Measurement of the $\pi^-$ decay width of $^5_\Lambda$He

A. Banu; A. Toyoda; B. H. Kang; E. H. Kim; H. C. Bhang; H. J. Yim; H. Noumi; H. Outa; H. Park; H. Tamura

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Measurement of the $\pi^-$ decay width of $^5_\Lambda$He

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arxiv nucl-ex/0402023 v1 pith:NECD3QPI submitted 2004-02-27 nucl-ex

S. Kameoka , S. Ajimura , K. Aoki , A. Banu , H. C. Bhang , T. Fukuda , O. Hashimoto , J. I. Hwang

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B. H. Kang E. H. Kim J. H. Kim M. J. Kim T. Maruta Y. Miura Y. Miyake T. Nagae M. Nakamura S. N. Nakamura H. Noumi S. Okada Y. Okayasu H. Outa H. Park P. K. Saha Y. Sato M. Sekimoto T. Takahashi H. Tamura K. Tanida A. Toyoda K. Tsukada T. Watanabe H. J. Yim

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keywords lambdaalphadecaywidthcentraldemonstratedderivedexpected

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abstract

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.

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