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Elastic neutron scattering at 96 MeV from 12C and 208Pb
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research, Applied Nuclear Physics.
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2003 (English)In: Physical Review C, Vol. 68, 064605-064622 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2003. Vol. 68, 064605-064622 p.
Identifiers
URN: urn:nbn:se:uu:diva-96691OAI: oai:DiVA.org:uu-96691DiVA: diva2:171349
Available from: 2008-02-08 Created: 2008-02-08 Last updated: 2013-02-18
In thesis
1. Neutron Scattering at 96 MeV
Open this publication in new window or tab >>Neutron Scattering at 96 MeV
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Data on elastic scattering of 96 MeV neutrons from 56Fe, 89Y and 208Pb in the angular interval 10-70° are presented. The previously published data on 208Pb have been extended, as a new method has been developed to obtain additional information at the most forward angles. The results are compared with phenomenological and microscopic optical potentials. The theory predictions are in general in good agreement with the experimental data.

A study of the deviation of the zero-degree cross section from Wick's limit has been performed. The data on 208Pb are in agreement with Wick's limit, while those on lighter nuclei overshoot the limit significantly.

A novel analysis method has been developed to obtain the inelastic neutron emission cross sections from the existing 56Fe data. The method is based on folding a trial spectrum with the response of the detector setup. The data cover the angular interval 26-65° and an excitation energy range of 0-45 MeV, ranges hitherto not studied. The results are compared with nuclear model predictions and found to be in good agreement with the experimental data.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2008. 52 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 389
Keyword
Nuclear physics, neutron, elastic scattering, inelastic scattering, differential cross section, optical model potential, Wick's limit, angular distribution, pre-equilibrium, Kärnfysik
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-8425 (URN)978-91-554-7079-1 (ISBN)
Public defence
2008-02-29, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2008-02-08 Created: 2008-02-08 Last updated: 2009-04-29Bibliographically approved
2. Neutron-Deuteron Scattering and Three-Body Interactions
Open this publication in new window or tab >>Neutron-Deuteron Scattering and Three-Body Interactions
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Neutron-Deuteronspridning och Trekropparväxelverkan
Abstract [en]

High-precision differential cross section data of the neutron-deuteron elastic scattering reaction at 95 MeV are presented. The neutron-proton scattering differential cross section was also measured and used as a reference to allow an accurate absolute normalization of the neutron-deuteron data.

Two multi-detector arrays were used, MEDLEY and SCANDAL, at the neutron beam facility at The Svedberg Laboratory in Uppsala. Three different configurations of the detectors allowed to perform three independent measurements. The first experiment involved detecting recoil deuterons from thin deuterated polyethylene targets with the MEDLEY setup and allowed a large angular coverage. In the second experiment, high-precision data were obtained at neutron backward angles, using the SCANDAL setup with the same technique. For the third experiment, data were obtained in the forward angular range using the SCANDAL setup with a technique where neutrons scattered on heavy water were detected by neutron-proton conversion in plastic scintillators and tracking the protons through the detectors. Events from elastic neutron-deuteron scattering were identified in the data analysis, and differential cross sections were obtained after applying corrections and evaluating systematic uncertainties due to effects which could affect the shape or the absolute normalization of the data.

The results are compared with modern Faddeev calculations using realistic nucleon-nucleon potentials combined with three-nucleon interactions. The effects of three-nucleon forces are expected to increase the differential cross section by about 30% in the region of the minimum. The data agree with this prediction, thus providing evidence for three-nucleon force effects.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. vii + 42 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 163
Keyword
Nuclear physics, three-body force, neutron, deuteron, elastic scattering, angular distribution, Faddeev equations, Kärnfysik
Identifiers
urn:nbn:se:uu:diva-6739 (URN)91-554-6514-5 (ISBN)
Public defence
2006-05-24, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15
Opponent
Supervisors
Available from: 2006-04-28 Created: 2006-04-28 Last updated: 2012-04-11Bibliographically approved
3. Elastic Neutron Scattering at 96 MeV
Open this publication in new window or tab >>Elastic Neutron Scattering at 96 MeV
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A facility for studies of elastic neutron scattering in the 50–130 MeV range has been developed. In addition to elastic neutron scattering, it has been used for (n,p) and (n,d) reaction experiments. The performance of the device has been illustrated in measurements of the (n,p) and (n,n) cross sections on 1H and 12C.

Elastic neutron scattering from 12C and 208Pb has been studied at 96 MeV in the 10–70 degree interval. The achieved energy resolution, 3.7 MeV, is about one order of magnitude better than for any previous experiment above 65 MeV incident energy. The present experiment represents the highest neutron energy where the ground state has been resolved from the first excited state in neutron scattering. A novel method for normalization of the absolute scale of the cross section has been used. The estimated normalization uncertainty, 3 %, is unprecedented for a neutron-induced differential cross section measurement on a nuclear target.

The results are compared with modern optical model predictions, based on phenomenology or microscopic nuclear theory. The data on 208Pb are in general in good agreement with the theory models.

All theory models fail to describe the 12C data in the 30–50 degree interval, where the models predict a saddle structure not displayed by the present experimental data. Various reasons for this discrepancy have been investigated. For the other parts of the angular range studied, the agreement is good.

These measurements have to a large degree been motivated by needs in various application areas, i.e., nuclear waste incineration by fast neutrons and biomedical effects caused by neutrons. The implications of the present results on these applications are discussed.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. vi, 50 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 854
Keyword
Nuclear physics, neutron, detection, CsI, elastic scattering, differential cross section, optical potential, kerma, Kärnfysik
National Category
Subatomic Physics
Research subject
Applied Nuclear Physics
Identifiers
urn:nbn:se:uu:diva-3453 (URN)91-554-5663-4 (ISBN)
Public defence
2003-06-06, Polhemsalen, Ångströmlaboratoriet, Uppsala, 13:15
Opponent
Supervisors
Available from: 2003-05-14 Created: 2003-05-14 Last updated: 2012-04-11Bibliographically approved

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