Nucleus[1] Binding energy (MeV) g.s. Radius[3] & Deformation[4]
23793Np144   Neptunium
J(π)=5/2+
T1/2=2.14e+6 y
  Experiment
[2]		 Theory
[4]		 Sh.corr.
[4]
Mass Excess 44.873466
(0.001798)		 45.140 -1.710
BE 1795.271 1795.004
BE/A 7.575 7.574
<R2ch>1/2 = 
Charge-density Distribution [6]

β2= 0.226
β3= 0.000
β4= 0.108
β6= -0.009
Excited States[1]
click on a plot to process it 		Known and possible Decays[1] Q-values (keV)
roman [2], italic [4]
α - decay4958.52
β- - decay-219.97
β+ - decay-1540.62
e-capture-518.62
1p - decay-4862.05
2p - decay-11993.43
1n - decay-6577.27
2n - decay-12314.01
2β- - decay-1697.46
β-,n-6100.65
β-,2n-13452.93
β-,d-9307.07
β-,t-10032.97
β-,α5528.35
β-,n,α-233.57
EC,p-7749.52
EC,2p-13722.32
EC,α3714.89
Metastable states and Resonances[1] Radiation energies (keV)[1] Thermal neutrons[1] El.-Magn. properties[5,7,8]
 
E = 945.2 keV
T1/2 = 710.00 ns
IT
100%
E = 2800 keV
T1/2 = 45.00 ns
SF
100%
α-energies
γ-energies
σ (b)
Capture 175.90
Fission 0.02
 
μ (nm) Q (b) E* (keV)
+3.85(4)60
+3.886(6)0
+3.14(4)0
~+2.90
+1.68(3)60
+1.95(15)60
  
[1] National Nuclear Data Center, Evaluated Nuclear Structure Data File, https://www.nndc.bnl.gov/ensdf/.
[2] M. Wang, G. Audi, A.H. Wapstra, F.G. Kondev, M. MacCormick, X. Xu, and B. Pfeiffer, Chinese Physics C, 2012, vol. 36, pp. 1603-2014.
[3] I. Angeli, K.P. Marinova, Atomic Data and Nuclear Data Tables, 2013, vol. 99, pp. 69-95; unpublished update, 2016.
[4] P. Möller, A.J. Sierk, T. Ichikawa, H. Sagawa, Atomic Data and Nuclear Data Tables, 2016, vol. 109-110, pp. 1-204.
[5] N.J. Stone, https://www-nds.iaea.org/publications/indc/indc-nds-0658/; Atomic Data and Nuclear Data Tables, 2016, vol. 111-112, pp. 1–28.
[6] H. de Vries, C.W. de Jager, C. de Vries, Atomic Data and Nuclear Data Tables, 1987, vol. 36, pp. 495-536.
[7] B. Pritychenko, M. Birch, B. Singh, M. Horoi, Atomic Data and Nuclear Data Tables, 2016, vol. 107, pp. 1–139; 2017, vol. 114, pp. 371–374.
[8] T. Kibedi and R.H. Spear, Atomic Data and Nuclear Data Tables, 2002, vol. 80, pp. 35-82.