کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1837053 | 1527166 | 2010 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Isoscaling of mass Aâ40 reconstructed quasiprojectiles from collisions in the Fermi energy regime
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
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چکیده انگلیسی
Isoscaling studies of fragments with Z=1-8 from reconstructed quasiprojectiles of mass Aâ40 from the Ar40+Sn124, 112Sn and Ca40+Sn124, 112Sn reactions at beam energy of 45 MeV/nucleon were performed. After initial efforts to obtain isoscaling with the “traditional” approach of using pairs of systems differing in their isospin asymmetry (or neutron-to-proton ratio N/Z), “intra-system” isoscaling for each of these four systems was obtained using fragment sources restricted in two narrow N/Z regions (one neutron-rich and one neutron-poor). The observed isoscaling behavior was excellent and the isoscaling parameter α was found to decrease with increasing excitation energy. Corrections due to undetected neutrons were also taken into account in the source N/Z determination by using the theoretical models DIT (Deep Inelastic Transfer) and SMM (Statistical Multifragmentation Model) along with a software replica of the experimental setup. These corrections were applied to the determination of the parameter Î (expressing the difference in the isospin asymmetry of the two sources used in the isoscaling). The reduced isoscaling parameter α/Î was obtained and found to decrease as the excitation energy of the quasiprojectile source increases, in good agreement with recent work on reconstructed mass Aâ80 quasiprojectiles. This decrease of α/Î may point to a decrease of the symmetry energy coefficient with increasing excitation energy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics A - Volume 837, Issues 3â4, 15 June 2010, Pages 145-162
Journal: Nuclear Physics A - Volume 837, Issues 3â4, 15 June 2010, Pages 145-162
نویسندگان
S. Galanopoulos, G.A. Souliotis, A.L. Keksis, M. Veselsky, Z. Kohley, L.W. May, D.V. Shetty, S.N. Soisson, B.C. Stein, S. Wuenschel, S.J. Yennello,