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全吸収検出器を用いた長寿命$$^{162,165}$$Gd核異性体の寿命測定

Lifetime measurements of long-lived isomers in $$^{162,165}$$Gd using a total absorption detector

浅井 雅人; 林 裕晃*; 長 明彦; 佐藤 哲也; 乙川 義憲; 長江 大輔; 塚田 和明; 宮下 裕次*; 大内 裕之*; 泉 さやか*; 篠塚 勉*

Asai, Masato; Hayashi, Hiroaki*; Osa, Akihiko; Sato, Tetsuya; Otokawa, Yoshinori; Nagae, Daisuke; Tsukada, Kazuaki; Miyashita, Yuji*; Ouchi, Hiroyuki*; Izumi, Sayaka*; Shinozuka, Tsutomu*

$$beta$$崩壊で励起される長寿命核異性体の半減期を、全吸収検出器を用いて測定する方法を新たに開発し、$$^{162}$$Gd及び$$^{165}$$GdのKアイソマーの半減期を初めて決定した。原子力機構タンデム加速器に設置されたオンライン同位体分離装置ISOLを用いて、短寿命中性子過剰核$$^{162}$$Eu及び$$^{165}$$Euを合成・分離し、$$^{162,165}$$Euの$$beta$$崩壊で放出される$$beta$$線や$$gamma$$線を全吸収測定した。検出された事象ごとに時間情報を付加して記録することで、100$$mu$$秒以上の寿命を持つ核異性体の寿命測定を可能にした。

We have developed a new method to measure lifetime of long-lived isomers populated through the $$beta$$ decay, using a total absorption detector. Using this method, we have determined lifetime of the K isomers in $$^{162}$$Gd and $$^{165}$$Gd for the first time. The short-lived neutron-rich nuclei $$^{162}$$Eu and $$^{165}$$Eu were produced and mass-separated by the on-line isotope separator (ISOL) at JAEA tandem accelerator facility. Beta- and $$gamma$$ rays emitted by the $$beta$$ decay of $$^{162,165}$$Eu were total-absorbed by the detector, and all the events were recorded with time stamps. This method enabled us to determine lifetime of the isomers with more than 100-$$mu$$s lifetime.

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