Dynamic effects in fragmentation reactions.
Fragmentation reactions offer a useful tool to study the spectroscopy of halo nuclei, but the large extent of the halo wave function makes the reaction theory more difficult. The simple reaction models based on the eikonal approximation for the nuclear interaction or first-order perturbation theory for the Coulomb interaction have systematic errors that they investigate here, comparing to the predictions of complete dynamical calculations. They find that stripping probabilities are underpredicted by the eikonal model, leading to extracted spectroscopy strengths that are two large. In contrast, the Coulomb excitation is overpredicted by the simple theory. They attribute this to a screening effect, as is well known in the Barkas effect on stopping powers. The errors decrease with beam energy as E{sub beam}{sup -1}, and are not significant at beam energies above 50 MeV/u. At lower beam energies, the effects should be taken into account when extracting quantitative spectroscopic strengths.
- Research Organization:
- Argonne National Lab., IL (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 797880
- Report Number(s):
- ANL/PHY/CP-107208; TRN: US200215%%470
- Resource Relation:
- Journal Volume: 146; Conference: Yukawa International Seminar 2001 (YKIS01) : Physics of Unstable Nuclei, Kyoto (JP), 11/05/2001--11/10/2001; Other Information: PBD: 26 Mar 2002
- Country of Publication:
- United States
- Language:
- English
Similar Records
Future Gamma-Detector Arrays for Radioactive Beam Applications
Neutron-unbound states in 31Ne