Evidence for an absorption effect in neutron emission in the20Ne +58Ni reaction at 30 MeV per nucleon
Tóm tắt
Neutron energy spectra were analysed at various angles in coincidence with projectile-like fragments in the reaction20Ne +58Ni at 30 MeV per nucleon. The data have been parametrized with a three moving source fit, taking into account the emission from discrete excited states of the coincident light fragments and the recoil effect due to the emission of neutrons by light nuclei. A nucleon-nucleon scattering description of the intermediate velocity source gives good fits to the data. However the necessity of introducing a reabsorption effect in the projectile-like and target-like nuclei for the nucleons from that source is demonstrated by testing the momentum and energy balances in the fitting procedure. The mean free path of nucleons in nuclear matter is determined. A good agreement is then obtained for the lowest momentum transfers where single scattering dominates. For the largest momentum transfer another mechanism such as double scattering or one-body friction must be introduced in order to reproduce the data.
Tài liệu tham khảo
citation_journal_title=Prog. Part. Nucl. Phys.; citation_author=P. Schuck, R.W. Hasse, J. Jaenicke, C. Grégoire, B. Remaud, F. Sébille, E. Suraud; citation_volume=22; citation_publication_date=1989; citation_pages=181; citation_id=CR1
Hartnack, C., Stöcker, H., Greiner, W.: UFTP Preprint 216/1988
citation_journal_title=Nucl. Phys.; citation_author=H. Nifenecker, J. Blachot, J. Crançon, A. Gizon, A. Llères; citation_volume=A447; citation_publication_date=1985; citation_pages=533; citation_id=CR3
citation_journal_title=Phys. Lett.; citation_author=G. Auger, E. Plagnol, D. Jouan, C. Guet, D. Heuer, M. Maurel, H. Nifenecker, C. Ristori, F. Schussler, H. Doubre, C. Grégoire; citation_volume=169B; citation_publication_date=1986; citation_pages=161; citation_id=CR4
citation_journal_title=Phys. Rev.; citation_author=V.E. Viola, B.B. Back, K.L. Wolf, T.C. Awes, C.K. Gelbke, H. Breuer; citation_volume=C26; citation_publication_date=1982; citation_pages=178; citation_id=CR5
Fatyga, M., Kwiatkowski, K., Viola, V.E., Wilson, W.G., Tsang, M.B., Pochodzalla, J., Lynch, W.G., Gelbke, C.K., Fields, D.F., Chitwood, C.B.: Preprint INC-40007-42
citation_journal_title=Z. Phys. A — Atoms and Nuclei; citation_author=E. Holub, M. Korolija, N. Cindro; citation_volume=314; citation_publication_date=1983; citation_pages=347; citation_id=CR7
citation_journal_title=Phys. Rev.; citation_author=A.I. Gavron, J.R. Beene, B. Cheynis, R.L. Ferguson, F.E. Obenshain, F. Plasil, G.R. Young, G.A. Petitt, C.F. Maguire, D.G. Sarantites, M. Jääskeläinen, K. Geoffroy-Young; citation_volume=C27; citation_publication_date=1983; citation_pages=450; citation_id=CR8
citation_journal_title=Phys. Rev.; citation_author=W.P. Zank, D. Hilscher, G. Ingold, U. Jahnke, M. Lehmann, H. Rossner; citation_volume=C33; citation_publication_date=1986; citation_pages=519; citation_id=CR9
citation_journal_title=Phys. Lett.; citation_author=A.S. Goldhaber; citation_volume=53B; citation_publication_date=1974; citation_pages=306; citation_id=CR10
Heuer, D.: Thèse de doctorat de spécialité, Université de Grenoble (1983)
citation_journal_title=Nucl. Phys.; citation_author=D.K. Scott; citation_volume=A354; citation_publication_date=1981; citation_pages=375c; citation_id=CR12
citation_journal_title=Z. Phys. A — Atoms and Nuclei; citation_author=V. Borrel, D. Guerreau, J. Galin, B. Gatty, D. Jacquet, X. Tarrago; citation_volume=314; citation_publication_date=1983; citation_pages=191; citation_id=CR13
Cheynis, B.: Thèse de doctorat d'Etat, Université de Lyon (1987)
citation_journal_title=Nucl. Instrum. Methods; citation_author=R.A. Cecil, B.D. Anderson, R. Madey; citation_volume=161; citation_publication_date=1979; citation_pages=439; citation_id=CR15
citation_journal_title=Z. Phys. A — Atoms and Nuclei; citation_author=B. Chambon, D. Drain, C. Pastor, A. Dauchy, A. Giorni, C. Morand; citation_volume=312; citation_publication_date=1983; citation_pages=125; citation_id=CR16
citation_journal_title=Nucl. Instrum. Methods Phys. Res.; citation_author=F. Deak, A. Kiss, Z. Seres, G. Caskey, A. Galonsky, B. Remington; citation_volume=A258; citation_publication_date=1987; citation_pages=67; citation_id=CR17
citation_journal_title=Phys. Rev.; citation_author=G. Caskey, A. Galonsky, B. Remington, F. Deak, A. Kiss, Z. Seres; citation_volume=C34; citation_publication_date=1986; citation_pages=506; citation_id=CR18
citation_journal_title=Nucl. Phys.; citation_author=K.J. LeCouteur, D.W. Lang; citation_volume=13; citation_publication_date=1959; citation_pages=32; citation_id=CR19
citation_journal_title=Nucl. Phys.; citation_author=F. Ajzenberg-Selove; citation_volume=A413; citation_publication_date=1984; citation_pages=1; citation_id=CR20
citation_journal_title=Nucl. Phys.; citation_author=M.T. Collins, J.J. Griffin; citation_volume=A348; citation_publication_date=1980; citation_pages=63; citation_id=CR21
citation_journal_title=Nucl. Phys.; citation_author=H.C. Chiang, J. Hümer; citation_volume=A349; citation_publication_date=1980; citation_pages=466; citation_id=CR22
citation_journal_title=Phys. Lett.; citation_author=J.P. Jeukenne, A. Lejeune, C. Mahaux; citation_volume=25C; citation_publication_date=1976; citation_pages=83; citation_id=CR23
citation_title=Nuclear matter and nuclear reactions; citation_publication_date=1968; citation_id=CR24; citation_author=K. Kikushi; citation_author=M. Kawai; citation_publisher=North-Holland