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Title: The decay pattern of the Pygmy Dipole Resonance of 140Ce

Abstract

The decay properties of the Pygmy Dipole Resonance (PDR) have been investigated in the semi-magic N = 82 nucleus 140Ce using a novel combination of nuclear resonance fluorescence and γ–γ coincidence techniques. Branching ratios for transitions to low-lying excited states are determined in a direct and model-independent way both for individual excited states and for excitation energy intervals. Comparison of the experimental results to microscopic calculations in the quasi-particle phonon model exhibits an excellent agreement, supporting the observation that the Pygmy Dipole Resonance couples to the ground state as well as to low-lying excited states. In conclusion, a 10% mixing of the PDR and the [21+ × PDR] is extracted.

Authors:
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Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1556159
Alternate Identifier(s):
OSTI ID: 1378506
Report Number(s):
LLNL-JRNL-695021
Journal ID: ISSN 0370-2693; S0370269316001386; PII: S0370269316001386
Grant/Contract Number:  
FG02-91ER-40609; FG02-97ER-41033; AC52-07NA27344
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 756 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; γ-ray spectroscopy; 140Ce; Pygmy Dipole Resonance; Nuclear resonance fluorescence; Coincidence measurement; Quasi-particle phonon model

Citation Formats

Löher, B., Savran, D., Aumann, T., Beller, J., Bhike, M., Cooper, N., Derya, V., Duchêne, M., Endres, J., Hennig, A., Humby, P., Isaak, J., Kelley, J. H., Knörzer, M., Pietralla, N., Ponomarev, V. Yu., Romig, C., Scheck, M., Scheit, H., Silva, J., Tonchev, A. P., Tornow, W., Wamers, F., Weller, H., Werner, V., and Zilges, A. The decay pattern of the Pygmy Dipole Resonance of 140Ce. Netherlands: N. p., 2016. Web. doi:10.1016/j.physletb.2016.02.042.
Löher, B., Savran, D., Aumann, T., Beller, J., Bhike, M., Cooper, N., Derya, V., Duchêne, M., Endres, J., Hennig, A., Humby, P., Isaak, J., Kelley, J. H., Knörzer, M., Pietralla, N., Ponomarev, V. Yu., Romig, C., Scheck, M., Scheit, H., Silva, J., Tonchev, A. P., Tornow, W., Wamers, F., Weller, H., Werner, V., & Zilges, A. The decay pattern of the Pygmy Dipole Resonance of 140Ce. Netherlands. doi:10.1016/j.physletb.2016.02.042.
Löher, B., Savran, D., Aumann, T., Beller, J., Bhike, M., Cooper, N., Derya, V., Duchêne, M., Endres, J., Hennig, A., Humby, P., Isaak, J., Kelley, J. H., Knörzer, M., Pietralla, N., Ponomarev, V. Yu., Romig, C., Scheck, M., Scheit, H., Silva, J., Tonchev, A. P., Tornow, W., Wamers, F., Weller, H., Werner, V., and Zilges, A. Sun . "The decay pattern of the Pygmy Dipole Resonance of 140Ce". Netherlands. doi:10.1016/j.physletb.2016.02.042.
@article{osti_1556159,
title = {The decay pattern of the Pygmy Dipole Resonance of 140Ce},
author = {Löher, B. and Savran, D. and Aumann, T. and Beller, J. and Bhike, M. and Cooper, N. and Derya, V. and Duchêne, M. and Endres, J. and Hennig, A. and Humby, P. and Isaak, J. and Kelley, J. H. and Knörzer, M. and Pietralla, N. and Ponomarev, V. Yu. and Romig, C. and Scheck, M. and Scheit, H. and Silva, J. and Tonchev, A. P. and Tornow, W. and Wamers, F. and Weller, H. and Werner, V. and Zilges, A.},
abstractNote = {The decay properties of the Pygmy Dipole Resonance (PDR) have been investigated in the semi-magic N = 82 nucleus 140Ce using a novel combination of nuclear resonance fluorescence and γ–γ coincidence techniques. Branching ratios for transitions to low-lying excited states are determined in a direct and model-independent way both for individual excited states and for excitation energy intervals. Comparison of the experimental results to microscopic calculations in the quasi-particle phonon model exhibits an excellent agreement, supporting the observation that the Pygmy Dipole Resonance couples to the ground state as well as to low-lying excited states. In conclusion, a 10% mixing of the PDR and the [21+ × PDR] is extracted.},
doi = {10.1016/j.physletb.2016.02.042},
journal = {Physics Letters B},
number = C,
volume = 756,
place = {Netherlands},
year = {2016},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2016.02.042

Citation Metrics:
Cited by: 12 works
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Figures / Tables:

FIG. 1. FIG. 1.: Measured energy spectra for 140Ce at a beam energy of 6.5MeV with simplified level schemes indicating the transition (bold arrows). (a) Singles spectra from HPGe detectors shown in gray together with spectral distribution of the photon beam (dashed). Squares indicate values for the photon flux determination from isolatedmore » transitions used for N$γ$ determination. (b) Coincidence spectrum to the 2$^+_ 1$ →0$^+_ 1$ transition observed in the LaBr detector array. Error bars indicate the statistical uncertainty. The black spectrum represents the background from applying a cut on a slightly higher energy (see text).« less

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Works referencing / citing this record:

Study of photon strength functions via ( γ → , γ ′ , γ ″ ) reactions at the γ 3 -setup
journal, January 2018


Electric and magnetic dipole modes in high-resolution inelastic proton scattering at 0°
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The decay pattern of the Pygmy Dipole Resonance of $^{140}$Ce
text, January 2016

  • Löher, B.; Savran, D.; Aumann, T.
  • GSI Helmholtzzentrum fuer Schwerionenforschung, GSI, Darmstadt
  • DOI: 10.15120/gsi-2017-00135

Study of photon strength functions via ( γ → , γ ′ , γ ″ ) reactions at the γ 3 -setup
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Electric and magnetic dipole modes in high-resolution inelastic proton scattering at 0°
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Test of the Brink-Axel Hypothesis for the Pygmy Dipole Resonance
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Reference database for photon strength functions
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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.