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Geometrical aspects of reaction cross sections for 3He, 4He and 12C projectiles
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
2003 In: Physical Review C, Vol. 67, 064605- p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2003. Vol. 67, 064605- p.
URN: urn:nbn:se:uu:diva-93107OAI: oai:DiVA.org:uu-93107DiVA: diva2:166484
Available from: 2005-05-03 Created: 2005-05-03Bibliographically approved
In thesis
1. Investigations of Reaction Cross Sections for Protons and 3He
Open this publication in new window or tab >>Investigations of Reaction Cross Sections for Protons and 3He
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Undersökningar av reaktionstvärsnitt för protoner och 3He
Abstract [en]

The reaction cross section gives the probability that a particle will undergo a nonelastic process when passing through a nuclear medium. Therefore reaction cross section data are of importance both for theoretical studies and for applications in such diverse fields as medicine, biology, astrophysics and accelerator-driven transmutation of nuclear waste.

There exist many data sets with angular distributions of elastic scattering, but very few measurements of the complementary reaction cross section have been performed. The measurement is in principle simple but has in practice proved to be very difficult to perform, and the relatively limited amount of experimental data displays some serious inconsistencies.

Results from measurements of reaction cross sections are presented for:

3He on 9Be, 12C, 16O, 28Si, 40Ca, 58,60Ni, 112,116,118,120,124Sn and 208Pb at 96, 138 and 167 MeV

• protons on 12C, 40Ca, 90Zr and 208Pb at six energies in the energy range 80-180 MeV, and on

58Ni at 81 MeV.

Experimental uncertainties were 3-9% for 3He and 1.5-8% for protons.

The apparatus and the experimental method used for the measurements of reaction cross sections, using a modified attenuation technique, is described. The detection method enables simultaneous measurements of reaction cross sections for five different sizes of the solid angles in steps from 99.0 to 99.8% of the total solid angle. The final results are obtained by extrapolation to the full solid angle.

Experimental results are compared with predictions from optical model calculations using phenomenological global optical potentials.

Phenomenological parametrizations of reaction cross sections for scattering of projectiles on targets are presented. The parametrizations show that reaction cross sections are very sensitive to matter distributions at very large radii of both the projectile and the target. For protons the derived relations makes it possible to predict the reaction cross sections on targets for which no experimental data exist.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. 76 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 57
Nuclear physics, reaction cross section, protons, 3He, experimental method, transmission method, optical model, parametrization, matter distributions, Kärnfysik
National Category
Subatomic Physics
urn:nbn:se:uu:diva-5813 (URN)91-554-6261-8 (ISBN)
Public defence
2005-05-25, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:30
Available from: 2005-05-03 Created: 2005-05-03 Last updated: 2013-06-20Bibliographically approved

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