Excitation energy and angular momentum of quasiprojectiles produced in the Xe+Sn collisions at incident energies between 25 and 50 MeV/nucleon☆
TL;DR: In this paper, the excitation energy and angular momentum transferred to quasiprojectiles have been measured in the 129 Xe+ nat Sn collisions at bombarding energies between 25 and 50 MeV/nucleon.
About: This article is published in Nuclear Physics.The article was published on 2001-04-09 and is currently open access. It has received 29 citations till now. The article focuses on the topics: Angular momentum coupling & Total angular momentum quantum number.
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TL;DR: A review article as discussed by the authors focused on the tremendous progress realized during the last fifteen years in the understanding of multifragmentation and its relationship to the liquid-gas phase diagram of nuclei and nuclear matter.
137 citations
TL;DR: In this paper, a new thermometer based on fragment momentum fluctuations is presented, which exhibited residual contamination from the collective motion of the fragments along the beam axis, and a mass dependence was observed for this thermometer.
63 citations
TL;DR: In this article, a review article takes stock of the progress made in understanding the phase transition in hot nuclei and highlights the coherence of observed signatures, showing that the observed signatures are coherent.
59 citations
TL;DR: In this paper, a consistent description of the symmetry energy has been developed that joins the correct low-density limit with values calculated from quasiparticle approaches valid near the saturation density.
Abstract: The symmetry energy of nuclear matter is a fundamental ingredient in the investigation of exotic nuclei, heavy-ion collisions and astrophysical phenomena. A recently developed quantum statistical (QS) approach that takes the formation of clusters into account predicts low-density symmetry energies far above the usually quoted mean-field limits. A consistent description of the symmetry energy has been developed that joins the correct low-density limit with values calculated from quasiparticle approaches valid near the saturation density. The results are confronted with experimental values for free symmetry energies and internal symmetry energies, determined at sub-saturation densities and temperatures below 10MeV using data from heavy-ion collisions. There is very good agreement between the experimental symmetry energy values and those calculated in the QS approach.
33 citations
TL;DR: The heavy-ion phase-space exploration model is used to discuss the origin of the bimodality in charge asymmetry observed in nuclear reactions around the Fermi energy and it is proposed to use these reactions to study instabilities in rotating nuclear droplets.
Abstract: We use the HIPSE (Heavy-Ion Phase-Space Exploration) Model to discuss the origin of the bimodality in charge asymmetry observed in nuclear reactions around the Fermi energy. We show that it may be related to the important angular momentum (spin) transferred into the quasi-projectile before secondary decay. As the spin overcomes the critical value, a sudden opening of decay channels is induced and leads to a bimodal distribution for the charge asymmetry. In the model, it is not assigned to a liquid-gas phase transition but to specific instabilities in nuclei with high spin. Therefore, we propose to use these reactions to study instabilities in rotating nuclear droplets.
32 citations
References
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01 Jan 1985
743 citations
"Excitation energy and angular momen..." refers background in this paper
...This energy is then exhausted in various decay modes [1,2]: (i) sequential emission of γ rays, neutrons and/or light charged particles (LCP’s), (ii) fission of the nucleus in two fragments and (iii) simultaneous and/or prompt breakup in many fragments (the so-called multifragmentation process)....
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TL;DR: In this article, complex fragments of 3 Z ⪅35 have been detected in reverse-kinematics reactions of 93 Nb plus 9 Be, 12 C and 27 Al at bombarding energies of E / A = 11.4, 14.7 and 18.0 MeV.
405 citations
Book•
01 Jan 1992
TL;DR: In this article, a model of pre-equilibrium processes in reactions induced by composite particles and heavy ions is presented. But the model is not suitable for the case of complex compounds.
Abstract: Historical introduction Level and state densities Compound nucleus reactions Direct reactions Phenomenological models of pre-equilibrium processes Multistep compound reactions Multistep direct reactions Pre-equilibrium phenomena in reactions induced by composite particles and heavy ions References Author index Conference proceedings Subject index.
240 citations
"Excitation energy and angular momen..." refers background in this paper
...This mid-velocity contribution is usually attributed to a preequilibrium emission [36] or to a neck emission (the two outgoing partners being bound each other with a neck of nuclear matter) [37,38]....
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21 Apr 1995-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The INDRA detector as discussed by the authors is a highly segmented detector for light charged particles and fragments, which covers geometrically 90% of the 4π solid angle and has very low detection thresholds.
Abstract: INDRA, a new and innovative highly segmented detector for light charged particles and fragments is described. It covers geometrically 90% of the 4π solid angle and has very low detection thresholds. The detector, operated under vacuum, is axially symmetric and segmented in 336 independent cells allowing efficient detection of high multiplicity events. Nucleus identification down to very low energy threshold (≈ 1 A MeV) is achieved by using ionization chambers operated with low pressure C 3 F 8 gas. Residual energies are measured by a combination of silicon (300 μm thick) and cesium iodide (5 to 14 cm in length) detectors. Very forward angles are covered by fast counting phoswich scintillators (NE102/NE115). Charge resolution up to Z = 50 is achieved on a large energy dynamic range (5000 to 1 for silicon detectors). Isotopic separation is obtained up to Z = 3. The treatment of the signals is performed through specifically designed and highly integrated modules, most of which are in the new VXIbus standard. Full remote control of parameter settings, including visualization of signals, is thus allowed. The detector is continuously monitored with a laser source and electronic pulsers and is found stable over several days. Energy calibration procedures, making use of specific detectors and the ability of the GANIL accelerator to deliver secondary beams, have been developed. First experiments were performed in the spring of 1993.
219 citations