Experimental evidence of a component to the 12Be ground state

S. D. Pain; W. N. Catford; N. A. Orr; J. C. Angelique; N. I. Ashwood; V. Bouchat; N. M. Clarke; N. Curtis; M. Freer; B. R. Fulton; F. Hanappe; M. Labiche; J. L. Lecouey; R. C. Lemmon; D. Mahboub; A. Ninane; G. Normand; N. Soić; L. Stuttge; C. N. Timis; J. A. Tostevin; J. S. Winfield; V. Ziman

doi:10.1140/epjad/i2005-06-186-9

EPJ

Experimental evidence of a $\mathrm{\ensuremath{\nu(1d_{^5\!/_2})^2}}$ component to the ¹²Be ground state

S. D. Pain¹^*, W. N. Catford¹, N. A. Orr², J. C. Angelique², N. I. Ashwood³, V. Bouchat⁴, N. M. Clarke³, N. Curtis³, M. Freer³, B. R. Fulton⁵, F. Hanappe⁴, M. Labiche⁶, J. L. Lecouey², R. C. Lemmon⁷, D. Mahboub¹, A. Ninane⁸, G. Normand², N. Soić³, L. Stuttge⁹, C. N. Timis¹, J. A. Tostevin¹, J. S. Winfield¹⁰ and V. Ziman³

¹ Department of Physics, University of Surrey, GU2 7XH, Guildford, Surrey, UK
² Laboratoire de Physique Corpusculaire, ISMRA and Université de Caen, IN2P3-CNRS, 14050, Caen Cedex, France
³ School of Physics and Astronomy, University of Birmingham, B15 2TT, Edgbaston, Birmingham, UK
⁴ Université Libre de Bruxelles, CP 226, B-1050, Bruxelles, Belgium
⁵ Department of Physics, University of York, YO10 5DD, Heslington, York, UK
⁶ University of Paisley, High Street, PA1 2BE, Paisley, Scotland, UK
⁷ CLRC Daresbury Laboratory, Cheshire, WA4 4AD, Daresbury, Warrington, UK
⁸ Institut de Physique, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
⁹ Institut de Recherche Subatomique, IN2P3-CNRS/Université de Louis Pasteur, BP 28, 67037, Strasbourg Cedex, France
¹⁰ Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, I-95123, Catania, Italy

Received: 31 January 2005
Accepted: 28 April 2005
Published online: 19 July 2005

Abstract

Data have been obtained on exclusive single neutron knockout cross sections from ¹²Be to study its ground state structure. Preliminary cross sections for the first (0.32 MeV, $\ensuremath{^1\!/_2 ^-}$ ) and second (1.78 MeV, $\ensuremath{^5\!/_2 ^+}$ , unbound) excited states in ¹¹Be have been obtained, giving evidence of significant admixtures of both $\ensuremath{\nu(1p_{^1\!/_2})^2}$ and $\ensuremath{\nu(1d_{^5\!/_2})^2}$ configurations in the ground state of ¹²Be.

PACS: 27.20.+n 6 ⩽ A ⩽ 19 – / 24.10.-i Nuclear reaction models and methods – / 25.60.-t Reactions induced by unstable nuclei – / 25.70.-z Low and intermediate energy heavy-ion reactions –

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Experimental evidence of a component to the 12Be ground state

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Experimental evidence of a $\mathrm{\ensuremath{\nu(1d_{^5\!/_2})^2}}$ component to the ¹²Be ground state