Abstract
Within the EXILL campaign a large and efficient cluster of Ge-detectors was installed around a very well collimated neutron beam. This has allowed to carry out rather complete spectroscopic studies close to the line of stability using the (n,γ) reaction. Neutron rich isotopes were produced by neutron induced fission and prompt spectroscopy was carried out. The isotope selection in this setup was based on a partially known level scheme and the use of triple coincidences. The latter is limiting the statistical sensitivity in the case of weak production yields. Based on the experiences of these campaigns we are currently developing a new setup: FIPPS (FIssion Product Prompt Spectroscopy). This setup combines a collimated neutron beam, a highly efficient cluster of Ge detectors, a gas filled magnet and auxiliary detectors. The presence of the gas filled magnet will allow us to identify fission products directly and should give access to a new quality of studies if compared to the EXILL campaign. The EXILL campaign and the FIPPS project are presented.
Highlights
Accurate thermal neutron-induced fission data is important for both fundamental nuclear physics and application in reactor physics
The EXILL campaign aimed at combining the intense cold neutron beams available at the Institut Laue-Langevin (ILL) with the EXOGAM high efficiency Ge detector array in order to perform γ-ray spectroscopy experiments of 21 (n,γ) targets [3, 4] and of the fission fragments following the neutron induced fission of 235U and 241Pu samples
In 2012-2013, during two reactor cycles (∼ 100 days), the EXOGAM Ge detector array was moved at the ILL PF1B beam line for a series of nuclear physics experiment : the EXILL campaign
Summary
Accurate thermal neutron-induced fission data is important for both fundamental nuclear physics and application in reactor physics. It shows that 235U and 241Pu targets give access to a large amount of nuclei which have currently not been studied in detail. The EXILL campaign aimed at combining the intense cold neutron beams available at the Institut Laue-Langevin (ILL) with the EXOGAM high efficiency Ge detector array in order to perform γ-ray spectroscopy experiments of 21 (n,γ) targets [3, 4] and of the fission fragments following the neutron induced fission of 235U and 241Pu samples. The EXILL setup and some key performances with actinide targets will be presented
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