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Evidence for 6{\Lambda}H

Abstract : Evidence for the neutron-rich hypernucleus 6{\Lambda}H is presented from the FINUDA experiment at DA{\Phi}NE, Frascati, studying ({\pi}+, {\pi}-) pairs in coincidence from the K- +6Li \rightarrow 6 H+{\pi}+ production reaction followed by 6{\Lambda}H \rightarrow 6He + {\pi}- weak decay. The production rate of 6{\Lambda}H undergoing this two-body {\pi}- decay is determined to be (2.9\pm2.0)\cdot10-6/K-. Its binding energy, evaluated jointly from production and decay, is B{\Lambda}(6{\Lambda}H) = (4.0\pm1.1) MeV with respect to 5H+{\Lambda}. A systematic difference of (0.98 \pm 0.74) MeV between B{\Lambda} values derived separately from decay and from production is tentatively assigned to the 6{\Lambda}H 0+g.s. \rightarrow 1+ excitation.
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Contributor : Dominique Girod <>
Submitted on : Friday, May 4, 2012 - 3:08:58 PM
Last modification on : Monday, February 10, 2020 - 6:12:35 PM

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M. Agnello, L. Benussi, M. Bertani, H. C. Bhang, G. Bonomi, et al.. Evidence for 6{\Lambda}H. Physical Review Letters, American Physical Society, 2012, 108, pp.042501. ⟨10.1103/PhysRevLett.108.042501⟩. ⟨in2p3-00694517⟩



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