X. D. Liu

LASSA: a large area silicon strip array for isotopic identification of charged particles

Abstract A new high resolution, charged particle detector array, LASSA, has been developed. LASSA consists of nine individual telescopes that each utilizes a Si–Si–CsI(Tl) stack to provide isotopic identification of fragments (1⩽Z⩽8) with good angular resolution over a wide dynamic range in energy. The energy range covered is E/A=2.4– 140 MeV for protons and E/A=4.8– 335 MeV for 16O ions. The front portion of each telescope is comprised of a 65 μm Si(IP) strip detector backed by a 500 μm Si(IP) strip detector. This second detector provides position information in two dimensions. Behind the second silicon detector is a cluster of four 6 cm thick CsI(Tl) crystals, each read-out by a photodiode. The design, construction, and performance characteristics of this detector telescope are described.

Energy resolution and energy}light response of CsI(Tl) scintillators for charged particle detection

This article describes the crystal selection and quality control utilized to develop and calibrate a high-resolution array of CsI(Tl) scintillator crystals for the detection of energetic charged particles. Alpha sources are used to test the light output variation due to thallium doping gradients. Selection of crystals with better than 1% non-uniformity in light output is accomplished using this method. Tests with a 240 MeV alpha beam reveal that local light output variations within each of the tested CsI(Tl) crystals limit the resolution to about 0.5%. Charge and mass dependences in the energy}light output relationship are determined by calibrating with energetic projectile fragmentation beams. ( 2001 Elsevier Science B.V. All rights reserved.

Isospin diffusion observables in heavy-ion reactions

Collisions of {sup 112}Sn and {sup 124}Sn nuclei, which differ in their isospin asymmetry, provide information about the rate of isospin diffusion and equilibration. Although several different probes can provide accurate diffusion measurements, the ratios of the mirror nuclei may be the simplest and most promising one. Ratios of the mass seven mirror nuclei yields are analyzed to show the rapidity, transverse momentum, and impact parameter dependence of isospin diffusion.

Fragment production in noncentral collisions of intermediate-energy heavy ions

The defining characteristics of fragment emission resulting from the non-central collision of 114Cd ions with 92Mo target nuclei at E/A = 50 MeV are presented. Charge correlations and average relative velocities for mid-velocity fragment emission exhibit significant differences when compared to standard statistical decay. These differences associated with similar velocity dissipation are indicative of the influence of the entrance channel dynamics on the fragment production process.

Systematic extraction of spectroscopic factors from C 12 ( d , p ) C 13 and C 13 ( p , d ) C 12 reactions

Existing measurements of the angular distributions of the ground-state to ground-state transitions of the

Isotope yields from central Sn-112, Sn-124 + Sn-112, Sn-124 collisions, dynamical emission?

^{12}\mathrm{C}(d,p)^{13}\mathrm{C}

Isospin observables from fragment energy spectra

and

Comparison of canonical and grand canonical models for selected multifragmentation data

^{13}\mathrm{C}(p,d)^{12}\mathrm{C}

Isotope yields from central 112,124Sn+112,124Sn collisions: Dynamical emission?

neutron-transfer reactions have been analyzed systematically using the Johnson-Soper adiabatic and distorted-wave theories. When using a consistent set of physical inputs the deduced spectroscopic factors are consistent to within

Excitation and decay of projectilelike fragments formed in dissipative peripheral collisions at intermediate energies

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