Impact Parameter Dependence of the Double Neutron/Proton Ratio of Nucleon Emissions in Isotopic Reaction Systems
ZHANG Xun-Chao1,2, LI Bao-An3, CHEN Lie-Wen4,5, YONG Gao-Chan1
1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 7300002Graduate School of Chinese Academy of Sciences, Beijing 1000493Department of Physics, Texas A&M University-Commerce, Commerce, Texas 75429-3011, USA4Institute of Theoretical Physics, Shanghai Jiao Tong University, Shanghai 2002405Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000
Impact Parameter Dependence of the Double Neutron/Proton Ratio of Nucleon Emissions in Isotopic Reaction Systems
ZHANG Xun-Chao1,2, LI Bao-An3, CHEN Lie-Wen4,5, YONG Gao-Chan1
1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 7300002Graduate School of Chinese Academy of Sciences, Beijing 1000493Department of Physics, Texas A&M University-Commerce, Commerce, Texas 75429-3011, USA4Institute of Theoretical Physics, Shanghai Jiao Tong University, Shanghai 2002405Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000
摘要Within the transport model IBUU04, we investigate the double neutron/proton ratio of free nucleons taken from two reaction systems using two Sn isotopes at a beam energy of 50MeV/nucleon and with impact parameters 2fm, 4fm and 8fm, respectively. It is found that the double neutron/proton ratio from peripheral collisions is more sensitive to the density dependence of the symmetry energy than those from mid-central and central collisions.
Abstract：Within the transport model IBUU04, we investigate the double neutron/proton ratio of free nucleons taken from two reaction systems using two Sn isotopes at a beam energy of 50MeV/nucleon and with impact parameters 2fm, 4fm and 8fm, respectively. It is found that the double neutron/proton ratio from peripheral collisions is more sensitive to the density dependence of the symmetry energy than those from mid-central and central collisions.
(Monte Carlo simulations (including hadron and parton cascades and string breaking models))
引用本文:
ZHANG Xun-Chao;LI Bao-An;CHEN Lie-Wen;YONG Gao-Chan. Impact Parameter Dependence of the Double Neutron/Proton Ratio of Nucleon Emissions in Isotopic Reaction Systems[J]. 中国物理快报, 2009, 26(5): 52502-052502.
ZHANG Xun-Chao, LI Bao-An, CHEN Lie-Wen, YONG Gao-Chan. Impact Parameter Dependence of the Double Neutron/Proton Ratio of Nucleon Emissions in Isotopic Reaction Systems. Chin. Phys. Lett., 2009, 26(5): 52502-052502.
[1] Li B A, Chen L W and Ko C M 2008 Phys. Rep. 464 113 [2] Chen L W, Ko C M and Li B A 2005 Phys. Rev. Lett. 94 032701 [3] Zuo W, Lejeune A, Lombardo U et al 2002 Eur. Phys.J. A 14 469 [4] Brown B A 2000 Phys. Rev. Lett. 85 5296 [5] Stone J R, Miller J C, Koncewicz R et al 2004 Phys.Rev. C 68 034324 [6] Lattimer J M and Prakash M 2000 Phys. Rep. 333121 [7] Tanihata I 2001 Nucl. Phys. A 693 [8] Li B A, Ko C M, and Ren Z Z 1997 Phys. Rev. Lett. 78 1644 [9] Liu J Y, Zhao Q, Wang S Q et al 2001 Nucl. Phys. A 687 475 [10] M\"{uller H and Serot B D 1995 Phys. Rev. C 52 072 [11] Li B A and Ko C M 1997 Nucl. Phys. A 618 498 [12] Baran V, Colonna M, Toro M D et al 1998 Nucl.Phys. A 632 287 [13] Xu H S, Tsang M B, Liu T X et al 2000 Phys. Rev.Lett. 85 716 [14] Tan W P, Li B A, Donangelo R et al 2001 Phys.Rev. C 64 051901 [15] Baran V, Colonna M, Toro M D et al 2002 Nucl.Phys. A 703 603 [16] Fang D Q, Ma Y G, Zhong C et al 2007 J. Phys. G 34 2173 [17] Chen L W, Greco V, Ko C M et al 2003 Phys. Rev.Lett. 90 162701 [18] Chen L W, Ko C M and Li B A 2003 Phys. Rev. C 68 017601 [19] Zhang Y and Li Z 2005 Phys. Rev. C 71 024604 [20] Chen L W, Ko C M and Li B A 2004 Phys. Rev. C 69 054606 [21] Shi L and Danielewicz P 2003 Phys. Rev. C 68064604 [22] Li B A 2001 Phys. Rev. C 64 054604 [23] Li B A 2002 Phys. Rev. Lett. 88 192701 [24] Gaitanos T, Toro M D, Typel S et al 2004 Nucl.Phys. A 732 24 [25] Li Q F, Li Z X, Soff S et al 2005 Phys. Rev. C 72 034613 [26] Li Q F, Li Z X, Z L W et al 2006 Phys. Lett. B 634 378 [27] Li B A, Chen L W, Yong G C et al 2006 Phys. Lett.B 634 378 [28] Das C B, Gupta S Das, Gale C et al 2003 Phys.Rev. C 67 034611 [29] Li B A, Das C B, Das G S et al 2004 Nucl. Phys. A 735 563 [30] Li B A 2004 Phys. Rev. C 69 064602. [31] Li B A and Chen L W 2005 Phys. Rev. C 72064611
2009, Vol. 26 
