The Experts below are selected from a list of 295347 Experts worldwide ranked by ideXlab platform
Ayyad Y. - One of the best experts on this subject based on the ideXlab platform.
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Fission-fragment yields and prompt-neutron multiplicity for Coulomb-induced fission of $^{234,235}\mathrm{U}$ and $^{237,238}\mathrm{Np}$
'American Physical Society (APS)', 2021Co-Authors: Martin J.-f., Chatillon A., Taïeb J., Alvarez-pol H., Audouin L., Boutoux G., Gorbinet T., Pellereau E., Heinz A., Ayyad Y.Abstract:Low-energy fission of U234,235 and Np237,238 radioactive beams, provided by the Fragment Separator (FRS) of the GSI Helmholtzzentrum für Schwerionenforschung facility (GSI), has been studied using the Reactions with Relativistic Radioactive Beams / Studies on Fission with Aladin (R3B/SOFIA) setup. The latter allows us, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This article reports new results on elemental, isotonic, isobaric, and Isotopic yields. Moreover, the high accuracy of our data allowed us to study in detail proton even-odd staggering, from elemental yields; neutron excess, from Isotopic yields; and total prompt-neutron multiplicity, from the difference of masses of the fissioning nucleus and fission fragments. These results are then compared to previous experimental data in order to probe how these fission observables change as function of the excitation energy and atomic and neutron numbers of the compound nucleus
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Fission-fragment yields and prompt-neutron multiplicity for Coulomb-induced fission of $^{234,235}\mathrm{U}$ and $^{237,238}\mathrm{Np}$
'American Physical Society (APS)', 2021Co-Authors: Martin J.-f., Chatillon A., Taïeb J., Alvarez-pol H., Audouin L., Boutoux G., Gorbinet T., Pellereau E., Heinz A., Ayyad Y.Abstract:International audienceLow-energy fission of U234,235 and Np237,238 radioactive beams, provided by the Fragment Separator (FRS) of the GSI Helmholtzzentrum für Schwerionenforschung facility (GSI), has been studied using the Reactions with Relativistic Radioactive Beams / Studies on Fission with Aladin (R3B/SOFIA) setup. The latter allows us, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This article reports new results on elemental, isotonic, isobaric, and Isotopic yields. Moreover, the high accuracy of our data allowed us to study in detail proton even-odd staggering, from elemental yields; neutron excess, from Isotopic yields; and total prompt-neutron multiplicity, from the difference of masses of the fissioning nucleus and fission fragments. These results are then compared to previous experimental data in order to probe how these fission observables change as function of the excitation energy and atomic and neutron numbers of the compound nucleus
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Experimental study of nuclear fission along the thorium Isotopic chain: From asymmetric to symmetric fission
'American Physical Society (APS)', 2019Co-Authors: Chatillon A., Taïeb J., Alvarez-pol H., Audouin L., Ayyad Y., Boutoux G., Bélier G., Benlliure J., Caamaño M., Casarejos E.Abstract:International audienceThe inverse kinematics technique, applied to radioactive beams and combined to the Coulomb excitation method, is a powerful tool to study low-energy fission. A novel experimental setup was developed within the R3B/SOFIA (Reactions with Relativistic Radioactive Beams/Studies On FIssion with Aladin) collaboration to identify in mass and atomic numbers both fission fragments in coincidence. These new data provide elemental, isobaric, and isotonic yields for the fission along the thorium Isotopic chain. Results are also compared to previous measurements using either the same reaction mechanism or thermal-neutron induced fission. This latter comparison permits to probe the influence of the excitation energy in the fission process
Yongsong Huang - One of the best experts on this subject based on the ideXlab platform.
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Inverse gradients in leaf wax δD and δ^13C values along grass blades of Miscanthus sinensis: Implications for leaf wax reproduction and plant physiology
Oecologia, 2013Co-Authors: Yongsong HuangAbstract:Compound specific hydrogen and carbon Isotopic ratios of higher plant leaf waxes have been extensively used in paleoclimate and paleoenvironmental reconstructions. However, studies so far have focused on the comparison of leaf wax Isotopic differences in bulk leaf samples between different plant species. We sampled three different varieties of tall grasses ( Miscanthus sinensis ) in six segments from base to tip and determined hydrogen and carbon Isotopic ratios of leaf waxes, as well as hydrogen and oxygen Isotopic ratios of leaf water samples. We found an increasing, base-to-tip hydrogen Isotopic gradient along the grass blades that can probably be attributed to active leaf wax regeneration over the growth season. Carbon Isotopic ratios, on the other hand, show opposite trends to hydrogen Isotopic ratios along the grass blades, which may reflect different photosynthetic efficiencies at different blade locales.
Areg Danagoulian - One of the best experts on this subject based on the ideXlab platform.
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a physically cryptographic warhead verification system using neutron induced nuclear resonances
Nature Communications, 2019Co-Authors: Ezra M Engel, Areg DanagoulianAbstract:Arms control treaties are necessary to reduce the large stockpiles of the nuclear weapons that constitute one of the biggest dangers to the world. However, an impactful treaty hinges on effective inspection exercises to verify the participants' compliance to the treaty terms. Such procedures would require verification of the authenticity of a warhead undergoing dismantlement. Previously proposed solutions lacked the combination of Isotopic sensitivity and information security. Here we present the experimental feasibility proof of a technique that uses neutron induced nuclear resonances and is sensitive to the combination of Isotopics and geometry. The information is physically encrypted to prevent the leakage of sensitive information. Our approach can significantly increase the trustworthiness of future arms control treaties while expanding their scope to include the verified dismantlement of nuclear warheads themselves.
Chatillon A. - One of the best experts on this subject based on the ideXlab platform.
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Fission-fragment yields and prompt-neutron multiplicity for Coulomb-induced fission of $^{234,235}\mathrm{U}$ and $^{237,238}\mathrm{Np}$
'American Physical Society (APS)', 2021Co-Authors: Martin J.-f., Chatillon A., Taïeb J., Alvarez-pol H., Audouin L., Boutoux G., Gorbinet T., Pellereau E., Heinz A., Ayyad Y.Abstract:Low-energy fission of U234,235 and Np237,238 radioactive beams, provided by the Fragment Separator (FRS) of the GSI Helmholtzzentrum für Schwerionenforschung facility (GSI), has been studied using the Reactions with Relativistic Radioactive Beams / Studies on Fission with Aladin (R3B/SOFIA) setup. The latter allows us, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This article reports new results on elemental, isotonic, isobaric, and Isotopic yields. Moreover, the high accuracy of our data allowed us to study in detail proton even-odd staggering, from elemental yields; neutron excess, from Isotopic yields; and total prompt-neutron multiplicity, from the difference of masses of the fissioning nucleus and fission fragments. These results are then compared to previous experimental data in order to probe how these fission observables change as function of the excitation energy and atomic and neutron numbers of the compound nucleus
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Fission-fragment yields and prompt-neutron multiplicity for Coulomb-induced fission of $^{234,235}\mathrm{U}$ and $^{237,238}\mathrm{Np}$
'American Physical Society (APS)', 2021Co-Authors: Martin J.-f., Chatillon A., Taïeb J., Alvarez-pol H., Audouin L., Boutoux G., Gorbinet T., Pellereau E., Heinz A., Ayyad Y.Abstract:International audienceLow-energy fission of U234,235 and Np237,238 radioactive beams, provided by the Fragment Separator (FRS) of the GSI Helmholtzzentrum für Schwerionenforschung facility (GSI), has been studied using the Reactions with Relativistic Radioactive Beams / Studies on Fission with Aladin (R3B/SOFIA) setup. The latter allows us, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This article reports new results on elemental, isotonic, isobaric, and Isotopic yields. Moreover, the high accuracy of our data allowed us to study in detail proton even-odd staggering, from elemental yields; neutron excess, from Isotopic yields; and total prompt-neutron multiplicity, from the difference of masses of the fissioning nucleus and fission fragments. These results are then compared to previous experimental data in order to probe how these fission observables change as function of the excitation energy and atomic and neutron numbers of the compound nucleus
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Experimental study of nuclear fission along the thorium Isotopic chain: From asymmetric to symmetric fission
'American Physical Society (APS)', 2019Co-Authors: Chatillon A., Taïeb J., Alvarez-pol H., Audouin L., Ayyad Y., Boutoux G., Bélier G., Benlliure J., Caamaño M., Casarejos E.Abstract:International audienceThe inverse kinematics technique, applied to radioactive beams and combined to the Coulomb excitation method, is a powerful tool to study low-energy fission. A novel experimental setup was developed within the R3B/SOFIA (Reactions with Relativistic Radioactive Beams/Studies On FIssion with Aladin) collaboration to identify in mass and atomic numbers both fission fragments in coincidence. These new data provide elemental, isobaric, and isotonic yields for the fission along the thorium Isotopic chain. Results are also compared to previous measurements using either the same reaction mechanism or thermal-neutron induced fission. This latter comparison permits to probe the influence of the excitation energy in the fission process
P J Hore - One of the best experts on this subject based on the ideXlab platform.
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source of magnetic field effects on the electrocatalytic reduction of co2
Journal of Chemical Physics, 2020Co-Authors: Thomas C Player, P J HoreAbstract:We present an analysis of reported magnetic field effects (MFEs) on the yield of formic acid produced by electrocatalytic reduction of carbon dioxide at a nanoparticle tin electrode [H. P. Pan et al., J. Phys. Chem. Lett. 11, 48–53 (2020)]. Radical pair spin dynamics simulations are used to show that (1) the Δg mechanism favored by Pan et al. is not sufficient to explain the observed magneto-current, (2) field-dependent spin relaxation, resulting from the anisotropy of the g-tensor of CO2•−, combined with the coherent singlet–triplet interconversion arising from isotropic hyperfine and Zeeman interactions, can quantitatively account for the observed MFE, and (3) modification of hyperfine interactions by Isotopic substitution (1H → 2H and/or 12C → 13C) could be used to test both the proposed reaction mechanism and the interpretation presented here.
