Photofissility of heavy nuclei at intermediate energies

Deppman, A.; Tavares, O. A. P.; Duarte, S. B.; Arruda‐Neto, J. D. T.; Gonçalves, Marco Antônio; Likhachev, V.P.; Oliveira, Evandro Chaves de

doi:10.1103/physrevc.66.067601

Cited by 40 publications

(45 citation statements)

References 17 publications

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“…This code has been developed for more than ten years [8][9][10][11][12][13][14] and it has been applied in the study of fission induced by photons and protons, and for the study of hyper-nuclear decay [15]. It has also been used in the development of new nuclear reactor technologies [16][17][18].…”

Section: Methodsmentioning

confidence: 99%

Photon and proton induced fission on heavy nuclei at intermediate energies

Andrade-II

Karapetyan

Deppman

et al. 2014

EPJ Web of Conferences

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Abstract. We present an analysis of fission induced by intermediate energy protons or photons on actinides. The 660 MeV proton induced reactions are on 241 Am, 238 U, and 237 Np targets and the Bremmstrahlung-photons with end-point energies at 50 MeV and 3500 MeV are on 232 Th and 238 U targets. The study was performed by means of the Monte Carlo simulation code CRISP. A multimodal fission extension was added to the code within an approach which accounts for the contribution of symmetric and asymmetric fission. This procedure allowed the investigation of fission cross sections, fissility, number of evaporated nucleons and fission-fragment charge distributions. The comparison with experimental data show a good agreement between calculations and experiments.

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Section: Methodsmentioning

confidence: 99%

Photon and proton induced fission on heavy nuclei at intermediate energies

Andrade-II

Karapetyan

Deppman

et al. 2014

EPJ Web of Conferences

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“…Both intranuclear cascade and evaporation/fission calculations with the CRISP model have been extensively investigated yielding good results for reactions induced by photons, electrons and protons and observables such as neutron or proton multiplicity, fission and spallation cross sections, and fragment mass distributions [14,16,17,[22][23][24][25][26][27].…”

Section: Modelmentioning

confidence: 99%

Evidence of subnucleonic degrees of freedom inJ/ψphotoproduction in ultraperipheral collisions at energies available at the CERN Large Hadron Collider

et al. 2015

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We present calculations for the incoherent photoproduction of J/ψ vector mesons in ultraperipheral heavy ion collisions (UPC) in terms of hadronic interactions. This study was carried out using the recently developed Monte Carlo model CRISP extended to include UPCs at LHC energies. A careful study of re-scattering and destruction of the J/ψ particles is presented for PbPb collisions at √ sNN = 2.76 TeV. We have also compared our method to AuAu collisions at √ sNN = 200 GeV measured at RHIC.PACS numbers: 24.10.Lx, 25.20.Lj, 25.90.+k

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“…The routine calculation of the probability-values for the neutron emission (n), proton emission (p), alpha-particle emission (α), and fission (f ) modes has been already detailed in [5][6][7]. For the level-density parameter of the residual nucleus after neutron evaporation, a n , we adopted the expression…”

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confidence: 99%

New approach to nuclear photofission reactions above 0.15 GeV

Tavares¹,

Duarte²,

Deppman

et al. 2004

Braz. J. Phys.

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A simple approach to evaluate nuclear photofissilities at energies above the pion photoproduction threshold has been developed. It is based on the current, two-step model for intermediate-energy photonuclear reactions, i.e. a photon-induced intranuclear cascade followed by a fission-evaporation competition process for the excited, post-cascade residual nucleus. The calculation method (semiempirical by nature) shows that fissility (i.e., total fission probability) is governed by two basic quantities, namely, the first-chance fission probability for the average cascade residual, and a parameter which defines an evaporative sequence of residuals in which the average, equivalent chance-fission probabilities of nuclides belonging to the same generation are located. The nat Pb photofissility data measured recently in the range ∼ 0.2 − 3.8 GeV at the Thomas Jefferson Laboratory could be explained very satisfactorily by the present approach.The simultaneous photofission cross section measurements carried out very recently at the Thomas Jefferson Laboratory on a number of actinide target nuclei and natural lead using tagged photons in the range ∼0.2-3.8 GeV and PPAD-detectors for detection of fission fragments [1,2] made possible to extract important conclusions about the nuclear photoabsorption and fissility of these nuclei. Among others, i) the 237 Np photofissility is very close to unity in the whole energy interval, thus indicating that its photofission cross section is almost completely equal to the total photoabsorption cross section, and ii) the photofissility for all other actinide nuclei (uranium isotopes and thorium) is less than unity, therefore their photofission cross section does not represent the photoabsorption cross section for these nuclei. Very recently, results of a detailed and refined description of photofission reactions in heavy nuclei covering a large photon energy range ( ∼0.07−4.0 GeV) became also available [3]. Since photofissility data for actinide targets have been already analysed to some detail [2-4], we decided in the present work to focus attention on the newest photofissility data of nat Pb reported in [1,2]. Photofissility data will be here analysed in the framework of a phenomenological, semi-empirical way, aiming to obtain average calculated fissility values from an approach which has been developed for the first time in describing intermediate-energy photofission reactions in the entire energy range of ∼0.2−3.8 GeV covered by the measured photofission cross section data. Monte Carlo calculations are, at present, the main tool to describe quantitatively both the cascade and fission-evaporation competition processes, as well as to obtain the total fission probabilities (i.e., fissility values) for a number of photofission reaction cases. However, for cases where the target nucleus is expected to have very low fissility-values (pre-actinide, intermediate-mass, and less massive nuclei), the available codes may reveal themselves very time-consuming in obtaining a calculated fissility-cur...

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Photofissility of heavy nuclei at intermediate energies

Cited by 40 publications

References 17 publications

Photon and proton induced fission on heavy nuclei at intermediate energies

Photon and proton induced fission on heavy nuclei at intermediate energies

Evidence of subnucleonic degrees of freedom inJ/ψphotoproduction in ultraperipheral collisions at energies available at the CERN Large Hadron Collider

New approach to nuclear photofission reactions above 0.15 GeV

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