β-delayed proton decays near the proton drip line.

In order to improve the measuring efficiency, a “proton-gamma” coincidence technique in combination with a He-jet tape transport system was proposed and employed to identify the β-delayed proton precursors. The study of β-delayed proton decays near the proton drip line by using the “proton-gamma” coincidence technique over the last 5 years at the Institute of Modern Physics, Lanzhou, China, was summarized. New β-delayed proton precursors [sup 121]Ce, [sup 125]Nd, [sup 128]Pm, [sup 129]Sm, [sup 135]Gd, [sup 137]Gd, [sup 139]Dy, [sup 142]Ho, and [sup 149]Yb in the rare-earth region along a speculated proton drip line were synthesized and identified for the first time. The β-delayed proton decays of [sup 81]Zr, [sup 85]Mo, [sup 89]Ru, and [sup 93]Pd in T[sub z]=1/2 series as well as [sup 92]Rh in T[sub z]=1 series were observed. © 2002 American Institute of Physics. [ABSTRACT FROM AUTHOR]