Updated Partial Cross Sections of Proton‐Nucleus Reactions

Silberberg, R.; Tsao, C. H.; Barghouty, A. F.

doi:10.1086/305862

Cited by 163 publications

(249 citation statements)

References 24 publications

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“…In fig. 2 we present the comparison of our mass distributions with two of these formulae, from Webber et al [12] and Silberberg et al [13]. It can be observed that the Webber formula correctly predicts the highest mass cross-sections while the disagreement increases as the mass decreases.…”

Section: Comparison To Empirical Formulamentioning

confidence: 77%

Measurement of residual nucleus cross sections and recoil energies in p + Fe collisions at 300, 500, 750, 1000 and 1500 MeV

Villagrasa

Boudard

Ducret

et al. 2005

AIP Conference Proceedings

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Abstract. The production of residual nuclei in p + Fe collisions has been measured at GSI on the FRS facility by means of the reverse kinematic techniques at 300, 500, 750, 1000 and 1500 MeV/A. The cross-sections larger than 0.01 mb of all isotopes with Z larger than 8 have been obtained. Velocity distributions were also measured. Comparisons to models describing spallation reactions and some empirical formulae often used in astrophysics are presented. These data are directly used to calculate impurety production and DPAs in a thin window as foreseen in spallation sources or accelerator-driven systems.

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Section: Comparison To Empirical Formulamentioning

confidence: 77%

Measurement of residual nucleus cross sections and recoil energies in p + Fe collisions at 300, 500, 750, 1000 and 1500 MeV

Villagrasa

Boudard

Ducret

et al. 2005

AIP Conference Proceedings

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“…2D histograms of the relative differences between various semi-empirical models currently used to calculate the production cross-sections σ b→a . Our reference model is Webber et al (2003) (Webber 03), and we compare it to the parameterisations from Webber et al (1990) (Webber 93), Webber et al (1998) (Webber 98) and Silberberg et al (1998) (S&T 00). The charges of the parent and child nuclei are given on the vertical and horizontal axes, respectively.…”

Section: Cross-section Modellingmentioning

confidence: 99%

Theoretical uncertainties in extracting cosmic-ray diffusion parameters: the boron-to-carbon ratio

Génolini

Putze

Salati

et al. 2015

A&A

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Context. PAMELA and, more recently, AMS-02, are ushering us into a new era of greatly reduced statistical uncertainties in experimental measurements of cosmic-ray fluxes. In particular, new determinations of traditional diagnostic tools such as the boron-tocarbon ratio (B/C) are expected to significantly reduce errors on cosmic-ray diffusion parameters, with important implications for astroparticle physics, ranging from inferring primary source spectra to indirect dark matter searches. Aims. It is timely to stress, however, that the conclusions obtained crucially depend on the framework in which the data are interpreted as well as on some nuclear input parameters. We aim at assessing the theoretical uncertainties affecting the outcome, with models as simple as possible while still retaining the key dependencies. Methods. We compared different semi-analytical, two-zone model descriptions of cosmic-ray transport in the Galaxy: infinite slab(1D), cylindrical symmetry (2D) with homogeneous sources, cylindrical symmetry (2D) with inhomogeneous source distribution. We tested for the effect of a primary source contamination in the boron flux by parametrically altering its flux. We also tested for nuclear cross-section uncertainties. All hypotheses were compared by χ 2 minimisation techniques to preliminary results from AMS-02. Results. We find that the main theoretical bias on the determination of the diffusion coefficient index δ (up to a factor two) is represented by the assumption that no injection of boron takes place at the source. The next most important uncertainty is represented by cross-section uncertainties, which reach ±20% in δ. As a comparison, nuclear uncertainties are more important than the shift in the best-fit when introducing a convective wind of velocity 30 km s −1 , with respect to a pure diffusive baseline model. Perhaps surprisingly, homogeneous 1D vs. 2D performances are similar in determining diffusion parameters. An inhomogeneous source distribution marginally alters the central value of the diffusion coefficient normalisation (at the 10%, 1σ level). However, the index of the diffusion coefficient δ is basically unaltered, as well as the goodness of fit. Conclusions. Our study suggests that, differently for instance from the leptonic case, realistic modelling of the geometry of the Galaxy and of the source distribution are of minor importance to correctly reproduce B/C data at high energies and thus, to a large extent, for the extraction of diffusion parameters. The ansatz on the lack of primary injection of boron represents the most serious bias and requires multi-messenger studies to be addressed. If this uncertainty could be lifted, nuclear uncertainties would still represent a serious concern; they degrade the systematic error on the inferred parameters to the 20% level, or three times the estimated experimental sensitivity. To reduce this, a new nuclear cross-section measurement campaign might be required.

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“…The model used the partial cross-sections of Silberberg & Tsao (11,12). The escape mean free path, A es c» was taken to be a function of rigidity, R, and particle velocity, (3, and gave results consistent with CRIS observations for the sub-iron/iron ratio.…”

Section: Trans-nickel Elementsmentioning

confidence: 99%

Cosmic ray source abundances and the acceleration of cosmic rays

George¹,

Wiedenbeck²,

Barghouty³

et al. 2000

AIP Conference Proceedings

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Abstract.The galactic cosmic ray elemental source abundances display a fractionation that is possibly based on first ionization potential (FIP) or volatility. A few elements break the general correlation of FIP and volatility and the abundances of these may help to distinguish between models for the origin of the cosmic ray source material. Data from the Cosmic Ray Isotope Spectrometer instrument on NASA's Advanced Composition Explorer spacecraft were used to derive source abundances for several of these elements (Na, Cu, Zn, Ga, Ge). Three (Na, Cu, Ge) show depletions which could be consistent with a volatility-based source fractionation model.

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Updated Partial Cross Sections of Proton‐Nucleus Reactions

Cited by 163 publications

References 24 publications

Measurement of residual nucleus cross sections and recoil energies in p + Fe collisions at 300, 500, 750, 1000 and 1500 MeV

Measurement of residual nucleus cross sections and recoil energies in p + Fe collisions at 300, 500, 750, 1000 and 1500 MeV

Theoretical uncertainties in extracting cosmic-ray diffusion parameters: the boron-to-carbon ratio

Cosmic ray source abundances and the acceleration of cosmic rays

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