Competition of break-up and dissipative processes in peripheral collisions at Fermi energies
Heavy ion collisions in the Fermi energy regime may simultaneously show features of direct and dissipative processes. To investigate this behavior in detail, we study isotope and velocity distributions of projectile-like fragments in the reactions 18O (35 MeV/A) + 9Be(181Ta) at forward angles. We d...
Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Institute for Nuclear Research, National Academy of Sciences of Ukraine
2009-03-01
|
| Series: | Ядерна фізика та енергетика |
| Online Access: | http://jnpae.kinr.kiev.ua/10.1/Articles_PDF/jnpae-2009-10-0045-Mikhailova.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850251508323450880 |
|---|---|
| author | T. I. Mikhailova A. G. Artyukh M. Colonna M. Di Toro B. Erdemchimeg G. KaminskiI N. Mikhailov Yu. M. Sereda H. H. Wolter |
| author_facet | T. I. Mikhailova A. G. Artyukh M. Colonna M. Di Toro B. Erdemchimeg G. KaminskiI N. Mikhailov Yu. M. Sereda H. H. Wolter |
| author_sort | T. I. Mikhailova |
| collection | DOAJ |
| description | Heavy ion collisions in the Fermi energy regime may simultaneously show features of direct and dissipative processes.
To investigate this behavior in detail, we study isotope and velocity distributions of projectile-like fragments in the reactions 18O (35 MeV/A) + 9Be(181Ta) at forward angles. We decompose the experimental velocity distributions empirically into two contributions: a direct, ‘break-up’ component centered at beam velocity and a dissipative component at lower velocities leading to a tail of the velocity distributions. The direct component is interpreted in the Goldhaber model, and the widths of the velocity distributions are extracted. The dissipative component is then successfully described by transport calculations. The ratio of the yields of the direct and the dissipative contributions can be understood from the behavior of the deflection functions. The isotope distributions of the dissipative component agree qualitatively with the data, but the modification due to secondary de-excitation needs to be considered. We conclude that such reactions are of interest to study the equilibration mechanism in heavy ion collisions. |
| format | Article |
| id | doaj-art-7df82236d841454a8f14ebfe1c1fb79d |
| institution | OA Journals |
| issn | 1818-331X 2074-0565 |
| language | English |
| publishDate | 2009-03-01 |
| publisher | Institute for Nuclear Research, National Academy of Sciences of Ukraine |
| record_format | Article |
| series | Ядерна фізика та енергетика |
| spelling | doaj-art-7df82236d841454a8f14ebfe1c1fb79d2025-08-20T01:57:52ZengInstitute for Nuclear Research, National Academy of Sciences of UkraineЯдерна фізика та енергетика1818-331X2074-05652009-03-011014549Competition of break-up and dissipative processes in peripheral collisions at Fermi energiesT. I. Mikhailova0A. G. Artyukh1M. ColonnaM. Di Toro2B. Erdemchimeg3G. KaminskiI4N. Mikhailov5Yu. M. Sereda6H. H. Wolter7Joint Institute for Nuclear Research, Dubna, Moscow region, RussiaJoint Institute for Nuclear Research, Dubna, Moscow region, RussiaLaboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Catania, ItalyJoint Institute for Nuclear Research, Dubna, Moscow region, Russia; Mongolian National University, Nuclear Research Center, Ulaanbaatar, MongoliaJoint Institute for Nuclear Research, Dubna, Moscow region, Russia; Institute of Nuclear Physics PAN, Krakow, PolandJoint Institute for Nuclear Research, Dubna, Moscow region, RussiaJoint Institute for Nuclear Research, Dubna, Moscow region, Russia; Institute for Nuclear Research National Academy of Sciences of Ukraine, Kyiv, UkraineFaculty of Physics, University of Munich, Garching, GermanyHeavy ion collisions in the Fermi energy regime may simultaneously show features of direct and dissipative processes. To investigate this behavior in detail, we study isotope and velocity distributions of projectile-like fragments in the reactions 18O (35 MeV/A) + 9Be(181Ta) at forward angles. We decompose the experimental velocity distributions empirically into two contributions: a direct, ‘break-up’ component centered at beam velocity and a dissipative component at lower velocities leading to a tail of the velocity distributions. The direct component is interpreted in the Goldhaber model, and the widths of the velocity distributions are extracted. The dissipative component is then successfully described by transport calculations. The ratio of the yields of the direct and the dissipative contributions can be understood from the behavior of the deflection functions. The isotope distributions of the dissipative component agree qualitatively with the data, but the modification due to secondary de-excitation needs to be considered. We conclude that such reactions are of interest to study the equilibration mechanism in heavy ion collisions.http://jnpae.kinr.kiev.ua/10.1/Articles_PDF/jnpae-2009-10-0045-Mikhailova.pdf |
| spellingShingle | T. I. Mikhailova A. G. Artyukh M. Colonna M. Di Toro B. Erdemchimeg G. KaminskiI N. Mikhailov Yu. M. Sereda H. H. Wolter Competition of break-up and dissipative processes in peripheral collisions at Fermi energies Ядерна фізика та енергетика |
| title | Competition of break-up and dissipative processes in peripheral collisions at Fermi energies |
| title_full | Competition of break-up and dissipative processes in peripheral collisions at Fermi energies |
| title_fullStr | Competition of break-up and dissipative processes in peripheral collisions at Fermi energies |
| title_full_unstemmed | Competition of break-up and dissipative processes in peripheral collisions at Fermi energies |
| title_short | Competition of break-up and dissipative processes in peripheral collisions at Fermi energies |
| title_sort | competition of break up and dissipative processes in peripheral collisions at fermi energies |
| url | http://jnpae.kinr.kiev.ua/10.1/Articles_PDF/jnpae-2009-10-0045-Mikhailova.pdf |
| work_keys_str_mv | AT timikhailova competitionofbreakupanddissipativeprocessesinperipheralcollisionsatfermienergies AT agartyukh competitionofbreakupanddissipativeprocessesinperipheralcollisionsatfermienergies AT mcolonna competitionofbreakupanddissipativeprocessesinperipheralcollisionsatfermienergies AT mditoro competitionofbreakupanddissipativeprocessesinperipheralcollisionsatfermienergies AT berdemchimeg competitionofbreakupanddissipativeprocessesinperipheralcollisionsatfermienergies AT gkaminskii competitionofbreakupanddissipativeprocessesinperipheralcollisionsatfermienergies AT nmikhailov competitionofbreakupanddissipativeprocessesinperipheralcollisionsatfermienergies AT yumsereda competitionofbreakupanddissipativeprocessesinperipheralcollisionsatfermienergies AT hhwolter competitionofbreakupanddissipativeprocessesinperipheralcollisionsatfermienergies |