Abstract
The construction of the portable spectrometer, MULTI, is designed for the measurement of β-γ-neutron coincidences on beams of radioactive exotic nuclei. It will be used in measurements of the β-decay process of neutron-rich nuclei with large Qβ values accessible in radioactive beams facilities. The experimental technique includes the measurement of the ratios between gamma-ray emission and multi-neutron emission, following beta-decay of radioactive nuclei implanted into an active target. The construction of a gamma-ray spectrometer based on high-volume CeBr3+NaI(Tl) phoswich scintillation detectors is introduced. Results of the measurements of its fundamental characteristics – total detection efficiency, peak efficiency and Compton suppression effect with a 60Co source are presented. Design of the neutron counter array, consisting of 40 proportional counters filled with 3He gas, was optimized with Monte Carlo simulations. Results were validated with a 252Cf spectroscopic source, leading to expected detection efficiency of ∼35% for neutrons with energy < 1MeV. Further development plans are discussed.
Highlights
THE MULTI spectrometer was developed as a setup for measurement of the total reaction cross section with radioactive beams [1]
Fundamental properties of the spectrometer, important for the evaluation of results, include detection efficiency of the gamma-ray spectrometer and registration efficiency for nuclear reaction events as a function of gamma-ray energy and multiplicity were earlier evaluated by Monte Carlo simulations in Geant3 [1] and later Geant4 [4]
The MULTI spectrometer is designed for measurement of βγ-neutron coincidences from the decay of exotic nuclei implanted into and active target
Summary
THE MULTI spectrometer was developed as a setup for measurement of the total reaction cross section with radioactive beams [1]. Possibilities of upgrading the MULTI spectrometer with novel high-resolution detectors were analyzed by Monte Carlo method, aimed to improve detection and registration efficiency with possible gamma-ray spectroscopy measurements for identification of the reaction channels [10]. We will follow in search of properties of weakly bound neutrons in the region of light neutron-rich nuclei, accessible on the ACCULINNA-2 fragment separator For this purpose, the correctness of Monte Carlo simulations must be verified with measurements. This work is dedicated to the measurement of fundamental properties of gamma-ray spectrometer and validation of the Geant model of the setup for gamma-rays and neutrons It will help with optimization of the spectrometer geometry for measurements on secondary beams of different facilities as well as with development of the 4π β-detector
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