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One- and two-neutron removal reactions from the most neutron-rich carbon isotopes

Kobayashi, N, Nakamura, T, Tostevin, JA, Kondo, Y, Aoi, N, Baba, H, Deguchi, S, Gibelin, J, Ishihara, M, Kawada, Y, Kubo, T, Motobayashi, T, Ohnishi, T, Orr, NA, Otsu, H, Sakurai, H, Satou, Y, Simpson, EC, Sumikama, T, Takeda, H, Takechi, M, Takeuchi, S, Tanaka, KN, Tanaka, N, Togano, Y and Yoneda, K (2012) One- and two-neutron removal reactions from the most neutron-rich carbon isotopes Physical Review C: Nuclear Physics, 86 (5), 054604.

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Abstract

The structure of 19,20,22C has been investigated using high-energy (around 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 19C and 20C and two-neutron removal from 22C. Two-neutron removal from 20C 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−1C and, following one-neutron emission after one-neutron removal, the mass A−2 two-neutron removal residues A−2C. The smaller contributions of direct two-neutron removal, that populate the A−2C 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 one-neutron overlaps with low-lying states in 18−21C. These suggest significant νs1/22 valence neutron configurations in both 20C and 22C. The results for 22C strongly support the picture of 22C as a two-neutron halo nucleus with a dominant νs1/22 ground-state configuration.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Kobayashi, NUNSPECIFIEDUNSPECIFIED
Nakamura, TUNSPECIFIEDUNSPECIFIED
Tostevin, JAUNSPECIFIEDUNSPECIFIED
Kondo, YUNSPECIFIEDUNSPECIFIED
Aoi, NUNSPECIFIEDUNSPECIFIED
Baba, HUNSPECIFIEDUNSPECIFIED
Deguchi, SUNSPECIFIEDUNSPECIFIED
Gibelin, JUNSPECIFIEDUNSPECIFIED
Ishihara, MUNSPECIFIEDUNSPECIFIED
Kawada, YUNSPECIFIEDUNSPECIFIED
Kubo, TUNSPECIFIEDUNSPECIFIED
Motobayashi, TUNSPECIFIEDUNSPECIFIED
Ohnishi, TUNSPECIFIEDUNSPECIFIED
Orr, NAUNSPECIFIEDUNSPECIFIED
Otsu, HUNSPECIFIEDUNSPECIFIED
Sakurai, HUNSPECIFIEDUNSPECIFIED
Satou, YUNSPECIFIEDUNSPECIFIED
Simpson, ECUNSPECIFIEDUNSPECIFIED
Sumikama, TUNSPECIFIEDUNSPECIFIED
Takeda, HUNSPECIFIEDUNSPECIFIED
Takechi, MUNSPECIFIEDUNSPECIFIED
Takeuchi, SUNSPECIFIEDUNSPECIFIED
Tanaka, KNUNSPECIFIEDUNSPECIFIED
Tanaka, NUNSPECIFIEDUNSPECIFIED
Togano, YUNSPECIFIEDUNSPECIFIED
Yoneda, KUNSPECIFIEDUNSPECIFIED
Date : 5 November 2012
Identification Number : 10.1103/PhysRevC.86.054604
Related URLs :
Additional Information : Copyright 2009 The American Physical Society.
Depositing User : Symplectic Elements
Date Deposited : 21 Dec 2012 10:01
Last Modified : 23 Sep 2013 19:51
URI: http://epubs.surrey.ac.uk/id/eprint/736612

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