Breakup channels for {sup 12}C triple-{alpha} continuum states
- Department of Physics, University of York, York, YO10 5DD (United Kingdom)
- Department of Theoretical Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200 (Australia)
- Instituto Estructura de la Materia, CSIC, E-28006 Madrid (Spain)
- Kernfysisch Versneller Institut, University of Groningen, Zernikelaan 25, 9747 AA Groningen (Netherlands)
- Department of Physics, University of Jyvaeskylae, FIN-40014 Jyvaeskylae (Finland)
- Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus (Denmark)
The triple-{alpha}-particle breakup of states in the triple-{alpha} continuum of {sup 12}C has been investigated by way of coincident detection of all three {alpha} particles of the breakup. The states have been fed in the {beta} decay of {sup 12}N and {sup 12}B, and the {alpha} particles measured using a setup that covers all of the triple-{alpha} phase space. Contributions from the breakup through the {sup 8}Be(0{sup +}) ground state as well as other channels--interpreted as breakup through excited energies in {sup 8}Be--have been identified. Spins and parities of {sup 12}C triple-{alpha} continuum states are deduced from the measured phase-space distributions for breakup through {sup 8}Be above the ground state by comparison to a fully symmetrized sequential R-matrix description of the breakup. At around 10 MeV in {sup 12}C, the breakup is found to be dominated by 0{sup +} strength breaking up through the ghost of the {sup 8}Be(0{sup +}) ground state with L=0 angular momentum between the first emitted {alpha} particle and the intermediate {sup 8}Be nucleus. For {sup 12}C energies above the 12.7 MeV 1{sup +} state, however, L=2 breakup of a {sup 12}C 2{sup +} state through the {sup 8}Be(2{sup +}) excited state dominates. Furthermore, the possibility of a 2{sup +} excited state in the 9-12 MeV region of {sup 12}C is investigated.
- OSTI ID:
- 21293827
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 80, Issue 3; Other Information: DOI: 10.1103/PhysRevC.80.034316; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
Similar Records
Large-angle {alpha}-particle scattering on {sup 12}C and search for signatures of {alpha}-particle Bose condensation
Study of various discretization methods of the neutron-proton breakup continuum in deuteron nucleus collisions