Speaker
Description
For three decades, the ISOLTRAP experiment at ISOLDE/CERN has performed high-precision mass measurements of short-lived nuclides using the time-of-flight ion-cyclotron-resonance (ToF-ICR) detection method, which is reaching its limits for accessible half-lives and relative uncertainties. With the new phase-imaging ion-cyclotron-resonance (PI-ICR) [S. Eliseev et al., Phys. Rev. Lett. 110, 082501 (2013)] detection technique, experiments can be performed with fewer ions and higher resolving power, providing access to new areas of the nuclear chart. This poster will present the ion-optical and data-acquisition improvements required for the implementation of the PI-ICR detection technique at ISOLTRAP, as well as results from first on-line measurements in both the high-precision and high-resolution regimes. During a systematic on-line-study the $Q$-value of the $^{88}$Sr-$^{88}$Rb beta-decay was determined as a validation of the successful implementation of the PI-ICR detection technique with ISOLTRAP. Furthermore, the new detection technique allowed spatial separation of the close-lying isomeric states in $^{127}$Cd and $^{129}$Cd from which their excitation energy was derived. A mass resolving power $\frac{m}{\Delta m} > 10^6$ was reached in both cases for only 200 ms phase-accumulation time.
