Solenogam: A new detector array for γ-ray and conversion-electron spectroscopy of long-lived states in fusion-evaporation products

Abstract

A new detector array, Solenogam, has been developed at the Australian National University Heavy Ion Accelerator Facility. Coupled initially to the SOLITAIRE 6.5 T, gas-filled, solenoidal separator, and later to an 8 T solenoid, the system enables the study of long-lived nuclear states through γ-ray and conversion-electron spectroscopy in a low-background environment. The detector system is described and results from the commissioning experiments are presented.

Gamma-ray and conversion-electron spectroscopy of the high-spin isomer in 145Sm

“…After implantation in a catcher tape at the focal point of the Solenogam array, γ rays and electrons were detected using five Ortec Gamma-X HPGe detectors (four with Compton suppression), one Ortec LEPS detector, and six Si(Li) detectors; see Refs. [14] and [15] for more complete descriptions of SOLITAIRE and Solenogam. Initial measurements were obtained at a beam energy of 110 MeV.…”

“…In the present work, the decay of the high-spin isomer in 145 Sm has been studied using the Solenogam array [14]. Solenogam is a system of γ-ray and electron detectors coupled to the recoil separator SOLITAIRE at the Australian National University Heavy-Ion Accelerator Facility (ANU-HIAF).…”

The Heavy Ion Accelerator Facility: Research Achievements and Aspirations

“…The solenoidal separators have proven to be extremely versatile instruments, with applications ranging from basic nuclear physics, through materials science, to light radioactive ion beam production (SOLEROO) [44]. SolenoGam is an array of electron and γ-ray detectors that can be placed in close geometry around the focal plane of the solenoid, hence enabling the spectroscopy of longlived weakly-populated states to be performed in a lowbackground environment [45].…”