Abstract
A new segmented plastic scintillator detector Tuike has been developed for recoil-beta tagging experiments at the Accelerator Laboratory of the University of Jyväskylä. The detector consists of individual plastic scintillator bars arranged in two orthogonal layers, and the scintillation light is detected using silicon photomultipliers. Performance of the new detector was tested using fusion-evaporation reaction 40Ca(36Ar, pn)74Rb, and the results are discussed here. It was found that for beta particles seen in the main silicon detector, Tuike can tag high-energy beta particles with a 48(10)% efficiency. An energy calibration method using Compton edges of gamma ray transitions is described in the present work. Tuike was demonstrated to improve the sensitivity to identify weak fusion-evaporation channels associated with beta decays having high beta end-point energy, enabling nuclear structure studies along the N = Z line.
Highlights
Experimental studies of exotic nuclei, such as those residing near the proton drip-line, starts with creation of those nuclei utilizing a particle accelerator
Specific nucleus of interest can be identified based on its decay properties, and this procedure is called the recoil-decay tagging (RDT) method [2,3]
We present a new segmented plastic scintillator detector to detect the full energy of a beta particle originating from a decaying recoil nucleus
Summary
Experimental studies of exotic nuclei, such as those residing near the proton drip-line, starts with creation of those nuclei utilizing a particle accelerator. Fermi superallowed beta decays have high beta decay end-point energies up to 10 MeV and relatively fast ground state decay half lives of the order of 100 ms With these characteristics it is possible to employ the beta particles as a decay tag and distinguish the reaction products. We present a new segmented plastic scintillator detector to detect the full energy of a beta particle originating from a decaying recoil nucleus. We have named this detector as Tuike from the Finnish word for scintillation. A plastic scintillator based phoswich detector was developed for beta-tagging purposes [10] The latter detector had a cleaner beta selection, since it could better distinguish between different types of ionizing radiation based on pulse shape discrimination. We briefly discuss about the present status and future development plans of Tuike
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