Distorted wave analysis of theO17(t, p)O

Abstract

The angular distributions of '~O(t, p) 0 transitions to 13 states in '~O have been analyzed by distorted wave techniques. Two-particIe transfer amplitudes from recent (s d) shell-modeI. calculations have been utilized to aid in the interpretation of the structure of~~O .The theoretical calculations reproduce the L admixtures in the angular distributions remarkably well for many of the Iow-Iying states, Ratios of measured-to-predicted cross sections are consistent to within a factor of 3. The correspondence between the experimentally known states of~~O and those predicted by the shell-model caIculations is discussed; most of the states with known J are well accounted for. NUCLEAR REACTIONS 'O(t, p): E =12.0 MeV, DWBA analysis of old data using shell-model wave functions.

β-delayed neutron decay ofN19andN20

“…The spins and parities for experimental levels were deduced based on log(ft) values and β decay selection rules with consideration of β decay systematics in this region. The spins and parities for the energy levels of 0, 96, and 1472 keV were previously found to be 5/2 + , 3/2 + , and 1/2 + , respectively [12,22,23]. The observed log(ft) values indicate that β decay to these levels can be categorized as first forbidden decay confirming the assignments.…”

“…The excited states of 19 O have been studied using 13 C( 7 Li, p) 19 reactions [12,22,23]. Most of the states with energies lower than 6000 keV are known with an uncertainty of 0.5% from the previous studies.…”

Shell model and band structures in 19O

“…The ground state definitely has the sim- [46], as well as the first four excited states (up to the 7/2 + state at E x =2.779 MeV). Shell model counter-partners were clearly identified [48] for the ground state and the states at E x =0 .10, 1.47, 2.37, 2.78, 3.07 and 5.46 MeV, while the strong but less definite correspondence exists for the states at E x =3. 16, 4.11, 4.71, 5.00, 5.15 and 5.50 MeV.…”

“…Detailed spectroscopic information of the 19 O nucleus is given in ref. [48]. The ground state definitely has the sim- [46], as well as the first four excited states (up to the 7/2 + state at E x =2.779 MeV).…”

“…Although the expected simplicity of the structure of 19 O makes it an appealing nucleus to investigate, it is rather difficult to study this nucleus experimentally. Spectroscopy of 19 O has been made mainly by [46][47][48], and 13 C( 7 Li,p) [49][50][51] reactions. Angular correlations for the 18 O(d, p) reaction are consistent with J π =5 /2 + for the ground state and unambiguously fix J π =3 /2 + and 1/2 + , respectively, for the 19 O * (0.096, 1.47 MeV).…”