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 10 | S(n)= 18898.64 keV 8 | S(p)= 17254.40 keV 4 | Q(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 |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | M(γ) | Final Levels | |
| 0.0 | ABCDE 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) | XREF | Jπ(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) | XREF | Jπ(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
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Additional Data |
| 16626 | 2+ | 108.1 keV 5 % α ≈ 100 % IT < 2.65E-3 | 13580 | M1 | B(M1)(W.u.)<5.3×10-2 3 | |
| 2+ | 108.1 keV 5 % α ≈ 100 % IT < 2.65E-3 | 16607 | E2 | B(E2)(W.u.)=7.1E-2 25 | ||
| 16922 | 2+ | 74.0 keV 4 % α ≈ 100 % IT < 3.89E-3 | 13879 | M1 | B(M1)(W.u.)<5.3×10-2 3 | |
| 2+ | 74.0 keV 4 % α ≈ 100 % IT < 3.89E-3 | 16903 | E2 | B(E2)(W.u.)=7.8E-2 13 | ||
| 17640.0 | 1+ | 10.7 keV 5 % IT = 0.204 % p = 99.8 | 718 | M1 | B(M1)(W.u.)=0.17 4 | |
| 1+ | 10.7 keV 5 % IT = 0.204 % p = 99.8 | 1014 | M1+E2 | -0.014 13 | B(M1)(W.u.)=1.5 2 | |
| 1+ | 10.7 keV 5 % IT = 0.204 % p = 99.8 | 14586 | M1+E2 | 0.21 4 | B(E2)(W.u.)=0.23 10, B(M1)(W.u.)=0.10 2 | |
| 1+ | 10.7 keV 5 % IT = 0.204 % p = 99.8 | 17619 | M1 | B(M1)(W.u.)=0.13 2 | ||
| 18150 | 1+ | 138 keV 6 % IT = 4.6E-3 % p ≈ 100 | 1228 | M1 | B(M1)(W.u.)=1.6 2 | |
| 1+ | 138 keV 6 % IT = 4.6E-3 % p ≈ 100 | 1524 | M1 | B(M1)(W.u.)=1.0 3 | ||
| 1+ | 138 keV 6 % IT = 4.6E-3 % p ≈ 100 | 15095 | M1 | B(M1)(W.u.)=5.9×10-2 17 | ||
| 1+ | 138 keV 6 % IT = 4.6E-3 % p ≈ 100 | 18128 | M1 | B(M1)(W.u.)=1.5×10-2 3 | ||
| 18910 | 2- | 122 keV % IT = 2.2E-4 % n = ? % p = ? | 1988 | E1 | B(E1)(W.u.)=4.6E-2 20 | |
| 2- | 122 keV % IT = 2.2E-4 % n = ? % p = ? | 2284 | E1 | B(E1)(W.u.)=5.3E-2 20 | ||
| 19069 | 3+ | 271 keV 15 % IT = 3.87E-3 % p ≈ 100 | 16013 | M1 | 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 | 9847.6 | M1 | B(M1)(W.u.)=1.10 20 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 19235 | 3+ | 227 keV 16 % n ≈ 50 % p ≈ 50 | T=0 Branching ratio from 7Li(p,n). |
| 19860 | 4+ | 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). |
| 20100 | 2+ | 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). |
| 20200 | 0+ | 720 keV 20 % n = ? % α ≈ 50 | T=0 Γα/Γ≈0.50 4He(α,α). |
| 22000 | 1- | ≈ 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). |
| E(level) | E(gamma) | 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 -17979.8 1018899.681217255.44 9 91.84 4 2003Au02