Neptunium radioactive isotope number 1: 225Np |
| Neutrons: | 132; |
| Jn: | 9/2-; |
| Decay: | α : 100.00 %; |
| t1/2: | 2E-06s ≈ 2.00 µs; |
Neptunium radioactive isotope number 2: 226Np |
| Neutrons: | 133; |
| Jn: | Unknown; |
| Decay: | α : 100.00 %; |
| t1/2: | 0.035s ≈ 35.00 ms; |
Neptunium radioactive isotope number 3: 227Np |
| Neutrons: | 134; |
| Jn: | Unknown; |
| Decay: | α : 100.00 %; |
| t1/2: | 0.51s ; |
Neptunium radioactive isotope number 4: 228Np |
| Neutrons: | 135; |
| Jn: | Unknown; |
| Decay: | ε : 60.00 %
α : 40.00 %; |
| t1/2: | 61.4s ; |
Neptunium radioactive isotope number 5: 229Np |
| Neutrons: | 136; |
| Jn: | Unknown; |
| Decay: | α : 68.00 %
ε : 32.00 %; |
| t1/2: | 240s ≈ 4.00 m; |
Neptunium radioactive isotope number 6: 230Np |
| Neutrons: | 137; |
| Jn: | Unknown; |
| Decay: | ε ≤ 97.00 %
α ≥ 3.00 %; |
| t1/2: | 276s ≈ 4.60 m; |
Neptunium radioactive isotope number 7: 231Np |
| Neutrons: | 138; |
| Jn: | 5/2; |
| Decay: | ε : 98.00 %
α : 2.00 %; |
| t1/2: | 2928s ≈ 48.80 m; |
Neptunium radioactive isotope number 8: 232Np |
| Neutrons: | 139; |
| Jn: | 4+; |
| Decay: | ε : 100.00 %
α : 2.0E-4 %; |
| t1/2: | 882s ≈ 14.70 m; |
Neptunium radioactive isotope number 9: 233Np |
| Neutrons: | 140; |
| Jn: | 5/2+; |
| Decay: | ε : 100.00 %
α ≤ 1.0E-3 %; |
| t1/2: | 2172s ≈ 36.20 m; |
Neptunium radioactive isotope number 10: 234Np |
| Neutrons: | 141; |
| Jn: | 0+; |
| Decay: | ε : 100.00 %; |
| t1/2: | 380160s ≈ 4.40 d; |
Neptunium radioactive isotope number 11: 235Np |
| Neutrons: | 142; |
| Jn: | 5/2+; |
| Decay: | ε : 100.00 %
α : 2.6E-3 %; |
| t1/2: | 34223040s ≈ 1.09 y; |
Neptunium radioactive isotope number 12: 236Np |
| Neutrons: | 143; |
| Jn: | 6-; |
| Decay: | ε : 86.30 %
β - : 13.50 %
α : 0.16 %; |
| t1/2: | 4.825008E+12s ≈ 1.530000e+5 y; |
Neptunium radioactive isotope number 13: 236Np |
| Neutrons: | 143; |
| Jn: | 1; |
| Decay: | β - : 50.00 %
ε : 50.00 %; |
| t1/2: | 81000s ≈ 22.50 h; |
Neptunium radioactive isotope number 14: 237Np |
| Neutrons: | 144; |
| Jn: | 5/2+; |
| Decay: | α : 100.00 %
SF ≤ 2E-10 %; |
| t1/2: | 6.761318E+13s ≈ 2.144000e+6 y; |
Neptunium radioactive isotope number 15: 238Np |
| Neutrons: | 145; |
| Jn: | 2+; |
| Decay: | β - : 100.00 %; |
| t1/2: | 182908.8s ≈ 2.12 d; |
Neptunium radioactive isotope number 16: 239Np |
| Neutrons: | 146; |
| Jn: | 5/2+; |
| Decay: | β - : 100.00 %; |
| t1/2: | 203558.4s ≈ 2.36 d; |
Neptunium radioactive isotope number 17: 240Np |
| Neutrons: | 147; |
| Jn: | 5+; |
| Decay: | β - : 100.00 %; |
| t1/2: | 3714s ≈ 1.03 h; |
Neptunium radioactive isotope number 18: 240Np |
| Neutrons: | 147; |
| Jn: | 1+; |
| Decay: | β - : 99.88 %
IT : 0.12 %; |
| t1/2: | 433.2s ≈ 7.22 m; |
Neptunium radioactive isotope number 19: 241Np |
| Neutrons: | 148; |
| Jn: | 5/2+; |
| Decay: | β - : 100.00 %; |
| t1/2: | 834s ≈ 13.90 m; |
Neptunium radioactive isotope number 20: 242Np |
| Neutrons: | 149; |
| Jn: | 1+; |
| Decay: | β - : 100.00 %; |
| t1/2: | 132s ≈ 2.20 m; |
Neptunium radioactive isotope number 21: 242Np |
| Neutrons: | 149; |
| Jn: | 6+; |
| Decay: | β - : 100.00 %; |
| t1/2: | 330s ≈ 5.50 m; |
Neptunium radioactive isotope number 22: 243Np |
| Neutrons: | 150; |
| Jn: | 5/2-; |
| Decay: | β - : 100.00 %; |
| t1/2: | 111s ; |
Neptunium radioactive isotope number 23: 244Np |
| Neutrons: | 151; |
| Jn: | 7-; |
| Decay: | β - : 100.00 %; |
| t1/2: | 137.4s ≈ 2.29 m; |