234 articles – 1774 Notices  [english version]
 HAL : in2p3-00548964, version 1
 arXiv : 1012.4040
 Physical Review C 84 (2011) 011301
 Emergence of the N=16 shell gap in $^{21}$O
 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.
 équipe(s) de recherche : Structure nucléaire
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1012.4040
 in2p3-00548964, version 1 http://hal.in2p3.fr/in2p3-00548964 oai:hal.in2p3.fr:in2p3-00548964 Contributeur : Michel Lion <> Soumis le : Mardi 21 Décembre 2010, 08:51:37 Dernière modification le : Mardi 30 Avril 2013, 15:00:26