| Autor: |
Nils Olsson, F. P. Brady, W. Unkelbach, A. Ringbom, H. Condé, P-U Renberg, Ane Håkansson, O. Jonsson, Leif Nilsson, R. Zorro, E. Ramström, T. Rönnqvist, S.Y. van der Werf, Gunnar Tibell, Jan Blomgren |
| Rok vydání: |
1993 |
| Předmět: |
|
| Zdroj: |
Nuclear Physics A. 563:225-246 |
| ISSN: |
0375-9474 |
| DOI: |
10.1016/0375-9474(93)90603-u |
| Popis: |
Double-differential cross sections of the 54,56Fe(n, p) reactions have been measured at 97 MeV in the angular range 0–30° for excitation energies up to 40 MeV. The spectra have been decomposed into different multipolarities by a technique based on the use of sample angular distributions calculated within the distorted-wave Born approximation. From the identified Gamow-Teller strength, Sβ+ values were obtained for 54Fe and 56Fe. Comparisons with available shell-model calculations of the GT strength were made. The results are important for models of supernova explosions since electron-capture rates, which are proportional to Sβ+, in 1f2p-shell nuclei affect the dynamics of the star. At higher excitation energies, the spectra are dominated by L = 1 strength in broad distributions with a maximum at about 12 MeV. Microscopic calculations based on the random-phase approximation were performed and compared with the experimental data. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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