ADOPTED LEVELS, GAMMAS for 12Be
Authors: J.H. Kelley, J.E. Purcell and C.G. Sheu | Citation: Nucl. Physics A968, 71 (2017) | Cutoff date: 1-Jan-2017
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=11708.4 keV 23 | S(n)= 3170.7 keV 19 | S(p)= 22939.5 keV 20 | Q(α)= -8956.8 keV 19 | ||
Reference: 2017WA10 |
References: | |||
A | 1H(12Be,12Be),(12Be,12Be’) | B | 2H(11Be,pγ) |
C | 4He(8He,12Be) | D | 4He(12Be,12Be’γ) |
E | 7Li(12B,7Be) | F | 9Be(12C,9C) |
G | 9Be(13B,12Be) | H | 9Be(15N,12N) |
I | 9Be(18O,12BeG) | J | 10Be(t,p) |
K | 10Be(14N,12N) | L | 12C(π-,π+) |
M | 12C(12Be,12Be’) | N | 12C(14Be,12Be) |
O | 12C(14C,14O),14C(12C,14O) | P | 14C(14C,16O) |
Q | TA(p,X) | R | TA(12Be,12Be’γ) |
S | 197Au(12Be,G12BE) | T | 208Pb(12Be,G12BE) |
U | 238U(p,12Be) |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
0 | AB DEF IJKLM OPQRSTU | 0+ | 21.46 ms 5 % β- = 100 % β-n = 0.50 3 | |||||
2109 1 | AB D F IJKL OP RST | 2+ | 0.957 ps 19 % IT = 100 | 2109 1 | 100 | E2 | 0 | 0+ |
2251 1 | B E IJ O | 0+ | 230 ns 8 % IT = 100 | 142 2 2251 | 17.7 | E2 E0 | 2109 0 | 2+ 0+ |
2715 15 | AB D J L OP RST | 1- | 1.3 fs 4 % IT = 100 | 2715 2 | 100 | E1 | 0 | 0+ |
4412 16 ? | G | (2-) | 634 keV 60 % n > 0 | |||||
4580 5 | A F JK OP | (2+,3-) | 101 keV 17 | |||||
5724 6 | A F H JK OP | (4+,2+,3-) | 85 keV 15 | |||||
6275 50 | F H K | |||||||
7.2E3 1 | F H O | (2+) | ||||||
8230? | F | |||||||
8.60E3 15 | A F | < 500 keV | ||||||
9300 | H O | 2.0 MeV 3 | ||||||
10.0E3 | A D F M | 1.5 MeV 2 | ||||||
10.8E3 | D F H | 0+ | ||||||
11.3E3 | D F K | 2+ | ||||||
11.8E3 | D MN | (0,2+) | ≈ 1 MeV | |||||
12.1E3 | F M | (2+,4) | ||||||
13.2E3 5 | A C MN | (4+) | ≈ 1 MeV | |||||
14.0E3 | A C M | |||||||
14.9E3 5 | A C F H MN | 6+ | ||||||
15.5E3 | A C MN | ≈ 1.5 MeV | ||||||
16.1E3 5 | A F | 6 | ||||||
17.8E3 5 | A M | 6 | ≈ 350 keV | |||||
18.6E3 5 | A M | 6 | ||||||
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
19.3E3 5 | A H M O | 6 | ||||||
20.9E3 5 | H M | 8+ | ||||||
22.8E3 | A | |||||||
24E3? | A | |||||||
25E3 | A | ≈ 370 keV % p > 0 | ||||||
28E3 | A | ≈ 2.7 MeV % p > 0 |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Additional Data |
2109 | 2+ | 0.957 ps 19 % IT = 100 | 2109 1 | E2 | B(E2)=14.2E-4 28, B(E2)(W.u.)=8.5 17 |
2251 | 0+ | 230 ns 8 % IT = 100 | 142 2 | E2 | B(E2)(W.u.)=4.21 44 |
2715 | 1- | 1.3 fs 4 % IT = 100 | 2715 2 | E1 | B(E1)(W.u.)=4.9E-3 13 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0 | 0+ | 21.46 ms 5 % β- = 100 % β-n = 0.50 3 | T=2 T1/2: From weighted average of T1/2=21.49 ms 3 (2001Be53,2002Be53), 26.1 ms 24 (1994Ke06), 21.32 ms 6 (Reeder et al., Int. Conf. on Nucl. Data for Science and Technology, May 9-13, 1994, Gatlinburg, Tennessee: see also (1991Re02)), 21.3 ms 22 (1986Cu01), 24.0 ms 10 (1984Du15), and 24.4 ms 30 (1978Al10). E(level): T1/2: From weighted average of T1/2=21.49 ms 3 (2001Be53,2002Be53), 26.1 ms 24 (1994Ke06), 21.32 ms 6 (Reeder et al., Int. Conf. on Nucl. Data for Science and Technology, May 9-13, 1994, Gatlinburg, Tennessee: see also (1991Re02)), 21.3 ms 22 (1986Cu01), 24.0 ms 10 (1984Du15), and 24.4 ms 30 (1978Al10). |
2109 | 2+ | 0.957 ps 19 % IT = 100 | T=2 T1/2: From |t=1.38 ps 20(stat) 19(syst) (2018Mo12); see also T1/2=1.73 ps 53 in (2009Im01). E(level): T1/2: From |t=1.38 ps 20(stat) 19(syst) (2018Mo12); see also T1/2=1.73 ps 53 in (2009Im01). |
2251 | 0+ | 230 ns 8 % IT = 100 | T1/2: From average of 247 ns 15 (2013Jo06) and 229 ns 8 (2007Sh34). |
2715 | 1- | 1.3 fs 4 % IT = 100 | T1/2: From B(E1) given in (2000Iw03). |
4580 | (2+,3-) | 101 keV 17 | E(level): Decay mode not specified. |
5724 | (4+,2+,3-) | 85 keV 15 | E(level): Decay mode not specified. |
6275 | E(level): Decay mode not specified. | ||
7.2E3 | (2+) | E(level): Decay mode not specified. | |
8230 | E(level): Decay mode not specified. | ||
8.60E3 | < 500 keV | E(level): Decay mode not specified. | |
9300 | 2.0 MeV 3 | E(level): Decay mode not specified. | |
10.0E3 | 1.5 MeV 2 | E(level): Decays via α+8He. | |
10.8E3 | 0+ | E(level): Decays via 6He+6He. | |
11.3E3 | 2+ | E(level): Decay mode not specified. | |
11.8E3 | (0,2+) | ≈ 1 MeV | E(level): Decays via 6He+6He. |
12.1E3 | (2+,4) | E(level): Decays via α+8He. | |
13.2E3 | (4+) | ≈ 1 MeV | E(level): Decays via α+8He and 6He+6He. |
14.0E3 | E(level): Decays via α+8He and 6He+6He. | ||
14.9E3 | 6+ | E(level): Decays via α+8He and 6He+6He. | |
15.5E3 | ≈ 1.5 MeV | E(level): Decays via α+8He and 6He+6He. | |
16.1E3 | 6 | E(level): Decays via α+8He. | |
17.8E3 | 6 | ≈ 350 keV | E(level): Decays via α+8He and 6He+6He. |
18.6E3 | 6 | E(level): Decays via α+8He and 6He+6He. | |
19.3E3 | 6 | E(level): Decays via α+8He and 6He+6He. | |
20.9E3 | 8+ | E(level): Decays via α+8He and 6He+6He. | |
E(level) | Jπ(level) | T1/2(level) | Comments |
22.8E3 | E(level): Decays via α+8He and 6He+6He. | ||
24E3 | E(level): Decays via α+8He and 6He+6He. |
E(level) | E(gamma) | Comments |