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Nuclear Experiment

arXiv:nucl-ex/0512027 (nucl-ex)
[Submitted on 20 Dec 2005]

Title:Pygmy dipole strength close to particle-separation energies - the case of the Mo isotopes

Authors:Gencho Rusev, Eckart Grosse, Martin Erhard, Arnd Junghans, Krasimir Kosev, Klaus-Dieter Schilling, Ronald Schwengner, Andreas Wagner
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Abstract: The distribution of electromagnetic dipole strength in 92, 98, 100 Mo has been investigated by photon scattering using bremsstrahlung from the new ELBE facility. The experimental data for well separated nuclear resonances indicate a transition from a regular to a chaotic behaviour above 4 MeV of excitation energy. As the strength distributions follow a Porter-Thomas distribution much of the dipole strength is found in weak and in unresolved resonances appearing as fluctuating cross section. An analysis of this quasi-continuum - here applied to nuclear resonance fluorescence in a novel way - delivers dipole strength functions, which are combining smoothly to those obtained from (g,n)-data. Enhancements at 6.5 MeV and at ~9 MeV are linked to the pygmy dipole resonances postulated to occur in heavy nuclei.
Comments: 6 pages, 5 figures, proceedings Nuclear Physics in Astrophysics II, May 16-20, Debrecen, Hungary. The original publication is available at this http URL
Subjects: Nuclear Experiment (nucl-ex)
Cite as: arXiv:nucl-ex/0512027
  (or arXiv:nucl-ex/0512027v1 for this version)
  https://doi.org/10.48550/arXiv.nucl-ex/0512027
Related DOI: https://doi.org/10.1140/epja/i2006-08-025-6

Submission history

From: Gencho Rusev [view email]
[v1] Tue, 20 Dec 2005 11:29:21 UTC (111 KB)
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