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Experimental study of $^{10}$​Li with low energy (d,p) reactions

In this thesis, I present the results from three experiments studying the structure of $^{10}$Li through neutron transfer reactions at different beam energies. All three experiments were performed at the ISOLDE facility at CERN with a radioactive $^{9}$Li beam impinging on deuterated plastic. The re...

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Autor principal: Jensen, Jesper Halkjaer
Lenguaje:eng
Publicado: 2020
Materias:
Acceso en línea:http://cds.cern.ch/record/2707141
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author Jensen, Jesper Halkjaer
author_facet Jensen, Jesper Halkjaer
author_sort Jensen, Jesper Halkjaer
collection CERN
description In this thesis, I present the results from three experiments studying the structure of $^{10}$Li through neutron transfer reactions at different beam energies. All three experiments were performed at the ISOLDE facility at CERN with a radioactive $^{9}$Li beam impinging on deuterated plastic. The results of the elastic channels are compared with OM and CDCC calculations. The result of the neutron transfer reactions is compared with CDCC calculations using a novel structure model of $^{10}$Li. The first experiment was carried out at 2.68 MeV/A in 2005 and give evidence for the existence of a virtual $s$$_{1/2}$ state in $^{10}$Li. Furthermore, it confirms the position of a $p$$_{1/2}$ resonance close to 0.5MeV. Coincidences between protons and $^{9}$Li, from the break up of $^{9}$Li, provides evidence for a sequential reaction model, however, the applied model can not account for the magnitude of the measured cross sections. In the second and third experiment at 6.72 MeV/A and 8.0 MeV/A, respectively, there are indications for a higher-lying $d$$_{5/2}$ resonance, however, this result is more speculative. The model also struggles to reproduce the absolute cross sections at these energies. Besides the results from the experiments, I present some of the technical methods that have been used and developed during the experiments and data analysis. This includes the data acquisition system and a general-purpose library for experiments with silicon detectors, AUSAlib. Moreover, the kinematic considerations that go into both the design and the analysis phase are discussed. Two techniques to determine beam properties are discussed. One is based on coincidences and mainly discussed through simulations whereas the other is based on only the ejectile of a two-body reaction. A Monte Carlo method for transforming measurements into absolute cross sections presented as well.
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institution Organización Europea para la Investigación Nuclear
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publishDate 2020
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spelling cern-27071412020-02-17T11:18:59Zhttp://cds.cern.ch/record/2707141engJensen, Jesper HalkjaerExperimental study of $^{10}$​Li with low energy (d,p) reactionsNuclear Physics - ExperimentNuclear Physics - TheoryIn this thesis, I present the results from three experiments studying the structure of $^{10}$Li through neutron transfer reactions at different beam energies. All three experiments were performed at the ISOLDE facility at CERN with a radioactive $^{9}$Li beam impinging on deuterated plastic. The results of the elastic channels are compared with OM and CDCC calculations. The result of the neutron transfer reactions is compared with CDCC calculations using a novel structure model of $^{10}$Li. The first experiment was carried out at 2.68 MeV/A in 2005 and give evidence for the existence of a virtual $s$$_{1/2}$ state in $^{10}$Li. Furthermore, it confirms the position of a $p$$_{1/2}$ resonance close to 0.5MeV. Coincidences between protons and $^{9}$Li, from the break up of $^{9}$Li, provides evidence for a sequential reaction model, however, the applied model can not account for the magnitude of the measured cross sections. In the second and third experiment at 6.72 MeV/A and 8.0 MeV/A, respectively, there are indications for a higher-lying $d$$_{5/2}$ resonance, however, this result is more speculative. The model also struggles to reproduce the absolute cross sections at these energies. Besides the results from the experiments, I present some of the technical methods that have been used and developed during the experiments and data analysis. This includes the data acquisition system and a general-purpose library for experiments with silicon detectors, AUSAlib. Moreover, the kinematic considerations that go into both the design and the analysis phase are discussed. Two techniques to determine beam properties are discussed. One is based on coincidences and mainly discussed through simulations whereas the other is based on only the ejectile of a two-body reaction. A Monte Carlo method for transforming measurements into absolute cross sections presented as well.CERN-THESIS-2019-274oai:cds.cern.ch:27071412020-01-24T12:31:56Z
spellingShingle Nuclear Physics - Experiment
Nuclear Physics - Theory
Jensen, Jesper Halkjaer
Experimental study of $^{10}$​Li with low energy (d,p) reactions
title Experimental study of $^{10}$​Li with low energy (d,p) reactions
title_full Experimental study of $^{10}$​Li with low energy (d,p) reactions
title_fullStr Experimental study of $^{10}$​Li with low energy (d,p) reactions
title_full_unstemmed Experimental study of $^{10}$​Li with low energy (d,p) reactions
title_short Experimental study of $^{10}$​Li with low energy (d,p) reactions
title_sort experimental study of $^{10}$​li with low energy (d,p) reactions
topic Nuclear Physics - Experiment
Nuclear Physics - Theory
url http://cds.cern.ch/record/2707141
work_keys_str_mv AT jensenjesperhalkjaer experimentalstudyof10liwithlowenergydpreactions