Ground state proton radioactivity from 121Pr: when was this exotic nuclear decay mode first discovered?
Ground-state proton radioactivity has been identified from 121Pr. A transition with a proton energy of E(p)=882(10) keV [Q(p)=900(10) keV] and half-life t(1/2)=10(+6)(-3) ms has been observed and is assigned to the decay of a highly prolate deformed 3/2(+) or 3/2(-) Nilsson state. The present result is found to be incompatible with a previously reported observation of ground-state proton radioactivity from 121Pr, which would have represented the discovery of this phenomenon.
Robinson
A P
AP
School of Physics, The University of Edinburgh, Edinburgh EH9 3JZ, Scotland, UK.
Woods
P J
PJ
Seweryniak
D
D
Davids
C N
CN
Carpenter
M P
MP
Hecht
A A
AA
Peterson
D
D
Sinha
S
S
Walters
W B
WB
Zhu
S
S