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Searching for the low-energy enhancement in 91zR

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dc.contributor.advisor Wiedeking, M.
dc.contributor.advisor Kheswa, B.V
dc.contributor.advisor Ntshangase, S.S
dc.contributor.author Zikhali, Bonginkosi Richard
dc.date.accessioned 2017-07-03T13:17:09Z
dc.date.available 2017-07-03T13:17:09Z
dc.date.issued 2017
dc.identifier.uri http://hdl.handle.net/10530/1569
dc.description A thesis submitted to the Faculty of Science and Agriculture in partial fulfillment of the Degree of Master of Science in the Department of Physics and Engineering at the University of Zululand, 2017 en_US
dc.description.abstract The nuclear level density (NLD) and -ray strength function (SF) are quantities that give essential information about the behaviour of a nucleus at high excitation energy. NLD is defined as the number of levels per unit of excitation energy. SF is de_ned as a measure of the average reduced decay probability of a nucleus. These concepts are useful at high excitation energies where the spacing between the levels is small and gives information on degrees of freedom and underlying nuclear dynamics. The evidence of the low-energy enhancement in the SF for energies less than 4 MeV has been discovered in several nuclei. Recently, a strong enhancement of M1 transitions in 90Zr has been predicted for -ray energies below 2 MeV in shell model calculations. In this work we explored the existence of the low-energy enhancement in the neighbouring 91Zr isotope with the assumption that neigbouring isotopes have similar SF and hence provided _rst experimental NLD and SF for this nucleus. The experiment 90Zr(d,p)91Zr was conducted at the Oslo Cyclotron Laboratory (OCL). The SiRi (silicon telescope) array was used to detect charged ejectiles from the reaction. The CACTUS (NaI(Tl) detectors) array was utilized to detect rays that were in coincidence with charged particles. The nuclear level density and SF were extracted with the Oslo method. The existence of the LEE was observed, which agrees with the shell model calculations in 90Zr. The NLD and SF quantities were used to calculate (n,) cross sections with the Talys reaction codes. These were compared with experimental data from direct measurement to test the reliability of the approach used in this work. en_US
dc.description.sponsorship National Research Foundation en_US
dc.publisher University of Zululand en_US
dc.subject low energy enhancement --nuclear level density en_US
dc.title Searching for the low-energy enhancement in 91zR en_US
dc.type Thesis en_US

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