The decay of the most neutron-rich iron isotopes was investigated, leading to the first determination of the Fe half-life and new measurements of the half-lives of Fe. The experimental results are compared with theoretical predictions and presented in the context of the weak astrophysical rapid neutron capture process.
DOI:https://doi.org/10.1103/PhysRevC.88.064320
©2013 American Physical Society
Time distribution of the particles detected in the DSSD detector correlated with an implanted Fe, Fe, Fe, or Fe ion. The result of the fit is displayed on each panel as a solid line, while its three individual components–mother decay, daughter decay, and background–are displayed as dashed, dotted, and dash-dotted lines, respectively.
Reuse & PermissionsBackground-subtracted -coincident -ray spectrum correlated with an implanted Fe ion. The correlation time amounted to 400 ms.
Reuse & PermissionsHalf-lives for neutron-rich iron isotopes as a function of the neutron number. Experimental results from this work (red full circles) are compared to literature (empty black squares), where available, and to theoretical predictions from the FRDM + QRPA (solid black line) [3], DF3a + CQRPA (black full triangles) [4, 5], and gross theory (GT2 + HF-09, dash-dot blue line) [15]. See text for details.
Reuse & Permissions(a) Final abundances vs mass number for a weak -process simulation with entropy , time scale s, and initial electron fraction , with the theoretical decay rates of Fe increased or decreased by a factor of 5 [blue lines, final abundances or , respectively] or replaced by the experimental values from this work (red line). Scaled solar abundances from Sneden et al. [2] (crosses) are also shown for reference. While the peak and above are produced in a main -process, the dividing line between the weak and the main -processes is unclear, and the prediction of how far the weak -process proceeds is sensitive to the iron half-lives. To show this on a linear scale, panel (b) includes the percentage difference between the two abundance patterns above, .
Reuse & Permissions
