The N=14 shell closure in $^{22}$O viewed through a neutron sensitive probe

Autor: Becheva, E., Blumenfeld, Y., Khan, E., Beaumel, D., Daugas, J.M., Delaunay, F., Demonchy, C.E., Drouart, A., Fallot, Muriel, Gillibert, A., Giot, Lydie, Grasso, M., Keeley, N., W. Kemper, K., T. Khoa, D., Lapoux, V., Lima, V., Musumarra, A., Nalpas, L., C. Pollacco, E., Roig, O., Roussel-Chomaz, P., E. Sauvestre, J., A. Scarpaci, J., Skaza, F., Than, H. S.
Přispěvatelé: Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratori Nazionali del Sud (LNS), Istituto Nazionale di Fisica Nucleare (INFN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2006
Předmět:
Zdroj: Physical Review Letters
Physical Review Letters, American Physical Society, 2006, 96, pp.012501. ⟨10.1103/PhysRevLett.96.012501⟩
Physical Review Letters, 2006, 96, pp.012501. ⟨10.1103/PhysRevLett.96.012501⟩
ISSN: 0031-9007
1079-7114
Popis: NESTER PTH; International audience; To investigate the behavior of the N=14 neutron gap far from stability with a neutron-sensitive probe, proton elastic and 2+1 inelastic scattering angular distributions for the neutron-rich nucleus 22O were measured with a secondary beam intensity of only 1200 particles per second using the MUST silicon strip detector array at the GANIL facility. A phenomenological analysis yields a deformation parameter bp;p' = 0.26 +- 0.04 for the 2+1 state, much lower than in 20O, showing a surprisingly weak neutron contribution to this state. A fully microscopic analysis was performed using optical potentials obtained from matter and transition densities generated by continuum Skyrme-HFB and QRPA calculations, respectively. When the present results and those from a 22O + 197Au scattering experiment are combined, the ratio of neutron to proton contributions to the 2+1 state is found close to the N/Z ratio, demonstrating a strong N=14 shell closure in the vicinity of the neutron drip-line.
Databáze: OpenAIRE
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