Neptunium (Z=93)
237Np 239Np
Recommended† magnetic dipole moments
Isotope Energy [keV] t1/2 Spin/Parity μ [nm] Method Recommended Tables
237Np 0 2.1 x 106 y 5/2+ +3.16(10) INDC(NDS)-0794
60 67 ns 5/2- +1.85(20) ME INDC(NDS)-0816


Recommended† electric quadrupole moments
Isotope Energy [keV] t1/2 Spin/Parity Q [b] Method Recommended Tables
237Np 0 2.1 106 y 5/2+ +3.886(6) Mu-X INDC(NDS)-0833
60 67 ns 5/2- +3.85(4) ME INDC(NDS)-0833


Compiled‡ magnetic dipole and electric quadrupole moments from published articles
Isotope Energy [keV] t1/2 Spin/Parity μ [nm] Q [b] Ref. Std Method NSR keyword doi
237Np 0. 2.1×106 y 5/2+ +3.14(4) EPR , R 1970LE29 10.1063/1.1674064
~ +2.9 ME 1968ST03 10.1103/PhysRev.165.1319
+3.866(6) a Mu-X , Pi-X , ME 1987DE10
1969DU09
2013STZZ		 10.1016/0370-2693(87)91260-3
10.1103/PhysRev.186.1296
60. 68 ns 5/2- +1.68(3) [237Np] ME 1968DU02
1970LE29		 10.1103/PhysRev.171.316
10.1063/1.1674064
+1.95(15) TDPAC 1967GU08 10.1016/0375-9474(67)90476-9
+3.85(4) [237Np] ME 1968PI01
1968ST03
2013STZZ
10.1103/PhysRev.165.1319

† Recommended magnetic moments are for the bare nucleus with published results corrected consistently for diamagnetism (including error estimate).
  Where appropriate published results are also adjusted to the most recent adopted half-life for the state.
  Recommended quadrupole moments are adjusted using the best electric field gradient calculation for the system concerned.
  For details see the Reports referenced.

‡ In this listing published results are given without adjustment or correction.