The 3 MeV pygmy resonance in 163,164 Dy Hilde-Therese Nyhus Department of Physics University of...
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Transcript of The 3 MeV pygmy resonance in 163,164 Dy Hilde-Therese Nyhus Department of Physics University of...
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The 3 MeV pygmy resonance in 163,164Dy
Hilde-Therese Nyhus
Department of Physics University of Oslo
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Introduction Motivation for analyzing these nuclei Experimental method Level density Gamma-ray strength function
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Motivation
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MotivationVarious 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.
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The reactions used to produce the nuclei
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The reactions used to produce the nuclei
At Oslo Cyclotron Laboratory:
164Dy(3He, 3He*)164Dy164Dy(3He, )163Dy
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The reactions used to produce the nuclei
At Oslo Cyclotron Laboratory:
164Dy(3He, 3He*)164Dy164Dy(3He, )163Dy
In Prague:162Dy(n, )163Dy
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Experimental method-Gate on the various particles to construct coincidence matrix.
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Coincidence matrixes
163Dy 164Dy
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Experimental method-Gate on the various particles to construct coincidence matrix.
-Unfold the gamma spectrum and generate first generation matrix.
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First generation matrixes
163Dy 164Dy
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Experimental 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.
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P(E x,Eγ )∝T(Eγ )ρ(E x,Eγ )
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Level density in 163,164Dy
Preliminary
163Dy 164Dy
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Gamma-ray strength function with 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
Preliminary
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Gamma-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
Preliminary