Onset of collective expansion in nucleus-nucleus collisions below 100 MeV/u

S. C. Jeong; D. Cussol; D. Durand; R. Laforest; J. Péter; J. C. Angélique; G. Auger; G. Bizard; R. Brou; A. Buta; C. Cabot; Y. Cassagnou; E. Crema; Y. El Masri; P. Eudes; Z. Y. He; A. Kerambrun; C. Lebrun; R. Legrain; J. P. Patry; A. Péghaire; R. Régimbart; E. Rosato; F. Saint-Laurent; J. C. Steckmeyer; B. Tamain; E. Vient

doi:10.1016/0375-9474(96)00115-7

Onset of collective expansion in nucleus-nucleus collisions below 100 MeV/u

S. C. Jeong, D. Cussol, D. Durand, R. Laforest, J. Péter, J. C. Angélique, G. Auger, G. Bizard, R. Brou, A. Buta, C. Cabot, Y. Cassagnou, E. Crema, Y. El Masri, P. Eudes, Z. Y. He, A. Kerambrun, C. Lebrun, R. Legrain, J. P. PatryA. Péghaire, R. Régimbart, E. Rosato, F. Saint-Laurent, J. C. Steckmeyer, B. Tamain, E. Vient

Research output: Contribution to journal › Article

16 Scopus citations

Abstract

In ³⁶Ar + ²⁷A1 reactions at bombarding energies E/A from 55 to 95 MeV, the mass and excitation energy of the quasi-projectile have been reconstructed at all impact parameters. Up to excitation energies E*/A of ∼ 5-6 MeV, the mean kinetic energies of Z = 1 to Z = 9 fragments are in agreement with values predicted by sequential statistical decay. Above, a collective expansion energy is needed that grows with E*/A, reaching 1 to 2.2 MeV/u, depending on the de-excitation process, at E*/A ∼ 10 MeV. It decreases with the fragment charge. The dominant role of excitation energy supports the scenario of thermal expansion.

Original language	English
Pages (from-to)	208-218
Number of pages	11
Journal	Nuclear Physics A
Volume	604
Issue number	2
DOIs	https://doi.org/10.1016/0375-9474(96)00115-7
State	Published - Jul 8 1996
Externally published	Yes

Keywords

Deduced quasi-projectile mass, excitation energy, thermal expansion evidence
Measured fragment kinetic energy and charges with 4π-array
Nuclear reactions al(ar, x), e = 55-95 mev/nucleon

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10.1016/0375-9474(96)00115-7

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Jeong, S. C., Cussol, D., Durand, D., Laforest, R., Péter, J., Angélique, J. C., Auger, G., Bizard, G., Brou, R., Buta, A., Cabot, C., Cassagnou, Y., Crema, E., El Masri, Y., Eudes, P., He, Z. Y., Kerambrun, A., Lebrun, C., Legrain, R., ... Vient, E. (1996). Onset of collective expansion in nucleus-nucleus collisions below 100 MeV/u. Nuclear Physics A, 604(2), 208-218. https://doi.org/10.1016/0375-9474(96)00115-7

Jeong, S. C. ; Cussol, D. ; Durand, D. ; Laforest, R. ; Péter, J. ; Angélique, J. C. ; Auger, G. ; Bizard, G. ; Brou, R. ; Buta, A. ; Cabot, C. ; Cassagnou, Y. ; Crema, E. ; El Masri, Y. ; Eudes, P. ; He, Z. Y. ; Kerambrun, A. ; Lebrun, C. ; Legrain, R. ; Patry, J. P. ; Péghaire, A. ; Régimbart, R. ; Rosato, E. ; Saint-Laurent, F. ; Steckmeyer, J. C. ; Tamain, B. ; Vient, E. / Onset of collective expansion in nucleus-nucleus collisions below 100 MeV/u. In: Nuclear Physics A. 1996 ; Vol. 604, No. 2. pp. 208-218.

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title = "Onset of collective expansion in nucleus-nucleus collisions below 100 MeV/u",

abstract = "In 36Ar + 27A1 reactions at bombarding energies E/A from 55 to 95 MeV, the mass and excitation energy of the quasi-projectile have been reconstructed at all impact parameters. Up to excitation energies E*/A of ∼ 5-6 MeV, the mean kinetic energies of Z = 1 to Z = 9 fragments are in agreement with values predicted by sequential statistical decay. Above, a collective expansion energy is needed that grows with E*/A, reaching 1 to 2.2 MeV/u, depending on the de-excitation process, at E*/A ∼ 10 MeV. It decreases with the fragment charge. The dominant role of excitation energy supports the scenario of thermal expansion.",

keywords = "Deduced quasi-projectile mass, excitation energy, thermal expansion evidence, Measured fragment kinetic energy and charges with 4π-array, Nuclear reactions al(ar, x), e = 55-95 mev/nucleon",

author = "Jeong, {S. C.} and D. Cussol and D. Durand and R. Laforest and J. P{\'e}ter and Ang{\'e}lique, {J. C.} and G. Auger and G. Bizard and R. Brou and A. Buta and C. Cabot and Y. Cassagnou and E. Crema and {El Masri}, Y. and P. Eudes and He, {Z. Y.} and A. Kerambrun and C. Lebrun and R. Legrain and Patry, {J. P.} and A. P{\'e}ghaire and R. R{\'e}gimbart and E. Rosato and F. Saint-Laurent and Steckmeyer, {J. C.} and B. Tamain and E. Vient",

year = "1996",

month = jul,

day = "8",

doi = "10.1016/0375-9474(96)00115-7",

language = "English",

volume = "604",

pages = "208--218",

journal = "Nuclear Physics, Section A",

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Jeong, SC, Cussol, D, Durand, D, Laforest, R, Péter, J, Angélique, JC, Auger, G, Bizard, G, Brou, R, Buta, A, Cabot, C, Cassagnou, Y, Crema, E, El Masri, Y, Eudes, P, He, ZY, Kerambrun, A, Lebrun, C, Legrain, R, Patry, JP, Péghaire, A, Régimbart, R, Rosato, E, Saint-Laurent, F, Steckmeyer, JC, Tamain, B & Vient, E 1996, 'Onset of collective expansion in nucleus-nucleus collisions below 100 MeV/u', Nuclear Physics A, vol. 604, no. 2, pp. 208-218. https://doi.org/10.1016/0375-9474(96)00115-7

Onset of collective expansion in nucleus-nucleus collisions below 100 MeV/u. / Jeong, S. C.; Cussol, D.; Durand, D.; Laforest, R.; Péter, J.; Angélique, J. C.; Auger, G.; Bizard, G.; Brou, R.; Buta, A.; Cabot, C.; Cassagnou, Y.; Crema, E.; El Masri, Y.; Eudes, P.; He, Z. Y.; Kerambrun, A.; Lebrun, C.; Legrain, R.; Patry, J. P.; Péghaire, A.; Régimbart, R.; Rosato, E.; Saint-Laurent, F.; Steckmeyer, J. C.; Tamain, B.; Vient, E.

In: Nuclear Physics A, Vol. 604, No. 2, 08.07.1996, p. 208-218.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Onset of collective expansion in nucleus-nucleus collisions below 100 MeV/u

AU - Jeong, S. C.

AU - Cussol, D.

AU - Durand, D.

AU - Laforest, R.

AU - Péter, J.

AU - Angélique, J. C.

AU - Auger, G.

AU - Bizard, G.

AU - Brou, R.

AU - Buta, A.

AU - Cabot, C.

AU - Cassagnou, Y.

AU - Crema, E.

AU - El Masri, Y.

AU - Eudes, P.

AU - He, Z. Y.

AU - Kerambrun, A.

AU - Lebrun, C.

AU - Legrain, R.

AU - Patry, J. P.

AU - Péghaire, A.

AU - Régimbart, R.

AU - Rosato, E.

AU - Saint-Laurent, F.

AU - Steckmeyer, J. C.

AU - Tamain, B.

AU - Vient, E.

PY - 1996/7/8

Y1 - 1996/7/8

N2 - In 36Ar + 27A1 reactions at bombarding energies E/A from 55 to 95 MeV, the mass and excitation energy of the quasi-projectile have been reconstructed at all impact parameters. Up to excitation energies E*/A of ∼ 5-6 MeV, the mean kinetic energies of Z = 1 to Z = 9 fragments are in agreement with values predicted by sequential statistical decay. Above, a collective expansion energy is needed that grows with E*/A, reaching 1 to 2.2 MeV/u, depending on the de-excitation process, at E*/A ∼ 10 MeV. It decreases with the fragment charge. The dominant role of excitation energy supports the scenario of thermal expansion.

AB - In 36Ar + 27A1 reactions at bombarding energies E/A from 55 to 95 MeV, the mass and excitation energy of the quasi-projectile have been reconstructed at all impact parameters. Up to excitation energies E*/A of ∼ 5-6 MeV, the mean kinetic energies of Z = 1 to Z = 9 fragments are in agreement with values predicted by sequential statistical decay. Above, a collective expansion energy is needed that grows with E*/A, reaching 1 to 2.2 MeV/u, depending on the de-excitation process, at E*/A ∼ 10 MeV. It decreases with the fragment charge. The dominant role of excitation energy supports the scenario of thermal expansion.

KW - Deduced quasi-projectile mass, excitation energy, thermal expansion evidence

KW - Measured fragment kinetic energy and charges with 4π-array

KW - Nuclear reactions al(ar, x), e = 55-95 mev/nucleon

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U2 - 10.1016/0375-9474(96)00115-7

DO - 10.1016/0375-9474(96)00115-7

M3 - Article

AN - SCOPUS:16144366542

VL - 604

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EP - 218

JO - Nuclear Physics, Section A

JF - Nuclear Physics, Section A

SN - 0375-9474

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