Multiple particle emission after [sup 11]Li beta-decay: exploring new decay channels

We present here a study of the three‐body, nα6He particle break‐up of 11Be(10.6) following 11Li β‐decay. The emitted charged particles were detected in coincidence using a cubic set‐up of highly segmented silicon detectors, allowing us to measure simultaneously energy and trajectory. The three body break‐up of 11Be(10.5) through the intermediate state 10Be(9.6) was modeled using the multiple‐level single‐channel R‐Matrix formalism.