The neutron array of the compact spectrometer for heavy ion experiments in Fermi energy region

Abstract

The emission of neutrons from heavy ion reactions is an important observable for studying the asymmetric nuclear equation of state and the reaction dynamics. A 20-unit neutron array has been developed and mounted on the compact spectrometer for heavy ion experiments (CSHINE) to measure the neutron spectra, neutron-neutron and neutron-proton correlation functions. Each unit consists of a $15\times 15\times 15\mathrm{c}{\mathrm{m}}^3$ plastic scintillator coupled to a $\varphi =52\mathrm{mm}$ photomultiplier. The Geant4 simulation with optical process is performed to investigate the time resolution and the neutron detection efficiency. The inherent time resolution of 212 ps is obtained by cosmic ray coincidence test. The n-$\gamma$ discrimination and time-of-flight performance are given by ${}^{252}\mathrm{Cf}$ radioactive source test and beam test. The neutron energy spectra have been obtained in the angle range $30^{\circ }\le {\theta }_{\mathrm{lab}}\le 51^{\circ }$ in the beam experiment of ${}^{124}$Sn+${}^{124}$Sn at 25 MeV/u with CSHINE.

8 pages, 11 figures

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Cited by in corpus (4)

• Extract neutron-neutron interaction strength and spatial-temporal dynamics of neutron emission from two-particle correlation function
• Precise Measurement of Short-Range Correlations in Nuclei from Bremsstrahlung Gamma Ray Emission in Low-Energy Heavy-Ion Collisions
• Linear Response of CsI(Tl) Crystal to Energetic Photons below 20 MeV
• Experimental Study of Bremsstrahlung Gamma Ray Emission and Short-Range Correlations in ${}^{124}$Sn+${}^{124}$Sn Collisions at 25 MeV/u