| Autor: |
Y. Ezra, E. Piasetzky, J. Tinsley, Z. Weinfeld, A. Klein, J. R. Comfort, R. Weiss, M. J. Leitch, D.H. Wright, C. S. Mishra, Helmut W. Baer, C. Allgower |
| Rok vydání: |
1992 |
| Předmět: |
|
| Zdroj: |
Physics Letters B. 294:157-161 |
| ISSN: |
0370-2693 |
| DOI: |
10.1016/0370-2693(92)90676-u |
| Popis: |
The forward angle differential cross sections of ( π + , π − ) reactions on the calcium isotopes to the double-isobaric-analog (DIAS) and ground states (GS) were measured between 25 and 65 MeV. These low-energy cross sections are up to an order of magnitude larger than those at resonance energies. The forward-angle excitation functions of 42 Ca, 44 Ca DIAS and 44 Ca GS transitions peak around 50 MeV. The 48 Ca DIAS cross section exhibits a minimum at about 50 MeV and that for the GS has a peak which is shifted to lower energy with a smaller cross section than that of the other nuclei. The observed behaviour is inconsistent with theoretical expectations. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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