Total nuclear photoabsorption cross section in the range 0.2-1.0 GeV for nuclei throughout the periodic table

Terranova, Maria Letizia; Tavares, O. A. P.

doi:10.1088/0031-8949/49/3/004

Cited by 7 publications

(14 citation statements)

References 62 publications

(9 reference statements)

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“…We can understand these results if we recall that fission probabilities are much higher for nuclei with masses above A ≈ 230, and decreases very fast as A decreases below 230(see, for instance, Ref. [19]). Therefore, in the reactions on Np, Am or U there is a considerable probability for fission even after the emission of several nucleons during the intranuclear and evaporation steps, while in the reactions on Pb the fission probabilities decreases very fast as nucleons are emitted.…”

Section: Introductionmentioning

confidence: 81%

Effects of fissioning nuclei distributions on fragment mass distributions for high energy fission

Andrade-II

Menezes

Duarte

et al. 2012

EPJ Web of Conferences

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Abstract.We study the effects of fissioning nuclei mass-and energy-distributions on the formation of fragments for fission induced by high energy probes. A Monte Carlo code called CRISP was used for obtaining mass distributions and spectra of the fissioning nuclei for reactions induced by 660 MeV protons on 241 Am and on 239 Np, by 500 MeV protons on 208 Pb, and by Bremsstrahlung photons with end-point energies at 50 MeV and 3500 MeV on 238 U. The results show that even at high excitation energies, asymmetric fission may still contribute significantly to the fission cross section of actinide nuclei, while it is the dominante mode in the case of lead. However, more precise data for high energy fission on actinide are necessary in order to allow definite conclusions.

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Section: Introductionmentioning

confidence: 81%

Effects of fissioning nuclei distributions on fragment mass distributions for high energy fission

Andrade-II

Menezes

Duarte

et al. 2012

EPJ Web of Conferences

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“…When the isotope production in the reaction under investigation is direct and independent (I) of the parent nuclei decay, the cross section is determined by Eq. (11). If the yield of a given isotope receives a contribution from the β ± decay of neighboring unstable isobar, the cross section calculation becomes more complicated [48].…”

Section: Methodsmentioning

confidence: 99%

“…In fact, the fission probability for heavy nuclei drops very fast as the mass number decreases [10][11][12], and thus, a long evaporation chain would lead to lower fissility nuclei. Another possibility for the formation of IMF would be a very long evaporation chain leading to light spallation products.…”

Section: Theoretical Aspects Of Imf Formationmentioning

confidence: 99%

Superasymmetric fission of heavy nuclei induced by intermediate-energy protons

Deppman¹,

Andrade-II²,

Guimarães³

et al. 2013

Phys. Rev. C

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In this work we present the results for the investigation of intermediate-mass fragment (IMF) production with the proton-induced reaction at 660 MeV on 238 U and 237 Np target. The data were obtained with the LNR Phasotron U-400M Cyclotron at Joint Institute for Nuclear Research (JINR), Dubna, Russia. A total of 93 isotopes, in the mass range of 30 < A < 200, were unambiguously identified with high precision. The fragment production cross sections were obtained by means of the induced-activation method in an off-line analysis. Mass-yield distributions were derived from the data and compared with the results of the simulation code CRISP for multimodal fission. A discussion of the superasymmetric fragment production mechanism is also given.

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“…Below are the processes and their expressions reproduced from Ref. [63]: Figure 11: Cross sections (in milibarn) versus the mass of the interacting nucleus A, for the relevant processes included in the EM. This is a partial reproduction of Fig.…”

Section: A1 Formulas For the Inclusive Cross Sectionsmentioning

confidence: 99%

“…8 in Ref. [63]. • Pion production (σ prod π ) Reactions producing pions (π 0 , π+, π − ) and one nucleon (γ, π + N ).…”

Section: A1 Formulas For the Inclusive Cross Sectionsmentioning

confidence: 99%

Improved photomeson model for interactions of cosmic ray nuclei

Morejón¹,

Fedynitch²,

Boncioli³

et al. 2019

J. Cosmol. Astropart. Phys.

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Photon-hadronic interactions are important for the sources and the transport of Ultra-High Energy Cosmic Rays (UHECRs). Current state-of-the-art cosmic ray transport simulations handle nuclear disintegration at energies of the Giant Dipole Resonance at a more sophisticated level, as well as the photohadronic interactions of nucleons in the high-energy regime above the pion production threshold. However, the interactions of nuclei above the pion production threshold are commonly modeled by treating the nucleus as a superposition of free nucleons -ignoring the effect of the nuclear medium. We construct an improved, inclusive model for the photomeson regime for nuclei with A ≤ 56 by employing more accurate, data-driven parametrizations of the interaction cross section, the fragmentation of the primary nucleus and the inclusive pion production cross section that directly affects the production of astrophysical neutrinos. We apply our results to two multi-messenger scenarios (Tidal Disruption Events and Gamma-Ray Bursts) in which photonuclear interactions in the photomeson regime are the dominant cooling process for the highest energy cosmic rays. While we find moderate changes to the mass composition of UHECRs, the astrophysical neutrino fluxes exhibit a significant (factor of a few) reduction compared to the naïve superposition of free nucleons for sources of UHECR nuclei with a populated cascade. The numerical code implementing the model has been made publicly available, which facilitates the integration of our results in similar frameworks.

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Total nuclear photoabsorption cross section in the range 0.2-1.0 GeV for nuclei throughout the periodic table

Cited by 7 publications

References 62 publications

Effects of fissioning nuclei distributions on fragment mass distributions for high energy fission

Effects of fissioning nuclei distributions on fragment mass distributions for high energy fission

Superasymmetric fission of heavy nuclei induced by intermediate-energy protons

Improved photomeson model for interactions of cosmic ray nuclei

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