The double Penning trap mass spectrometer JYFLTRAP has been employed to measure masses and excitation energies for $11/2^-$ isomers in $^{ 121}$Cd, $^{ 123}$Cd, $^{ 125}$Cd and $^{ 133}$Te, for $1/2^-$ isomers in $^{ 129}$In and $^{ 131}$In, and for $7^-$ isomers in $^{ 130}$Sn and $^{ 134}$Sb. These first direct mass measurements of the Cd and In isomers reveal deviations to the excitation energies based on results from beta-decay experiments and yield new information on neutron- and proton-hole states close to $^{ 132}$Sn. A new excitation energy of 144(4) keV has been determined for $^{ 123}$Cd$^m$. A good agreement with the precisely known excitation energies of $^{ 121}$Cd$^m$, $^{ 130}$Sn$^m$, and $^{ 134}$Sb$^m$ has been found.
Categories: nucl-ex