Disappearance of flow and the in-medium nucleon-nucleon cross section for 64Zn+27Al collisions at intermediate energies

Zhi Yong He; J. C. Angélique; A. Auger; G. Bizard; R. Brou; A. Buta; C. Cabot; E. Crema; D. Cussol; Guang Xi Dai; Y. El Masri; Ph Eudes; M. Gonin; K. Hagel; Gen Ming Jin; A. Kerambrum; C. Lebrun; Yu Gang Ma; A. Péghaire; J. Péter; R. Popescu; R. Régimbart; E. Rosato; F. Saint-Laurent; Wen Qing Shen; J. C. Steckmeyer; B. Tamain; E. Vient; R. Wada; Feng Shou Zhang

doi:10.1016/0375-9474(95)00486-6

Disappearance of flow and the in-medium nucleon-nucleon cross section for ⁶⁴Zn+²⁷Al collisions at intermediate energies

Zhi Yong He, J. C. Angélique, A. Auger, G. Bizard, R. Brou, A. Buta, C. Cabot, E. Crema, D. Cussol, Guang Xi Dai, Y. El Masri, Ph Eudes, M. Gonin, K. Hagel, Gen Ming Jin, A. Kerambrum, C. Lebrun, Yu Gang Ma, A. Péghaire, J. PéterR. Popescu, R. Régimbart, E. Rosato, F. Saint-Laurent, Wen Qing Shen, J. C. Steckmeyer, B. Tamain, E. Vient, R. Wada, Feng Shou Zhang

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Abstract

Light charged particles emitted from the reactions ⁶⁴Zn+²⁷Al at beam energies 49, 57, 69 and 79 MeV/u have been measured with a 4π multidetector array. The collective transverse momentum in the reaction plane (in-plane flow) is observed to vary strongly with the impact parameter and the emitted fragments. The flow parameter decreases monotonically from 49 to 79 MeV/u and falls to zero at a beam energy about 79 MeV/u in central collisions. This energy of vanishing flow increases with impact parameter and may be the same for different fragments. The disappearance of flow is also studied with the Boltzmann-Uehling-Uhlenbeck equation and it is demonstrated that the flow parameter and E_VF are very sensitive to the in-medium cross section σ_NN and weakly sensitive to the nuclear compressibility in central collisions. Comparisons with experimental data indicate that σ_NN is around 35 to 45 mb in central collisions.

Original language	English
Pages (from-to)	248-262
Number of pages	15
Journal	Nuclear Physics A
Volume	598
Issue number	2
DOIs	https://doi.org/10.1016/0375-9474(95)00486-6
Publication status	Published - 26 Feb 1996
Externally published	Yes

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He, Z. Y., Angélique, J. C., Auger, A., Bizard, G., Brou, R., Buta, A., Cabot, C., Crema, E., Cussol, D., Dai, G. X., El Masri, Y., Eudes, P., Gonin, M., Hagel, K., Jin, G. M., Kerambrum, A., Lebrun, C., Ma, Y. G., Péghaire, A., ... Zhang, F. S. (1996). Disappearance of flow and the in-medium nucleon-nucleon cross section for ⁶⁴Zn+²⁷Al collisions at intermediate energies. Nuclear Physics A, 598(2), 248-262. https://doi.org/10.1016/0375-9474(95)00486-6

@article{5e5917d86b244dc38d8cbc7cc9412829,

title = "Disappearance of flow and the in-medium nucleon-nucleon cross section for 64Zn+27Al collisions at intermediate energies",

abstract = "Light charged particles emitted from the reactions 64Zn+27Al at beam energies 49, 57, 69 and 79 MeV/u have been measured with a 4π multidetector array. The collective transverse momentum in the reaction plane (in-plane flow) is observed to vary strongly with the impact parameter and the emitted fragments. The flow parameter decreases monotonically from 49 to 79 MeV/u and falls to zero at a beam energy about 79 MeV/u in central collisions. This energy of vanishing flow increases with impact parameter and may be the same for different fragments. The disappearance of flow is also studied with the Boltzmann-Uehling-Uhlenbeck equation and it is demonstrated that the flow parameter and EVF are very sensitive to the in-medium cross section σNN and weakly sensitive to the nuclear compressibility in central collisions. Comparisons with experimental data indicate that σNN is around 35 to 45 mb in central collisions.",

author = "He, \{Zhi Yong\} and Ang{\'e}lique, \{J. C.\} and A. Auger and G. Bizard and R. Brou and A. Buta and C. Cabot and E. Crema and D. Cussol and Dai, \{Guang Xi\} and \{El Masri\}, Y. and Ph Eudes and M. Gonin and K. Hagel and Jin, \{Gen Ming\} and A. Kerambrum and C. Lebrun and Ma, \{Yu Gang\} and A. P{\'e}ghaire and J. P{\'e}ter and R. Popescu and R. R{\'e}gimbart and E. Rosato and F. Saint-Laurent and Shen, \{Wen Qing\} and Steckmeyer, \{J. C.\} and B. Tamain and E. Vient and R. Wada and Zhang, \{Feng Shou\}",

year = "1996",

month = feb,

day = "26",

doi = "10.1016/0375-9474(95)00486-6",

language = "English",

volume = "598",

pages = "248--262",

journal = "Nuclear Physics A",

issn = "0375-9474",

number = "2",

}

He, ZY, Angélique, JC, Auger, A, Bizard, G, Brou, R, Buta, A, Cabot, C, Crema, E, Cussol, D, Dai, GX, El Masri, Y, Eudes, P, Gonin, M, Hagel, K, Jin, GM, Kerambrum, A, Lebrun, C, Ma, YG, Péghaire, A, Péter, J, Popescu, R, Régimbart, R, Rosato, E, Saint-Laurent, F, Shen, WQ, Steckmeyer, JC, Tamain, B, Vient, E, Wada, R & Zhang, FS 1996, 'Disappearance of flow and the in-medium nucleon-nucleon cross section for ⁶⁴Zn+²⁷Al collisions at intermediate energies', Nuclear Physics A, vol. 598, no. 2, pp. 248-262. https://doi.org/10.1016/0375-9474(95)00486-6

TY - JOUR

T1 - Disappearance of flow and the in-medium nucleon-nucleon cross section for 64Zn+27Al collisions at intermediate energies

AU - He, Zhi Yong

AU - Angélique, J. C.

AU - Auger, A.

AU - Bizard, G.

AU - Brou, R.

AU - Buta, A.

AU - Cabot, C.

AU - Crema, E.

AU - Cussol, D.

AU - Dai, Guang Xi

AU - El Masri, Y.

AU - Eudes, Ph

AU - Gonin, M.

AU - Hagel, K.

AU - Jin, Gen Ming

AU - Kerambrum, A.

AU - Lebrun, C.

AU - Ma, Yu Gang

AU - Péghaire, A.

AU - Péter, J.

AU - Popescu, R.

AU - Régimbart, R.

AU - Rosato, E.

AU - Saint-Laurent, F.

AU - Shen, Wen Qing

AU - Steckmeyer, J. C.

AU - Tamain, B.

AU - Vient, E.

AU - Wada, R.

AU - Zhang, Feng Shou

PY - 1996/2/26

Y1 - 1996/2/26

N2 - Light charged particles emitted from the reactions 64Zn+27Al at beam energies 49, 57, 69 and 79 MeV/u have been measured with a 4π multidetector array. The collective transverse momentum in the reaction plane (in-plane flow) is observed to vary strongly with the impact parameter and the emitted fragments. The flow parameter decreases monotonically from 49 to 79 MeV/u and falls to zero at a beam energy about 79 MeV/u in central collisions. This energy of vanishing flow increases with impact parameter and may be the same for different fragments. The disappearance of flow is also studied with the Boltzmann-Uehling-Uhlenbeck equation and it is demonstrated that the flow parameter and EVF are very sensitive to the in-medium cross section σNN and weakly sensitive to the nuclear compressibility in central collisions. Comparisons with experimental data indicate that σNN is around 35 to 45 mb in central collisions.

AB - Light charged particles emitted from the reactions 64Zn+27Al at beam energies 49, 57, 69 and 79 MeV/u have been measured with a 4π multidetector array. The collective transverse momentum in the reaction plane (in-plane flow) is observed to vary strongly with the impact parameter and the emitted fragments. The flow parameter decreases monotonically from 49 to 79 MeV/u and falls to zero at a beam energy about 79 MeV/u in central collisions. This energy of vanishing flow increases with impact parameter and may be the same for different fragments. The disappearance of flow is also studied with the Boltzmann-Uehling-Uhlenbeck equation and it is demonstrated that the flow parameter and EVF are very sensitive to the in-medium cross section σNN and weakly sensitive to the nuclear compressibility in central collisions. Comparisons with experimental data indicate that σNN is around 35 to 45 mb in central collisions.

U2 - 10.1016/0375-9474(95)00486-6

DO - 10.1016/0375-9474(95)00486-6

M3 - Article

AN - SCOPUS:16144366624

SN - 0375-9474

VL - 598

SP - 248

EP - 262

JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 2

ER -

Disappearance of flow and the in-medium nucleon-nucleon cross section for 64Zn+27Al collisions at intermediate energies

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Disappearance of flow and the in-medium nucleon-nucleon cross section for ⁶⁴Zn+²⁷Al collisions at intermediate energies