Abstract
We measured the total capture cross section of the reaction, as well as partial cross sections leading to the ground ( and first-excited ( states in . The measurement was carried out at average neutron energies of 157, 349, 398, 427, 468, 498, and 556 keV by using pulsed neutrons produced via the reaction and a -ray detection system based on an anti-Compton NaI(Tl) spectrometer. We observed the interference effect between the resonance state at 4554 keV of , corresponding to a neutron energy of 411 keV in the center-of-mass system, and a nonresonant contribution in the capture process. The measured partial cross sections are in good agreement with theoretical calculations obtained taking into account the interference between the resonance and a nonresonant -wave direct radiative capture contribution. Using the present results, together with our previous measurement, we derived the Maxwellian-averaged capture cross sections (MACS) for thermal energies between and 100 keV, key quantities for process nucleosynthesis studies in massive stars.
1 More- Received 28 July 2020
- Accepted 9 October 2020
DOI:https://doi.org/10.1103/PhysRevC.102.044616
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