93-Np-237
 basic
 n-XS summary
 XS graphs

 element
93-neptunium-237

  • Atomic Mass: 237.0481673 +- 0.0000021 amu
  • Excess Mass: 44867.501 +- 1.961 keV
  • Binding Energy: 1795277.138 +- 1.986 keV
  • Beta Decay Energy: B- -220.318 +- 1.298 keV
"The 1995 update to the atomic mass evaluation" by G.Audi and A.H.Wapstra, Nuclear Physics A595 vol. 4 p.409-480, December 25, 1995.
  • Spin: 5/2+
  • Half life: 2144000 years
  • Mode of decay: Alpha to Pa-233
    • Decay energy: 4.959 MeV
  • Mode of decay: SF
    • Branch ratio: <=2E-10 %

    Meta state at 2.800 Mev
  • Half life: 45 ns
  • Mode of decay: SF
    • Branch ratio: <=100.00 %
    • Decay energy: 0 0.000 MeV

  • Possible parent nuclides:
    Beta from U-237
    Electron capture from Pu-237
    Alpha from Am-241
R.R.Kinsey, et al.,The NUDAT/PCNUDAT Program for Nuclear Data,paper submitted to the 9 th International Symposium of Capture-Gamma_raySpectroscopy and Related Topics, Budapest, Hungary, Octover 1996.Data extracted from NUDAT database (Jan. 14/1999)
Magnetic Dipole Moments and Electric Quadrupole Moments
Ex(kev)T1/2Spin    m(nm)    Q(b)    Ref. Std.MethodReference
02.1x10*6y5/2+ +3.14(4) "EPR, R"JCP 53 809 (70)
+~2.9 MEPR 165 1319 (68)
+3.866(6) a "Mu-X, Pi-X, ME"PL 189B 7 (87)/PR 186 1296 (69)
6068 ns5/2- +1.68(3) [237Np]MEPR 171 316 (68)/JCP 53 809 (70)
+1.95(15) TDPACNP A104 588 (67)
+3.85(4) [237Np]MEBAPS 13 28 (68)
N. J. Stone, Table of Nuclear Magnetic Dipole and Electric Quadrupole Moments, to be published.  2000 Courtesy of T. Burrows at BNL/NNDC.