Le Fèvre A, Auger G, Begemann-Blaich M L, Bellaize N, Bittiger R, Bocage F, Borderie B, Bougault R, Bouriquet B, Charvet J L, Chbihi A, Dayras R, Durand D, Frankland J D, Galichet E, Gourio D, Guinet D, Hudan S, Immé G, Lautesse P, Lavaud F, Legrain R, Lopez O, Łukasik J, Lynen U, Müller W F J, Nalpas L, Orth H, Plagnol E, Raciti G, Rosato E, Saija A, Schwarz C, Seidel W, Sfienti C, Tamain B, Trautmann W, Trzciński A, Turzó K, Vient E, Vigilante M, Volant C, Zwiegliński B, Botvina A S
Gesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, Germany.
Phys Rev Lett. 2005 Apr 29;94(16):162701. doi: 10.1103/PhysRevLett.94.162701. Epub 2005 Apr 26.
Isotopic effects in the fragmentation of excited target residues following collisions of 12C on (112,124)Sn at incident energies of 300 and 600 MeV per nucleon were studied with the INDRA 4pi detector. The measured yield ratios for light particles and fragments with atomic number Z < or = 5 obey the exponential law of isotopic scaling. The deduced scaling parameters decrease strongly with increasing centrality to values smaller than 50% of those obtained for the peripheral event groups. Symmetry-term coefficients, deduced from these data within the statistical description of isotopic scaling, are near gamma = 25 MeV for peripheral and gamma < 15 MeV for central collisions.
利用INDRA 4π探测器研究了每核子入射能量为300和600 MeV时，12C与(112,124)Sn碰撞后激发靶残余物碎裂中的同位素效应。对于原子序数Z≤5的轻粒子和碎片，测量得到的产额比遵循同位素标度的指数规律。推导得到的标度参数随着中心度的增加而强烈减小，其值小于外围事件组所获得值的50%。在同位素标度的统计描述中，根据这些数据推导得到的对称项系数，对于外围碰撞接近γ = 25 MeV，对于中心碰撞γ < 15 MeV。
