Giant dipole resonance studies in Ba isotopes at E/A≈5 MeV

Giant dipole resonance studies in Ba isotopes at E/A≈5 MeV Exclusive measurements of high-energy γ rays have been performed in Ba124 and Ba136 at the same excitation energy (∼49MeV) to study the properties of the giant dipole resonance (GDR) over a wide N/Z range. The high-energy γ rays are measured in coincidence with the multiplicity of low-energy γ rays to disentangle the effect of temperature (T) and angular momentum (J). The GDR parameters are extracted employing a simulated Monte Carlo statistical model analysis. The observed γ-ray spectra of Ba124 can be explained with prolate deformation, whereas a single-component Lorentzian function which corresponds to a spherical shape could explain the γ-ray spectra of Ba136. The observed GDR width in Ba136 is narrower compared to that of Ba124. The statistical model best-fit GDR cross sections are found to be in reasonable agreement with the thermal shape fluctuation model (TSFM) calculations. Further, it is shown that the variation of GDR width with T is well reproduced by the TSFM calculations over the temperature range of 1.1–1.7 MeV. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review C American Physical Society (APS)

Giant dipole resonance studies in Ba isotopes at E/A≈5 MeV

Abstract

Exclusive measurements of high-energy γ rays have been performed in Ba124 and Ba136 at the same excitation energy (∼49MeV) to study the properties of the giant dipole resonance (GDR) over a wide N/Z range. The high-energy γ rays are measured in coincidence with the multiplicity of low-energy γ rays to disentangle the effect of temperature (T) and angular momentum (J). The GDR parameters are extracted employing a simulated Monte Carlo statistical model analysis. The observed γ-ray spectra of Ba124 can be explained with prolate deformation, whereas a single-component Lorentzian function which corresponds to a spherical shape could explain the γ-ray spectra of Ba136. The observed GDR width in Ba136 is narrower compared to that of Ba124. The statistical model best-fit GDR cross sections are found to be in reasonable agreement with the thermal shape fluctuation model (TSFM) calculations. Further, it is shown that the variation of GDR width with T is well reproduced by the TSFM calculations over the temperature range of 1.1–1.7 MeV.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
0556-2813
eISSN
1089-490X
D.O.I.
10.1103/PhysRevC.96.014309
Publisher site
See Article on Publisher Site

Abstract

Exclusive measurements of high-energy γ rays have been performed in Ba124 and Ba136 at the same excitation energy (∼49MeV) to study the properties of the giant dipole resonance (GDR) over a wide N/Z range. The high-energy γ rays are measured in coincidence with the multiplicity of low-energy γ rays to disentangle the effect of temperature (T) and angular momentum (J). The GDR parameters are extracted employing a simulated Monte Carlo statistical model analysis. The observed γ-ray spectra of Ba124 can be explained with prolate deformation, whereas a single-component Lorentzian function which corresponds to a spherical shape could explain the γ-ray spectra of Ba136. The observed GDR width in Ba136 is narrower compared to that of Ba124. The statistical model best-fit GDR cross sections are found to be in reasonable agreement with the thermal shape fluctuation model (TSFM) calculations. Further, it is shown that the variation of GDR width with T is well reproduced by the TSFM calculations over the temperature range of 1.1–1.7 MeV.

Journal

Physical Review CAmerican Physical Society (APS)

Published: Jul 13, 2017

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