B. Heusch

Study of n-γ discrimination with NE213 and BC501A liquid scintillators of different size

Abstract A comparative study of n-γ discrimination by the digital charge comparison method was carried out for NE213 and BC501A scintillators of different size coupled to a 130 mm diameter XP4512B photomultiplier. Particularly, the scintillators of diameter 50 mm × 50 mm size are compared with those of 4 l volume (160 mm in diameter and 200 mm in depth). The figure of merit, M , of 3.81 measured with the diameter 50 mm × 50 mm BC501A scintillator at 1 MeV energy lost by recoil electrons, is much better than M of 2.05 as observed with the 4 l volume cell. This is the effect of the reduced photoelectron yield by about 50% determined for the 4 l volume scintillator. Moreover, the slowing down of the light pulse and multiscattering of neutrons have a further influence on the lowering of the M factor. The study of the M factor versus the initial delay and width of the gate set at the slow component showed that the early light of the slow component represented often by the intermediate component with the decay time constant of about 30 ns is of great importance for the n-γ discrimination. Particularly, for the 4 l volume cells it is sufficient to limit the width of the gate at the slow component to about 300 ns. The comparison of the NE213 and BC501A scintillators showed that the BC501A scintillator exhibits a larger light yield evidently observed for the 4 l volume cell and thus giving a better n-γ discrimination.

Two-neutron interferometry as a probe of the nuclear halo

The technique of intensity interferometry is proposed as a probe of the spatial configuration of two-Neutron haloes. After exploring the sensitivity of interferometry to the n-N configuration, it is demonstrated that the application of the standard method for constructing the correlation function is not valid for halo neutrons. A new iterative method is presented and applied to measurements of the dissociation of 6He, 11Li and 14Be. The correlation functions for these systems have thus been extracted for the first time and the corresponding root-Mean-Square n-n separations estimated. The results are in agreement with the predictions of available three-Body models

Three-body correlations in Borromean halo nuclei

Three-body correlations in the dissociation of Borromean halo nuclei are explored for the first time using a technique based on intensity interferometry and Dalitz plots. As an example, the breakup of

The light yield response of NE213 organic scintillators to charged particles resulting from neutron interactions

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Study of n-γ discrimination by digital charge comparison method for a large volume liquid scintillator

Be into

Identification of Different Reaction Channels of High-energy Neutrons in Liquid Scintillators By the Pulse-shape Discrimination Method

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Comparative study of new 130 mm diameter fast photomultipliers for neutron detectors

Be+n+n by Pb and C targets is analysed. The combined treatment of n-n and core-n correlations permitted the halo n-n separation to be deduced together with the characteristics

Study of the excitation energy sharing and dynamics using the neutron detector DéMoN in 86Kr + 165Ho collisions at 60 A MeV

(E,tau)

Highest temperatures sustainable in heavy nuclei produced in Ar+Au collisions at 60 AMeV

of resonances formed in

Vivitron 1995 Transient voltage simulation, high voltage insulator tests, electric field calculation

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