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Spontaneous fission of neutron-deficient fermium isotopes and the new nucleus $$^{241}$$Fm

中性子欠損したフェルミウム元素の自発核分裂と新同位体$$^{241}$$Fm

Khuyagbaatar, J.*; Hofmann, S.*; He${ss}$berger, F. P.*; Ackermann, D.*; Burkhard, H. G.*; Heinz, S.*; Kindler, B.*; Kojouharov, I.*; Lommel, B.*; Mann, R.*; Maurer, J.*; 西尾 勝久; Novikov, Y.*

Khuyagbaatar, J.*; Hofmann, S.*; He${ss}$berger, F. P.*; Ackermann, D.*; Burkhard, H. G.*; Heinz, S.*; Kindler, B.*; Kojouharov, I.*; Lommel, B.*; Mann, R.*; Maurer, J.*; Nishio, Katsuhisa; Novikov, Y.*

Spontaneous fission of neutron-deficient fermium isotopes with neutron number N$$<$$144 was investigated. The nuclei were produced in fusion-evaporation reactions of $$^{40}$$Ar beams with $$^{204,206-208}$$Pb targets. The new isotope $$^{241}$$Fm was identified, and the half-life 0.73 ms was determined. The half-life was significantly longer than the neighboring even-even isotopes $$^{242,244}$$Fm, and the hindrance factor were calculated by the to be 1.1$$times$$10$$^{4}$$ for $$^{241}$$Fm and 5.2$$times$$10$$^{4}$$ for $$^{243}$$Fm, being associated with the lower tunneing probability for nuclei having nuclear spins. The result suggests also the possible production and detection of $$^{239,237}$$Fm becalsue of the stabilization against spontaneous fission.

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パーセンタイル:21.94

分野:Physics, Nuclear

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