title: Evidence for heavy hyperhydrogen (Λ)(6)h.
abstract: Evidence for the neutron-rich hypernucleus (Λ)(6)H is presented from the FINUDA experiment at DAΦNE, Frascati, studying (π+,π-) pairs in coincidence from the K(stop)(-) + (6)Li →(Λ)(6)H + π+ production reaction followed by (Λ)(6)H → (6)He + π- weak decay. The production rate of (Λ)(6) undergoing this two-body π- decay is determined to be (2.9 ± 2.0) × 10(-6)/K(stop)(-). Its binding energy, evaluated jointly from production and decay, is BΛ((Λ)(6)H) = (4.0 ± 1.1) MeV with respect to (5)H+Λ. A systematic difference of (0.98 ± 0.74) MeV between BΛ values derived separately from decay and from production is tentatively assigned to the (Λ)(6)H 0(g.s.)(+) → 1+ excitation.
authors.affiliation: Dipartimento di Fisica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Agnello
authors.forename: L
authors.initials: L
authors.lastname: Benussi
authors.forename: M
authors.initials: M
authors.lastname: Bertani
authors.forename: H C
authors.initials: HC
authors.lastname: Bhang
authors.forename: G
authors.initials: G
authors.lastname: Bonomi
authors.forename: E
authors.initials: E
authors.lastname: Botta
authors.forename: M
authors.initials: M
authors.lastname: Bregant
authors.forename: T
authors.initials: T
authors.lastname: Bressani
authors.forename: S
authors.initials: S
authors.lastname: Bufalino
authors.forename: L
authors.initials: L
authors.lastname: Busso
authors.forename: D
authors.initials: D
authors.lastname: Calvo
authors.forename: P
authors.initials: P
authors.lastname: Camerini
authors.forename: B
authors.initials: B
authors.lastname: Dalena
authors.forename: F
authors.initials: F
authors.lastname: De Mori
authors.forename: G
authors.initials: G
authors.lastname: D'Erasmo
authors.forename: F L
authors.initials: FL
authors.lastname: Fabbri
authors.forename: A
authors.initials: A
authors.lastname: Feliciello
authors.forename: A
authors.initials: A
authors.lastname: Filippi
authors.forename: E M
authors.initials: EM
authors.lastname: Fiore
authors.forename: A
authors.initials: A
authors.lastname: Fontana
authors.forename: H
authors.initials: H
authors.lastname: Fujioka
authors.forename: P
authors.initials: P
authors.lastname: Genova
authors.forename: P
authors.initials: P
authors.lastname: Gianotti
authors.forename: N
authors.initials: N
authors.lastname: Grion
authors.forename: V
authors.initials: V
authors.lastname: Lucherini
authors.forename: S
authors.initials: S
authors.lastname: Marcello
authors.forename: N
authors.initials: N
authors.lastname: Mirfakhrai
authors.forename: F
authors.initials: F
authors.lastname: Moia
authors.forename: O
authors.initials: O
authors.lastname: Morra
authors.forename: T
authors.initials: T
authors.lastname: Nagae
authors.forename: H
authors.initials: H
authors.lastname: Outa
authors.forename: A
authors.initials: A
authors.lastname: Pantaleo
authors.forename: V
authors.initials: V
authors.lastname: Paticchio
authors.forename: S
authors.initials: S
authors.lastname: Piano
authors.forename: R
authors.initials: R
authors.lastname: Rui
authors.forename: G
authors.initials: G
authors.lastname: Simonetti
authors.forename: R
authors.initials: R
authors.lastname: Wheadon
authors.forename: A
authors.initials: A
authors.lastname: Zenoni
authors.forename: A
authors.initials: A
authors.lastname: Gal