Nucleus[1] Binding energy (MeV) g.s. Radius[3] & Deformation[4]
23693Np143   Neptunium
J(π)=(6-)
T1/2=1.53e+5 y
  Experiment
[2]		 Theory
[4]		 Sh.corr.
[4]
Mass Excess 43.379438
(0.050435)		 43.770 -1.810
BE 1788.693 1788.303
BE/A 7.579 7.578
<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 - decay5006.57
β- - decay476.62
β+ - decay-89.11
e-capture932.89
1p - decay-4830.22
2p - decay-11538.92
1n - decay-5736.74
2n - decay-12719.84
2β- - decay-2662.49
β-,n-6875.66
β-,2n-13113.01
β-,d-9712.90
β-,t-9520.31
β-,α6343.70
β-,n,α-924.24
EC,p-6198.49
EC,2p-11813.05
EC,α5505.79
Metastable states and Resonances[1] Radiation energies (keV)[1] Thermal neutrons[1] El.-Magn. properties[5,7,8]
 
E = 0+x keV
T1/2 = 22.50 h
β-
50%		EC
50%
β- endpoint energies
γ-energies
σ (b)
Fission 2500.00
νn= 3.12
 		   
[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[3] I. Angeli, K.P. Marinova, Atomic Data and Nuclear Data Tables, 2013, vol. 99, pp. 69-95; unpublished update, 2016.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.