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Search for $$alpha$$ decay of $$^{104}$$Te with a novel recoil-decay scintillation detector

新しいシンチレーション検出器を用いた$$^{104}$$Teの$$alpha$$崩壊の探索

Xiao, Y.*; Go, S.*; Grzywacz, R.*; Orlandi, R.; Andreyev, A.; 浅井 雅人; Bentley, M. A.*; de Angelis, G.*; Gross, C. J.*; Hausladen, P.*; 廣瀬 健太郎; Hofmann, S.*; 池添 博*; Jenkins, D. G.*; Kindler, B.*; L$'e$guillon, R.; Lommel, B.*; 牧井 宏之; Mazzocchi, C.*; 西尾 勝久; Parkhurst, P.*; Paulauskas, S. V.*; Petrache, C. M.*; Rykaczewski, K. P.*; 佐藤 哲也; Smallcombe, J.; 豊嶋 厚史; 塚田 和明; Vaigneur, K.*; Wadsworth, R.*

Xiao, Y.*; Go, S.*; Grzywacz, R.*; Orlandi, R.; Andreyev, A.; Asai, Masato; Bentley, M. A.*; de Angelis, G.*; Gross, C. J.*; Hausladen, P.*; Hirose, Kentaro; Hofmann, S.*; Ikezoe, Hiroshi*; Jenkins, D. G.*; Kindler, B.*; L$'e$guillon, R.; Lommel, B.*; Makii, Hiroyuki; Mazzocchi, C.*; Nishio, Katsuhisa; Parkhurst, P.*; Paulauskas, S. V.*; Petrache, C. M.*; Rykaczewski, K. P.*; Sato, Tetsuya; Smallcombe, J.; Toyoshima, Atsushi; Tsukada, Kazuaki; Vaigneur, K.*; Wadsworth, R.*

A search for super-allowed $$alpha$$ decay of N=Z nuclei $$^{104}$$Te and $$^{108}$$Xe was carried out using a novel recoil-decay scintillator detector at the tandem accelerator facility at Japan Atomic Energy Agency. Inorganic crystal scintillation material of YAP:Ce (Yttrium Aluminium Perowskite) coupled to position-sensitive photo-multiplier tube (PSPMT) was implemented for the first time in a radioactive decay experiment. Residues from the fusion-evaporation reaction $$^{58}$$Ni+$$^{54}$$Fe$$rightarrow$$ $$^{112}$$Xe$$^*$$ were separated by the JAEA Recoil Mass Separator (RMS) and implanted into the YAP:Ce crystal. $$alpha$$ decays of neutron-deficient tellurium isotopes were identified and proton-emission of $$^{109}$$I was observed. No conclusive evidence was found for the decay chain $$^{108}$$Xe$$rightarrow$$$$^{104}$$Te$$rightarrow$$ $$^{100}$$Sn within 3 days experiment. The cross section limit of 130 pb was obtained for production of two events of $$^{108}$$Xe, about an order of magnitude below the expectation based on earlier cross section measurements and HIVAP calculations.

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