
^{15}C (1976AJ04)(See Energy Level Diagrams for ^{15}C) GENERAL: See also (1970AJ04) and Table 15.1 [Table of Energy Levels] (in PDF or PS) here. Model calculations: (1973PH03, 1973RE17). Special levels: (1973PH03, 1974VA24). Muon and neutrino capture and reactions: (1973BE16, 1973BU20). Pion capture and reactions: (1970JA11). Special reactions: (1971AR02, 1973KO1D, 1973WI15, 1974KO25, 1975UD01). Other topics: (1970SU1B, 1973PH03, 1973RE17, 1974VA24, 1975BE31).
The halflife is 2.449 ± 0.004 sec (D.E. Alburger, private communication). See also (1970AL21). Transitions have been observed to the ^{15}N_{g.s.} and to the upper of the 5.3 MeV levels of ^{15}N. The latter transition (which is to a 1/2^{+} state) is clearly allowed: see Table 15.2 (in PDF or PS). Therefore J^{π}(^{15}C_{g.s.}) = 1/2^{+} or 3/2^{+} (1959AL06, 1959AL97, 1966AL12, 1969GA05). Weak transitions are observed to ^{15}N*(7.30, 8.31, 8.57, 9.05). See also (1970AS1C) and (1970HS02, 1972TO03; theor.).
See (1970AJ04).
Observed proton groups and a γray measurement are displayed in Table 15.3 (in PDF or PS) (1974GA33, 1975HA42). τ_{m} for ^{15}C*(0.74) = 3.77 ± 0.11 nsec (1968ME08). Angular distributions have been reported at E(^{7}Li) = 1.7 to 1.9 MeV (1969KA1C; p_{1} → p_{4}), 5.66.2 MeV (1969SN02; p_{0}, p_{1}) and 20 MeV (1974GA33; to states with E_{x} < 8.6 MeV, and partial distributions to ^{15}C*(9.79, 10.25, 11.13, 11.83). See also (1970AJ04).
σ_{γ} < 1 μb (1951YA1A, 1973MU14).
See (1973PH03, 1974PH03; theor.).
Observed proton groups are displayed in Table 15.3 (in PDF or PS) (1973GO28, 1975GO31) and compared with the results of reaction 3. The spectroscopic factors obtained for the bound states ^{15}C*(g.s., 0.74) [J^{π} = 1/2^{+} and 5/2^{+}, respectively] are somewhat less than the value 1 predicted theoretically (1973PH03, 1973RE17) [see, however, (1975CE04)]. τ_{m} of ^{15}C*(0.74) = 3.73 ± 0.23 nsec (1962LO02): the angular distribution of the 0.74 MeV γrays requires J ≥ 5/2; l_{n} = 2 stripping permits J^{π} = 3/2^{+} or 5/2^{+}. Therefore J^{π} = 5/2^{+} for ^{15}C*(0.74) (1962CH14); g = 0.77 ± 0.06 (1975HA42). See (1970AJ04) for a review of the earlier work.
See ^{16}N in (1977AJ02).
See (1966BA1F). The following lightparticle induced reactions leading to ^{15}C have not been reported:
