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Fine structure in the $$alpha$$ decay of $$^{218}$$At

$$^{218}$$Atの$$alpha$$崩壊の微細構造

Cubiss, J. G.*; Andreyev, A. N.; Barzakh, A. E.*; Andel, B.*; Antalic, S.*; Cocolios, T. E.*; Day Goodacre, T.*; Fedorov, D. V.*; Fedosseev, V. N.*; Ferrer, R.*; Fink, D. A.*; Gaffney, L. P.*; Ghys, L.*; Huyse, M.*; Kalaninov$'a$, Z.*; K$"o$ster, U.*; Marsh, B. A.*; Molkanov, P. L.*; Rossel, R. E.*; Rothe, S.*; Seliverstov, M. D.*; Sels, S.*; Sj$'o$din, A. M.*; Stryjczyk, M.*; Truesdale, V. L.*; Van Beveren, C.*; Van Duppen, P.*; Wilson, G. L.*

Cubiss, J. G.*; Andreyev, A. N.; Barzakh, A. E.*; Andel, B.*; Antalic, S.*; Cocolios, T. E.*; Day Goodacre, T.*; Fedorov, D. V.*; Fedosseev, V. N.*; Ferrer, R.*; Fink, D. A.*; Gaffney, L. P.*; Ghys, L.*; Huyse, M.*; Kalaninov$'a$, Z.*; K$"o$ster, U.*; Marsh, B. A.*; Molkanov, P. L.*; Rossel, R. E.*; Rothe, S.*; Seliverstov, M. D.*; Sels, S.*; Sj$'o$din, A. M.*; Stryjczyk, M.*; Truesdale, V. L.*; Van Beveren, C.*; Van Duppen, P.*; Wilson, G. L.*

$$^{218}$$Atの$$alpha$$崩壊について、CERN-ISOLDE施設においてレーザーイオン化法を使うことで研究した。$$alpha$$-$$gamma$$同時計数データを初めて取得し、より精度の良い半減期の値として1.27(6)秒を得た。$$alpha$$崩壊の微細構造を基に新しい$$alpha$$崩壊図式を構築した。それらの結果から、$$^{218}$$Atの基底状態のスピン・パリティは(3$$^{-}$$)がより確からしいことが解ったが、(2)$$^{-}$$の可能性も完全には否定しきれない。

An $$alpha$$ decay of $$^{218}$$At was studied at the CERN-ISOLDE facility using a laser-ionization technique. Coincidence $$alpha$$-$$gamma$$ data were collected for the first time and a more precise half-life value of T$$_{1/2}$$ = 1.27(6) s was measured. A new $$alpha$$-decay scheme was deduced based on the fine-structure of the $$alpha$$ decay. The results lead to a preferred spin and parity assignment of J$$_{pi}$$ = (3$$^{-}$$) for the ground state of $$^{218}$$At; however, J$$_{pi}$$ = (2)$$^{-}$$ cannot be fully excluded.

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パーセンタイル:27.46

分野:Physics, Nuclear

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