First online multireflection time-of-flight mass measurements of isobar chains produced by fusion-evaporation reactions; Toward identification of superheavy elements via mass spectroscopy
Schury, P.*; Wada, Michiharu*; Ito, Yuta*; Kaji, Daiya*; Arai, Fumiya*; MacCormick, M.*; Murray, I.*; Haba, Hiromitsu*; Jeong, S.*; Kimura, Sota*; Koura, Hiroyuki
; Miyatake, Hiroari*; Morimoto, Koji*; Morita, Kosuke*; Osawa, Akira*; Rosenbusch, M.*; Reponen, M.*; S
derstr
m, P.-A.*; Takamine, Aiko*; Tanaka, Taiki*; Wollnik, H.*
Using a multireflection time-of-flight mass spectrograph located after a gas cell coupled with the gas-filled recoil ion separator GARIS-II, the masses of several
-decaying heavy nuclei were directly and precisely measured. The nuclei were produced via fusion-evaporation reactions and separated from projectilelike and targetlike particles using GARIS-II before being stopped in a helium-filled gas cell. Time-of-flight spectra for three isobar chains,
Fr-
Rn-
At-
Po,
Fr-
Rn-
At-
Po-
Bi, and
Fr-
Rn-
At, were observed. Precision atomic mass values were determined for
Fr,
Rn, and
At. Identifications of
Bi,
Po,
Rn, and
At were made with N
10 detected ions, representing the next step toward use of mass spectrometry to identify exceedingly low-yield species such as superheavy element ions.