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APS » Journals » Phys. Rev. Lett. » Volume 99 » Issue 6
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Phys. Rev. Lett. 99, 062502 (2007) [4 pages]

Resonance State in 7H

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M. Caamaño1,2,*, D. Cortina-Gil1, W. Mittig2, H. Savajols2, M. Chartier3, C. E. Demonchy2, B. Fernández3, M. B. Gómez Hornillos3, A. Gillibert4, B. Jurado2, O. Kiselev5,6, R. Lemmon7, A. Obertelli4, F. Rejmund2, M. Rejmund2, P. Roussel-Chomaz2, and R. Wolski8
1Department of Particle Physics, Universidade de Santiago de Compostela, E-15782, Santiago de Compostela, Spain
2GANIL CEA/DSM-CNRS/IN2P3, BP 55027, 14076 Caen Cedex 05, France
3Department of Physics, University of Liverpool, Oliver Loge Laboratory, L69 7ZE, United Kingdom
4CEA/DSM/DAPNIA, CEA Saclay, 91191 Gif sur Yvette Cedex, France
5Institute of Nuclear Chemistry, University of Mainz, 55128 Mainz, Germany
6PNPI, Gatchina 188300, Russia
7CCLRC Daresbury Laboratory, Warrington, Cheshire, WA4 4AD, United Kingdom
8Henryk Niewodniczański Institute of Nuclear Physics, ul. Radzikowskiego 152 31-342 Krakow, Poland

Received 8 February 2007; published 9 August 2007

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.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.062502
DOI:
10.1103/PhysRevLett.99.062502
PACS:
27.20.+n, 25.60.Je, 25.70.Ef

*caamano@ganil.fr

 
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