Threshold photoneutron angular distribution and polarization studies of nuclei
Description
The photoneutron method was applied to the study of: (1) deuteron photodisintegration; (2) giant magnetic dipole resonances in heavy nuclei; (3) mechanism of radiative capture in light nuclei; and (4) isospin splitting of the giant dipole resonance in /sup 60/Ni. These studies were performed with the pulsed bremsstrahlung beam and high-resolution spectrometer available at the Argonne high-current electron linac. A threshold photoneutron polarization method was developed in order to search for the giant M1 resonance in heavy nuclei. A surprisingly small amount of M1 strength was found in /sup 208/Pb. Furthermore, the M1 strength for the 5.08-MeV excitation in /sup … continued below
Physical Description
9 pages
Creation Information
Holt, R.J. January 1, 1980.
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Argonne National Laboratory
Publisher Info: Argonne National Lab., IL (USA)Place of Publication: Illinois
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Description
The photoneutron method was applied to the study of: (1) deuteron photodisintegration; (2) giant magnetic dipole resonances in heavy nuclei; (3) mechanism of radiative capture in light nuclei; and (4) isospin splitting of the giant dipole resonance in /sup 60/Ni. These studies were performed with the pulsed bremsstrahlung beam and high-resolution spectrometer available at the Argonne high-current electron linac. A threshold photoneutron polarization method was developed in order to search for the giant M1 resonance in heavy nuclei. A surprisingly small amount of M1 strength was found in /sup 208/Pb. Furthermore, the M1 strength for the 5.08-MeV excitation in /sup 17/O, the best example of a single-particle M1 resonance in nuclei, was found to be strongly quenched. In addition, the /sup 17/O(..gamma..,n/sub 0/)/sup 16/O reaction was found to provide an ideal example of the Lane-Lynn theory of radiative capture. The interplay among the three components of the theory, internal, channel and potential capture, were evident from the data. An electron beam transport system was developed which allows the bremsstrahlung to impinge on the photoneutron target on an axis perpendicular to the usual reaction plane. This system provides an accurate method for the measurement of relative angular distributions in (..gamma..,n) reactions. This system was applied to a high-accuracy measurement of the relative angular distribution for the D(..gamma..,n)H reaction. The question of isospin-splitting of the giant dipole resonance in /sup 60/Ni was studied by using the unique pico-pulse from the accelerator and the newly installed 25-m, neutron flight paths. The results provide clear evidence for the effect of isospin splitting.
Physical Description
9 pages
Notes
NTIS, PC A02/MF A01.
Subjects
Keywords
- Baryons
- Beta Decay Radioisotopes
- Cross Sections
- Data
- Distribution
- Electron Capture Radioisotopes
- Elementary Particles
- Elements
- Energy Levels
- Even-Even Nuclei
- Even-Odd Nuclei
- Fermions
- Giant Resonance
- Hadrons
- Heavy Nuclei
- Information
- Intermediate Mass Nuclei
- Isomeric Transition Isotopes
- Isotopes
- Lead 208
- Lead 208 Target
- Lead Isotopes
- Light Nuclei
- Neutrons
- Nickel 60
- Nickel 60 Target
- Nickel Isotopes
- Nonmetals
- Nuclear Reactions
- Nuclei
- Nucleons
- Numerical Data
- Oxygen 17
- Oxygen 17 Target
- Oxygen Isotopes
- Photoneutrons
- Photonuclear Reactions
- Photonucleons
- Radioisotopes
- Resonance
- Seconds Living Radioisotopes
- Stable Isotopes
- Targets
- Years Living Radioisotopes 651925* -- Nuclear Properties & Reactions, A=190-219, Experimental-- Nuclear Reactions & Scattering-- (-1987)
STI Subject Categories
- 651225 -- Nuclear Properties & Reactions, A=1-5, Experimental-- Nuclear Reactions & Scattering-- (-1987)
- 651323 -- Nuclear Properties & Reactions, A=6-19, Experimental-- Energy Levels & Transitions-- (-1987)
- 651325 -- Nuclear Properties & Reactions, A=6-19, Experimental-- Nuclear Reactions & Scattering-- (-1987)
- 651523 -- Nuclear Properties & Reactions, A=39-58, Experimental-- Energy Levels & Transitions-- (-1987)
- 651525 -- Nuclear Properties & Reactions, A=39-58, Experimental-- Nuclear Reactions & Scattering-- (-1987)
- 651923 -- Nuclear Properties & Reactions, A=190-219, Experimental-- Energy Levels & Transitions-- (-1987)
- 73 Nuclear Physics And Radiation Physics
Source
- 6. conference on application of accelerators in research and industry, Denton, TX, USA, Nov 1980
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- Other: DE81023724
- Report No.: CONF-801111-48
- Grant Number: W-31-109-ENG-38
- Office of Scientific & Technical Information Report Number: 6438413
- Archival Resource Key: ark:/67531/metadc1212299
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- January 1, 1980
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- July 5, 2018, 11:11 p.m.
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- June 7, 2019, 1:36 p.m.
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Holt, R.J. Threshold photoneutron angular distribution and polarization studies of nuclei, article, January 1, 1980; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1212299/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.