Nucleus[1] Binding energy (MeV) g.s. Radius[3] & Deformation[4]
23493Np141   Neptunium
J(π)=(0+)
T1/2=4.40 d
  Experiment
[2]		 Theory
[4]		 Sh.corr.
[4]
Mass Excess 39.956674
(0.008511)		 40.380 -1.570
BE 1775.974 1775.550
BE/A 7.590 7.588
<R2ch>1/2 = 
Charge-density Distribution [6]

β2= 0.216
β3= 0.000
β4= 0.119
β6= 0.004
Excited States[1]
click on a plot to process it 		Known and possible Decays[1] Q-values (keV)
roman [2], italic [4]
α - decay5357.00
β- - decay-393.18
β+ - decay787.81
e-capture1809.81
1p - decay-4252.58
2p - decay-10569.30
1n - decay-6064.61
2n - decay-13546.93
2β- - decay-4504.26
β-,n-8166.71
β-,2n-14549.08
β-,d-10539.99
β-,t-10618.42
β-,α5916.81
β-,n,α-1750.39
EC,p-4822.41
EC,2p-10070.07
EC,α6667.50
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)
Fission 900.00
 		   
[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[3] I. Angeli, K.P. Marinova, Atomic Data and Nuclear Data Tables, 2013, vol. 99, pp. 69-95; unpublished update, 2016.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.