Nucleus[1] Binding energy (MeV) g.s. Radius[3] & Deformation[4]
23993Np146   Neptunium
J(π)=5/2+
T1/2=2.36 d
  Experiment
[2]		 Theory
[4]		 Sh.corr.
[4]
Mass Excess 49.312586
(0.002047)		 49.450 -1.790
BE 1806.974 1806.837
BE/A 7.561 7.560
<R2ch>1/2 = 
Charge-density Distribution [6]

β2= 0.236
β3= 0.000
β4= 0.098
β6= -0.021
Excited States[1]
click on a plot to process it 		Known and possible Decays[1] Q-values (keV)
roman [2], italic [4]
α - decay4598.79
β- - decay722.55
β+ - decay-2283.49
e-capture-1261.49
1p - decay-5285.53
2p - decay-12793.03
1n - decay-6215.18
2n - decay-11703.48
2β- - decay-79.53
β-,n-4923.62
β-,2n-11923.45
β-,d-8696.54
β-,t-9016.62
β-,α5967.07
β-,n,α669.59
EC,p-8870.49
EC,2p-15220.54
EC,α2869.90
Metastable states and Resonances[1] Radiation energies (keV)[1] Thermal neutrons[1] El.-Magn. properties[5,7,8]
 
β- endpoint energies
γ-energies
σ (b)
Capture 68.00
 
μ (nm) Q (b) E* (keV)
+2.0(3)75
  
[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[3] I. Angeli, K.P. Marinova, Atomic Data and Nuclear Data Tables, 2013, vol. 99, pp. 69-95; unpublished update, 2016.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.