学術雑誌論文 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, M.  ,  Ito, Y.  ,  Kaji, D.  ,  Arai, F.  ,  MacCormick, M.  ,  Murray, I.  ,  Haba, H.  ,  Jeong, S.  ,  Kimura, S.  ,  Koura, H.  ,  Miyatake, H.  ,  Morimoto, K.  ,  Morita, K.  ,  Ozawa, A.  ,  Rosenbusch, M.  ,  Reponen, M.  ,  Söderström, P.-A.  ,  Takamine, A.  ,  Tanaka, T.  ,  Wollnik, H.

95 ( 1 )  , p.011305 , 2017-01 , American Physical Society
ISSN:2469-9985
NII書誌ID(NCID):AA00773613
内容記述
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 α-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, 204Fr−204Rn−204At−204Po, 205Fr−205Rn−205At−205Po−205Bi, and 206Fr−206Rn−206At, were observed. Precision atomic mass values were determined for 204–206Fr, 204,205Rn, and 204,205At. Identifications of 205Bi, 204,205Po, 206Rn, and 206At 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.
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