def thePu239_alpha
      array = Array.new(23)

      array[0] = 2.083E-01
      array[1] = 3.853E-01
      array[2] = 2.213E-01
      array[3] = 9.460E-02
      array[4] = 3.531E-02
      array[5] = 2.292E-02
      array[6] = 3.946E-03
      array[7] = 1.317E-03
      array[8] = 7.052E-04
      array[9] = 1.432E-04
      array[10] = 1.765E-05
      array[11] = 7.347E-06
      array[12] = 1.747E-06
      array[13] = 5.481E-07
      array[14] = 1.671E-07
      array[15] = 2.112E-08
      array[16] = 2.996E-09
      array[17] = 5.107E-11
      array[18] = 5.730E-11
      array[19] = 4.138E-14
      array[20] = 1.088E-15
      array[21] = 2.454E-17
      array[22] = 7.557E-17

      array
    end
def thePu239_alpha
      array = Array.new(23)

      array[0] = 2.083E-01
      array[1] = 3.853E-01
      array[2] = 2.213E-01
      array[3] = 9.460E-02
      array[4] = 3.531E-02
      array[5] = 2.292E-02
      array[6] = 3.946E-03
      array[7] = 1.317E-03
      array[8] = 7.052E-04
      array[9] = 1.432E-04
      array[10] = 1.765E-05
      array[11] = 7.347E-06
      array[12] = 1.747E-06
      array[13] = 5.481E-07
      array[14] = 1.671E-07
      array[15] = 2.112E-08
      array[16] = 2.996E-09
      array[17] = 5.107E-11
      array[18] = 5.730E-11
      array[19] = 4.138E-14
      array[20] = 1.088E-15
      array[21] = 2.454E-17
      array[22] = 7.557E-17

      array
    end
thePu239_alpha is alpha in ANS-5.1-1979 Table 8.