High-spin precursors of the J<sup>pi </sup>=<sup>19-</sup>/<sub>2</sub> isomer in <sup>43</sup>Sc
H M Sheppard; P A Butler; R Daniel; P J Nolan; N R F Rammo; J F Sharpey-Schafer; H M Sheppard; Oliver Lodge Lab., Univ. of Liverpool, Liverpool, UK; P A Butler; Oliver Lodge Lab., Univ. of Liverpool, Liverpool, UK; R Daniel; Oliver Lodge Lab., Univ. of Liverpool, Liverpool, UK; P J Nolan; Oliver Lodge Lab., Univ. of Liverpool, Liverpool, UK; N R F Rammo; Oliver Lodge Lab., Univ. of Liverpool, Liverpool, UK; J F Sharpey-Schafer; Oliver Lodge Lab., Univ. of Liverpool, Liverpool, UK
Журнал:
Journal of Physics G: Nuclear Physics
Дата:
1980-04-01
Аннотация:
Three high-spin precursors of the <sup>19-</sup>/<sub>2</sub> isomeric level at 3.12 MeV in <sup>43</sup>Sc have been studied using the <sup>29</sup>Si(<sup>16</sup>O,pn)<sup>43</sup>Sc reaction at beam energies of 40 and 42 MeV. The decay scheme was established with the aid of gamma - gamma coincidence experiments. These previously unreported levels have excitation energies of 5517, 6429 and 7355 keV with probable spins and parities of <sup>19+</sup>/<sub>2</sub>, <sup>23+</sup>/<sub>2</sub> and <sup>25+</sup>/<sub>2</sub> respectively. The mean lifetimes of these levels have been found to be <90 fs for the 5517 keV level, 23.5+or-2.2 ps for the 6429 keV level and 600+or-160 fs for the 7355 keV level. Definite spin and parity assignments of <sup>11-</sup>/<sub>2</sub> and <sup>15-</sup>/<sub>2</sub> have also been made for the 1830 keV and 2987 keV levels respectively. The data are compared with the results of a simple shell-model calculation.
612.2Кб