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 (1972AJ02) and Table 18.22 [Table of Energy Levels] (in PDF or PS).

Model calculations: (1972EN03, 1974LO04).

Electromagnetic transitions: (1970SI1J, 1972EN03, 1974LO04, 1976SH04, 1977BR03, 1977SA13).

Special states: (1972EN03, 1972RA08).

Muon- and pion-induced capture and reactions (See also reaction 5.): (1972MI11, 1974LI1N, 1975LI04, 1976HEZU, 1977MA02, 1977RO1U).

Other theoretical calculations: (1970SI1J, 1972CA37, 1972RA08, 1973BE35, 1973GO1H, 1973PA1F, 1974RE03, 1974SH09, 1977SH13).

Ground state of ¹⁸Ne: (1974RE03, 1977BR03).

1. 18Ne(β+)18F

Qm = 4.447

The half-life of ¹⁸Ne is 1687 ± 9 msec (1975HA21), 1669 ± 4 msec (1975AL27): the weighted mean of these two values is 1672 ± 5 msec. For earlier measurements see Table 18.24 (in PDF or PS) in (1972AJ02) and (1970AS1C, 1972HA58). The decay is to ¹⁸F*(0, 1.04, 1.70) with J^π = 1⁺, 0⁺ and 1⁺; T = 0, 1 and 0, respectively: the branching ratios and log ft values are displayed in Table 18.20 (in PDF or PS). The mirror asymmetry δ = -0.86 ± 0.80% (1975AL27). See also (1972AJ02, 1975RA37) and (1972WI28, 1972WI1C, 1973LA03, 1973TO04, 1974WI1L, 1974WI02, 1975HA45, 1975WI1E, 1976LO01, 1977AZ02, 1977KU1E, 1977SZ03, 1977TO11; theor.).

2. 16O(3He, n)18Ne

Qm = -3.196

Excitation energies of ¹⁸Ne states derived from neutron spectra and γ-ray measurements are displayed in Table 18.23 (in PDF or PS). Table 18.27 (in PDF or PS) in (1972AJ02) summarizes the earlier angular distribution studies for E(³He) to 17.8 MeV. Recent measurements include those by (1977EV01: E(³He) = 15 and 18 MeV; see Table 18.24 (in PDF or PS)) and (1975PE11: 18.3 MeV; n₀, n₁). Branching ratios and lifetimes of the first four excited states of ¹⁸Ne are shown in Table 18.24 (in PDF or PS). Comparison of the τ_m of ¹⁸Ne*(1.89), which leads to B(E2) = 52 ± 5 e² · fm⁴, with that of ¹⁸O*(1.98), its analog, suggests the presence of two-body contributions to the E2 transition strength (1976MC02). See also (1974GO23) and (1972AJ02).

3. 16O(10B, 8Li)18Ne

Qm = -18.951

At E(¹⁰B) = 100 MeV the first (d_5/2)²_4⁺ state is preferentially excited (1977HA2E; prelim.). See also (1976TOZV).

4. 16O(12C, 10Be)18Ne

Qm = -22.664

See (1971SC1F, 1972SC21).

5. 18O(π+, π-)18Ne

Qm = -6.101

At E_π⁺ = 139 MeV the transition to ¹⁸Ne(0) has been observed with dσ/dΩ(0°) = 1.78 ± 0.30 μb/sr (1977MA02).

6. 20Ne(p, t)18Ne

Qm = -20.023

Transitions have been reported to fifteen states of ¹⁸Ne with E_x < 10 MeV: these are displayed in Table 18.23 (in PDF or PS) as are J^π derived from DWBA analysis of angular distributions (1972PA02, 1974NE04). The 0⁺₃ state, identified at E_x = 4.59 MeV appears to have a largely s²_1/2 configuration based on its large downward shift with respect to the analog state in ¹⁸O (1974NE04). See also (1972AJ02) and (1975OL03; theor.).