Polarization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi/></mml:mrow><mml:mrow><mml:mi mathvariant="italic">Λ</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msubsup></mml:mrow><mml:mi>He</mml:mi></mml:math>Produced by the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mo>,</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">K</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mo>)</mml:mo></mml:math>Reaction

199817 citationsJournal Article

Authors

S. Ajimura · Osaka University

Masahiro Ishikawa · Osaka University

K. Ikeda · Osaka University

T. Kishimoto · Osaka University

A. Okusu · Osaka University

N. Shinkai · Osaka University

Y. Tanaka · Osaka University

Abstract

We have measured the polarization of ${}_{\ensuremath{\Lambda}}^{5}\mathrm{He}$ produced by the $({\ensuremath{\pi}}^{+}{,K}^{+})$ 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 to ${}_{\ensuremath{\Lambda}}^{5}\mathrm{He}$, 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.

Topics & Keywords

Particle physics theoretical and experimental studies Quantum Chromodynamics and Particle Interactions Black Holes and Theoretical Physics

Publication Details

Published in: Physical Review Letters

Volume 80, Issue 16, pp. 3471-3474

DOI: 10.1103/physrevlett.80.3471

Field-Weighted Citation Impact: 3.84

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