The FINUDA experiment at DAΦNE, Frascati, has found evidence for the neutron-rich hypernucleus 6LH studying (π+, π−) pairs in coincidence from the K−stop + 6Li →6ΛH+π+ production reaction followed by 6ΛH→6He+π− weak decay.The production rate of 6LH undergoing this two-body π− decay has been found to be (2.9 ± 2.0) · 10−6/K−stop. Its binding energy has been evaluated to be BΛ(6ΛH) = (4.0 ± 1.1) MeV with respect to 5H + Λ, jointly from production and decay. A systematic difference of (0.98 ± 0.74) MeV between BΛ values derived separately from decay and from production has been tentatively assigned to the 6ΛH 0+g.s. → 1+ excitation. A similar investigation has been carried out for the neutron-rich hypernucleus 9ΛHe study- in the K−stop + 9Be→9He+π+ reaction in coincidence with the 9He→9Li+π− weak decay; an upper limit for the production rate of 9ΛHe undergoing the two-body π− decay has been found to be 4.2 ·10−6/K−stop (90% C.L.).

Neutron-rich hypernuclei: evidence for6ΛH and search for9ΛHe

BOTTA, Elena;BRESSANI, Tullio;BUSSO, Luigi;DE MORI, FRANCESCA;MARCELLO, Simonetta;
2012-01-01

Abstract

The FINUDA experiment at DAΦNE, Frascati, has found evidence for the neutron-rich hypernucleus 6LH studying (π+, π−) pairs in coincidence from the K−stop + 6Li →6ΛH+π+ production reaction followed by 6ΛH→6He+π− weak decay.The production rate of 6LH undergoing this two-body π− decay has been found to be (2.9 ± 2.0) · 10−6/K−stop. Its binding energy has been evaluated to be BΛ(6ΛH) = (4.0 ± 1.1) MeV with respect to 5H + Λ, jointly from production and decay. A systematic difference of (0.98 ± 0.74) MeV between BΛ values derived separately from decay and from production has been tentatively assigned to the 6ΛH 0+g.s. → 1+ excitation. A similar investigation has been carried out for the neutron-rich hypernucleus 9ΛHe study- in the K−stop + 9Be→9He+π+ reaction in coincidence with the 9He→9Li+π− weak decay; an upper limit for the production rate of 9ΛHe undergoing the two-body π− decay has been found to be 4.2 ·10−6/K−stop (90% C.L.).
MESON 2012 — 12th International Workshop On Meson Production, Properties And Interaction
Cracovia (Polonia)
31/5 - 5/6 / 2012
37
01023
01023
Wrońska, A.; Agnello, M.; Benussi, L.; Bertani, M.; Bhang, H. C.; Bonomi, G.; Botta, Elena; Bregant, M.; Bressani, Tullio; Bufalino, S.; Busso, Luigi; Calvo, D.; Camerini, P.; Dalena, B.; DE MORI, Francesca; D’Erasmo, G.; Fabbri, F. L.; Feliciello, A.; Filippi, A.; Fiore, E. M.; Fontana, A.; Fujioka, H.; Genova, P.; Gianotti, P.; Grion, N.; Lucherini, V.; Marcello, Simonetta; Mirfakhrai, N.; Moia, F.; Morra, O.; Nagae, T.; Outa, H.; Pantaleo, A.; Paticchio, V.; Piano, S.; Rui, R.; Simonetti, G.; Wheadon, R.; Zenoni, A.; Gal, A.; Skibiński, R.; Guaraldo, C.; Kistryn, S. t.; Ströher, H.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/138819
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