The neutron-rich isotope Pr-154, the heaviest isotope of praseodymium,
has been investigated by gamma-ray multispectrum scaling and gamma-ga
mma-(t), X-gamma-(t) coincidence exper iments. The isotope Pr-154 was
separated from U-235 fission products with the on-line isotope separat
or KUR-ISOL. The decay scheme of Pr-154 has been constructed consistin
g of 9 excited states and 12 transitions in Nd-154, including 7 excite
d states newly found in the present experiment.