High-energy two-neutron removal from Be10

N. I. Ashwood, M. Freer, D. J. Millener, N. A. Orr, F. Carstoiu, S. Ahmed, J. C. Angélique, V. Bouchat, W. N. Catford, N. M. Clarke, N. Curtis, F. Hanappe, M. Horoi, Y. Kerckx, J. L. Lecouey, F. M. Marqués, T. Materna, G. Normand, S. Pain, N. Soić, C. Timis, A. Unshakova, and V. A. Ziman
Phys. Rev. C 72, 024314 – Published 18 August 2005

Abstract

A kinetically complete measurement of the C12(Be10, α+α+n) and (Be10, α+α) reactions has been performed at a beam energy of 30 MeV/nucleon. The charged beam velocity particles were detected in an array of Si-CsI detectors placed at zero degrees, and the neutrons in an 81-element neutron array. The coincident detection of the final-state particles, produced in the breakup of Be10, allowed the reconstruction of the excitation energy in the Be8 and Be9 systems. States in Be8 were identified, in particular the ground and first-excited states; and in Be9, states at 1.68, 2.43, and (2.78, 3.05) MeV were observed. The population of these levels, in particular the 2.43 MeV 5/2 level, suggests that collective excitations play an important role in the neutron removal process. Distorted wave Born approximation and Glauber-type calculations have been used to model the direct neutron removal from the Be10 ground state and the two-step removal via inelastic excitations of the Be10(2+) and Be9(5/2) excited states.

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  • Received 18 March 2005

DOI:https://doi.org/10.1103/PhysRevC.72.024314

©2005 American Physical Society

Authors & Affiliations

N. I. Ashwood1, M. Freer1, D. J. Millener2, N. A. Orr3, F. Carstoiu3,4, S. Ahmed1, J. C. Angélique3, V. Bouchat5, W. N. Catford3,6, N. M. Clarke1, N. Curtis1, F. Hanappe5, M. Horoi7, Y. Kerckx5, J. L. Lecouey3, F. M. Marqués3, T. Materna5, G. Normand3, S. Pain6, N. Soić1, C. Timis3,6, A. Unshakova8, and V. A. Ziman1

  • 1School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
  • 2Brookhaven National Laboratory, Upton, New York 11973, USA
  • 3Laboratoire de Physique Corpusculaire, ISMRA and Université de Caen, IN2P3-CNRS, F-14050 Caen Cedex, France
  • 4IFIN-HH, P.O. Box MG-6, Ro-76900 Bucharest-Magurele, Romania
  • 5Université Libre de Bruxelles, CP 226, B-1050 Bruxelles, Belgium
  • 6School of Electronics and Physical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, UK
  • 7Physics Department, Central Michigan University, Mount Pleasant, Michigan 48859, USA
  • 8Joint Institute for Nuclear Research, RU-141980, Dubna, Moscow Region, Russia

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Vol. 72, Iss. 2 — August 2005

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