Candidates for two-phonon octupole excitations in208Pb

Following the identification of the lowest-spin member of the two-phonon octupole quartet in ${}^{208}\mathrm{Pb},$ the additional members of the multiplet have been sought with the ${(n,n}^{\prime }\gamma )$ reaction. Based on energy arguments and $E1\mathrm{}$ transition probabilities determined from Doppler-shift lifetime measurements, the 5286- and 5216-keV states are suggested as candidates for the $2^{+}$ and $4^{+}$ two-phonon octupole excitations in ${}^{208}\mathrm{Pb}.$ The difficulties of identifying the $6^{+}$ member of this quartet are examined.