TIAN Wen-Dong 1, MA Yu-Gang 1, CAI Xiang-Zhou 1, FANG De-Qing 1, GUO Wei 1, MA Chun-Wang 1, LIU Gui-Hua 1,2, SHEN Wen-Qing 1, SHI Yu 1,2, SU Qian-Min 1,2, WANG Hong-Wei 1, WANG Kun 1, YAN Ting-ZHi
1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P.O. Box 800-204, Shanghai 201800
2 School of the Chinese Academy of Sciences, Beijing 100049
1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P.O. Box 800-204, Shanghai 201800
2 School of the Chinese Academy of Sciences, Beijing 100049
摘要A sequential decay model is used to study isoscaling, i.e. the factorization of the isotope ratios from sources of different isospins and sizes over a broad range of excitation energies, into fugacity terms of proton and neutron umber, R21(N,Z)=Y2(N,Z)/Y1(N,Z)=Cexp(αN+βZ). It is found that the isoscaling parameters α and β have a strong dependence on the isospin difference of equilibrated source and excitation energy, no significant influence of the ource size on α and β has been observed. It is found that α and β decrease with the excitation energy and are linear functions of 1/T and β(Z/A)2 or △(N/A)2 of the sources. Symmetry energy coefficient Csym is constrained from the relationship of α and source △(Z/A)2, β and source △(N/A)2.
Abstract：A sequential decay model is used to study isoscaling, i.e. the factorization of the isotope ratios from sources of different isospins and sizes over a broad range of excitation energies, into fugacity terms of proton and neutron umber, R21(N,Z)=Y2(N,Z)/Y1(N,Z)=Cexp(αN+βZ). It is found that the isoscaling parameters α and β have a strong dependence on the isospin difference of equilibrated source and excitation energy, no significant influence of the ource size on α and β has been observed. It is found that α and β decrease with the excitation energy and are linear functions of 1/T and β(Z/A)2 or △(N/A)2 of the sources. Symmetry energy coefficient Csym is constrained from the relationship of α and source △(Z/A)2, β and source △(N/A)2.
[1] Li B A and Schroeder W 2001 Isospin Physics in Heavy IonCollisions at Intermediate Energies (New York: Nova Science) [2] Di Toro M et al 1999 Prog. Nucl. Nucl. Phys. f 42125 and references therein [3] Li B A, Ko C M and Bauer W 1998 Int. J. Mod. Phys. Ef 7 147 and references therein [4] Ma Y G et al 1999 Phys. Rev. C f 60 024607 [5] M\"{uller H and Serot B D 1995 Phys. Rev. C f 52 2072 [6] Bombaci I, Kuo T S and Lombardo U 1994 Phys. Rep. f242 165 [7] Das Gupta S, Mekjian A Z and Tsang M B 2001 Adv. Nucl.Phys. f 26 91 [8] Xu H S et al 2000 Phys. Rev. Lett. f 85 716 [9] Tsang M B et al 2001 Phys. Rev. C f 64 041603(R) [10] Tsang M B et al 2001 Phys. Rev. Lett. f 86 5023 [11] Tsang M B et al 2001 Phys. Rev. C f 64 054615 [12] Brzychczyk J et al 1993 Phys. Rev. C f 47 1553 [13] Volkov V 1978 Phys. Rep. f 44 93 [14] Veselsky M, Souliotis G A and Jandel M 2004 Phys. Rev.C f 69 044607 [15] Souliotis G A et al 2003 Phys. Rev. C f 68 024605 [16] Botvina A S, Lozhkin O V and Trautmann W 2002 Phys.Rev. C f 65 044610 [17] Baran V et al 2005 Phys. Rep. f 410 335 [18] Geraci E et al 2004 Nucl Phys. A f 732 173 [19] Shetty D V et al 2004 Phys. Rev. C f 70 011601(R) [20] Wang K et al 2005 Chin. Phys. Lett. f 22 53 [21] Ma Y G et al 2005 Phys. Rev. C f 72 064603 [22] Ma Y G et al 2004 Phys. Rev. C f 69 064610 [23] Ono A, Danielewicz P, Friedman W A, Lynch W G and Tsang M B2003 Phys. Rev. C f 68 051601(R) [24] Tian W D et al 2005 Chin. Phys. Lett. f 22 306 [25] Raduta A R 2005 Eur. Phys. J. A f 24 85 [26] Tian W D et al nucl-th/0601079 [27] Fang D Q et al nucl-th/0601067 [28] Charity R J et al 1988 Nucl. Phys. A f 483 371 [29] Charity R J Computer Code GEMINI http://wunmr.wustl.edu/pub/gemini [30] Hauser H and Feshbach H 1952 Phys. Rev. f 87 366 [31] Moretto L G 1975 Nucl. Phys. A f 247 211 [32] Charity R J, Korolija M, Sarantites D G and Sobotka L G 1997 Phys. Rev. C f 56 873 [33] Bohr Aagr and Mottelson Ben R 1998 Nuclear Structures(New York: Benjamin) vol II [34] Krappe H J, Nix J R and Sierk A J 1979 Phys. Rev. Cf 20 992 [35] Moller P and Nix J R 1981 Nucl. Phys. A f 361 117 [36] Li B A and Chen L W 2006 Phys. Rev. C f 74 034610
LI Jia-Xing;LIU Ping-Ping;WANG Jian-Song;HU Zheng-Guo;MAO Rui-Shi;LI Chen;CHEN Ruo-Fu;SUN Zhi-Yu;XU Hu-Shan;XIAO Guo-Qing;GUO Zhong-Yan. Experimental Study on the Exotic Structure of 12N in RIBLL[J]. 中国物理快报, 2010, 27(3): 32501-032501.
2007, Vol. 24 
