Neutron removal in peripheral relativistic heavy-ion collisions

T. Aumann; C. A. Bertulani; K. Sümmere

doi:10.1103/PhysRevC.51.416

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Neutron removal in peripheral relativistic heavy-ion collisions

T. Aumann, C. A. Bertulani, and K. Sümmere

Institut für Kernchemie, Universität Mainz, D-55099 Mainz, Germany
Gesellschaft für Schwerionenforschung, Planckstr. 1, D-64291 Darmstadt, Germany
Instituto de Física, Universidade Federal do Rio de Janeiro, 21945-970 Rio de Janeiro, RJ, Brazil

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Phys. Rev. C 51, 416 – Published 1 January, 1995

DOI: https://doi.org/10.1103/PhysRevC.51.416

Abstract

We investigate the relativistic Coulomb fragmentation of ${}^{197}{Au}$ by heavy ions, leading to one-, two-, and three-neutron removal. To resolve the ambiguity connected with the choice of a specific minimum impact parameter in a semiclassical calculation, a microscopic approach is developed based on nucleon-nucleon collisions (‘‘soft-spheres’’ model). This approach is compared with experimental data for ${}^{197}{Au}$ at 1 GeV/nucleon and with a calculation using the ‘‘sharp-cutoff’’ approximation. We find that the harmonic-oscillator model predicting a Poisson distribution of the excitation probabilities of multiphonon states gives a good agreement with one-neutron removal cross sections but is unable to reach an equally good agreement with three-neutron removal cross sections.

References (19)

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[c1] LAND Collaboration, R. Schmidt et al., Phys. Rev. Lett. 70, 1767 (1993).

[c2] LAND Collaboration, E. Wajda et al., Nucl. Phys. A569, 141c (1994).

[c3] J. Ritman et al., Phys. Rev. Lett. 70, 533 (1993); , ibid. 70, 2659(E) (1993).

[c4] J.R. Beene, Nucl. Phys. A569, 163c (1994).

[c5] T. Aumann et al., Phys. Rev. C 47, 1728 (1993); , Nucl. Phys. A569, 157c (1994).

[c6] C.A. Bertulani and G. Baur, Phys. Rep. 163, 299 (1988).

[c7] H. Emling, Prog. Part. Nucl. Phys. 33, 729 (1994).

[c8] C.A. Bertulani and V. Zelevinsky, Phys. Rev. Lett. 71, 967 (1993); Nucl. Phys. A568, 931 (1994).

[c9] V.Yu. Ponomarev et al., Phys. Rev. Lett. 72, 1168 (1994).

[c10] L.F. Canto et al., Phys. Rev. Lett. 72, 2147 (1994).

[c11] W.J. Llope and P. Braun Munzinger, Phys. Rev. C 41, 2644 (1990); ibid. 45, 799 (1992).

[c12] E. Merzbacher, Quantum Mechanics, 2nd ed. (Wiley, New York, 1970).

[c13] C.J. Benesh et al., Phys. Rev. C 40, 1198 (1989).

[c14] S. Kox et al., Phys. Rev. C 35, 1678 (1987).

[c15] W.D. Myers and W.J. Swiatecki, Ann. Phys. 55, 395 (1969); ibid. 84, 186 (1974).

[c16] Shen Wen Qing, Nucl. Phys. A491, 130 (1989).

[c17] A. Veyssière et al., Nucl. Phys. A159, 561 (1970); B.L. Berman et al., Phys. Rev. C 36, 1286 (1987).

[c18] GSI version of the code alice [M. Blann and F. Plasil, Phys. Rev. Lett. 29, 303 (1972)]; W. Reisdorf and M. Schädel, Z. Phys. A 343, 47 (1992).

[c19] J.C. Hill et al., Phys. Lett. B 273, 371 (1991), and references therein.

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Neutron removal in peripheral relativistic heavy-ion collisions

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