Location of the Neutron Dripline at Fluorine and Neon

被引：136

作者：

Ahn, D. S. ^{[1
]}

Fukuda, N. ^{[1
]}

Geissel, H. ^{[5
]}

Inabe, N. ^{[1
]}

Iwasa, N. ^{[4
]}

Kubo, T. ^{[1
,7
]}

Kusaka, K. ^{[1
]}

Morrissey, D. J. ^{[5
]}

Murai, D. ^{[3
]}

Nakamura, T. ^{[2
]}

Ohtake, M. ^{[1
]}

Otsu, H. ^{[1
]}

Sato, H. ^{[1
]}

Sherrill, B. M. ^{[6
]}

Shimizu, Y. ^{[1
]}

Suzuki, H. ^{[1
]}

Takeda, H. ^{[1
]}

Tarasov, O. B. ^{[6
]}

Ueno, H. ^{[1
]}

Yanagisawa, Y. ^{[1
]}

Yoshida, K. ^{[1
]}

机构：

[1] RIKEN, Nishina Ctr Accelerator Based Sci, 2-1 Hirosawa, Wako, Saitama 3510198, Japan

[2] Tokyo Inst Technol, Dept Phys, Meguro Ku, 2-12-1 O Okayama, Tokyo 1528551, Japan

[3] Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan

[4] Tohoku Univ, Dept Phys, Aoba Ku, 6-3 Aramaki Aza Aoba, Sendai, Miyagi 9808578, Japan

[5] Helmholtzzentrum Schwerionenforsch GmbH, GSI, Planckstr 1, D-64291 Darmstadt, Germany

[6] Michigan State Univ, Natl Superconducting Cyclotron Lab, 640 South Shaw Lane, E Lansing, MI 48824 USA

[7] Michigan State Univ, Facil Rare Isotope Beams, 640 South Shaw Lane, E Lansing, MI 48824 USA

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 21期

基金：

美国国家科学基金会;

关键词：

BIGRIPS SEPARATOR; RIKEN; ISOTOPES; FRAGMENTATION; NUCLEI; SEARCH;

D O I：

10.1103/PhysRevLett.123.212501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：6

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