期刊
NUCLEAR PHYSICS A
卷 909, 期 -, 页码 69-78出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysa.2013.04.004
关键词
NUCLEAR REACTIONS Be-9(C-22, n(21)C); E=68 MeV/nucleon; measured E-n; I-n(theta); E(C-20 fragment); I(C-20 fragment, theta); C-21,C-22 calculated double neutron halo nucleus low-lying levels; J, Π spectrometric factor using shell model; Goldhaber model with friction term; C-21 deduced non-existence of bound state; C-20 + n deduced scattering length
资金
- National Science Foundation [PHY-05-55488, PHY-05-55439, PHY-06-51627, PHY-06-06007, PHY-08-55456, PHY-09-69173, PHY11-02511]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1101745, 1306074, 1205357, 969058] Funding Source: National Science Foundation
A search for the neutron-unbound nucleus C-21 was performed via the single-proton removal reaction from a beam of N-22 at 68 MeV/u. Neutrons were detected with the Modular Neutron Array (MoNA) in coincidence with C-20 fragments. No evidence for a low-lying state was found, and the reconstructed C-20 + n decay-energy spectrum could be described with an s-wave line shape with a scattering length limit of vertical bar a(s)vertical bar < 2.8 fm, consistent with shell-model predictions. A comparison with a renormalized zero-range three-body model suggests that C-22 is bound by less than 70 keV. (C) 2013 Elsevier B.V. All rights reserved.
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