Hunting for the g-decay of 7Li into the continuum by the cold neutron capture reaction 6Li(n,γ)7Li: a second attempt
We propose a follow up experiment to measure the g decay of 7Li into the continuum, after cold neutron capture on 6Li (at 7.251 MeV). In a first run, the g emission was reconstructed from the missing energy, which can be deduced from the energy of 4He and 3H, measured by a pair of Si DSSD detectors. The data set was significantly contaminated by background events from random coincidences from neutron capture on 10B, imposing a significant limitation to the cross section estimate - upper limits, in two restricted regions of the 7Li excitation energy spectrum, were obtained. The results are in accordance with newly developed calculations based on the 7Li cluster model. In the new measurement, the setup will be improved by requiring a narrow coincidence time window between 4He and 3H particles. A thinner Al foil will be used to implant the 6Li ions, thus lowering the particle detection energy thresholds. Two/three scintillators made of novel materials (CLLB, CLYC or LaBr3) will also be added to monitor the environmental background from gamma and neutron interactions in view of future direct measurements of the g decay of 7Li into the continuum.
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LEONI Silvia; BOIANO Ciro; BOTTONI Simone; BRACCO Angela; BRAMBILLA Sergio; CAMERA Franco; CIEPLICKA ORYNCZAK Natalia; CRESPI Fabio; FORNAL Bogdan; FYNBO Hans; GAD Andreas; R. Gernhäuser; L. W. Iskra; JENTSCHEL Michael; KOESTER Ulli; KOESTER Ulli; MICHELAGNOLI Caterina; MUTTI Paolo; NANNINI Adriana; RIISAGER Karsten; ROCCHINI Marco; SFERRAZZA Michele; SOLDNER Torsten; TENGBLAD Olof; WERNER Lukas and WIELAND oliver. (2018). Hunting for the g-decay of 7Li into the continuum by the cold neutron capture reaction 6Li(n,γ)7Li: a second attempt. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.3-07-382
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