Eur. Phys. J. A (2005) 25: 315-320
https://doi.org/10.1140/epjad/i2005-06-080-6

ENAM 2004

New insights into the resonance states of ⁵H and ⁵He

¹ Joint Institute for Nuclear Research, 141980, Dubna, Russia
² The Henryk Nievodniczański Institute of Nuclear Research, Cracow, Poland
³ RIKEN, 2-1 Hirosawa, Wako, 351-0198, Saitama, Japan
⁴ GANIL, BP 5027, F-14076, Caen Cedex 5, France
⁵ Gesellschaft für Schwerionenforschung, D-64231, Darmstadt, Germany
⁶ Université Libre de Bruxelles, PNTPM, Brussels, Belgium
⁷ Institut de Recherches Subatomique, IN2P3/Université Louis Pasteur, Strasbourg, France
⁸ Centre de Recherche du Cyclotron, UCL, Chemin du Cyclotron 2, B-1348, Louvain-La-Neuve, Belgium
⁹ DSM/DAPNIA/SPhN, CEA Saclay, F-91191, Gif-sur-Yvette Cedex, France
¹⁰ RNFC - All-Russian Research Institute of Experimental Physics, 607190, Sarov, Nizhni Novgorod Region, Russia

^* e-mail: Gurgen.TerAkopian@jinr.ru

Received: 10 December 2004
Accepted: 18 February 2005
Published online: 27 May 2005

Abstract

The ⁵H system was produced in the ³H(t, p) ⁵H reaction studied at small CM angles with a 58MeV tritium ion beam. High statistics data were used to reconstruct the energy and angular correlations between the ⁵H decay fragments. A broad structure in the ⁵H missing-mass spectrum showing up above 2.5MeV was identified as a mixture of the 3/2⁺ and 5/2⁺ states. The data also present an evidence that the 1/2⁺ ground state of ⁵H is located at about 2MeV. Then, the ⁵H and ⁵He systems were explored by means of transfer reactions occurring in the interactions of 132MeV ⁶He beam nuclei with deuterium. In the ²H( ⁶He, ³H) reaction a T = 3/2 isobaric analog state of ⁵H in ⁵He was observed at an excitation energy of 22.0±0.3MeV with a width of 2.5±0.3MeV.