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Investigations of Reaction Cross Sections for Protons and 3He
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
2005 (English)Doctoral thesis, comprehensive summary (Other academic)Alternative title
Undersökningar av reaktionstvärsnitt för protoner och 3He (Swedish)
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. , p. 76
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 57
Keywords [en]
Nuclear physics, reaction cross section, protons, 3He, experimental method, transmission method, optical model, parametrization, matter distributions
Keywords [sv]
Kärnfysik
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-5813ISBN: 91-554-6261-8 (print)OAI: oai:DiVA.org:uu-5813DiVA, id: diva2:166486
Public defence
2005-05-25, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:30
Opponent
Supervisors
Available from: 2005-05-03 Created: 2005-05-03 Last updated: 2013-06-20Bibliographically approved
List of papers
1. Reaction cross sections of intermediate energy 3He-particles on targets from 9Be to 208Pb
Open this publication in new window or tab >>Reaction cross sections of intermediate energy 3He-particles on targets from 9Be to 208Pb
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2001 In: Nuclear Physics A, Vol. 696, no 1-2, p. 3-30Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-93104 (URN)
Available from: 2005-05-03 Created: 2005-05-03Bibliographically approved
2. A method for measuring light ion reaction cross-sections
Open this publication in new window or tab >>A method for measuring light ion reaction cross-sections
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2005 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 547, no 2-3, p. 541-554Article in journal (Refereed) Published
Abstract [en]

An experimental procedure for measuring reaction cross-sections of light ions in the energy range 20 50 MeV/nucleon, using a modified attenuation technique, is described. The detection method incorporates a forward detector that simultaneously measures the reaction cross-sections for five different sizes of the solid angle in steps from 99.1% to 99.8% of the total solid angle. The final reaction cross-section values are obtained by extrapolation to the full solid angle.

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-73948 (URN)10.1016/j.nima.2005.04.004 (DOI)
Available from: 2007-01-29 Created: 2007-01-29 Last updated: 2017-12-14Bibliographically approved
3. Reaction cross sections for protons on 12C, 40Ca, 90Zr and 208Pb at energies between 80 and 180 MeV
Open this publication in new window or tab >>Reaction cross sections for protons on 12C, 40Ca, 90Zr and 208Pb at energies between 80 and 180 MeV
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In: Physical Review CArticle in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-93106 (URN)
Available from: 2005-05-03 Created: 2005-05-03Bibliographically approved
4. Geometrical aspects of reaction cross sections for 3He, 4He and 12C projectiles
Open this publication in new window or tab >>Geometrical aspects of reaction cross sections for 3He, 4He and 12C projectiles
2003 In: Physical Review C, Vol. 67, p. 064605-Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-93107 (URN)
Available from: 2005-05-03 Created: 2005-05-03Bibliographically approved
5. Nucleon-nucleon scattering and the energy dependence of proton-nucleus reaction cross sections
Open this publication in new window or tab >>Nucleon-nucleon scattering and the energy dependence of proton-nucleus reaction cross sections
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-93108 (URN)
Available from: 2005-05-03 Created: 2005-05-03 Last updated: 2010-01-13Bibliographically approved

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