Speaker
Description
The β-decay of 8He and 9Li are observed as background in neutrino detectors where the detection mechanism is inverse β-decay by the reaction ν + p → e+ + n. Both nuclei have decay-branches that mimic this signal by emission of an electron and a neutron, which in addition to decay-decay branches of interest for pure nuclear physic motivates their study at the ISOLDE decay station, IDS.
At IDS a setup capable of measuring neutron, charged particles and gamma rays in coincidence has been developed. The neutrons are measured with the time of flight array INDiE, where the start signal comes from β-particles impinging on plastic scintillators near the collection point. 8He decay was collected in May 2022, while measurement of 9Li is foreseen for 2024.
In this contribution focus will be on improvement of the resolution of the neutron spectra from the INDiE array. The array consists of flat bars of extended length, and different points of interaction correspond therefore to different flight paths. The point of interaction can be determined by the time difference of signals from photomultiplier tubes in either end of an INDiE bar, which then provides input to the geometric correction to the time of flight. This correction, however, is disturbed by timing jitter on all detectors, leading to an under estimation of TOF and decreased resolution since the correction is asymmetric. In my work, I present a new method of correction, which mitigates this effect.
