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Deexcitation Modes in Spallation Nuclear Reactions

  • General and Applied Physics
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Abstract

Spallation nuclear reactions in the range of 0.2 to 1.2 GeV are studied using the CRISP code. A new approach for the deexcitation stage of the compound nucleus was introduced. For the calculations of the level densities, this approach is based on the Back-shifted Fermi gas model (BSFG), which takes into account pairing effects and shell corrections, whereas the calculation of the fission barriers were performed by means of the Extended Thomas-Fermi plus Strutinsky Integral (ETFSI) method, which is a high-speed approximation to the Hartree-Fock method with pairing correlations treated as in the usual BCS plus blocking approach. This procedure is more appropriate to calculate level densities for exotic nuclei. Satisfactory results were obtained and compared with experimental data obtained in the GSI experiments. As another important result, we highlight some directions for the development of a qualitatively superior version of the CRISP code with the implementation of more realistic and suitable physical models to be applied in stable and exotic nuclei that participate in the process. This new version of the code includes several substantial changes in the decay of the hot compound nucleus which allow satisfactory agreement with the experimental data and a reduction of the adjustment parameters.

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Acknowledgments

Part of this work was made in the frame of the academic cooperation agreement between UESC and InSTEC. O. Rodríguez and F. Guzmán would like to recognize the provisions of UESC for the conclusion of this work. F. Guzman would also like to thank the SBF (Sociedade Brasileira de Física) for the financial support of PLAF/SBF/CNPq in the frame of the Catedra Itinerante program. O. Tumbarell would like to thank the FAPESB (Fundação de Amparo à Pesquisa do Estado da Bahia) for the financial support. A.R. Samana thanks the financial support of AUXPE-FAPESB-3336/2014/Processo no: 23038.007210/2014-19 for the visit of F. Guzmán to the UESC-BA while performing this work. A. Deppman thanks the financial support of CNPq/305639/2010-2. D. A. Souza thanks the financial support of CAPES. And finally, the authors thank the financial support of Conselho Nacional de Desenvolvimento Cientfico e Tecnológico (CNPq).

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Authors and Affiliations

  1. Universidade Estadual de Santa Cruz - UESC, Rodovia Ilhéus-Itabuna km 16, Ilhéus, 45662-900, Brazil

    F. G. Velasco, O. Tumbarell & A. R. Samana

  2. Departamento de Física Nuclear, Instituto Superior de Tecnologías y Ciencias Aplicadas - INSTEC, Av. Salvador Allende No. 1110 Quinta de los Molinos, La Habana, 6163, Cuba

    F. Guzmán & O. Rodriguez

  3. Instituto Federal de Educação Ciência e Tecnologia da Bahia - IFBA. Campus Ilhéus, Rodovia Ilhéus-Itabuna km 13, Ilhéus, 45600-045, Brazil

    D. A. Souza

  4. Instituto de Física da Universidade de São Paulo-IFUSP, Rua do Matão Travessa R Nr.187, São Paulo, 05508-090, Brazil

    E. Andrade-II, J. L. Bernal Castillo & A. Deppman

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  1. F. G. Velasco
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  2. F. Guzmán
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  3. O. Rodriguez
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  4. O. Tumbarell
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  7. E. Andrade-II
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  8. J. L. Bernal Castillo
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  9. A. Deppman
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Correspondence to F. G. Velasco.

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Velasco, F.G., Guzmán, F., Rodriguez, O. et al. Deexcitation Modes in Spallation Nuclear Reactions. Braz J Phys 46, 415–423 (2016). https://doi.org/10.1007/s13538-016-0430-7

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  • DOI: https://doi.org/10.1007/s13538-016-0430-7

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