant particle trapping if the pitch angle is approximately conserved, especially at the high proton energies where the cross sections are strongly forward··peaked.…”

Section: Calculationsmentioning

confidence: 99%

Atmospheric production of radiation belt light isotopes

Selesnick¹,

Mewaldt²

1996

J. Geophys. Res.

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Abstract. Nuclear interactions between inner zone protons and atoms in the upper atmosphere produce energetic H and He nuclei that are an additional radiation belt source. We calculate production rates of these isotopes from models of the inner zone proton intensity, the upper atmosphere drift-averaged composition and densities, and cross sections for the various interaction processes. For comparison with observations of radiation belt H and He isotopes, the production rates are combined with a model of the energy loss rate in the residual atmosphere to calculate particle intensities. Although the calculations are in principle straightforward, they depend on a detailed knowledge of the various model inputs, including models for radiation belt protons, and may also depend on the phase of the solar cycle. On the other hand, the results of the calculations, when compared with the observational data, can provide useful tests of the model inputs. Initial results show that the atmosphere is a significant source for inner zone 4 He, 3 He, and 2 H.

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“…In fact, the cross-section and polarization analysis of Hoop and Barschall (1966), which gives n-a phase shifts from 6 to 30 MeV was till recently the oft-quoted work. The field received further important inputs from the analyses, among others, of Broste et al (1972), who made polarization measurements from 11.0 to 30 MeV, of Lisowski et al (1976), who measured analyzing power from 20 to 30 MeV, and more recently of York et al (1983), whose analyzing power measurement at 50.4 MeV confronted with that of Imai et al (1979) at about the same energy, providing the first opportunity of comparing p-4 He and n-4 He analyzing power above 30 MeV. …”

Section: -20 Mevmentioning

confidence: 99%

A survey of the alpha-nucleon interaction

Ali

Ahmad²,

Ferdous

1985

Rev. Mod. Phys.

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This paper gives a survey of the alpha-nucleon interaction and then describes experimental work on angular distributions of differential scattering cross sections and polarizations in proton-alpha and neutron-alpha scattering. The phenomenological approach, which includes the study of both local and nonlocal potentials reproducing the experimental alpha-nucleon scattering data, is discussed. Basic studies of the alphanucleon interaction attempting to build an interaction between an alpha particle and a nucleon from first principles are then described. The authors then present a critical discussion of the results with some concluding remarks suggesting the direction for further investigation.

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Polarization and cross section measurements for p-4He elastic scattering at 45, 52, 60 and 65 MeV

Cited by 31 publications

References 4 publications

Mass-number and isotope dependence of local microscopic optical potentials for polarized proton scattering

Mass-number and isotope dependence of local microscopic optical potentials for polarized proton scattering

Atmospheric production of radiation belt light isotopes

A survey of the alpha-nucleon interaction

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