Structure ofC14via elastic and inelastic neutron scattering fromC

Abstract

Differential cross sections for neutrons elastically scattered from ' C and inelastically scattered to the first three excited states ' C*(3.09, 3.68, and 3.85 MeV} were measured at 69 incident energies for 4.5&E"&11 MeV. A multiple scattering code provided a simulation of the experimental scattering process allowing accurate corrections to the small measured inelastic cross sections. The integrated "C(n, n)' Be cross section was determined by subtracting the sum of the measured integrated cross sections from the total. Shell-model calculations were used to generate the R-matrix parameters for the elastic and first three inelastic channels of "C+n, and, after some minor adjustments, the predicted structure generally agreed with experiment for E"&4MeV. Previous elastic "C+n data were refitted to replace constant Ro R-matrix background terms by more realistic broad states and to achieve better agreement with model calculations and the data. R-matrix fitting of the full data set produced new ' C level information. For E"&4 MeV (E & 12 MeV), five states were given definite J assignments and three states tentative assignments.

α decay of excited states inC14

“…Analysis was performed of the breakup of the excited 14 C nuclei into 10 Be + α at forward angles in the projectiletarget center-of-mass frame. Here the dominant excitation mechanism was expected to be inelastic scattering.…”

A preliminary study on the use of 10Be in forensic radioecology of nuclear explosion sites

“…They believe those contributions are minimal. From Resler et al (1989), the only energies in which there are significant cross sections for the reaction are the region 6.05 to 9.35 MeV. The higher energy contribution is calculated to be much less significant.…”

“…2, NEA, 2005) are derived from very early work, which would be considerably improved if redone today. Errors can be several tens of percentage points, and in view of the paper of Resler et al (1989) cannot be considered accurate at high energies. Resler et al (1989) (Fig.…”

“…Errors can be several tens of percentage points, and in view of the paper of Resler et al (1989) cannot be considered accurate at high energies. Resler et al (1989) (Fig. 3) present far more preferable data on the cross-section for the reaction 13 C(n, a) 10 Be which they state are partly calculated based on indirect experimental data, but to contain possible contributions from other reactions.…”

“…The error on the point is the standard deviation on the energy spread within the region 6e9.35 MeV. Cross-section data fromResler et al (1989) with errors.…”