Abstract
A new ancillary detector, SPICE (SPectrometer for Internal Conversion Electrons) has been constructed and recently commissioned for use with radioactive ion beams at the TRIUMF-ISAC II facility. SPICE is designed to be operated in conjunction with the TIGRESS High-Purity Germanium (HPGe) spectrometer to perform combined in-beam γ -ray and internal-conversion-electron spectroscopy. The main feature of SPICE is high effciency over a wide range of electron energies from 100 to 3500 keV, with an effective reduction of beam-induced backgrounds. SPICE will be a powerful tool to measure conversion coeffcients and E0 transitions in atomic nuclei. A recent in-beam commissioning experiment demonstrates the effectiveness of the basic design concept of SPICE in background suppression.
Highlights
In spherical nuclei, near closed shells, many excitations can be well explained by single-particle excitations in the microscopic picture of the nuclear shell model [1]
The transition of nuclear structure between these two regimes occurs gradually with the addition of many valance nucleons, but in some special cases this transition is observed to occur with the addition of just a couple of pairs of valence nucleons
A key area of research is to understand the microscopic mechanisms responsible for the onset of deformation, and to understand the interplay between collective and singleparticle excitations in deformed nuclei. This is true when trying to explain the structure of nuclei identified as displaying shape coexistence at low excitation energy [3]
Summary
Near closed shells, many excitations can be well explained by single-particle excitations in the microscopic picture of the nuclear shell model [1]. A key area of research is to understand the microscopic mechanisms responsible for the onset of deformation, and to understand the interplay between collective and singleparticle excitations in deformed nuclei. This is true when trying to explain the structure of nuclei identified as displaying shape coexistence at low excitation energy [3]. The spectrometer will be used to measure electric monopole transitions in exotic nuclei. Ρ2(E0), are crucial observables in the interpretation of nuclear structure. SPICE will enable the identification of excited 0+ states in exotic nuclei and the determination of ρ2(E0) values, which will help develop our understanding of shape coexistence away from the line of stability
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
