GEFY | Based fission-fragment Yield library in ENDF-format

Here you can download GEF-based fission-fragment yields in ENDF format

    GEFY 9.1 | December 2023

    Independent and cumulative fission-fragment yields.

    Multi-chance fission is considered.

    Uncertainties reflect the uncertainties of the model. They are determined from calculations with perturbed model parameters. For this purpose, a series of calculations was performed with different sets of model parameters. Each parameter in these sets was varied randomly with a standard deviation corresponding to the uncertainty of the respective parameter deduced from the fit to experimental fission data.

    Isomeric independent yields and cumulative yields were calculated using the decay data of JEFF 3.3. Nuclides with half-lives longer than 1.E6 years were treated as stable. Very neutron-rich fragments, for which no experimental decay information is available, were assumed to decay by beta-minus decay only.

    The calculations have been performed with the GEF code, version version 2023/3.2

    Z

    TABLES OF INDEPENDENT AND CUMULATIVE FISSION-FRAGMENT YIELDS FOR DOWNLOAD :

    - Spontaneous fission for isotopes from Z = 89 to Z = 106. (Calculation with 106 events per system)

    - Neutron-induced fission of target nuclei of Z 86 to Z = 98 (En=thermal to En=30 MeV in 59 steps). (Calculation with 10^6 events per system). *)

    - Neutron-induced fission of target nuclei in isomeric states. (Half-life > 1 s). En=thermal to En=30 MeV in 59 steps. (Calculation with 106 events per system).

    Energy steps in MeV : 0.0253E-6, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30

    See below the table with isomeric states.

    * The tables that were given here before were calculated with only part of the isomers of JEFF-3.3 taken into account by a technial problem. The new tables are still incomplete.

      See below the table with isomeric states.

      GEFY 8.1 | July 2020

      Independent and cumulative fission-fragment yields.

      Multi-chance fission is considered.

      Uncertainties reflect the uncertainties of the model. They are determined from calculations with perturbed model parameters. For this purpose, a series of calculations was performed with different sets of model parameters. Each parameter in these sets was varied randomly with a standard variation corresponding to the uncertainty of the respective parameter deduced from the fit to experimental fission data.

      Isomeric independent yields and cumulative yields were calculated using the decay data of JEFF 3.3. Nuclides with half-lives longer than 1.E6 years were treated as stable. Very neutron-rich fragments, for which no experimental decay information is available, were assumed to decay by beta-minus decay only.

      The calculations have been performed with the GEF code, version version 2020/1.1

      Correction of interpolation scheme applied in January 2021.

      Z

      TABLES OF INDEPENDENT AND CUMULATIVE FISSION-FRAGMENT YIELDS FOR DOWNLOAD :

      - Spontaneous fission for isotopes from Z = 89 to Z = 106. (Calculation with 106 events per system)

      - Neutron-induced fission of target nuclei of Z 86 to Z = 98 (En=thermal to En=30 MeV in 59 steps). (Calculation with 10^6 events per system). *)

      - Neutron-induced fission of target nuclei in isomeric states. (Half-life > 1 s). En=thermal to En=30 MeV in 59 steps. (Calculation with 106 events per system).

      Energy steps in MeV : 0.0253E-6, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30

      See below the table with isomeric states.

      * The tables that were given here before were calculated with only part of the isomers of JEFF-3.3 taken into account by a technial problem. The new tables are still incomplete.

        See below the table with isomeric states.

        GEFY 7.2 | September 2019

        Independent and cumulative fission-fragment yields.

        Multi-chance fission is considered.

        Uncertainties reflect the uncertainties of the model. They are determined from calculations with perturbed model parameters. For this purpose, a series of calculations was performed with different sets of model parameters. Each parameter in these sets was varied randomly with a standard variation corresponding to the uncertainty of the respective parameter deduced from the fit to experimental fission data.

        Cumulative yields were calculated using the decay data of JEFF 3.1.1. Nuclides with half-lives longer than 1.E6 years were treated as stable. Very neutron-rich fragments, for which no experimental decay information is available, were assumed to decay by beta-minus decay only.

        Z

        TABLES OF INDEPENDENT AND CUMULATIVE FISSION-FRAGMENT YIELDS FOR DOWNLOAD :

        - Spontaneous fission for isotopes from Z = 89 to Z = 106. (Calculation with 106 events per system)

        - Neutron-induced fission of target nuclei of Z 86 to Z = 98 (En=thermal to En=30 MeV in 59 steps). (Calculation with 10^6 events per system).

        - Neutron-induced fission of target nuclei in isomeric states. (Half-life > 1 s). En=thermal to En=30 MeV in 59 steps. (Calculation with 106 events per system)

        Energy steps in MeV : 0.0253E-6, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30

        See below the table with isomeric states.

        Isomeric states from ENSDF (Nuclear Wallet Cards database version of 6/1/2012) are listed in the table below. Values that are not known were replaced by zero.

        Nuclide E(isomer) Spin/parity Half-life (ENSDF) File name
        222Ac > 0 keV  ? 63 s GEFY_89_222m1_n.dat
        229Th 100 eV (3/2+) 2 min ? GEFY_90_229m1_n.dat
        234Pa 73.9 keV (0-) 1.159 min GEFY_91_234m1_n.dat
        235U 0.1 keV 1/2+ about 26 min GEFY_92_235m1_n.dat
        236Np > 0 keV 1 22.5 h GEFY_93_236m1_n.dat
        240Np > 0 keV (1+) 7.22 min GEFY_93_240m1_n.dat
        242Np > 0 keV (6+) 5.5 min GEFY_93_242m1_n.dat
        242Am 48.6 keV 5- 141 y GEFY_95_242m1_n.dat
        244Am 86.1 keV 1+ 26 min GEFY_95_244m1_n.dat
        246Am > 0 keV 2(-) 25.0 min GEFY_95_246m1_n.dat
        248Bk > 0 keV 1(-) 23.7 h GEFY_97_248m1_n.dat
        250Es > 0 keV 1(-) 2.22 h GEFY_99_250m1_n.dat
        254Es 83.7 keV 2+ 39.3 h GEFY_99_254m1_n.dat
        256Es > 0 keV (8+) 7.6 h GEFY_99_256m1_n.dat
        250Fm > 0 keV  ? 1.93 s GEFY_100_250m1_n.dat

         

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