The 3 MeV pygmy resonance in 163,164 Dy
15
The 3 MeV pygmy resonance in 163,164 Dy Hilde-Therese Nyhus Department of Physics University of Oslo
description
The 3 MeV pygmy resonance in 163,164 Dy. Hilde-Therese Nyhus. Department of Physics University of Oslo. Introduction Motivation for analyzing these nuclei Experimental method Level density Gamma-ray strength function. Motivation. Motivation. Various other rare earth nuclei - PowerPoint PPT Presentation
Transcript of The 3 MeV pygmy resonance in 163,164 Dy
The 3 MeV pygmy resonance in 163,164Dy
The 3 MeV pygmy resonance in 163,164Dy
Hilde-Therese Nyhus
Department of Physics University of Oslo
Introduction Motivation for analyzing these nuclei Experimental method Level density Gamma-ray strength function
Introduction Motivation for analyzing these nuclei Experimental method Level density Gamma-ray strength function
MotivationMotivation
MotivationMotivationVarious other rare earth nucleihave been studied using theOslo method, one has then measured a width of the pygmyresonance between 1.2-1.5 MeV. This contradicts what has been measured in Prague for other rare earth nuclei, where abouthalf the width has been found.
The reactions used to produce the nucleiThe reactions used to produce the nuclei
The reactions used to produce the nucleiThe reactions used to produce the nuclei
At Oslo Cyclotron Laboratory: At Oslo Cyclotron Laboratory:
164Dy(3He, 3He*)164Dy164Dy(3He, )163Dy
The reactions used to produce the nucleiThe reactions used to produce the nuclei
At Oslo Cyclotron Laboratory: At Oslo Cyclotron Laboratory:
164Dy(3He, 3He*)164Dy164Dy(3He, )163Dy
In Prague:
162Dy(n, )163Dy
Experimental methodExperimental method-Gate on the various particles to construct coincidence matrix.
Coincidence matrixesCoincidence matrixes
163Dy 164Dy
Experimental methodExperimental method-Gate on the various particles to construct coincidence matrix.
-Unfold the gamma spectrum and generate first generation matrix.
First generation matrixesFirst generation matrixes
163Dy 164Dy
Experimental methodExperimental method-Gate on the various particles to construct coincidence matrix.
-Unfold the gamma spectrum and generate first generation matrix.
-The experimentally obtained first generation matrix is according to the Brink-Axel hypothesis proportional to the level density and gamma ray strength function.
€
P(Ex,Eγ )∝T(Eγ )ρ(Ex,Eγ )
Level density in 163,164Dy Level density in 163,164Dy
PreliminaryPreliminary
163Dy 164Dy
Gamma-ray strength function with pygmy resonanceGamma-ray strength function with pygmy resonance
Gamma-ray strength function in 164Dy, with a pygmy resonance.
Gamma-ray strength function in 164Dy, with a pygmy resonance.
Gamma-ray strength function in 163Dy, with a pygmy resonance.
The width of the pygmy resconance masured in Prague is 0.6 MeV
163Dy 164Dy
PreliminaryPreliminary
Gamma-ray strength function with pygmy resonanceGamma-ray strength function with pygmy resonance
Gamma-ray strength function in 163Dy, with a pygmy resonance.
The width of the pygmy resconance masured in Prague is 0.6 MeV
163Dy
PreliminaryPreliminary
