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Decay properties of new isotopes $$^{234}$$Bk and $$^{230}$$Am, and even-even nuclides $$^{234}$$Cm and $$^{230}$$Pu

新同位体$$^{234}$$Bk, $$^{230}$$Am及び偶偶核の同位体$$^{234}$$Cm, $$^{230}$$Puの崩壊特性

加治 大哉*; 森本 幸司*; 羽場 宏光*; 井手口 栄治*; 小浦 寛之 ; 森田 浩介*

Kaji, Daiya*; Morimoto, Koji*; Haba, Hiromitsu*; Ideguchi, Eiji*; Koura, Hiroyuki; Morita, Kosuke*

$$^{197}$$Au($$^{40}$$Ar, 3n)反応を用い、バークリウムの中性子欠損同位体である$$^{234}$$Bkの合成およびその崩壊生成同位体である$$^{230}$$Amの同定に初めて成功した。$$^{234}$$Bkの$$alpha$$崩壊エネルギーを7.62から7.96MeVの範囲で11事象観測し、うちこの$$alpha$$崩壊事象に続く6事象の核分裂を観測した。観測データより$$^{234}$$Bkおよび$$^{230}$$Amの半減期はそれぞれ19$$^{+6}_{-4}$$秒および32$$^{+22}_{-9}$$秒となった。また$$^{234}$$Bkからの$$beta$$崩壊娘核である$$^{234}$$Cmも同定した。

A neutron deficient berkelium isotope of $$^{234}$$Bk produced via the $$^{197}$$Au($$^{40}$$Ar, 3n) reaction and the daughter product of $$^{230}$$Am were newly identified. Alpha-decay energies of eleven $$^{234}$$Bk were found in 7.62 - 7.96 MeV, and six fission events correlated with $$alpha$$-decay of $$^{234}$$Bk were observed. The half-lives of $$^{234}$$Bk and $$^{230}$$Am were determined to be 19$$^{+6}_{-4}$$ s and 32$$^{+22}_{-9}$$ s, respectively. The $$^{234}$$Cm followed by $$beta$$-decay of $$^{234}$$Bk was also identified.

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パーセンタイル:29.51

分野:Physics, Multidisciplinary

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