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

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.
Document type :
Journal articles

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Submitted on : Monday, September 4, 2000 - 3:00:00 PM
Last modification on : Sunday, June 26, 2022 - 11:42:46 AM

### Identifiers

• HAL Id : in2p3-00005977, version 1

### Citation

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, American Physical Society, 2000, 85, pp.266-269. ⟨in2p3-00005977⟩

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