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Abstract
The LICORNE neutron source is a new device at the ALTO facility. Its use of inverse kinematics makes the production of naturally focused neutron beams possible with an energy range of 0.5 to 4 MeV. This is perfect for any studies concerning fast neutron induced reaction based on detection setup that require to be placed in a compact geometry - such as Ge based ? detection setup. In this paper, neutron production with LICORNE is described. The development of a gascell target and the extension of the energy range up to 7 MeV with the p(11B,n)11C are presented. An overview of the major research fields studied with LICORNE is given and two types of experiment are presented. The first one dedicated to prompt fission ?-ray emission in fission, as a function of incident neutron energy, is described. Some preliminary results are shown. The second, in the context of the MINORCA campaign, is detailed. The most recent outcomes in the data analysis process are also presented.
Highlights
The LICORNE neutron source is a new device at the ALTO facility
The aim was to add neutron beam production capability to this facility in prevision of the NFS project [3] start at GANIL
In order to be complementary with the other sources, LICORNE had to be able to produce decent fluxes of fast neutrons without the use of a very intense (< μA), or very energetic (> 100 MeV), primary beams
Summary
In 2012, at the ALTO facility [1, 2], a new project was started. The aim was to add neutron beam production capability to this facility in prevision of the NFS project [3] start at GANIL. A light primary beam impinging an heavy target is used to induce nuclear reactions which produce neutrons. In this case, the neutron emission is isotropic. In order to be complementary with the other sources, LICORNE had to be able to produce decent fluxes of fast neutrons without the use of a very intense (< μA), or very energetic (> 100 MeV), primary beams. For a beam energy lower than 16.5 MeV, the maximum opening of the cone is smaller than 29◦ In this case, an enhancement factor of Figure 1. On the right: the top panel shows the enhancement factor of the neutron flux between the inverse kinematic and the direct kinematic reaction as a function of 7Li bombarding energy. The natural collimation and neutron beam directionality provides at least two distinct advantages: (i) the placement of gamma detectors adjacent to the sample being irradiated becomes feasible; (ii) the scattered neutron background in the room will be reduced by up to a factor of 100
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