Information on mass chains and nuclides

3	4
5	6
7	8
9	10
11	12
13	14
15	16
17	18
19	20
Group Info
Publications
HTML
General Tables
Level Diagrams
Tables of EL's
NSR Key# Retrieval
ENSDF
Excitation Functions
Thermal N Capt.
G.S. Decays
Half-Lives Table
TUNL Dissertations
NuDat at BNL
Useful Links
Citation Examples
Home
Sitemap
Directory
Email Us

WWW TUNL

GENERAL: See also (1979AJ01) and Table 8.11 [Table of Energy Levels] (in PDF or PS).

Special states: (1980OK01).

Complex reactions involving ⁸B (The reactions ⁶Li(⁶Li, ⁴H)⁸B, ¹²C(⁶Li, ¹⁰Be)⁸B, ⁹Be(⁷Li, ⁸He)⁸B and ¹²C(⁷Li, ¹¹Be)⁸B have been studied at E(⁶Li) = 72 MeV and E(⁷Li) = 83 MeV (1982AL08): see ⁸He, ¹⁰Be, as well as ¹¹Be in (1985AJ01).): (1979BO22, 1980GR10, 1981MO20).

Astrophysical questions: (1981BA17, 1983LI01).

Reactions involving pions: ( 1981JU1A, 1981NI03, 1982HA57, 1983HU02).

Hypernuclei: (1981WA1J).

Other topics: (1979BE1H, 1982AW02, 1982NG01).

Ground state of ⁸B: (1982NG01).

1. 8B(β+)8Be

Qm = 17.979

The β⁺ decay leads mainly to ⁸Be*(2.9). The mean half-lives listed in (1974AJ01) is 770 ± 3 msec; log ft = 5.64. There is also a branch to a ⁸Be* state at ≈ 16.6 MeV; log ft = 3.3. See also (1979AJ01) and reaction 28 in ⁸Be. See also (1978RA2A), (1979DA1D, 1980HA1V, 1980PE1N, 1981BA17, 1981BA2B, 1981BA2G, 1981IT1A, 1982BA80, 1982CO1D, 1982KL1C, 1983TR1F; astrophsyics) and (1979DE15, 1980OK01, 1981BA17, 1981HO06, 1982IT01; theor.).

2. 6Li(d, π-)8B

Qm = -135.266

At E_d = 300 and 600 MeV ⁸B*(0, 0.78, 2.32) are populated: the cross sections are higher at the lower (subthreshold for pion production) energy (1982AS01). See also (1982LE1L).

3. 6Li(3He, n)8B

Qm = -1.975

Angular distributions for the n₀ group have been reported at E(³He) = 4.8 to 5.7 MeV: L = 0. Two measurements for the E_x of ⁸B*(0.78) are 767 ± 12 and 783 ± 10 keV [Γ = 40 ± 10 keV]: see (1974AJ01) and ⁹B.

4. 7Be(p, γ)8B

Qm = 0.138

Absolute cross sections have been measured for E_p = 0.165 to 10.0 MeV. A resonance at E_p = 724 keV [⁸B*(0.771)] with Γ_lab ≈ 46 keV [σ_peak = 2.20 ± 0.22 μb, Γ_γ = 50 ± 25 meV] is reported. The zero-energy cross-section factor S₁₇(0) = 0.0216 ± 0.0025 keV · b (1983FI01), appreciably lower than earlier results: see (1979AJ01). Calulations by (1980BA35) had suggested that S(0) was in the range 0.014 to 0.022 keV · b. The astrophysical implications of this reaction are discussed by (1975ZI1A, 1980BA1P, 1980BA35, 1980BA2M, 1981BA2F, 1982BA80, 1983FI01). The predicted ³⁷Cl ν-capture rate is decreased to 5.3 SNU, a reduction of about 25% in the previous value (1983FI01). See also (1980PE1N; astrophys.) and (1981WI04; theor.).

5. 7Be(d, n)8B

Qm = -2.087

See (1983HA1W).

6. 10B(π+, d)8B

Qm = 115.561

See (1982DO01).

7. 10B(p, t)8B

Qm = -18.531

At E_p = 49.5 MeV angular distributions have been measured for the tritons to ⁸B*(0, 2.32): L = 2 and L = 0 + 2 leading to J^π = 2⁺ and 3⁺, respectively. Measurements of E_x for ⁸B*(2.32) yield 2.29 ± 0.05 MeV, 2.34 ± 0.04 MeV [Γ_lab = 0.39 ± 0.04 MeV]. ⁸B*(0.78) is also observed: see (1974AJ01).

8. 11B(3He, 6He)8B

Qm = -16.914

At E(³He) = 72 MeV the first T = 2 state is observed at E_x = 10.619 ± 0.009 MeV, Γ < 60 keV: dσ/dΩ(lab) = 190 nb/sr at θ_lab = 9°. No other states are observed within 2.4 MeV of this state. ⁸B*(0, 0.78, 2.32) have also been populated: see (1979AJ01).

9. 12C(3He, 7Li)8B

Qm = -22.896

See (1979AJ01).

10. 14C(7Li, 13Be)8B

Qm = -40.0

See (1983ALZM).