Welcome to NUMOR, the Nuclear Moments and Charge Radii Database
A compilation of non-evaluated experimental data | Database cut-off date: 2019.03.31





 <  Neptunium (Z=93)  > 
237Np 239Np

Isotope Mass Excess [keV] Energy [keV] t1/2 Spin/Parity μ [nm] Q [b] R [fm] Ref. Std Method NSR keyword doi Comment
237Np 44873.5 ± 1.8 0. 2.1 x 10^6 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 R Mu-X , Pi-X , ME 1987DE10
1969DU09
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) R [237Np] ME 1968PI01
1968ST03

10.1103/PhysRev.165.1319

  [▶InPACS] Shapes and deformations



Plotting systematics is still in beta, use with caution.

Data points here: [ CSV ]

Data points here: [ CSV ]








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