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Physical Review C 86 (2012) 054604
One and two neutron removal reactions from the most neutron-rich carbon isotopes
N. Kobayashi, T. Nakamura, J. A. Tostevin, Y. Kondo, N. Aoi, H. Baba, S. Deguchi, J. Gibelin1, M. Ishihara, Y. Kawada, T. Kubo, T. Motobayashi, T. Ohnishi, N.A. Orr1, H. Otsu, H. Sakurai, Y. Satou, E. C. Simpson, T. Sumikama, H. Takeda, M. Takechi, S. Takeuchi, K. N. Tanaka, N. Tanaka, Y. Togano, K. Yoneda

The structure of $^{19,20,22}$C has been investigated using high-energy (about 240 MeV/nucleon) one- and two-neutron removal reactions on a carbon target. Measurements were made of the inclusive cross sections and momentum distributions for the charged residues. Narrow momentum distributions were observed for one-neutron removal from $^{19}$C and $^{20}$C and two-neutron removal from $^{22}$C. Two-neutron removal from $^{20}$C resulted in a relatively broad momentum distribution. The results are compared with eikonal-model calculations combined with shell-model structure information. The neutron-removal cross sections and associated momentum distributions are calculated for transitions to both the particle-bound and particle-unbound final states. The calculations take into account the population of the mass $A-1$ reaction residues, $^{A-1}$C, and, following one-neutron emission after one-neutron removal, the mass $A-2$ two-neutron removal residues, $^{A-2}$C. The smaller contributions of direct two-neutron removal, that populate the $^{A-2}$C residues in a single step, are also computed. The data and calculations are shown to be in good overall agreement and consistent with the predicted shell-model ground state configurations and the one-neutron overlaps with low-lying states in $^{18-21}$C. These suggest significant $\nu{s}_{1/2}^2$ valence neutron configurations in both $^{20}$C and $^{22}$C. The results for $^{22}$C strongly support the picture of $^{22}$C as a two-neutron halo nucleus with a dominant $\nu{s}_{1/2}^2$ ground state configuration.
1 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
structure nucléaire
Physique/Physique Nucléaire Expérimentale
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