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Quasifree Neutron Knockout from Ca-54 Corroborates Arising N=34 Neutron Magic Number
Univ Hong Kong, Dept Phys, Pokfulam, Hong Kong 999077, Peoples R China.;RIKEN Nishina Ctr, Wako, Saitama 3510198, Japan.;Peking Univ, Sch Phys, Beijing 100871, Peoples R China.;Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China..
KTH, School of Engineering Sciences (SCI), Physics. Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.;Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
KTH, School of Engineering Sciences (SCI), Physics.
RIKEN Nishina Ctr, Wako, Saitama 3510198, Japan.;Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
2019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 123, no 14, article id 142501Article in journal (Refereed) Published
Abstract [en]

Exclusive cross sections and momentum distributions have been measured for quasifree one-neutron knockout reactions from a Ca-54 beam striking on a liquid hydrogen target at similar to 200 MeV/u. A significantly larger cross section to the p(3/2), state compared to the f(5/2) state observed in the excitation of Ca-53 provides direct evidence for the nature of the N = 34 shell closure. This finding corroborates the arising of a new shell closure in neutron-rich calcium isotopes. The distorted-wave impulse approximation reaction formalism with shell model calculations using the effective GXPF1Bs interaction and ab initio calculations concur our experimental findings. Obtained transverse and parallel momentum distributions demonstrate the sensitivity of quasifree one-neutron knockout in inverse kinematics on a thick liquid hydrogen target with the reaction vertex reconstructed to final state spin-parity assignments.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 123, no 14, article id 142501
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Physical Sciences
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URN: urn:nbn:se:kth:diva-262789DOI: 10.1103/PhysRevLett.123.142501ISI: 000488270700004Scopus ID: 2-s2.0-85073071171OAI: oai:DiVA.org:kth-262789DiVA, id: diva2:1362921
Note

QC 20191022

Available from: 2019-10-22 Created: 2019-10-22 Last updated: 2019-10-22Bibliographically approved

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