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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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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 :
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
Yoneda, K
Date : 5 November 2012
DOI : 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 : 31 Oct 2017 14:56

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