title: Resonance state in 7H.
abstract: The existence of the 7H nuclear system was investigated via a one-proton transfer reaction with a 8He beam at 15.4A MeV and a 12C gas target. The experimental setup was based on the active-target MAYA which allowed a complete reconstruction of the reaction kinematics. The existence of the 7H was confirmed with the identification of seven events where the system was formed with a resonance energy of 0.57(-0.21)(+0.42) MeV above the 3H+4n threshold and a resonance width of 0.09(-0.06)(+0.94) MeV. This study represents an unambiguous proof of the existence of the most neutron-proton unbalanced system presently found.
authors.affiliation: Department of Particle Physics, Universidade de Santiago de Compostela, E-15782, Santiago de Compostela, Spain. caamano@ganil.fr
authors.forename: M
authors.initials: M
authors.lastname: Caamaño
authors.forename: D
authors.initials: D
authors.lastname: Cortina-Gil
authors.forename: W
authors.initials: W
authors.lastname: Mittig
authors.forename: H
authors.initials: H
authors.lastname: Savajols
authors.forename: M
authors.initials: M
authors.lastname: Chartier
authors.forename: C E
authors.initials: CE
authors.lastname: Demonchy
authors.forename: B
authors.initials: B
authors.lastname: Fernández
authors.forename: M B
authors.initials: MB
authors.lastname: Gómez Hornillos
authors.forename: A
authors.initials: A
authors.lastname: Gillibert
authors.forename: B
authors.initials: B
authors.lastname: Jurado
authors.forename: O
authors.initials: O
authors.lastname: Kiselev
authors.forename: R
authors.initials: R
authors.lastname: Lemmon
authors.forename: A
authors.initials: A
authors.lastname: Obertelli
authors.forename: F
authors.initials: F
authors.lastname: Rejmund
authors.forename: M
authors.initials: M
authors.lastname: Rejmund
authors.forename: P
authors.initials: P
authors.lastname: Roussel-Chomaz
authors.forename: R
authors.initials: R
authors.lastname: Wolski