Information on mass chains and nuclides

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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, 1967VA31, 1968BA2H, 1968BE1V, 1968MU1B, 1968NE1C, 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 J^π = (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 J^π = 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 J^π = 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 E_p = 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.).