期刊
PHYSICAL REVIEW C
卷 86, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.86.054604
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) Japan [22340053]
- Global Center of Excellence Program Nanoscience and Quantum Physics
- United Kingdom Science and Technology Facilities Council (STFC) [ST/F012012, ST/J000051]
- NRF of MEST Korea [R32-2008-000-10155-0, 2010-0027136]
- MEXT [22.9675]
- Department of Physics, Tokyo Institute of Technology
- E.C.S.
- United Kingdom Engineering and Physical Sciences Research Council (EPSRC) [EP/P503892/1]
- Franco-Japanese Nuclear Structure Program LIA
- Grants-in-Aid for Scientific Research [22340053, 10J09675, 22340072, 24740154, 24105005, 24105001] Funding Source: KAKEN
- Ministry of Education, Science & Technology (MoST), Republic of Korea [R32-2008-000-10155-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-0027136] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Science and Technology Facilities Council [ST/J000051/1] Funding Source: researchfish
- STFC [ST/J000051/1] Funding Source: UKRI
The structure of C-19,C-20,C-22 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 C-19 and C-20 and two-neutron removal from C-22. Two-neutron removal from C-20 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 CA-1 and, following one-neutron emission after one-neutron removal, the mass A - 2 two-neutron removal residues CA-2. The smaller contributions of direct two-neutron removal, that populate the CA-2 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 C18-21. These suggest significant nu s(1/2)(2) valence neutron configurations in both C-20 and C-22. The results for C-22 strongly support the picture of C-22 as a two-neutron halo nucleus with a dominant nu s(1/2)(2) ground-state configuration.
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