期刊
PHYSICAL REVIEW LETTERS
卷 123, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.212501
关键词
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资金
- JSPS KAKENHI [16H02179]
- MEXT KAKENHI [24105005, 18H05404]
- U.S. National Science Foundation [PHY-1565546]
- Grants-in-Aid for Scientific Research [18H05404, 16H02179, 24105005] Funding Source: KAKEN
A search for the heaviest isotopes of fluorine, neon, and sodium was conducted by fragmentation of an intense Ca-48 beam at 345 MeV/nucleon with a 20-mm-thick beryllium target and identification of isotopes in the large-acceptance separator BigRIPS at the RIKEN Radioactive Isotope Beam Factory. No events were observed for F-32,F-33,Ne- 35,Ne-36, and Na-38 and only one event for Na-39 after extensive running. Comparison with predicted yields excludes the existence of bound states of these unobserved isotopes with high confidence levels. The present work indicates that F-31 and Ne-34 are the heaviest bound isotopes of fluorine and neon, respectively. The neutron dripline has thus been experimentally confirmed up to neon for the first time since O-24 was confirmed to be the dripline nucleus nearly 20 years ago. These data provide new keys to understanding the nuclear stability at extremely neutron-rich conditions.
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