We have measured the polarization of5ΛHe produced by the (π+, K+) reaction for the first time by observing the asymmetric emission of its weak decay pions. The large asymmetry parameter of the mesonic decay, which is unique to5ΛHe, made the measurement possible. The measurement is consistent with the theoretical prediction by which the mechanism of the hypernuclear polarization was clarified. This technique will open a new field to the spectroscopic study of hypernuclei.
ASJC Scopus subject areas
- Physics and Astronomy(all)