Update b_c values for Li, Pr, Nd, Sm, Eu and Yb plus isotopes (Gehlhaar 2025 and 2026)

[pkienzle]

    6Li b_c 2.0(1) => 2.27(2) [8]
    7Li b_c -2.22(2) => -2.28(2) [8]
    natLi b_c -1.90(3) => -1.93(2) [8]
    ...
    141Pr b_c 4.58(5) => 4.44(4) [9]
    natNd b_c 7.69(5) => 7.87(11) [9]
    142Nd b_c 7.7(3) => 7.24(4) [9]
    143Nd b_c 14.0(2.0) => 17.51(6) [9]
    144Nd b_c 2.8(3) => 3.06(7) [9]
    145Nd b_c 14.0(2.0) => 10.40(12) [9]
    146Nd b_c 8.7(2) => 8.56(9) [9]
    148Nd b_c 5.7(3) => 4.44(13) [9]
    150Nd b_c 5.28(20) => 6.87(5) [9]
    144Sm b_c -3.0(4.0) => 4.63(4) [11] calculated
    147Sm b_c 14.0(3.0) => 6.68(5) [9]
    148Sm b_c -3.0(4.0) => 6.67(7) [9]
    149Sm b_c 18.7(28) => 17.84(28) [11]
    150Sm b_c 14.0(3.0) => 10.05(10) [9]
    152Sm b_c -5.0(6) => -6.14(12) [9]
    154Sm b_c 8.0(1.0) => 8.97(6) [4] => 9.34(9) [9]
    153Eu b_c 8.22(12) => 8.85(3) [4] => 8.33(11) [9]
    174Yb b_c 19.2(1) => 22.02(7) [9]
    ...
    [8] Gehlhaar (2025) 10.1088/1361-648X/add3a6
    [9] Gehlhaar (2026) 10.1088/1361-648X/ae1ec0