Look Up Calculated One-Neutron and
Two-Neutron Separation Energies

Enter proton number Z:

Enter mass number A:

Look up S1n and S2n:

Downloading the neutron separation-energy data file


 The entire data file of calculated one-neutron separation energies S1n and two-neutron separation energies S2n may be downloaded here The format of the file is, in FORTRAN notation (2I5,2f10), and each record contains:

Z, N, S1n (MeV), S2n (MeV)

If the proton separation energy can not be calculated because the ground-state masses required for the determination were not calculated then the value -20000.00 is listed.

Page by Robert MacFarlane and Peter Möller
ryxm@lanl.gov, moller@lanl.gov
created 4 March 1997, last modified 1 May 2012