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USNDP

18Ne (1972AJ02)


(See Energy Level Diagrams for 18Ne)

GENERAL: See Table 18.23 [Table of Energy Levels] (in PDF or PS).

Shell and cluster model calculations: (1957WI1E, 1969BE1T, 1970BA2E, 1970EL08, 1970HA49, 1972KA01).

Electromagnetic transitions: (1970EL08, 1970HA49).

Special levels: (1966MI1G, 1969KA29, 1972KA01).

Pion reactions: (1965PA1F).

Other theoretical calculations: (1965GO1F, 1966KE16, 1968BA2H, 1968BE1V, 1968MU1B, 1968NE1C, 1968VA1J, 1968VA24, 1969BA1Z, 1969GA1G, 1969KA29, 1969MU09, 1969RA28, 1969SO08, 1970BA1Z, 1970DI1G, 1970EL08, 1972KA01).

1. 18Ne(β+)18F Qm = 4.447

The half-life of 18Ne is 1.67 ± 0.02 sec: see Table 18.24 (in PDF or PS) (1970AL11, 1970AS06). The decay is to 18F*(0, 1.04, 1.70) with Jπ = (1+); T = (0), (0+; 1), (1+; 0), respectively: the branching ratios and log ft values are displayed in Table 18.21 (in PDF or PS). The ratio of the ft values for the 18Ne → 18F(0) and 18F → 18O transitions is 0.992 ± 0.015 (1970AL11): see also (1969KA1B, 1970AS06). See also (1966ZA03, 1968BO1U, 1968FR03, 1970MC23, 1971BL12, 1971DE1E).

2. 16O(3He, n)18Ne Qm = -3.196
Q0 = -3.206 ± 0.013 (1961DU02);
Q0 = -3.199 ± 0.006 (1961TO03).

Excitation energies of 18Ne states derived from neutron spectra and γ-ray measurements are displayed in Table 18.25 (in PDF or PS) (1961TO03, 1968GI09, 1969RO08, 1970AD02, 1970NE1J, 1970NE1N, 1970SH04). Branching ratios and lifetimes of the first four excited states of 18Ne are shown in Table 18.26 (in PDF or PS) (1968GI09, 1969RO08, 1969RO22, 1970SH04, 1971RO18, 1972GI01). Table 18.27 (in PDF or PS) summarizes the neutron angular distribution studies. Angular correlation studies, together with PWBA and DWBA double stripping analysis of neutron angular distributions, and the branching ratio and lifetime measurements, lead to assignments of Jπ = 0+, 2+, 4+, 0+ and 2+ for 18Ne*(0, 1.89, 3.38, 3.58, 3.62), respectively (1968GI09, 1968TO09, 1969RO08, 1969RO22, 1970AD02, 1970SH04, 1971RO18, 1972GI01). It is also suggested that 18Ne*(4.58) has Jπ = 0+ and a predominantly two-particle structure (1970NE1J). See also (1961BU05, 1961EC02, 1963FR10, 1964BR13, 1964FR1B, 1965BR1H, 1965FR09, 1968GO05, 1970AL11, 1970AS06), (1969BA1Z) and (1964HE06; theor.).

3. 20Ne(p, t)18Ne Qm = -20.022

Transitions have been reported to nine states of 18Ne at Ep = 42.6 to 50 MeV. L values derived from DWBA analysis of angular distributions are displayed in Table 18.28 (in PDF or PS) (1969HA38, 1970FA17, 1970LE08, 1971PA1L). See also (1968PA1R, 1970OL1B) and (1969SO08; theor.).