Measurement of the $\pi^-$ decay width of $^5_\Lambda$He
  We have precisely measured $\Lambda \to p\pi^-$ decay width of \5LHe and demonstrated significantly larger $\alpha$ -$\Lambda$ overlap than expected from the central repulsion $\alpha$-$\Lambda$ potential, which is derived from YNG \Lambda$-nucleon interaction. 
S. Kameoka, S. Ajimura, K. Aoki, A. Banu, H. C. Bhang, T. Fukuda, O.   Hashimoto, J. I. Hwang, B. H. Kang, E. H. Kim, J. H. ...