Emergence of the N=16 shell gap in $^{21}$O

B. Fernandez-Dominguez; J. S. Thomas; W. N. Catford; F. Delaunay; S. M. Brown; N.A. Orr; M. Rejmund; N.L. Achouri; H. Al Falou; N. A. Ashwood; D. Beaumel; Y. Blumenfeld; B. A. Brown; R. Chapman; M. Chartier; N. Curtis; C. Force; G. De France; S. Franchoo; J. Guillot; P. Haigh; F. Hammache; M. Labiche; V. Lapoux; R. C. Lemmon; F. Marechal; A. Moro; B. Martin; X. Mougeot; B. Mouginot; L. Nalpas; A. Navin; N. Patterson; B. Pietras; E. C. Pollacco; A. Leprince; A. Ramus; J. A. Scarpaci; N. De Séréville; I. Stefan; O. Sorlin; G. Wilson

HAL : in2p3-00548964, version 1

arXiv : 1012.4040

DOI : 10.1103/PhysRevC.84.011301

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Physical Review C 84 (2011) 011301

Emergence of the N=16 shell gap in $^{21}$O

B. Fernandez-Dominguez^{1, 2}, J. S. Thomas, W. N. Catford, F. Delaunay², S. M. Brown, N.A. Orr², M. Rejmund¹, N.L. Achouri², H. Al Falou², N. A. Ashwood, D. Beaumel³, Y. Blumenfeld³, B. A. Brown, R. Chapman, M. Chartier, N. Curtis, C. Force¹, G. De France¹, S. Franchoo³, J. Guillot³, P. Haigh, F. Hammache³, M. Labiche, V. Lapoux⁴, R. C. Lemmon, F. Marechal³, A. Moro, B. Martin⁴, X. Mougeot⁴, B. Mouginot³, L. Nalpas⁴, A. Navin¹, N. Patterson, B. Pietras, E. C. Pollacco⁴, A. Leprince², A. Ramus, J. A. Scarpaci³, N. De Séréville³, I. Stefan³, O. Sorlin¹, G. Wilson

SPIRAL Collaboration(s)

(2011)

The spectroscopy of 21O has been investigated using a radioactive 20O beam and the (d,p) reaction in inverse kinematics. The ground and first excited states have been determined to be Jpi=5/2+ and Jpi=1/2+ respectively. Two neutron unbound states were observed at excitation energies of 4.76 +- 0.10 and 6.16 +- 0.11. The spectroscopic factor deduced for the lower of these interpreted as a 3/2+ level, reveals a rather pure 0d3/2 single-particle configuration. The large energy difference between the 3/2+ and 1/2+ states is indicative of the emergence of the N=16 magic number. For the higher lying resonance, which has a character consistent with a spin-parity assignment of 3/2+ or 7/2-, a 71% branching ratio to the first 2+ state in 20O has been observed. The results are compared with new shell model calculations.

1 :	GANIL - Grand Accélérateur National d'Ions Lourds

2 :	LPCC - Laboratoire de Physique Corpusculaire de Caen

3 :	IPNO - Institut de Physique Nucléaire d'Orsay

4 :	IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)

équipe(s) de recherche : Structure nucléaire

Thème(s)

Physique/Physique Nucléaire Expérimentale

Lien vers le texte intégral :

http://fr.arXiv.org/abs/1012.4040


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