Difference of a20 between protons and neutrons

Last modification: 1996/3/21
A figure ( GIF file of 4.9KB or PS file of 39KB ) presents a comparison of the values of a40 between protons and neutrons for the ground states of 1029 even-even nuclei (denoted by plus symbols) and the first-excited solution of 758 even-even nuclei for HF+BCS with SIII force. The r.m.s. difference is 0.0063, while the largest differences occur in the ground state of the nuclei indicated by letters from A to G. We tabulate these nuclei below: 
Symbol  Nucleus    a40neu    a40pro
A       16Be      -0.127   -0.031
B       10Be       0.065    0.002
C       18Mg      -0.004   -0.065
D       22Mg       0.063    0.004
E       22Ne       0.005    0.063
F       22S        0.000   -0.045
G       18C       -0.048   -0.005
Among these nuclei, 18$Mg and 22S are outside the proton drip line.