Validation of spallation models

thesis
3
2
dc.abstract.enThe aim of the present work was to assess the model capabilities in describing the proton induced spallation reactions. To understand the reaction mechanism, di erent sets of observables must be investigated, inclusive as well as exclusive. Based on these criteria, the e orts were done to survey the scienti c literature for the selection of representative data sets which ts the need. The selected data were rich in terms of production of various ejectiles: neutrons, light charged particles (LCP: p, d, t, 3He, 4He), intermediate mass fragments, i.e., the particles with atomic mass number (ALCP < AIMF < Afissionfragments), and target-like heavy residua. Several atomic nuclei from Al up to Pb were selected as representative for all the targets. The proton beam covered the broad range of energies from 180 MeV to 3000 MeV. The spallation reaction was treated as a two stage process. In the rst stage, the incident proton initiates the cascade of binary collisions with target nucleons leaving behind an excited remnant. The second stage consists in the decay of this excited remnant nucleus. The selection of best models to describe each of these two stages was done on the basis of previous benchmark e orts where INCL4.5 model was found to be the best to describe the rst stage of the reaction. Therefore the newest version of this model - INCL4.6 was used in the present study. Four theoretical models di erent in approach to the reaction mechanism were chosen to realize the description of the second stage: ABLA07, GEMINI++, SMM, GEM2. Qualitative as well as quantitative comparisons of model calculations with experimental data were undertaken. To judge the quality of models the agreement in magnitude of di erent observables with model predictions as well as reproduction of the shape of the mass, angle and energy distributions of the cross sections were taken into account. Various deviation factors were used for providing ranking and validation of the spallation models. The statistical properties of the test factors, i.e., their expectation value, variance and probability density function were studied carefully. Two new statistical deviation factors named M􀀀factor and A􀀀factor were proposed in the present work. They are equally good as the best factors used up to now in the literature but are more intuitive. The ranking of models obtained by the application of the deviation factors were compared with the qualitative estimation of the data reproduction. It was found that all the studied models are able to reproduce the main characteristics of the data, however systematic deviations were observed and their interpretation was proposed.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiegopl
dc.contributor.advisorKamys, Bogusław - 128616 pl
dc.contributor.authorSharma, Sushil - 200161 pl
dc.contributor.institutionJagiellonian University. Faculty of Physics, Astronomy and Applied Computer Science. Marian Smoluchowski Institute of Physics. Department of Nuclear Physicspl
dc.contributor.institutionResearch Center Jülich. Nuclear Physics Institutepl
dc.contributor.reviewerKisiel, Janpl
dc.contributor.reviewerKozela, Adampl
dc.date.accessioned2017-07-04T08:52:52Z
dc.date.available2017-07-04T08:52:52Z
dc.date.openaccess0
dc.date.submitted2015-07-09pl
dc.description.accesstimew momencie opublikowania
dc.description.physical[2], II, [2], 158pl
dc.description.versionostateczna wersja autorska (postprint)
dc.identifier.callnumberDokt. 2015/169pl
dc.identifier.urihttp://ruj.uj.edu.pl/xmlui/handle/item/42262
dc.languageengpl
dc.placeKrakówpl
dc.rightsCopyright*
dc.rights.licenceOTHER
dc.rights.simpleviewWolny dostęp
dc.rights.urihttp://ruj.uj.edu.pl/4dspace/License/copyright/licencja_copyright.pdf*
dc.share.typeotwarte repozytorium
dc.subject.enspallationpl
dc.subject.enmultifragmentationpl
dc.subject.enmodel validationpl
dc.subject.plspalacjapl
dc.subject.plmultifragmentacjapl
dc.subject.plwalidacja modelipl
dc.titleValidation of spallation modelspl
dc.title.alternativeWalidacja modeli spalacjipl
dc.typeThesispl
dspace.entity.typePublication
dc.abstract.enpl
The aim of the present work was to assess the model capabilities in describing the proton induced spallation reactions. To understand the reaction mechanism, di erent sets of observables must be investigated, inclusive as well as exclusive. Based on these criteria, the e orts were done to survey the scienti c literature for the selection of representative data sets which ts the need. The selected data were rich in terms of production of various ejectiles: neutrons, light charged particles (LCP: p, d, t, 3He, 4He), intermediate mass fragments, i.e., the particles with atomic mass number (ALCP < AIMF < Afissionfragments), and target-like heavy residua. Several atomic nuclei from Al up to Pb were selected as representative for all the targets. The proton beam covered the broad range of energies from 180 MeV to 3000 MeV. The spallation reaction was treated as a two stage process. In the rst stage, the incident proton initiates the cascade of binary collisions with target nucleons leaving behind an excited remnant. The second stage consists in the decay of this excited remnant nucleus. The selection of best models to describe each of these two stages was done on the basis of previous benchmark e orts where INCL4.5 model was found to be the best to describe the rst stage of the reaction. Therefore the newest version of this model - INCL4.6 was used in the present study. Four theoretical models di erent in approach to the reaction mechanism were chosen to realize the description of the second stage: ABLA07, GEMINI++, SMM, GEM2. Qualitative as well as quantitative comparisons of model calculations with experimental data were undertaken. To judge the quality of models the agreement in magnitude of di erent observables with model predictions as well as reproduction of the shape of the mass, angle and energy distributions of the cross sections were taken into account. Various deviation factors were used for providing ranking and validation of the spallation models. The statistical properties of the test factors, i.e., their expectation value, variance and probability density function were studied carefully. Two new statistical deviation factors named M􀀀factor and A􀀀factor were proposed in the present work. They are equally good as the best factors used up to now in the literature but are more intuitive. The ranking of models obtained by the application of the deviation factors were compared with the qualitative estimation of the data reproduction. It was found that all the studied models are able to reproduce the main characteristics of the data, however systematic deviations were observed and their interpretation was proposed.
dc.affiliationpl
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
dc.contributor.advisorpl
Kamys, Bogusław - 128616
dc.contributor.authorpl
Sharma, Sushil - 200161
dc.contributor.institutionpl
Jagiellonian University. Faculty of Physics, Astronomy and Applied Computer Science. Marian Smoluchowski Institute of Physics. Department of Nuclear Physics
dc.contributor.institutionpl
Research Center Jülich. Nuclear Physics Institute
dc.contributor.reviewerpl
Kisiel, Jan
dc.contributor.reviewerpl
Kozela, Adam
dc.date.accessioned
2017-07-04T08:52:52Z
dc.date.available
2017-07-04T08:52:52Z
dc.date.openaccess
0
dc.date.submittedpl
2015-07-09
dc.description.accesstime
w momencie opublikowania
dc.description.physicalpl
[2], II, [2], 158
dc.description.version
ostateczna wersja autorska (postprint)
dc.identifier.callnumberpl
Dokt. 2015/169
dc.identifier.uri
http://ruj.uj.edu.pl/xmlui/handle/item/42262
dc.languagepl
eng
dc.placepl
Kraków
dc.rights*
Copyright
dc.rights.licence
OTHER
dc.rights.simpleview
Wolny dostęp
dc.rights.uri*
http://ruj.uj.edu.pl/4dspace/License/copyright/licencja_copyright.pdf
dc.share.type
otwarte repozytorium
dc.subject.enpl
spallation
dc.subject.enpl
multifragmentation
dc.subject.enpl
model validation
dc.subject.plpl
spalacja
dc.subject.plpl
multifragmentacja
dc.subject.plpl
walidacja modeli
dc.titlepl
Validation of spallation models
dc.title.alternativepl
Walidacja modeli spalacji
dc.typepl
Thesis
dspace.entity.type
Publication
Affiliations

* The migration of download and view statistics prior to the date of April 8, 2024 is in progress.

Views
1
Views per month