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Nuclear deformation and neutron excess as competing effects for pygmy dipole strength

Publication ,  Journal Article
Massarczyk, R; Schwengner, R; Dönau, F; Frauendorf, S; Anders, M; Bemmerer, D; Beyer, R; Bhatia, C; Birgersson, E; Butterling, M; Elekes, Z ...
November 8, 2013

The electromagnetic dipole strength below the neutron-separation energy has been studied for the xenon isotopes with mass numbers A = 124, 128, 132, and 134 in nuclear resonance fluorescence experiments using the ELBE bremsstrahlung facility at Helmholtz-Zentrum Dresden-Rossendorf and the HIgS facility at Triangle Universities Nuclear Laboratory Durham. The systematic study gained new information about the influence of the neutron excess as well as of nuclear deformation on the strength in the region of the pygmy dipole resonance. The results are compared with those obtained for the chain of molybdenum isotopes and with predictions of a random-phase approximation in a deformed basis. It turned out that the effect of nuclear deformation plays a minor role compared with the one caused by neutron excess. A global parametrization of the strength in terms of neutron and proton numbers allowed us to derive a formula capable of predicting the summed E1 strengths in the pygmy region for a wide mass range of nuclides.

Duke Scholars

Publication Date

November 8, 2013

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

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Massarczyk, R., Schwengner, R., Dönau, F., Frauendorf, S., Anders, M., Bemmerer, D., … Wagner, A. (2013). Nuclear deformation and neutron excess as competing effects for pygmy dipole strength.
Massarczyk, R., R. Schwengner, F. Dönau, S. Frauendorf, M. Anders, D. Bemmerer, R. Beyer, et al. “Nuclear deformation and neutron excess as competing effects for pygmy dipole strength,” November 8, 2013.
Massarczyk R, Schwengner R, Dönau F, Frauendorf S, Anders M, Bemmerer D, et al. Nuclear deformation and neutron excess as competing effects for pygmy dipole strength. 2013 Nov 8;
Massarczyk R, Schwengner R, Dönau F, Frauendorf S, Anders M, Bemmerer D, Beyer R, Bhatia C, Birgersson E, Butterling M, Elekes Z, Ferrari A, Gooden ME, Hannaske R, Junghans AR, Kempe M, Kelley JH, Kögler T, Matic A, Menzel ML, Müller S, Reinhardt TP, Röder M, Rusev G, Schilling KD, Schmidt K, Schramm G, Tonchev AP, Tornow W, Wagner A. Nuclear deformation and neutron excess as competing effects for pygmy dipole strength. 2013 Nov 8;

Publication Date

November 8, 2013

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences