Journal
PHYSICAL REVIEW LETTERS
Volume 124, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.222504
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Funding
- NSERC Canada
- JSPS KAKENHI [16H02179, 18H05404]
- UK STFC [ST/P003885/1]
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC02-05CH11231]
- Office of Nuclear Physics, U.S. Department of Energy [DE-SC0018223, DE-FG0296ER40963]
- Office of Science of the Department of Energy [DE-AC05-00OR22725]
- Oak Ridge National Laboratory (ORNL) [ERKBP72]
- JSPS invitational fellowship program
- Grants-in-Aid for Scientific Research [18H05404] Funding Source: KAKEN
- STFC [ST/P003885/1] Funding Source: UKRI
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We report the measurement of reaction cross sections (sigma(ex)(R)) of F-27,F-29 with a carbon target at RIKEN. The unexpectedly large sigma(ex)(R) and derived matter radius identify F-29 as the heaviest two-neutron Borromean halo to date. The halo is attributed to neutrons occupying the 2p(3/2) orbital, thereby vanishing the shell closure associated with the neutron number N = 20. The results are explained by state-of-the-art shell model calculations. Coupled-cluster computations based on effective field theories of the strong nuclear force describe the matter radius of F-27 but are challenged for F-29.
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