CaltechTHESIS
  A Caltech Library Service

Electromagnetic decay of the 1.7- and 2.43-MeV levels in ^9Be

Citation

Purdom, Paul Walton (1966) Electromagnetic decay of the 1.7- and 2.43-MeV levels in ^9Be. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/DAB0-KN61. https://resolver.caltech.edu/CaltechTHESIS:10192015-131229028

Abstract

The 1.7- and 2.43-MeV levels in 9Be were populated with the reaction 11B(d, α)9Be* by bombarding thin boron on carbon foils with 1.7-MeV deuterons. The alpha particles were analyzed in energy with a surface-barrier counter set at the unique kinematically determined angle and the recoiling 9Be nuclei at 90o were analyzed in rigidity with a magnetic spectrometer, in energy by a surface-barrier counter at the spectrometer focus, and in velocity by the time delay between an alpha and a 9Be count. When a pulse from the spectrometer counter was in the appropriate delayed coincidence with a pulse from the alpha counter, the two pulses were recorded in a two-dimensional pulse height analyzer. Most of the 9Be* decay by particle breakup. Only those that gamma decay are detected by the spectrometer counter. Thus the experiment provides a direct measurement of Γrad/Γ. Analysis of 384 observed events gives Γrad/Γ = (1.16 ± 0.14) X 10-4 for the 2.43-MeV level. Combining this ratio with the value of Γrad = 0.122 ± 0.015 eV found from inelastic electron scattering gives Γ = (1.05 ± 0.18) keV. For the 1.7-MeV level, an upper limit, Γrad/Γ ≤ 2.4 = 10-5, was determined.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Physics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Kavanagh, Ralph William
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1966
Record Number:CaltechTHESIS:10192015-131229028
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:10192015-131229028
DOI:10.7907/DAB0-KN61
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9228
Collection:CaltechTHESIS
Deposited By: Leslie Granillo
Deposited On:27 Oct 2015 15:58
Last Modified:21 Dec 2019 02:32

Thesis Files

[img]
Preview
PDF - Final Version
See Usage Policy.

12MB

Repository Staff Only: item control page