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题名:
Experimental study of the knockout reaction mechanism using O-14 at 60 MeV/nucleon
作者: Sun, YL; Lee, J; Ye, YL; Obertelli, A; Li, ZH; Aoi, N; Ong, HJ; Ayyad, Y; Bertulani, CA; Chen, J; Corsi, A; Cappuzzello, F; Cavallaro, M; Furono, T; Ge, YC; Hashimoto, T; Ideguchi, E; Kawabata, T; Lou, JL; Li, QT; Lorusso, G; Lu, F; Liu, HN; Nishimura, S; Suzuki, H; Tanaka, J; Tanaka, M; Tran, DT; Tsang, MB; Wu, J; Xu, ZY; Yamamoto, T
刊名: PHYSICAL REVIEW C
出版日期: 2016
卷号: 93, 期号:4, 页码:
关键词: STATE
DOI: 10.1103/PhysRevC.93.044607
通讯作者: Ye, YL (reprint author), Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China. ; Lee, J (reprint author), RIKEN, Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan. ; Lee, J (reprint author), Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China. ; Ye, YL (reprint author), Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA.
文章类型: 期刊文献
英文摘要: Background: For the deeply bound one-nucleon removal at intermediate energies using a Be-9 or C-12 target, a strong reduction of cross section was observed relative to the prediction of eikonal theoretical model. The large disagreement has not been explained and the systematic trend is inconsistent with results from transfer reactions. The recently observed asymmetric parallel momentum distribution of the knockout residue indicates the significant dissipative core-target interaction in the knockout reaction with a composite target, implying new reaction mechanisms beyond the eikonal reaction descriptions. Purpose: To investigate the reaction mechanism for deeply bound nucleon removal at intermediate energies. Method: Neutron removal from O-14 using a C-12 target at 60 MeV/nucleon was performed. Nucleon knockout cross sections were measured. The unbound excited states of O-13 were reconstructed by using the invariant mass method with the residues and the associated decay protons measured in coincidence. The measured cross sections are compared with an intra-nuclear cascade (INC) prediction. Results: The measured cross section of (O-14, C-11) is 60(9) mb, which is 3.5 times larger than that of (O-14, O-13) channel. This 2pn-removal cross section is consistent with INC prediction, which is 66 mb with the main contribution being non-direct reaction processes. On the other hand, the upper limit of the cross section for one-neutron removal from O-14 followed by proton evaporation is 4.6(20) mb, integrated up to 6 MeV above the proton separation energy of O-13. The calculated total cross section for such reaction processes by the INC model is 2.5 mb, which is within the measured upper limit. Conclusions: The data provide the first constraint on the role of core excitation and evaporation processes in deeply bound nucleon removal from asymmetric nuclei. The experiment results suggest that non-direct reaction processes, which are not considered in the eikonal model, play an important role in deeply bound nucleon removal from asymmetric nuclei at intermediate energies.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000373978900003
ISSN号: 2469-9985
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/25721
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
Sun, YL,Lee, J,Ye, YL,et al. Experimental study of the knockout reaction mechanism using O-14 at 60 MeV/nucleon[J]. PHYSICAL REVIEW C,2016-01-01,93(4):—.
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