Proton Induced Pion Production from Light Nuclei in the Region of the a ∆₁₂₃₂ Resonance
department or school: Non UBC
data provider: DSpace
contributor: TRIUMF
creator: Huber, Garth Murray
issued: 2019-03-06T18:52:31Z
issued: 1988-02-18
description: Proton induced pion production has been investigated in a series of experiments using the Medium Resolution Spectrometer at TRIUMF. Data were obtained for the ⁷Li(p̄, π⁺)⁸Li*, ¹²C(p, π⁺)¹³C*, ¹³C(p, π⁻)¹⁴O*, ¹³C(p, π⁺)¹⁴C*, and ¹⁶O(p̄, π⁺)¹⁷O* reactions at Tp = 250 , 354 and 489 MeV, and are compared with previously published results taken at other energies above and below the ∆₁₂₃₂ resonance region. Because the signatures of the ∆₁₂₃₂ resonance should be the least ambiguous in this energy range, theoretical calculations which include ∆₁₂₃₂ degrees of freedom should be able to describe these results, if they are to have any hope at describing the experimental situation at all. At fixed four-momentum transfers squared of t > 0.45 GeV²/c², the (p, π⁺) differential cross sections exhibit a maximum near the invariant mass of the ∆₁₂₃₂. This energy dependence is similar to that shown by the pp → dπ⁺ reaction at equivalent center of mass energy and four-momentum transfer squared, and thus it provides strong evidence of a NN →NNπ⁺ process in the (p, π⁺) reaction mechanism. Unlike the (p, π⁺) reactions, the differential cross sections of the (p, π⁻) reactions decrease with increasing energy through this region. This difference is consistent with an interpretation of the (p, π⁻) reaction mechanism as a NN → NN π⁻ process in which non-resonant amplitudes are dominant in this region. Analyzing power angular distributions for many states of the ⁷Li(p̄, π⁺)⁸Li* and ¹⁶O(p̄, π⁺)¹⁷O* reactions exhibit broad similarities with those of the p̄p → dπ⁺ reaction. Interpretation of this trend is complicated by other analyzing power angular distributions which have entirely different shapes. Data were also obtained for the inclusive pion production reactions to the continuum. Double differential cross sections display an energy dependence similar to that of the pp → dπ⁺ reaction, and analyzing power angular distributions are similar to those of the p̄p → dπ⁺ reaction. This is consistent wi…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/68500
note: Proton Induced Pion Production from Light Nuclei in the Region of the a 1232 Resonance Garth Murray Huber A Thesis Submitted to the Faculty of Graduate Studies and Research in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in Physics Faculty of Science University of Regina February 18, 1988 © Garth M. Huber , 1988. UNIVERSITY OF REGINA FACULTY OF GRADUATE STUDIES AND RESEARCH CERTIFICATION F THESIS WORK We, the undersigned, certify that Garth Murray Huber, candidate for the Degree of Doctor of Philosophy has presented a thesis on "Proton Induced Pion Production from Light Nuclei in the Region of the A 1232 Resonance", that the thesis is acceptable in form and content, and that the student demonstrated a satisfactory knowledge of the field covered by the thesis in an oral examination held on February 9, 1988. External Examiner: Dr. B.M.K. Nefkens, Internal Examiners: U c//~ Dr. G.J. Lolos, Co-Supervisor Dr. S.I.H. Naqvi, Co-Supervisor UNIVERSITY OF REGINA FACULTY OF GRADUATE STUDIES AND RESEARCH PERMISSION TO USE POSTGRADUATE THESES TITLE OF THESIS: Proton Induced Pion Production from Light Nuclei in the Region of the a 1232 Resonance NAME OF AUTHOR: Garth Murray Huber FACULTY: Faculty of Graduate Studies and Research DEGREE: Doctor of Philosophy In presenting this thesis in partial fulfilment of the requirements for a postgraduate degree from the University of Regina, .I agree that the Libraries of this University shall make it freely available for inspection. I further agree that permission for extensive copying of thi s thesis for scholarly purposes may be granted by the professor or profes sors who supervised my thesis work, or in their absence, by the Head of the Department or the Dean of the Faculty in which my thesis work was done. I t is understood that any copying, publication or use of this thesis or part s thereof for financial gain shall not be allowed without my written permission. It is also under-stood that due recogniti…
has type: Thesis/Dissertation
is shown at: 10.14288/1.0376643
language: eng
peer review status: Unreviewed
provider: Vancouver : University of British Columbia Library
publisher: TRIUMF
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/2429/68500