Multiplicity fluctuation analysis of target residues in nucleus-emulsion collisions at a few hundred MeV/nucleon

  • Multiplicity fluctuation of the target evaporated fragments emitted in 290 MeV/u 12C-AgBr, 400 MeV/u 12C-AgBr, 400 MeV/u 20Ne-AgBr and 500 MeV/u 56Fe-AgBr interactions is investigated using the scaled factorial moment method in two-dimensional normal phase space and cumulative variable space, respectively. It is found that in normal phase space the scaled factorial moment (ln<Fq>) increases linearly with the increase of the divided number of phase space (lnM) for lower q-value and increases linearly with the increase of lnM, and then becomes saturated or decreased for a higher q-value. In cumulative variable space ln<Fq> decreases linearly with increase of lnM. This indicates that no evidence of non-statistical multiplicity fluctuation is observed in our data sets. So, any fluctuation indicated in the results of normal variable space analysis is totally caused by the non-uniformity of the single-particle density distribution.
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  • [1] Bialas A, Peschanski R. Nucl. Phys. B, 1986, 70: 703-718[2] Ghosh D, Deb A, Chattopadhyay R et al. Phys. Rev. C, 1998, 58: 3553-3559[3] Ghosh D, Ghosh P, Ghosh A, Roy J. Phys. Rev. C, 1994, 49: R1747-R1750[4] Ghosh D, Deb A, Bhttacharyya S et al. Intern. J. Mod. Phys. E, 2003, 12: 407-419[5] Sarkar S, Goswami T D, Ghosh D, Deb A. Czech. J. Phys., 2003, 53: 133-141[6] Dheer S, Das G, Shivpuri R K, Soni S K. Phys. Rev. C, 1995, 52: 1572-1579[7] ZHANG Dong-Hai, LI Xue-Qin, JIA Hui-Ming et al. Chin. Phys., 2007, 16: 2689-2700[8] Ghosh D, Deb A, Mondal M et al. Eur. Phys. J. A, 2002, 14: 77-80[9] Ghosh D, Deb A, Bhattacharyya S et al. J. Phys. G, 2003, 29: 983-992[10] ZHANG Dong-Hai, LI Hui-Ling. Chin. Phys. B, 2009, 18: 522-530[11] ZHANG Dong-Hai, NIU Yao-Jie, WANG Li-Chun et al. Chin. Phys. B, 2010, 19: 072501[12] Powell C F, Fowler P H, Perkins D H. The Study of Elementary Particles by the Photographic Method. Oxford, Pergamon, 1959[13] Bialas A, Gozdzicki M. Phys. Lett. B, 1990, 252: 483-486
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ZHANG Dong-Hai, CHEN Yan-Ling, WANG Guo-Rong, LI Wang-Dong, WANG Qing, YAO Ji-Jie, ZHOU Jian-Guo, ZHENG Su-Hua, XU Li-Ling, MIAO Hui-Feng and WANG Peng. Multiplicity fluctuation analysis of target residues in nucleus-emulsion collisions at a few hundred MeV/nucleon[J]. Chinese Physics C, 2014, 38(7): 074001. doi: 10.1088/1674-1137/38/7/074001
ZHANG Dong-Hai, CHEN Yan-Ling, WANG Guo-Rong, LI Wang-Dong, WANG Qing, YAO Ji-Jie, ZHOU Jian-Guo, ZHENG Su-Hua, XU Li-Ling, MIAO Hui-Feng and WANG Peng. Multiplicity fluctuation analysis of target residues in nucleus-emulsion collisions at a few hundred MeV/nucleon[J]. Chinese Physics C, 2014, 38(7): 074001.  doi: 10.1088/1674-1137/38/7/074001 shu
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Received: 2013-08-19
Revised: 1900-01-01
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Multiplicity fluctuation analysis of target residues in nucleus-emulsion collisions at a few hundred MeV/nucleon

    Corresponding author: ZHANG Dong-Hai,

Abstract: Multiplicity fluctuation of the target evaporated fragments emitted in 290 MeV/u 12C-AgBr, 400 MeV/u 12C-AgBr, 400 MeV/u 20Ne-AgBr and 500 MeV/u 56Fe-AgBr interactions is investigated using the scaled factorial moment method in two-dimensional normal phase space and cumulative variable space, respectively. It is found that in normal phase space the scaled factorial moment (ln<Fq>) increases linearly with the increase of the divided number of phase space (lnM) for lower q-value and increases linearly with the increase of lnM, and then becomes saturated or decreased for a higher q-value. In cumulative variable space ln<Fq> decreases linearly with increase of lnM. This indicates that no evidence of non-statistical multiplicity fluctuation is observed in our data sets. So, any fluctuation indicated in the results of normal variable space analysis is totally caused by the non-uniformity of the single-particle density distribution.

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