Search for decay of 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Teの崩壊の探索

Xiao, Y.*; Go, S.*; Grzywacz, R.*; Orlandi, R.   ; Andreyev, A. N.; 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.*; Lguillon, 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. N.; Asai, Masato; Bentley, M. A.*; de Angelis, G.*; Gross, C. J.*; Hausladen, P.*; Hirose, Kentaro; Hofmann, S.*; Ikezoe, Hiroshi*; Jenkins, D. G.*; Kindler, B.*; Lguillon, 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 decay of N=Z nuclei Te and 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 Perovskite) 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 Ni+Fe Xe were separated by the JAEA Recoil Mass Separator (RMS) and implanted into the YAP:Ce crystal. decays of neutron-deficient tellurium isotopes were identified and proton-emission of I was observed. No conclusive evidence was found for the decay chain XeTe Sn within 3 days experiment. The cross section limit of 130 pb was obtained for production of two events of Xe, about an order of magnitude below the expectation based on earlier cross section measurements and HIVAP calculations.