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Artículos de revistas sobre el tema "Hauser-Feshbach"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 18 de febrero de 2022

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1

Ryckbosch, D. y E. Van Camp. "A Hauser-Feshbach compatible unified exciton model". Nuclear Physics A 469, n.º 1 (julio de 1987): 106–24. http://dx.doi.org/10.1016/0375-9474(87)90088-1.

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2

Okumura, Shin, Toshihiko Kawano y Satoshi Chiba. "The fission yield calculations with Langevin model, Hauser-Feshbach statistical decay, and beta decay". EPJ Web of Conferences 239 (2020): 03005. http://dx.doi.org/10.1051/epjconf/202023903005.

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We performed the calculations of de-excitation of the primary fission fragments by the Hauser-Feshbach statistical decay followed by the β decay of de-excited fission products. We used the primary fission fragment mass distributions YP(A), total kinetic energy TKE(A), and its width σTKE(A) as input, which were calculated with the Langevin model using macroscopic-microscopic models of the potential energy surface. The prompt neutron multiplicity v̅ and the independent fission product yield (FPY) YI(Z, A, M) and cumulative FPY YC(Z, A, M) are calculated by the Hauser-Feshbach statistical decay and β decay calculations, respectively. The calculated v̅ was overestimated approximately 17% compared to the evaluated data. The decay heats from β and γ were in accordance with the experimental results. The β delayed neutrons yieild was also overestimated.
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3

Rochman, D., S. Goriely, A. J. Koning y H. Ferroukhi. "Radiative neutron capture: Hauser Feshbach vs. statistical resonances". Physics Letters B 764 (enero de 2017): 109–13. http://dx.doi.org/10.1016/j.physletb.2016.11.018.

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4

Akkermans, J. M., Shi Xiangjun y H. Gruppelaar. "Economizing Hauser-Feshbach model calculations in the continuum". Computer Physics Communications 43, n.º 3 (febrero de 1987): 347–54. http://dx.doi.org/10.1016/0010-4655(87)90052-x.

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5

Kawano, T., P. Talou, M. B. Chadwick y T. Watanabe. "Monte Carlo simulation for statistical Hauser-Feshbach theory". EPJ Web of Conferences 2 (2010): 09001. http://dx.doi.org/10.1051/epjconf/20100209001.

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6

Demetriou, P. "The Energy Dependence of the Proton-Alpha Reaction to Continuum States". HNPS Proceedings 6 (19 de febrero de 2020): 253. http://dx.doi.org/10.12681/hnps.2932.

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The energy dependence of the (p,α) reactions to the continuum states is studied using the Feshbach-Kerman-Koonin multistep theory for the pre-equilibrium reactions assuming the knockout model and using the Hauser-Feshbach theory for the compound nucleus reactions. The energy dependence of the parameter Wo is related to that of the strength of the effective proton-alpha interaction and hence to that of the alpha-particle optical potential. The formalism is extended to include reactions in which the proton is unbound, and this improves the fit to the experimental data.
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7

Spyrou, A., A. Lagoyannis, Ch Zarkadas, S. Harissopulos, H. W. Becker, C. Rolfs y P. Demetriou. "Searching for a Global alpha-nucleus Potential for Astrophysical Applications". HNPS Proceedings 13 (20 de febrero de 2020): 167. http://dx.doi.org/10.12681/hnps.2967.

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This contribution reports on a systematic investigation of in-beam cross-section measurements of (α,γ) reactions, carried out using a 4π calorimeter. The results are compared to the predictions of the Hauser-Feshbach (HF) theory. This com­ parison puts some constraints on the relevant nuclear properties entering the HF calculations.
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8

Mazur, V. M., Z. M. Bigan, P. S. Derechkey y D. M. Symochko. "Excitation of 11/2− isomeric state in 137Ce in (γ,n) reaction within 10–22MeV energy range". International Journal of Modern Physics E 25, n.º 09 (septiembre de 2016): 1650070. http://dx.doi.org/10.1142/s0218301316500701.

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Isomeric yields ratios and energy differential cross-section of metastable state excitation in the [Formula: see text] reaction has been studied in the 10–22[Formula: see text]MeV end-point energy range of bremsstrahlung beams. Experimental data are compared with Hauser–Feshbach calculations performed with TALYS-1.6 statistical model code.
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9

Spyrou, A., A. Lagoyannis, Ch Zarkadas, G. Perdikakis, S. Galanopoulos, P. Demetriou, S. Harissopulos et al. "Proton capture reactions on 116Sn and 118Sn relevant to the p process". HNPS Proceedings 14 (5 de diciembre de 2019): 77. http://dx.doi.org/10.12681/hnps.2252.

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The proton capture reaction cross sections on 116Sn and 118Sn have been determined at astrophysically relevant energies by means of activation, 7-ray angular distribution and angle-integrated 7-flux measurements. The results of the present work together with those obtained in previous measurements are compared to the predictions of the Hauser-Feshbach theory.
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10

Bertolli, M. G., T. Kawano y H. Little. "Uncertainties in Hauser-Feshbach Neutron Capture Calculations for Astrophysics". Nuclear Data Sheets 120 (junio de 2014): 194–96. http://dx.doi.org/10.1016/j.nds.2014.07.044.

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11

BONNET, E., J. P. WIELECZKO, J. GOMEZ DEL CAMPO, M. LA COMMARA, S. BARLINI, C. BECK, B. BORDERIE et al. "INFLUENCE OF NEUTRON ENRICHMENT ON DISINTEGRATION MODES OF COMPOUND NUCLEI". International Journal of Modern Physics E 17, n.º 10 (noviembre de 2008): 2359–62. http://dx.doi.org/10.1142/s0218301308011616.

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Cross sections, kinetic energy and angular distributions of fragments with charge 6 ≤ Z ≤ 28 emitted in 78,82 Kr +40 C at 5.5 MeV/A reactions were measured at the GANIL facility using the INDRA apparatus. This experiment aims to investigate the influence of the neutron enrichment on the decay mechanism of excited nuclei. Data are discussed in comparison with predictions of transition state and Hauser-Feshbach models.
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12

Kawano, T., P. Talou, M. B. Chadwick, S. Holloway, P. Moller y T. Watanabe. "Applications of the Hauser-Feshbach Theory to Advanced Nuclear Sciences". Journal of the Korean Physical Society 59, n.º 2(3) (12 de agosto de 2011): 785–90. http://dx.doi.org/10.3938/jkps.59.785.

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13

Diakaki, M. y Et al For the nTOF Collaboration. "Measurement of the 237Np(n,f) cross section with the FIC detector at the CERN n_TOF facility". HNPS Proceedings 22 (8 de marzo de 2019): 20. http://dx.doi.org/10.12681/hnps.1925.

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The cross section of the 237Np(n,f) reaction has been experimentally determined at the n_TOF facility at CERN, in the neutron energy range 100 keV – 10 MeV, relative to the standard 235U(n,f) and 238U(n,f) reaction cross sections with use of a Fast Ionisation Chamber. The reproduction of the high accuracy data obtained from this experiment was attempted within the Hauser-Feshbach formalism and phenomenological models with use of the code EMPIRE 3.2.
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14

Cabezas, R. y J. Lubian. "Fast-neutron-scattering cross sections in soft nuclei: 56Fe". Canadian Journal of Physics 72, n.º 3-4 (1 de marzo de 1994): 162–68. http://dx.doi.org/10.1139/p94-026.

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The neutron elastic, inelastic, and total cross sections in 56Fe are calculated in the energy range 1–5 MeV using the coupled-channel method and statistical Hauser–Feshbach theory. Reduced matrix elements for coupled-channel calculations were computed in the frame of the Davydov–Chaban model (DCM) including nonaxial hexadecapole modes. The DCM calculations are compared with those using the harmonic vibrational model and we prove that the first model is appropriate for this nucleus. Good agreement with experimental data is reached.
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15

Capote, Roberto, Stéphane Hilaire, Osamu Iwamoto, Toshihiko Kawano y Mihaela Sin. "Inter-comparison of Hauser-Feshbach model codes toward better actinide evaluations". EPJ Web of Conferences 146 (2017): 12034. http://dx.doi.org/10.1051/epjconf/201714612034.

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16

Serris, M. y Et Al. "Study of the (n,2n) reaction cross section on 174,176Hf isotopes". HNPS Proceedings 15 (1 de enero de 2020): 188. http://dx.doi.org/10.12681/hnps.2637.

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Cross section measurements of the 174Hf(n,2n)173Hf and 176Hf(n,2n)175Hf reactions have been performed at the VdG Tandem accelerator of NCSR “Demokritos” in Athens, in the neutron energy region from 8.8 to 11.5 MeV, using the activation technique. Statistical model calculations based on the Hauser - Feshbach theory have also been implemented by using the code EMPIRE-II with different sets of input parameters. The predictions were compared to the data of the present work as well as data from literature.
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17

SINGH, B. P., M. G. V. SANKARACHARYULU, M. A. ANSARI, R. PRASAD y H. D. BHARDWAJ. "MEASUREMENT AND ANALYSIS OF EXCITATION FUNCTIONS FOR ALPHA-INDUCED REACTIONS IN BISMUTH". International Journal of Modern Physics E 01, n.º 04 (diciembre de 1992): 823–31. http://dx.doi.org/10.1142/s0218301392000357.

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Excitation functions for 209 Bi (α, 3n), 209 Bi (α, 4n) and 209 Bi (α, 5n) reactions have been measured in the energy range threshold to ≈50 MeV using stacked foil technique. Excitation functions have also been theoretically calculated and as expected, inclusion of pre-equilibrium contribution based on exciton model calculations along with compound nucleus calculations using Hauser–Feshbach formalism reproduces well the measured excitation functions. Interesting trend in the ratio of pre-equilibrium to equilibrium component with projectile energy has been observed.
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18

Oberstedt, Andreas, Angélique Gatera, Alf Göök y Stephan Oberstedt. "Systematic measurements of prompt fission γ rays – and what they tell us about fission fragment de-excitation". EPJ Web of Conferences 211 (2019): 04001. http://dx.doi.org/10.1051/epjconf/201921104001.

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In a recent measurement of prompt γ rays from the spontaneous fission of 252Cf an experimental setup was chosen that allowed the study of angular correlations between γ rays and the nuclei from which they were emitted. The observed angular distribution of prompt fission γ rays was then analyzed to estimate the relative contributions from radiation of different multipolarity. Preliminary results are presented and compared to previous angular correlationmeasurements from different fission processes and recent results from calculations with the Monte Carlo Hauser-Feshbach code FIFRELIN.
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19

Foteinou, V., M. Axiotis, A. Lagoyannis, P. Demetriou, H. W. Becker, D. Rogalla y S. Harissopulos. "Proton capture reactions in medium-heavy nuclei relevant to p-process nucleosynthesis". HNPS Proceedings 22 (8 de marzo de 2019): 98. http://dx.doi.org/10.12681/hnps.1938.

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Cross-section measurements of proton-capture reactions on Molybdenum isotopes have been performed at beam energies from 2.0 to 6.2 MeV. The cross-section data obtained in this work are compared with those predicted by theory. The latter were calculated using the latest version of the TALYS Hauser-Feshbach (HF) theory code [1] (version 1.6). In these calculations, various phenomenological and (semi)microscopic models were used for the nucleon-nucleus and the α-particle-nucleus optical model potential, the nuclear level densities and the γ-ray strength function.
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20

Asimakopoulou, E. M., E. Malami, T. J. Mertzimekis y V. Foteinou. "Experimental Study of the Astrophysically Interesting 112Cd(p,γ)113In Reaction". HNPS Proceedings 21 (8 de marzo de 2019): 188. http://dx.doi.org/10.12681/hnps.2032.

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An experimental study of the astrophysically interesting 112Cd(p,γ)113In reaction, conducted at INPP, NCSR “Demokritos”, is presented. The purpose of the experiment was to study the total cross section and the angular distribution of the de-excited nuclei. The experiment aimed at both gaining knowledge of proton capture at low energies and serving as a validity test for the Hauser–Feshbach theory, a statistical model of compound reactions of high importance. Both in–beam and activation techniques were used during the experiment and the results are compared to TALYS calculations.
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21

Perdikakis, G., C. T. Papadopoulos, M. Kokkoris y R. Vlastou. "Theoretical calculations for the reaction 241Am(n, 2n) in the framework of the Hauser-Feshbach model". HNPS Proceedings 14 (5 de diciembre de 2019): 83. http://dx.doi.org/10.12681/hnps.2253.

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The cross section of the reaction 2ilAm(n, 2n), has been measured by the activation method in the range from 9.6 to 11.4 MeV, at the Tandem accelerator facility of NCSR Demokritos. Statistical model calculations in the framework of the Hauser- Feshbach theory have been performed, and the first results are presented. Experimental data on the neutron induced fission cross section of 241Am, have been used as a constraint for the calculations. The results of the investigation are presented in comparison with experimental data and previous theoretical evaluations.
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22

Oberstedt, Andreas, Robert Billnert, Angélique Gatera, Alf Göök y Stephan Oberstedt. "Prompt gamma rays from 252Cf(sf) and their angular distributions". EPJ Web of Conferences 169 (2018): 00014. http://dx.doi.org/10.1051/epjconf/201816900014.

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In a recent measurement of prompt γ rays from the spontaneous fission of 252Cf an experimental setup was chosen that allowed the study of angular correlations between γ rays and the nuclei from which they were emitted. The observed angular distribution of prompt fission γ rays was then analyzed to estimate the relative contributions from radiation of different multipolarity. First preliminary results are presented and compared to previous angular correlation measurements from different fission processes and recent results from calculations with the Monte Carlo Hauser-Feshbach code FIFRELIN.
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23

Talou, Patrick, Bjorn Becker, Toshihiko Kawano y Yaron Danon. "Monte Carlo Hauser-Feshbach Modeling of Prompt Fission Neutrons and Gamma Rays". EPJ Web of Conferences 21 (2012): 08003. http://dx.doi.org/10.1051/epjconf/20122108003.

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24

Matsuse, T., C. Beck, R. Nouicer y D. Mahboub. "Extended Hauser-Feshbach method for statistical binary decay of light-mass systems". Physical Review C 55, n.º 3 (1 de marzo de 1997): 1380–93. http://dx.doi.org/10.1103/physrevc.55.1380.

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25

Jaffke, Patrick, Peter Möller, Ionel Stetcu, Patrick Talou y Christelle Schmitt. "Implementing and testing theoretical fission fragment yields in a Hauser-Feshbach statistical decay framework". EPJ Web of Conferences 169 (2018): 00006. http://dx.doi.org/10.1051/epjconf/201816900006.

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We implement fission fragment yields, calculated using Brownian shape-motion on a macroscopic-microscopic potential energy surface in six dimensions, into the Hauser-Feshbach statistical decay code CGMF. This combination allows us to test the impact of utilizing theoretically-calculated fission fragment yields on the subsequent prompt neutron and γ-ray emission. We draw connections between the fragment yields and the total kinetic energy TKE of the fission fragments and demonstrate that the use of calculated yields can introduce a difference in the 〈TKE〉 and, thus, the prompt neutron multiplicity v, as compared with experimental fragment yields. We deduce the uncertainty on the 〈TKE〉 and v from this procedure and identify possible applications.
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26

Talou, Patrick, Toshihiko Kawano y Ionel Stetcu. "Prompt Fission Neutrons and Gamma Rays in a Monte Carlo Hauser-Feshbach Formalism". Physics Procedia 47 (2013): 39–46. http://dx.doi.org/10.1016/j.phpro.2013.06.007.

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27

Rauscher, T., F. K. Thielemann y K. L. Kratz. "Applicability of the Hauser-Feshbach approach for the determination of astrophysical reaction rates". Nuclear Physics A 621, n.º 1-2 (agosto de 1997): 331–34. http://dx.doi.org/10.1016/s0375-9474(97)00266-2.

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28

Yavshits, S. y O. Grudzevich. "Description of Nucleon Induced Fission in Intranuclear Cascade -Multiparticle Preequilibrium - Hauser-Feshbach Approach". EPJ Web of Conferences 2 (2010): 14006. http://dx.doi.org/10.1051/epjconf/20100214006.

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29

GIRI, MANJU y J. P. GUPTA. "THE BEST FIT VALUES OF K PARAMETER FOR (n, p) REACTIONS". International Journal of Modern Physics E 03, n.º 04 (diciembre de 1994): 1149–56. http://dx.doi.org/10.1142/s0218301394000346.

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The semiclassical exciton model which is generally used for describing the pre-equilibrium emission at a moderate excitation energy, contains various free parameters; among them the strength factor K of the two-body residual interaction plays an important role in the computation work. With the view of fixing the free parameter K for (n, p) reactions, the excitation functions for about eight nuclei have been calculated using exciton model in combination with Hauser-Feshbach formalism. The average best fit values of the exciton model free parameter K has been found to be K=700 MeV3. Departure from this value appears to cancel out structure effects introduced into transition rates through the structure-sensitive single particle level density.
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30

Adamczyk, Anne M., John W. Norbury y Lawrence W. Townsend. "Weisskopf–Ewing and Hauser–Feshbach calculations of photonuclear cross sections used for electromagnetic dissociation". Radiation Physics and Chemistry 90 (septiembre de 2013): 21–25. http://dx.doi.org/10.1016/j.radphyschem.2013.04.027.

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31

KAWANO, Toshihiko, Patrick TALOU, Mark B. CHADWICK y Takehito WATANABE. "Monte Carlo Simulation for Particle and γ-Ray Emissions in Statistical Hauser-Feshbach Model". Journal of Nuclear Science and Technology 47, n.º 5 (mayo de 2010): 462–69. http://dx.doi.org/10.1080/18811248.2010.9711637.

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32

Friedman, W. A. y P. A. Mello. "Information theory and statistical nuclear reactions II. Many-channel case and Hauser-Feshbach formula". Annals of Physics 161, n.º 2 (mayo de 1985): 276–302. http://dx.doi.org/10.1016/0003-4916(85)90081-8.

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33

Managlia, Maria Vittoria, Mauro Bruno, Michela D’Agostino, Luca Morelli, Giorgio Baiocco, Francesca Gulminelli, Catalin Frosin et al. "Four α-particles as a final state of 16O* Quasi Projectile decay". EPJ Web of Conferences 223 (2019): 01036. http://dx.doi.org/10.1051/epjconf/201922301036.

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Four α-particles as a final state of 16O* quasi-projectile decayproduced in peripheral 16O+12C reactions at 130 MeV is thoroughly studied. The differentdecay channels leading to the four α-particles final state are reconstructed by carrying out an event-by-event analysis of α correlations in the population of intermediate 8Be and 12C. Although small, a non negligible contribution due to 8Begs evaporation is found.A comparison between predictions of an accurate Hauser-Feshbach decay code and branching ratios of the different decay channels is performed. Significant deviations are observed, among these the Hoyle state population which is considerably lower than the one predicted according to the statistical model, thus suggesting possible structure effects in the Coulomb barrier and/or in the transmission coefficients.
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34

Nicolis, N. G. "Development of a Monte-Carlo Evaporation Code for Multiple-Fragment Emission". HNPS Advances in Nuclear Physics 12 (30 de agosto de 2021): 136. http://dx.doi.org/10.12681/hnps.3353.

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An extended Hauser-Feshbach approach has been employed in a multi-step Monte-Carlo evaporation code designed to study the de-excitation of highly excited compound nuclei. The code is intended to account for emission of light particles ($\gamma$, n, $^{1,2,3}$H, $^{3-6}$He) and intermediate mass fragments in their ground and excited states (particle-bound or unbound). As a study case, we consider the decay of the compound nucleus $^{120}$Te$^*$ at excitation energy 100, 200 and 300 MeV. First chance decay widths are compared with treatments based on the Weisskopf and the s-wave approximation. Preliminary calculations are compared with experimental isotopic yields of intermediate mass fragments emitted in E/A = 50 MeV $^{4}$He + $^{116,124}$Sn $\rightarrow$ $^{120,128}$Te$^*$ reactions.
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35

A. Cizewski, Jolie y Andrew Ratkiewicz. "Neutron capture on short-lived nuclei via the surrogate (d,pγ) reaction". EPJ Web of Conferences 178 (2018): 03003. http://dx.doi.org/10.1051/epjconf/201817803003.

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Rapid r-process nucleosynthesis is responsible for the creation of about half of the elements heavier than iron. Neutron capture on shortlived nuclei in cold processes or during freeze out from hot processes can have a significant impact on the final observed r-process abundances. We are validating the (d,pγ) reaction as a surrogate for neutron capture with measurements on 95Mo targets and a focus on discrete transitions. The experimental results have been analyzed within the Hauser-Feshbach approach with non-elastic breakup of the deuteron providing a neutron to be captured. Preliminary results support the (d,pγ) reaction as a valid surrogate for neutron capture. We are poised to measure the (d,pγ) reaction in inverse kinematics with unstable beams following the development of the experimental techniques.
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36

Okumura, Shin, Toshihiko Kawano y Satoshi Chiba. "Prompt and Delayed Neutron Emissions and Fission Product Yield Calculations with Hauser-Feshbach Statistical Decay Theory and Summation Calculation Method". EPJ Web of Conferences 211 (2019): 04005. http://dx.doi.org/10.1051/epjconf/201921104005.

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We demonstrate the neutron emission and fission product yield calculations using the Hauser–Feshbach Fission Fragment Decay (HF3D) model and β decay. The HF3D model calculates the statistical decay of more than 500 primary fission fragment pairs formed by the neutron induced fission of 235U. In order to calculate the prompt neutron and photon emissions, the primary fission fragment distributions, i.e. mass, charge, excitation energy, spin and parity are deterministically generated and numerically integrated for all fission fragments. The calculated prompt neutron multiplicities, independent fission product yield are fully consistent each other. We combine the β-decay and the summation calculations with the HF3D model calculation to obtain the cumulative fission product yield, decay heat and delayed neutron yield. The calculated fission observables are compared with available experimental data.
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37

Guo, Hairui, Yinlu Han, Tao Ye, Weili Sun y Wendi Chen. "Theoretical calculation and evaluation of neutron inducedreactions on Pu isotopes". EPJ Web of Conferences 239 (2020): 03008. http://dx.doi.org/10.1051/epjconf/202023903008.

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The nuclear data on n+239,240,242,244Pu reactions for the incident energy up to 200 MeV are consistently calculated and evaluated in order to meet the design requirements of Generation-IV reactors and accelerator driven systems. The optical model, the distorted wave Born approximation theory, the Hauser-Feshbach theory, the fission model, the evaporation model, the exciton model and the intranuclear cascade model are used in the calculation, and new experimental data are taken into account. Our data are compared with experimental data and the evaluated data from JENDL-4/HE and TENDL. In addition, the variation tendency of reaction cross sections related to the target mass numbers is obtained, which is very important for the prediction of nuclear data on neutron-actinides reactions because the experimental data are lacking.
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38

KAWANO, Toshihiko, Patrick TALOU, Mark B. CHADWICK y Takehito WATANABE. "Particle-Gamma and Particle-Particle Correlations in Nuclear Reactions Using Monte Carlo Hauser-Feshbach Model". Progress in Nuclear Science and Technology 2 (1 de octubre de 2011): 757–61. http://dx.doi.org/10.15669/pnst.2.757.

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39

VON OERTZEN, WOLFRAM. "ALPHA-CLUSTERS IN N=Z NUCLEI AND COHERENT EMISSION OF 2α- and 3α-CLUSTERS FROM EXCITED COMPOUND NUCLEI". International Journal of Modern Physics E 17, n.º 10 (noviembre de 2008): 2129–35. http://dx.doi.org/10.1142/s0218301308011215.

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Conditions for a phase change with the formation of an α-particle condensate in excited N = Z nuclei, a dilute Bose-Gas, are discussed for excitation energies around EBα = 0, These are second order phase transitions in a mixed gas of Fermions and Bosons. The de-Broglie wavelength of relative motion for α-particles in these states is much larger then the nuclear radii. The experimental observation of the decay of such condensed α-particle states is proposed, with the coherent emission of several correlated α-particles, a decay not described by the Hauser-Feshbach approach for statistical compound nucleus decay. Examples of such observations with the enhanced emission of unbound resonances of 8 Be and [Formula: see text] — clusters are discussed. The experiments involved the ISIS-GASP-detection systems at the Laboratorii Nationale di Legnaro.
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40

Jaffke, P., P. Talou, M. Devlin y N. Fotiades. "Using CGMF to estimate corrections for fission yields measured via γ-ray spectroscopy". EPJ Web of Conferences 242 (2020): 03003. http://dx.doi.org/10.1051/epjconf/202024203003.

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Fission product yields have been inferred using γ-ray spectroscopy for several decades. Typically, these efforts have focused on even-Z even-A fission products as their nuclear structure are less complicated. To further simplify the situation, it is often assumed that no side-feeding to the ground-state occurs and multiplicity cuts have a negligible effect on the inferred yields. Using CGMF, a Hauser-Feshbach statistical decay model for the primary fission fragments, we estimate the impact of these assumptions and determine corrections for specific fission product yields. We report on these corrections and investigate their sensitivity to various nuclear parameters, specifically the spin distribution of the fission fragments and the assumed nuclear structure. Our results indicate that even in the simplest of cases, say the 2+ → 0+ transitions in even-Z even-A fragments, average level corrections are on the order of 75%.
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41

Fu, C. Y. "Approximation of Precompound Effects in Hauser-Feshbach Codes for Calculating Double Differential (n, xn) Cross Sections". Nuclear Science and Engineering 100, n.º 1 (septiembre de 1988): 61–76. http://dx.doi.org/10.13182/nse88-a29015.

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42

Singh, B. P., H. D. Bhardwaj y R. Prasad. "A study of pre-equilibrium emission in α-induced reactions on 121,123Sb". Canadian Journal of Physics 69, n.º 11 (1 de noviembre de 1991): 1376–82. http://dx.doi.org/10.1139/p91-205.

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Excitation functions for the 121Sb (α, n)+ 123Sb(α, 3n),,21Sb(α, 2n)+ 123Sb(α, 4n), 121Sb(α, 4n), 121Sb(α, 3np), and 123Sb(α, n) reactions are measured in the energy range 30–60 MeV using the stacked foil technique. In the cases of the 121Sb(α, n)+ 123Sb(α, 3n) and 121Sb(α, 2n)+ 123Sb(α, 4n) reaction pairs, the excitation functions for individual reactions were deduced using theoretical calculations. Excitation functions are also calculated theoretically using the compound-nucleus model with and without the inclusion of a pre-equilibrium emission. As expected, inclusion of a pre-equilibrium contribution based on the exciton model along with compound-nucleus calculations using the Hauser–Feshbach formalism reproduces well the measured excitation functions. Analysis of the data indicates a preference for a first chance neutron emission over charged-particle emission, and interesting trends in the energy and mass-number dependence of the pre-equilibrium fraction are observed.
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43

Okumura, Shin, Toshihiko Kawano, Patrick Jaffke, Patrick Talou y Satoshi Chiba. "235U(n, f) Independent fission product yield and isomeric ratio calculated with the statistical Hauser–Feshbach theory". Journal of Nuclear Science and Technology 55, n.º 9 (junio de 2018): 1009–23. http://dx.doi.org/10.1080/00223131.2018.1467288.

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44

Zyriliou, A., A. Khaliel y T. J. Mertzimekis. "On the Experimental Investigation of the Angular Distributions in the Reaction 112Cd(p,γ)113In". HNPS Proceedings 26 (1 de abril de 2019): 188. http://dx.doi.org/10.12681/hnps.1818.

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Some of the mid–weight nuclei lie in the region of the isotopic chart where the astrophysical p-process has a prominent role in the nucleosynthetic scenarios. Experimentally deduced reaction cross section data can provide stringent tests for the astrophysical models, especially at low energies. In this framework, the reaction 112Cd(p,γ)113In has been studied experimentally at four proton beam energies 2.8 ≤ Ep≤ 3.4 MeV, partly inside the astrophysically interesting Gamow window. Proton beams were provided by the 5.5 MV T11 Van de Graaff Tandem Accelerator of the Institute of Nuclear Physics of the National Center for Scientific Research (NCSR) “Demokritos”. In–beam spectroscopy was carried out with an array of four HPGe detectors sitting on a rotating table. In total, eight (8) different angles were used to record gamma–ray spectra. Special focus was given on constructing the angular distribution of each gamma–ray feeding the ground state of 113In directly, so as to determine the reaction cross sections from the in–beam data, exclusively. The resulting cross sections were compared to Hauser–Feshbach calculations using the code TALYS v1.9.
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45

Yiğit, M. y M. E. Korkmaz. "On the behavior of cross-sections of charged particle-induced reactions of 181Ta target". Modern Physics Letters A 33, n.º 26 (24 de agosto de 2018): 1850155. http://dx.doi.org/10.1142/s0217732318501559.

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The production of nuclear energy from fusion reaction with no CO2 emission is one of the most attractive sources for the future. The unprecedented physical and mechanical properties for structural materials are very important in the nuclear fusion reactor design. So, tantalum material is a valuable candidate for plasma-facing materials in the fusion devices. In this paper, nuclear excitation functions for the [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] reactions are obtained using the nuclear codes TALYS 1.8 and ALICE/ASH. The contribution of pre-equilibrium and equilibrium processes in these reactions is investigated. In the calculations, the Weisskopf–Ewing and Hauser–Feshbach formalisms for the equilibrium particle emission, and the two-component exciton, hybrid and geometry-dependent hybrid formalisms for the pre-equilibrium particle emission are used. Hence, the cross-sections calculated are compared with the measured values. It is observed that the cross-section results of the geometry-dependent hybrid model match fairly well with the experimental measurements.
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46

Regniera, D., O. Litaizea y O. Serota. "Preliminary Results of a Full Hauser-feshbach Simulation of the Prompt Neutron and Gamma Emission from Fission Fragments". Physics Procedia 47 (2013): 47–52. http://dx.doi.org/10.1016/j.phpro.2013.06.008.

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47

Stankovskiy, A. Yu y A. Yu Konobeyev. "CASCADEX—A combination of intranuclear cascade model from CASCADE/INPE with the Hauser–Feshbach evaporation/fission calculations from TALYS". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 594, n.º 3 (septiembre de 2008): 420–24. http://dx.doi.org/10.1016/j.nima.2008.07.025.

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48

Fu, C. Y., F. B. Guimaraes y L. C. Leal. "Combining Intranuclear-Cascade and Preequilibrium Hauser-Feshbach Models for Nuclear Cross-Section Calculations between 1 MeV and 5 GeV". Nuclear Science and Engineering 143, n.º 2 (febrero de 2003): 164–76. http://dx.doi.org/10.13182/nse03-a2327.

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49

ODANO, Naoteru, Shin IWASAKI y Kazusuke SUGIYAMA. "Estimate of (n, p) Cross Section for Unstable Nuclide60Co by Multi-Step Hauser-Feshbach Model with Pre-Equilibrium Correction". Journal of Nuclear Science and Technology 30, n.º 10 (octubre de 1993): 1030–37. http://dx.doi.org/10.1080/18811248.1993.9734584.

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50

KAWANO, Toshihiko, Toshiya SANAMI, Mamoru BABA y Hideki NAKASHIMA. "Analysis of58Ni(n, α) Reaction Cross Sections with the Hauser-Feshbach Statistical Theory and the Bayesian Parameter Estimation Method". Journal of Nuclear Science and Technology 36, n.º 3 (marzo de 1999): 256–64. http://dx.doi.org/10.1080/18811248.1999.9726206.

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