A study of Gamow-teller strength using the 208Pb(p,n) and 181Ta(p,n) reactions at intermediate energy, Ep=122 MeV

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dc.contributor.advisorAschman, David Gen_ZA
dc.contributor.authorTshivhase, Victor Makondeleleen_ZA
dc.date.accessioned2016-03-17T12:46:55Z
dc.date.available2016-03-17T12:46:55Z
dc.date.issued1997en_ZA
dc.descriptionBibliography: p. [105] - 112.en_ZA
dc.description.abstractThe Gamow-Teller strength was measured in ²⁰⁸Pb(p,n)²⁰⁸Bi and ¹⁸¹Ta(p,n)¹⁸¹W reactions at an incident proton energy of 122 MeV. The experiment was performed using the beam-swinger facility at the National Accelerator Centre, Faure, South Africa. The time-of-flight(TOF) technique was employed with a flight-path of 100 m. Detectors comprised three stacks of four rectangular bars of NE 102A plastic scintillators. The outgoing neutrons were observed at laboratory angles, ΘLab = 0°, 2°, 4° and 10° . A multipole decomposition analysis of spectra associated with ²⁰⁸Pb(p,n)²⁰⁸Bi and ¹⁸¹Ta(p,n)¹⁸¹W reactions was performed using the results of distorted-wave impulse approximation (DWIA) calculations. The spectra associated with the two reactions were decomposed into L=0,1 and 2 transfer components. The major contribution to the spectra were found to be L=O, with a very small 1=2 multipole transfer contribution. The spectra were modelled with a combination of symmetrical Gaussians and a polynomial background. The GT strength was extracted by normalizing the cross section of the GT states to the cross section of the isobaric analogue state. The ΣB(GT) strength associated with the ²⁰⁸Pb(p,n)²⁰⁸Bi and ¹⁸¹Ta(p,n)¹⁸¹W reactions was found by summing the individual GT strength in the 0 - 23 MeV and 0 - 20 MeV excitation regions respectively. The ΣB(GT) strength associated with the ²⁰⁸Pb(p,n)²⁰⁸Bi and ¹⁸¹Ta(p,n)¹⁸¹W reactions were found to be less than the values predicted by the 3(N - Z) sum rule, being 81 ± 10% and 78 ± 3% of the sum rule strength respectively.en_ZA
dc.identifier.apacitationTshivhase, V. M. (1997). <i>A study of Gamow-teller strength using the 208Pb(p,n) and 181Ta(p,n) reactions at intermediate energy, Ep=122 MeV</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Physics. Retrieved from http://hdl.handle.net/11427/17971en_ZA
dc.identifier.chicagocitationTshivhase, Victor Makondelele. <i>"A study of Gamow-teller strength using the 208Pb(p,n) and 181Ta(p,n) reactions at intermediate energy, Ep=122 MeV."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Physics, 1997. http://hdl.handle.net/11427/17971en_ZA
dc.identifier.citationTshivhase, V. 1997. A study of Gamow-teller strength using the 208Pb(p,n) and 181Ta(p,n) reactions at intermediate energy, Ep=122 MeV. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Tshivhase, Victor Makondelele AB - The Gamow-Teller strength was measured in ²⁰⁸Pb(p,n)²⁰⁸Bi and ¹⁸¹Ta(p,n)¹⁸¹W reactions at an incident proton energy of 122 MeV. The experiment was performed using the beam-swinger facility at the National Accelerator Centre, Faure, South Africa. The time-of-flight(TOF) technique was employed with a flight-path of 100 m. Detectors comprised three stacks of four rectangular bars of NE 102A plastic scintillators. The outgoing neutrons were observed at laboratory angles, ΘLab = 0°, 2°, 4° and 10° . A multipole decomposition analysis of spectra associated with ²⁰⁸Pb(p,n)²⁰⁸Bi and ¹⁸¹Ta(p,n)¹⁸¹W reactions was performed using the results of distorted-wave impulse approximation (DWIA) calculations. The spectra associated with the two reactions were decomposed into L=0,1 and 2 transfer components. The major contribution to the spectra were found to be L=O, with a very small 1=2 multipole transfer contribution. The spectra were modelled with a combination of symmetrical Gaussians and a polynomial background. The GT strength was extracted by normalizing the cross section of the GT states to the cross section of the isobaric analogue state. The ΣB(GT) strength associated with the ²⁰⁸Pb(p,n)²⁰⁸Bi and ¹⁸¹Ta(p,n)¹⁸¹W reactions was found by summing the individual GT strength in the 0 - 23 MeV and 0 - 20 MeV excitation regions respectively. The ΣB(GT) strength associated with the ²⁰⁸Pb(p,n)²⁰⁸Bi and ¹⁸¹Ta(p,n)¹⁸¹W reactions were found to be less than the values predicted by the 3(N - Z) sum rule, being 81 ± 10% and 78 ± 3% of the sum rule strength respectively. DA - 1997 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1997 T1 - A study of Gamow-teller strength using the 208Pb(p,n) and 181Ta(p,n) reactions at intermediate energy, Ep=122 MeV TI - A study of Gamow-teller strength using the 208Pb(p,n) and 181Ta(p,n) reactions at intermediate energy, Ep=122 MeV UR - http://hdl.handle.net/11427/17971 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17971
dc.identifier.vancouvercitationTshivhase VM. A study of Gamow-teller strength using the 208Pb(p,n) and 181Ta(p,n) reactions at intermediate energy, Ep=122 MeV. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Physics, 1997 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17971en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Physicsen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherPhysicsen_ZA
dc.titleA study of Gamow-teller strength using the 208Pb(p,n) and 181Ta(p,n) reactions at intermediate energy, Ep=122 MeVen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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