Search for super-allowed alpha decay around ¹⁰⁰Sn region

The enhancement of alpha-decay probability for nuclei above ¹⁰⁰Sn is expected since valence protons and neutrons above Z=N=50 occupy the same single-particle orbitals. The program to search for new alpha emitters in this region was initiated at JAEA Tandem Laboratory at Tokai, Japan. 

To detect an alpha decay chain from ¹¹²Ba->¹⁰⁸Xe->¹⁰⁴Te->¹⁰⁰Sn, we developed a new implantation detector system. The detector combines the capability for the spacial recoil-decay correlations typically implemented with use of the Double sided Silicon Strip Detector, but is able to provide a very rapid response time due to used fo the fast scintillator. Proof of principle measurement was performed at the Recoil Mass Separator at JAEA Tandem accelerator. The performance of the detector and future plan to search for the alpha decay chain will be presented.