Direct evidence for the breakdown of the N=8 shell closure in $^{12}$Be - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review Letters Year : 2000

Direct evidence for the breakdown of the N=8 shell closure in $^{12}$Be

A. Navin
  • Function : Author
D.W. Anthony
  • Function : Author
T. Aumann
  • Function : Author
T. Baumann
  • Function : Author
Dominique Bazin
  • Function : Author
B.A. Brown
  • Function : Author
T. Glasmacher
  • Function : Author
P.G. Hansen
  • Function : Author
R.W. Ibbotson
  • Function : Author
P.A. Lofy
  • Function : Author
V. Maddalena
  • Function : Author
K. G. Miller
  • Function : Author
T. Nakamura
  • Function : Author
B.V. Pritychenko
  • Function : Author
B.M. Sherrill
  • Function : Author
E. Spears
  • Function : Author
M. Steiner
  • Function : Author
J.A. Tostevin
  • Function : Author
J. Yurkon
  • Function : Author
A. Wagner
  • Function : Author

Abstract

Partial cross sections and corresponding momentum distributions have been studied in the: one-neutron knockout reaction (Be-12. Be-11 + gamma) on a Be-9 target at 78 MeV/nucleon. The resulting spectroscopic factors for the only two bound starts of Be-11 an 0.42 +/- 0.06 (1/2(+)) and 0.37 +/- 0.06 (1/2(-)), where the errors an experimental only. This result shows that N = 8 is not a good closed shell in the neutron-rich Be-12 and that the last neutron pair is two-thirds in the (1s(2) + 0d(2)) intruder configuration.
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Dates and versions

in2p3-00005977 , version 1 (04-09-2000)

Identifiers

  • HAL Id : in2p3-00005977 , version 1

Cite

A. Navin, D.W. Anthony, T. Aumann, T. Baumann, Dominique Bazin, et al.. Direct evidence for the breakdown of the N=8 shell closure in $^{12}$Be. Physical Review Letters, 2000, 85, pp.266-269. ⟨in2p3-00005977⟩
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