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Spectral statistics and the fine structure of the electric pygmy dipole resonance in N=82 nuclei

Enders, J; Guhr, Thomas LU ; Heine, A; von Neumann-Cosel, P; Ponomarev, VY; Richter, A and Wambach, J (2004) In Nuclear Physics, Section A 741. p.3-28
Abstract
We study the statistical properties of the electric pygmy dipole resonance in four different isotones with neutron number N = 82. These nuclei are Ba-138(56), Ce-140(58), Nd-142(60), (144)(62)sm. The data set comprises levels with spin and parity J(pi) = 1(-) and their ground state B(E1) transition strengths. The statistics are found to be "mixed", i.e., in between the predictions of random matrix theory for correlated and uncorrelated spectra. Moreover, we calculate spectra and transition strengths in the quasiparticle phonon model (QPM). We compare experimental and theoretical findings. The incompleteness of the data sets and its impact on the results is discussed. A consistent picture emerges which yields an improved understanding of... (More)
We study the statistical properties of the electric pygmy dipole resonance in four different isotones with neutron number N = 82. These nuclei are Ba-138(56), Ce-140(58), Nd-142(60), (144)(62)sm. The data set comprises levels with spin and parity J(pi) = 1(-) and their ground state B(E1) transition strengths. The statistics are found to be "mixed", i.e., in between the predictions of random matrix theory for correlated and uncorrelated spectra. Moreover, we calculate spectra and transition strengths in the quasiparticle phonon model (QPM). We compare experimental and theoretical findings. The incompleteness of the data sets and its impact on the results is discussed. A consistent picture emerges which yields an improved understanding of the statistical properties of the pygmy resonance. ( (Less)
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organization
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Contribution to journal
publication status
published
subject
keywords
pygmy dipole resonance strength distributions, Sm-144, Nd-142, Ce-140, nuclear structure Ba-138, analyzed electric, level density, deduced, statistical properties, quasiparticle phonon model calculations
in
Nuclear Physics, Section A
volume
741
pages
3 - 28
publisher
Elsevier
external identifiers
  • wos:000223376400001
  • scopus:4043102685
ISSN
0375-9474
DOI
10.1016/j.nuclphysa.2004.05.014
language
English
LU publication?
yes
id
a979829d-3b51-44b8-9176-36cdb8f685ac (old id 269442)
date added to LUP
2007-10-22 08:29:22
date last changed
2017-08-20 04:34:51
@article{a979829d-3b51-44b8-9176-36cdb8f685ac,
  abstract     = {We study the statistical properties of the electric pygmy dipole resonance in four different isotones with neutron number N = 82. These nuclei are Ba-138(56), Ce-140(58), Nd-142(60), (144)(62)sm. The data set comprises levels with spin and parity J(pi) = 1(-) and their ground state B(E1) transition strengths. The statistics are found to be "mixed", i.e., in between the predictions of random matrix theory for correlated and uncorrelated spectra. Moreover, we calculate spectra and transition strengths in the quasiparticle phonon model (QPM). We compare experimental and theoretical findings. The incompleteness of the data sets and its impact on the results is discussed. A consistent picture emerges which yields an improved understanding of the statistical properties of the pygmy resonance. (},
  author       = {Enders, J and Guhr, Thomas and Heine, A and von Neumann-Cosel, P and Ponomarev, VY and Richter, A and Wambach, J},
  issn         = {0375-9474},
  keyword      = {pygmy dipole resonance strength distributions,Sm-144,Nd-142,Ce-140,nuclear structure Ba-138,analyzed electric,level density,deduced,statistical properties,quasiparticle phonon model calculations},
  language     = {eng},
  pages        = {3--28},
  publisher    = {Elsevier},
  series       = {Nuclear Physics, Section A},
  title        = {Spectral statistics and the fine structure of the electric pygmy dipole resonance in N=82 nuclei},
  url          = {http://dx.doi.org/10.1016/j.nuclphysa.2004.05.014},
  volume       = {741},
  year         = {2004},
}