ADOPTED LEVELS, GAMMAS for 8Be

Authors: D.R. Tilley, J.H. Kelley, J.L. Godwin, D.J Millener Et Al. |  Citation: Nucl. Physics A745, 155 (2004) |  Cutoff date: 31-Mar-2004 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-17979.9 keV 10S(n)= 18898.64 keV 8S(p)= 17254.40 keV 4Q(α)= 91.84 keV 4
Reference: 2012WA38

References:
  A  8Li β- decay  B  8B β+ decay
  C  4He(α,γ)  D  4He(α,α)
  E  6Li(d,γ)  F  6Li(d,n), 6Li(d,p)
  G  6Li(d,α), 6Li(d,pα)  H  6Li(t,n)
  I  6Li(3He,p)  J  6Li(α,d), 6Li(α,2α)
  K  6Li(6Li,α)  L  7Li(p,γ)
  M  7Li(p,n)  N  7Li(p,p), 7Li(p,p’)
  O  7Li(p,α)  P  7Li(d,n)
  Q  7Li(3He,d), 7Li(3He,DA)  R  7Li(α,t)
  S  7Li(7Li,6He)  T  7Be(n,p)
  U  9Be(p,d), 9Be(p,NP)  V  9Be(d,t)
  W  9Be(3He,α)  X  10Be(p,t)
  Y  10B(p,3He)  Z  10B(d,α)
  a  11B(3He,6Li)  b  12C(d,6Li)
  c  12C(3He,7Be)  d  12C(α,2α), 12C(α,8Be)
  e  αγ(14N,8Be)  f  9C β+p decay

General Comments:

See also table 8.10: electromagnetic transitions in 8Be (2004Ti06) and reaction: 4He(α,α).

Q-value: Note: Current evaluation has used the following Q record









E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
M(γ)Final Levels
      0.0ABCDE  HIJKL   PQRS UVW YZabcdef 0+ 5.57 eV 25 
% α = 100
    
   3030 10 ABCDE  HIJKL   PQRS UVW YZabcd f 2+ 1513 keV 15 
% α ≈ 100
   3029
E2
      0.0
0+
     11.35E+3 15   CD     JK    P R  UVW  Z bcd   4+ ≈ 3.5 MeV
% α ≈ 100
  11350
E4
      0.0
0+
  16626 3  BCD   HI KL   PQR  UVW YZabc    2+ 108.1 keV 5 
% α ≈ 100
% IT < 2.65×10-3
  13580
  16607
M1
E2
   3030
      0.0
2+
0+
  16922 3   CD   HI KL   PQR  UVW YZabc    2+ 74.0 keV 4 
% α ≈ 100
% IT < 3.89×10-3
  13879
  16903
M1
E2
   3030
      0.0
2+
0+
  17640.0 10     E   I  L N PQ   UVW  Za c    1+ 10.7 keV 5 
% IT = 0.204
% p = 99.8
    718
   1014
  14586
  17619
M1
M1+E2
M1+E2
M1
  16922
  16626
   3030
      0.0
2+
2+
2+
0+
  18150 4         I  L N PQ   UV   Za      1+ 138 keV 6 
% IT = 4.6×10-3
% p ≈ 100
   1228
   1524
  15095
  18128
M1
M1
M1
M1
  16922
  16626
   3030
      0.0
2+
2+
2+
0+
  18910        I  LMN P   T             2- 122 keV
% IT = 2.2×10-4
% n = ?
% p = ?
   1988
   2284
E1
E1
  16922
  16626
2+
2+
  19069 10         I  L N P    UV           3+ 271 keV 15 
% IT = 3.87×10-3
% p ≈ 100
  16013
M1
   3030
2+
  19235 10             MN P   TUVW  Z    e  3+ 227 keV 16 
% n ≈ 50
% p ≈ 50
    
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
M(γ)Final Levels
  19400        I   MN      U            1- ≈ 645 keV
% n = ?
% p = ?
    
  19860 50    D    I K   O  RS  VW  Z       4+ 0.7 MeV 1 
% p = 30
% α = 70
    
  20100   D        MNOP  S  V   Z       2+ 880 keV 20 
% n = ?
% p = ?
% α = ?
    
  20200   D        M  P         Z       0+ 720 keV 20 
% n = ?
% α ≈ 50
    
     20.9E+3             N                   4- 1.6 MeV 2 
% p = ?
    
     21.5E+3           LM      T     Z       3(+) 1.1 MeV
% IT = ?
% n = ?
% p = ?
    
  22000           L                     1- ≈ 4 MeV
% IT = ?
% p = ?
    
     22.05E+3 10                     U W          270 keV 70      
     22.24E3 2    D  G     MNO          Z       2+ ≈ 0.8 MeV
% n = ?
% p = ?
% D = ?
% α = ?
    
     22.63E+3 10           K           W          100 keV 50      
     22.98E+3 10                       W          230 keV 50      
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
M(γ)Final Levels
  24000           L  O          Z       (1,2)- ≈ 7 MeV
% IT = ?
% p = ?
% α = ?
    
  25200   D  G       O          Z       2+ % p = ?
% D = ?
% α = ?
    
  25500   D  G                          4+ % D = ?
% α = ?
    
  27494.1 18     EFG                X         0+ 5.5 keV 20 
% IT = 0.60
% n = 39.4
% p = 6.9
% D = 27.0
% 3H = 11.7
% 3HE = 6.6
% α = 7.9
   9847.6
M1
  17640.0
1+
  28600?           L                     % IT = ?
% p = ?
    
     32E3?                         Z       1 MeV     
    ≈41E3?      G                                

E(γ): From E(level) difference; recoil correction applied

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Additional Gamma Data:













E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityMixing
Ratio
Additional Data
  16626 2+ 108.1 keV 5 
% α ≈ 100
% IT < 2.65E-3
  13580M1 B(M1)(W.u.)<5.3×10-2 3
2+ 108.1 keV 5 
% α ≈ 100
% IT < 2.65E-3
  16607E2 B(E2)(W.u.)=7.1E-2 25
  16922 2+ 74.0 keV 4 
% α ≈ 100
% IT < 3.89E-3
  13879M1 B(M1)(W.u.)<5.3×10-2 3
2+ 74.0 keV 4 
% α ≈ 100
% IT < 3.89E-3
  16903E2 B(E2)(W.u.)=7.8E-2 13
  17640.0 1+ 10.7 keV 5 
% IT = 0.204
% p = 99.8
    718M1 B(M1)(W.u.)=0.17 4
1+ 10.7 keV 5 
% IT = 0.204
% p = 99.8
   1014M1+E2-0.014 13B(M1)(W.u.)=1.5 2
1+ 10.7 keV 5 
% IT = 0.204
% p = 99.8
  14586M1+E20.21 4B(E2)(W.u.)=0.23 10, B(M1)(W.u.)=0.10 2
1+ 10.7 keV 5 
% IT = 0.204
% p = 99.8
  17619M1 B(M1)(W.u.)=0.13 2
  18150 1+ 138 keV 6 
% IT = 4.6E-3
% p ≈ 100
   1228M1 B(M1)(W.u.)=1.6 2
1+ 138 keV 6 
% IT = 4.6E-3
% p ≈ 100
   1524M1 B(M1)(W.u.)=1.0 3
1+ 138 keV 6 
% IT = 4.6E-3
% p ≈ 100
  15095M1 B(M1)(W.u.)=5.9×10-2 17
1+ 138 keV 6 
% IT = 4.6E-3
% p ≈ 100
  18128M1 B(M1)(W.u.)=1.5×10-2 3
  18910 2- 122 keV
% IT = 2.2E-4
% n = ?
% p = ?
   1988E1 B(E1)(W.u.)=4.6E-2 20
2- 122 keV
% IT = 2.2E-4
% n = ?
% p = ?
   2284E1 B(E1)(W.u.)=5.3E-2 20
  19069 3+ 271 keV 15 
% IT = 3.87E-3
% p ≈ 100
  16013M1 B(M1)(W.u.)=0.122
  27494.1 0+ 5.5 keV 20 
% IT = 0.60
% n = 39.4
% p = 6.9
% D = 27.0
% 3H = 11.7
% 3HE = 6.6
% α = 7.9
   9847.6M1 B(M1)(W.u.)=1.10 20

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
  192353+ 227 keV 16 
% n ≈ 50
% p ≈ 50
T=0
Branching ratio from 7Li(p,n).
  198604+ 0.7 MeV 1 
% p = 30
% α = 70
T=0
Γα/Γp=2.3 5 10B(d,2α), 10B(d,p+7Li)(1992Pu06). Other measurement Γα/Γ=0.96 from 4He(α,α).
E(level): Γα/Γp=2.3 5 10B(d,2α), 10B(d,p+7Li)(1992Pu06). Other measurement Γα/Γ=0.96 from 4He(α,α).
  201002+ 880 keV 20 
% n = ?
% p = ?
% α = ?
T=0
Γα/Γp=4.5 6 10B(d,α),10B(d,p)(1992Pu06).
E(level): Γα/Γp=4.5 6 10B(d,α),10B(d,p)(1992Pu06).
  202000+ 720 keV 20 
% n = ?
% α ≈ 50
T=0
Γα/Γ≈0.50 4He(α,α).
  220001- ≈ 4 MeV
% IT = ?
% p = ?
T=1
E(level): Giant resonance: see reaction 7Li(p,γ).
  24000(1,2)- ≈ 7 MeV
% IT = ?
% p = ?
% α = ?
T=1
E(level): Giant resonance: see reaction 7Li(p,γ).

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Additional Gamma Comments:

E(level)E(gamma)Comments

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