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Ahn, D S; Fukuda, N; Geissel, H; Inabe, N; Iwasa, N; Kubo, T; Kusaka, K; Morrissey, D J; Murai, D; Nakamura, T; Ohtake, M; Otsu, H; Sato, H; Sherrill, B M; Shimizu, Y; Suzuki, H; Takeda, H; Tarasov, O B; Ueno, H; Yanagisawa, Y; Yoshida, K
Physical review letters, 2019-Nov-22, Letnik: 123, Številka: 21Journal Article
A search for the heaviest isotopes of fluorine, neon, and sodium was conducted by fragmentation of an intense ^{48}Ca 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 ^{32,33}F, ^{35,36}Ne, and ^{38}Na and only one event for ^{39}Na 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 ^{31}F and ^{34}Ne 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 ^{24}O 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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