Bunching, cooling, and measuring of radioactive isotopes for nuclear physics
department or school: Science, Faculty of
department or school: Physics and Astronomy, Department of
data provider: DSpace
degree campus: UBCV
creator: Bale, Jeffrey Charles
issued: 2016-04-15T03:16:44
issued: 2016
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: TRIUMF is currently undergoing a major expansion of its capabilities to produce exotic ion beams for experiments. In this thesis, I review a portion of the new infrastructure that I helped to design, the CANadian Rare-isotope facility with Electron-Beam ion source’s Radio Frequency Quadrupole buncher and cooler. The portion that I was responsible for was the injection optics into this buncher and cooler. The studies found a solution to exceed the acceptance requirements of the device, 15 mm mrad by a factor of five, resulting in an acceptance of 67±7 mm mrad for masses of ions as low as 15 AMU, as well as 72±7 mm mrad for masses above 30 AMU. These results came about from simulating both the length of a tapered region in the injection optics, as well as the angle of the taper region with respect to the beam axis The optimal design of the tapered region was have a length of 50 mm at an angle of 4⁰. In addition to these simulations, energy spread investigations were conducted. These studies resulted in a maximum loss of 14% of the acceptance of the device when the delivered beam has an energy spread of 25%. In addition to the design of the injection optics for the buncher and cooler, mass measurements of several short-lived isotopes at Triumf’s Ion Trap for Atomic and Nuclear science were analysed. All of the investigated masses have reduced uncertainties when compared to previous values in the Atomic Mass Evaluation of 2012. Mass excesses for ³¹ ³²Na were found to be 12246(14) keV and 18638(37) keV, respectively, with uncertainties being half of the smallest of those currently published in AME. Mass excess of ²⁹ ³⁴ ³⁵Al were shown to be -18207.77(37) keV, -3000.5(29) keV, and -223.7(73) keV. The mass excess of ³⁴Al has also confirmed the two-neutron separation energy cross over with ³³Mg to be 15(10) keV at a N=21. These nuclear physics studies are discussed in context of the so-called island of inversion and nuclear correlation energy.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/57605
note: Bunching, Cooling, and Measuring of Radioactive Isotopesfor Nuclear PhysicsbyJeffrey Charles BaleBSc, Applied Physics, Simon Fraser University 2014A THESIS SUBMITTED IN PARTIAL FULFILLMENTOF THE REQUIREMENTS FOR THE DEGREE OFMaster of ScienceinTHE FACULTY OF GRADUATE AND POSTDOCTORALSTUDIES(Physics)The University of British Columbia(Vancouver)April 2016c© Jeffrey Charles Bale, 2016AbstractTRIUMF is currently undergoing a major expansion of its capabilities to pro-duce exotic ion beams for experiments. In this thesis, I review a portion of thenew infrastructure that I helped to design, the CANadian Rare-isotope facilitywith Electron-Beam ion source’s Radio Frequency Quadrupole buncher and cooler.The portion that I was responsible for was the injection optics into this buncherand cooler. The studies found a solution to exceed the acceptance requirementsof the device, 15 mm mrad by a factor of five, resulting in an acceptance of67±7 mm mrad for masses of ions as low as 15 AMU, as well as 72 ±7 mm mradfor masses above 30 AMU. These results came about from simulating both thelength of a tapered region in the injection optics, as well as the angle of the taperregion with respect to the beam axis The optimal design of the tapered region washave a length of 50 mm at an angle of 4◦. In addition to these simulations, energyspread investigations were conducted. These studies resulted in a maximum loss of14% of the acceptance of the device when the delivered beam has an energy spreadof 25%.In addition to the design of the injection optics for the buncher and cooler,mass measurements of several short-lived isotopes at Triumf’s Ion Trap for Atomicand Nuclear science were analysed. All of the investigated masses have reduceduncertainties when compared to previous values in the Atomic Mass Evaluation of2012. Mass excesses for 31,32Na were found to be 12246(14) keV and 18638(37)keV, respectively, with uncertainties being half of the smallest of those currentlypublished in AME. Mass …
has type: Thesis/Dissertation
date issued: 2015-05
is shown at: 10.14288/1.0300657
language: eng
degree discipline: Physics
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/57605