期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.222501
关键词
-
资金
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC02-05CH11231, DE-AC02-06CH11357, DE-AC52-07NA27344]
- U.S. Department of Energy, Office of Science
An experiment was performed at Lawrence Berkeley National Laboratory's 88-in. Cyclotron to determine the mass number of a superheavy element. The measurement resulted in the observation of two alpha-decay chains, produced via the Am-243(Ca-48,xn)(291-x)Mc reaction, that were separated by mass-to-charge ratio (A/q) and identified by the combined BGS + FIONA apparatus. One event occurred at A/q = 284 and was assigned to (284)Nh (Z = 113), the alpha-decay daughter of (288)Mc (Z = 115), while the second occurred at A/q = 288 and was assigned to (288)Mc. This experiment represents the first direct measurements of the mass numbers of superheavy elements, confirming previous (indirect) mass-number assignments.
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