基于 ribll 测量对称能 —— 同位旋标度法和同质异位素产额比方法的对比
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HIRFL-RIBLL 合作体第 2 次会议. 基于 RIBLL 测量对称能 —— 同位旋标度法和同质异位素产额比方法的对比. 马春旺 Email: [email protected] 王闪闪 , 张艳丽 河南师范大学物理学系. 1.Backgrounds. Nuclear symmetry energy Induced by the difference between neutron and proton (numbers/density distributions); Temperature- and density- dependent; - PowerPoint PPT PresentationTRANSCRIPT
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RIBLL Email: [email protected],
HIRFL-RIBLL2
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1.BackgroundsNuclear symmetry energyInduced by the difference between neutron and proton (numbers/density distributions);Temperature- and density- dependent;Various of observables promoted in theory and exp.; no consistent results obtained;Important parameter in nucl. Phys., nucl astrophys etc.;Still an open question.Heavy-ion reactions (HICs)(RIB) Provide the lab of sub-saturate and supra-saturate nuclear mattersHigh temperature of primary fragment, relatively low temperature of final fragmentdecrease of temperature in secondary decay processFinite neutron-rich isotopes measured with some low temperature, which relates to sub-saturate nuclear matterDifficult to understand the symmetry energy of neutron-rich nucleus
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1.BackgroundsProbes B.A. Li/L.W. Chen/C.M. KoPhys. Rep. 464, 113(2008)New choice: Isobaric methods
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1.BackgroundsIsotopic yields in HICsFragments: measured after the secondary decay process (after particle emitting ceases )A low but nonzero temperature;Yields reflect its free energy (due to temperature) and the chemical property of the colliding source;Free energy: alter the terms contributing to the binding energy B(T);Chemical property of the colliding source the symmetry energy of the source;Important for the search of the very neutron-rich nucleus near the dripline.From fragments-- probes to symmetry energy in HICsIsotopic scalingsymmetry energy of the source (T and density depended)Neutron-skin thickness indirect probes for symmetry energyIsobaric ratiosymmetry energy of neutron-rich fragments at low T;From fragments-- probes to temperature in HICsIsotopic temperatures (Albergo thermometer)Excitation energy, kinetic energy spectrum, thermal energy, etc.Isobaric ratio
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1. backgroundsisobaric yield ratioHIC
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2. Theoretical analysis,(isoscaling)
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2.1Methods: isoscalingisoscalingRelating the yields of fragments to the source propertyn/p fixed source, nandp vary slowly with the size of source; temperature in reactions to be the same (same fragment)Isotopic ratio () to n, and isotoinc ratio() to p , difference between and to Csym. Csym: temperature dependenceSecondary decay effectPRL85,716(2000);JPG34,2173(2007);PRC81,064613(2010);PRC72,064603(2005);PRC78,014605(2008);PRC80,044606(2009);PRC73,044601(2006);PRC68,051601(R)(2003);EPJA30,129(2006);PRC64,054615(2001);PRC65,044610(2002Different type of models;Different type of reactions
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2.2 Isobaric ratio difference methodisoscaling,.,
I=N-Z,,
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F,isoscaling,()
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3. Results and discussionIsoscaling results
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3. Results and discussion140A MeV 48Ca/40Ca+9Be,I,AI=01,A,
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3. Results and discussion140A MeV 58Ni/64Ni +9Be48,40Ca,,I,AI=01,A,
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3. Results and discussion140A MeV 58Ni/40Ca +9Be,A,
- 3. Results and discussion140A MeV 48Ca/64Ni +9BeI
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result and discussiondifferent targetsisospin diffusion? need carefully check
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3. Results and discussion,lnR21isoscaling-IYR,Tisobaric fragments,isoscaling,T.,IYRlnR21> (-):-,IYR, lnR21,
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4. Ribll,,Proj-Like,Targ.-Like.~35A MeV40,48Ca+12C PL,TL.(AMD)