Phys. Rev. Lett.
82,
1383–1386
(1999)
Exotic Molecular States in 12Be
M. Freer et al.
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M. Freer1,2, J. C. Angélique2, L. Axelsson3, B. Benoit4, U. Bergmann5, W. N. Catford6, S. P. G. Chappell7, N. M. Clarke1, N. Curtis6, A. D'Arrigo4, E. de Goes Brennard4, O. Dorvaux8, B. R. Fulton1, G. Giardina9, C. Gregori10, S. Grévy11,*, F. Hanappe4, G. Kelly12, M. Labiche2, C. Le Brun2, S. Leenhardt11, M. Lewitowicz13, K. Markenroth3, F. M. Marqués2, M. Motta9, J. T. Murgatroyd1, T. Nilsson3,†, A. Ninane2,‡, N. A. Orr2, I. Piqueras10, M. G. Saint Laurent13, S. M. Singer1, O. Sorlin11, L. Stuttgé8, and D. L. Watson14
1School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
2Laboratoire de Physique Corpusculaire, ISMRA and Université de Caen, IN2P3-CNRS, 14050 Caen Cedex, France
3Fysiska Institutionen, Chalmers Tekniska Högskola, S-412 96 Göteborg, Sweden
4Université Libre de Bruxelles, CP 226, B-1050 Bruxelles, Belgium
5Det Fysiske Institut, Aarhus Universitet, DK 8000 Aarhus C, Denmark
6Department of Physics, University of Surrey, Guildford, Surrey GU2 5XH, United Kingdom
7Nuclear and Astrophysics Laboratory, University of Oxford, Keble Road, Oxford OX1 3RH, United Kingdom
8Institut de Recherches Subatomique, IN2P3-CNRS/Université Louis Pasteur, BP 28, 67037 Strasbourg Cedex, France
9Istituto Nazionale di Fisica Nucleare, Sezione di Catania and Dipartimento di Fisica, Universitá di Messina, Messina, Italy
10Instituto Estructura de la Materia, CSIC, E-28006 Madrid, Spain
11Institut de Physique Nucléaire, IN2P3-CNRS, 91406 Orsay Cedex, France
12School of Sciences, Staffordshire University, College Road, Stoke-on-Trent ST4 2DE, United Kingdom
13GANIL (CEA/DSM-CNRS/IN2P3), BP 5027, 14076 Caen Cedex, France
14Department of Physics, University of York, York YO1 5DD, United Kingdom
Received 11 August 1998; published in the issue dated 15 February 1999
See accompanying
Physics
Focus
The breakup of 12Be into 6He+6He and 4He+8He has been studied using a 378 MeV 12Be beam inelastically excited by 12C and (CH2)n targets. The measurements indicate that breakup occurs from rotational states in the 10 to 25 MeV excitation energy interval, with spins in the range of 4ħ to 8ħ. The inferred moment of inertia is consistent with the cluster decay of an exotic molecular structure in 12Be, which may be associated with an α-4n-α cluster configuration.
© 1999 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.1383
DOI:
10.1103/PhysRevLett.82.1383
PACS:
21.10.Hw, 21.60.Gx, 25.70.Ef, 27.20.+n
*Present address: Laboratoire de Physique Corpusculaire, ISMRA et Université de Caen, IN2P3-CNRS, Bd Maréchal Juin, 14050 Caen Cedex, France. †Present address: ISOLDE, PPE-Division, CERN, CH-1211 Geneve 23, Switzerland. ‡On leave from Institut de Physique, Université Catholique de Louvain, Louvain-la-Neuve, Belgium.
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