Nucleus[1] Binding energy (MeV) g.s. Radius[3] & Deformation[4]
42He2   Helium
J(π)=0+
T1/2=stable
Abundance: 99.9999% 3
  Experiment
[2]		 Theory
[4]		 Sh.corr.
[4]
Mass Excess 2.42491561
(0.00000006)		    
BE 28.296  
BE/A 7.074  
<R2ch>1/2 = 1.6755 ± 0.0028 fm [3]
Charge-density Distribution [6]

β2=
β3=
β4=
β6=
Excited States[1]
click on a plot to process it 		Known and possible Decays[1] Q-values (keV)
roman [2], italic [4]
α - decay 
β- - decay-22898.24
β+ - decay-23218.24
e-capture-22196.24
1p - decay-19813.89
2p - decay 
1n - decay-20577.60
2n - decay 
2β- - decay 
β-,n-34313.35
β-,2n 
β-,d 
β-,t 
β-,α 
β-,n,α 
EC,p 
EC,2p 
EC,α 
Metastable states and Resonances[1] Radiation energies (keV)[1] Thermal neutrons[1] El.-Magn. properties[5,7,8]
 
E = 20210 keV
T1/2 = 0.500 MeV
p
100%
E = 21010 keV
T1/2 = 0.840 MeV
p
76%		n
24%
E = 21840 keV
T1/2 = 2.010 MeV
p
63%		n
37%
E = 23330 keV
T1/2 = 5.010 MeV
p
53%		n
47%
E = 23640 keV
T1/2 = 6.200 MeV
p
55%		n
45%
E = 24250 keV
T1/2 = 6.100 MeV
p
50%		n
47%
3%
E = 25280 keV
T1/2 = 7.970 MeV
p
52%		n
48%
E = 25950 keV
T1/2 = 12.660 MeV
p
52%		n
48%
E = 27420 keV
T1/2 = 8.690 MeV
p
3%		n
3%
94%
E = 28310 keV
T1/2 = 9.890 MeV
p
48%		n
47%
5%
E = 28370 keV
T1/2 = 3.920 MeV
p
2%		n
2%
96%
E = 28390 keV
T1/2 = 8.750 MeV
p
0.2%		n
0.2%
99.6%
E = 28640 keV
T1/2 = 4.890 MeV

100%
E = 28670 keV
T1/2 = 3.780 MeV

100%
E = 29890 keV
T1/2 = 9.720 MeV
p
0.4%		n
0.4%
99.2%
  
σ (b)
Scattering 0.76
 		   
[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[3] I. Angeli, K.P. Marinova, Atomic Data and Nuclear Data Tables, 2013, vol. 99, pp. 69-95; unpublished update, 2016.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.