Eur. Phys. J. Special Topics 150, 9-12 (2007)
https://doi.org/10.1140/epjst/e2007-00252-2

The search for ⁷H

¹ Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
² GANIL, Bd Henri Becquerel, BP. 55027, 14076 Caen Cedex 05, France
³ University of Liverpool, Liverpool, L69 7ZE, UK
⁴ CEA/DSM/DAPNIA, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
⁵ Institute of Nuclear Chemistry, University of Mainz, 55128 Mainz, Germany
⁶ CCLRC Daresbury Laboratory, Daresbury Warrington Cheshire, WA4 4AD, UK
⁷ The Henryk Niewodniczański Institute of Nuclear Physics, PAN, Kraków, Poland

Received: 31 January 2007
Published online: 8 December 2007

Abstract

This work focuses on the experimental search and characterisation of the super-heavy ⁷H, using a one-proton transfer reaction ¹²C(⁸He,⁷H)¹³N. A ⁸He primary beam at 15.4 A MeV was delivered by the GANIL-SPIRAL facility and impinged on a gaseous carbon target, the active target MAYA, where ⁷H was produced and detected. ⁷H was observed as a resonance 0.57^+0.42_-0.21 MeV above the ³H+4n subsystem mass, with an associated width of 0.09^+0.94_-0.06 MeV. The differential cross-section of ⁷H production for the ¹²C(⁸He,⁷H)¹³N reaction yields 40.1^+58.0_-30.6 μb/sr. This experiment demonstrates the advantage of using the active target technique particularly well suited for the detection of low energy residues.