Diffusion des protons polarisés sur 24Mg, 27Al et 32S et anomalies dans la région des résonances géantes de l'25Al, du 28Si et du 33C1

Roy, R.; Lamontagne, Claude; Slobodrian, R.J.; Arvieux, J.; Bírchall, J.; Conzett, H.E.

doi:10.1016/0375-9474(83)90504-3

Cited by 15 publications

(3 citation statements)

References 17 publications

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“…There The calculated proton elastic scattering angular distributions using SkC and the proton global POP KD are compared with the experimental data for different targets. Figure 17 shows the comparisons of the SkC results with the experimental data [77][78][79][80][81][82][83] for 27 Al at incident proton energies from 0.783 to 95.7 MeV. Reasonable agreements between the SkC results and the experimental data are obtained, except for incident proton energy 23.0 MeV above 130 • , where the SkC results are smaller than the experimental data and the curve shapes of our results are similar to the experimental data.…”

Section: The Calculations and Analysis Of The Projectile Nucleon Reac...mentioning

confidence: 57%

New Skyrme interaction parameters for a unified description of the nuclear properties

Guo

Han

et al. 2013

J. Phys. G: Nucl. Part. Phys.

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The nucleon microscopic optical potential is obtained by calculating the mass operator of the one-particle Green function with an effective Skyrme interaction. The real and imaginary part potentials for finite nuclei are given by applying a local density approximation as usual, while the spin–orbit potential is further amended by using the Skyrme–Hartree–Fock approach and relativistic mean field results. The new variants of Skyrme interaction parameters are found by simultaneously fitting the characteristics of nuclear matter, the binding energy, charge radius and single-particle energy levels of double closed shell nuclei, the neutron induced reaction cross sections and polarization data. These data include the total cross sections, nonelastic sections, elastic scattering angular distributions and analyzing powers for the target mass range 24 ⩽ A ⩽ 209 with incident neutron energies below 100 MeV. Further, the Landau parameters are considered to describe the properties of an excited state. The obtained variants of Skyrme forces are used to predict the neutron–actinide reactions with incident energies below 100 MeV. It is found that the calculations can give a satisfactory description of the experimental data. Analogous calculations by the new Skyrme forces are performed to predict the proton induced reactions, which also yield reasonable results.

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Section: The Calculations and Analysis Of The Projectile Nucleon Reac...mentioning

confidence: 57%

New Skyrme interaction parameters for a unified description of the nuclear properties

Guo

Han

et al. 2013

J. Phys. G: Nucl. Part. Phys.

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“…The validity of our OMP for each isotopic chain ranges from E p = 0 − 250 MeV for 24 Mg, E p = 0 − 200 MeV for 28 Si and E p = 0 − 160 MeV for 56 Fe. The proton and neutron experimental angular distribution cross sectiondata can be found in Refs [59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76] for 24,25,26 Mg, Refs. [59, 62, 67-69, 72, 74, 75, 77-96] for 28,29,30 Si and Refs.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Measurement and analysis of nuclear $γ$-ray production cross sections in proton interactions with Mg, Si and Fe nuclei abundant in astrophysical sites over the incident energy range $E=30-66$ MeV

Yahia-Cherif,

Ouichaoui,

Kiener

et al. 2020

Preprint

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Gamma-ray production cross section excitation functions have been measured for 30, 42, 54 and 66 MeV proton beams accelerated onto targets of astrophysical interest, nat C, C + O (Mylar), nat Mg, nat Si and 56 Fe, at the Sector Separated Cyclotron (SSC) of iThemba LABS (near Cape Town, South Africa). The AFRODITE array equipped with 8 Compton suppressed HPGe clover detectors was used to record γ-ray data. For known, intense γ-ray lines the previously reported experimental data measured up to Ep ≃ 25 MeV at the Washington and Orsay tandem accelerators were extended to higher proton energies. Our experimental data for the last 3 targets are reported here and discussed with respect to previous data and the Murphy et al. compilation [ApJS 183, 142 (2009)], as well as to predictions of the nuclear reaction code TALYS. The overall agreement between theory and experiment obtained in first-approach calculations using default input parameters of TALYS has been appreciably improved by using modified optical model potential (OMP), deformation, and level density parameters. The OMP parameters have been extracted from theoretical fits to available experimental elastic/inelastic nucleon scattering angular distribution data by means of the coupled-channels reaction code OPTMAN. Experimental data for several new γ-ray lines are also reported and discussed. The astrophysical implications of our results are emphasised.

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“…The proton and neutron experimental angular distribution cross section data can be found in Refs. [61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78] for 24,25,26…”

mentioning

confidence: 99%

Measurement and analysis of nuclear γ -ray production cross sections in proton interactions with Mg, Si, and Fe nuclei abundant in astrophysical sites over the incident energy range E=30–66 MeV

Yahia-Chérif¹,

Ouichaoui²,

Kiener³

et al. 2020

Phys. Rev. C

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The modeling of nuclear γ -ray line emission induced by highly accelerated particles in astrophysical sites (e.g., solar flares, the gas and dust in the inner galaxy) and the comparison with observed emissions from these sites needs a comprehensive database of related production cross sections. The most important reactions of protons and α particles are those with abundant target elements like C, O, N, Ne, Mg, Si, and Fe at projectile energies extending from the reaction threshold to a few hundred MeV per nucleon. In this work, we have measured γ -ray production cross section excitation functions for 30, 42, 54, and 66 MeV proton beams accelerated onto nat C, C + O (Mylar), nat Mg, nat Si, and 56 Fe targets of astrophysical interest at the Separated Sector Cyclotron (SSC) of iThemba LABS (near Cape Town, South Africa). The AFRODITE array equipped with eight Compton suppressed high-purity (HPGe) clover detectors was used to record γ -ray line energy spectra. For known, intense lines previously reported experimental data measured up to E p 25 MeV at the Washington and Orsay tandem accelerators were thus extended to higher proton energies. Our experimental data for the last three targets are reported here and discussed with respect to previous data and to the Murphy et al. compilation [Astrophys. J. Suppl. Ser. 183, 142 (2009)], as well as to the predictions of the nuclear reaction code TALYS. The overall agreement between theory and experiment obtained in first-approach calculations using default input parameters of TALYS has been appreciably improved by using modified optical model potential (OMP), level deformation, and level density parameters. The OMP parameters have been extracted from theoretical fits to available experimental elastic and inelastic nucleon scattering angular distribution data by means of the coupled-channels reaction code OPTMAN. Experimental data for several new γ -ray lines are also reported and discussed. The astrophysical implications of our results are emphasised.

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Diffusion des protons polarisés sur 24Mg, 27Al et 32S et anomalies dans la région des résonances géantes de l'25Al, du 28Si et du 33C1

Cited by 15 publications

References 17 publications

New Skyrme interaction parameters for a unified description of the nuclear properties

New Skyrme interaction parameters for a unified description of the nuclear properties

Measurement and analysis of nuclear $γ$-ray production cross sections in proton interactions with Mg, Si and Fe nuclei abundant in astrophysical sites over the incident energy range $E=30-66$ MeV

Measurement and analysis of nuclear γ -ray production cross sections in proton interactions with Mg, Si, and Fe nuclei abundant in astrophysical sites over the incident energy range E=30–66 MeV

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