Bibliographic Details
| Title: |
Solving the stellar 62Ni problem with AMS |
| Authors: |
Dillmann, I.1 iris.dillmann@ph.tum.de, Faestermann, T.1, Korschinek, G.1, Lachner, J.1, Maiti, M.1, Poutivtsev, M.1, Rugel, G.1, Walter, S.2, Käppeler, F.2, Erhard, M.3, Junghans, A.R.3, Nair, C.3, Schwengner, R.3, Wagner, A.3 |
| Source: |
Nuclear Instruments & Methods in Physics Research Section B. Apr2010, Vol. 268 Issue 7/8, p1283-1286. 4p. |
| Subjects: |
Accelerator mass spectrometry, Nickel isotopes, Neutron capture, Nuclear cross sections, Particle accelerators, Temperature effect, Time-of-flight mass spectrometry, Forschungszentrum Dresden-Rossendorf e.V. |
| Abstract: |
Abstract: An accurate knowledge of the neutron capture cross sections of 62,63Ni is crucial since both isotopes take key positions which affect the whole reaction flow in the weak s process up to . No experimental value for the 63Ni cross section exists so far, and until recently the experimental values for 62Ni at stellar temperatures ranged between 12 and 37mb. This latter discrepancy could now be solved by two activations with following AMS using the GAMS setup at the Munich tandem accelerator which are also in perfect agreement with a recent time-of-flight measurement. The resulting (preliminary) Maxwellian cross section at kT =30keV was determined to be . Additionally, we have measured the 64Ni 63Ni cross section close to threshold. Photoactivations at 13.5MeV, 11.4MeV and 10.3MeV were carried out with the ELBE accelerator at Forschungszentrum Dresden-Rossendorf. A first AMS measurement of the sample activated at 13.5MeV revealed a cross section smaller by more than a factor of 2 compared to NON-SMOKER predictions. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
