Valence-shell dependence of the pygmy dipole resonance: E1 strength difference in Cr-50,Cr-54. Ries, P. C., Pai, H., Beck, T., Beller, J., Bhike, M., Derya, V, Gayer, U., Isaak, J., Loeher, B., Krishichayan, Mertes, L., Pietralla, N., Romig, C., Savran, D., Schilling, M., Tornow, W., Typel, S., Werner, V, Wilhelmy, J., Zilges, A., & Zweidinger, M. Phys. Rev. C, AUG 5, 2019.
doi  abstract   bibtex   
Background: The low-lying electric dipole strength provides insights into the parameters of the nuclear equation of state via its connection with the pygmy dipole resonance and nuclear neutron skin thickness. Purpose: The aim was to complement the systematic of the pygmy dipole resonance and first study its behavior across the N = 28 neutron shell closure. Methods: Photon-scattering cross sections of states of Cr-50,Cr-54 were measured up to an excitation energy of 9.7 MeV via the nuclear resonance fluorescence method using gamma-ray beams from bremsstrahlung and Compton backscattering. Results: Transitions strengths, spin and parity quantum number, and average branching ratios for 55 excited states, 44 of which were observed for the first time, were determined. The comparison between the total observed strengths of the isotopes Cr-50,Cr-52,Cr-54 shows a significant increase above the shell closure. Conclusions: The evolution of the pygmy dipole resonance is heavily influenced by the shell structure.
@article{ISI:000478994900001,
  abstract = {Background: The low-lying electric dipole strength provides insights
   into the parameters of the nuclear equation of state via its connection
   with the pygmy dipole resonance and nuclear neutron skin thickness.
   Purpose: The aim was to complement the systematic of the pygmy dipole
   resonance and first study its behavior across the N = 28 neutron shell
   closure.
   Methods: Photon-scattering cross sections of states of Cr-50,Cr-54 were
   measured up to an excitation energy of 9.7 MeV via the nuclear resonance
   fluorescence method using gamma-ray beams from bremsstrahlung and
   Compton backscattering.
   Results: Transitions strengths, spin and parity quantum number, and
   average branching ratios for 55 excited states, 44 of which were
   observed for the first time, were determined. The comparison between the
   total observed strengths of the isotopes Cr-50,Cr-52,Cr-54 shows a
   significant increase above the shell closure.
   Conclusions: The evolution of the pygmy dipole resonance is heavily
   influenced by the shell structure.},
  added-at = {2019-11-20T10:09:48.000+0100},
  article-number = {021301},
  author = {Ries, P. C. and Pai, H. and Beck, T. and Beller, J. and Bhike, M. and Derya, V and Gayer, U. and Isaak, J. and Loeher, B. and Krishichayan and Mertes, L. and Pietralla, N. and Romig, C. and Savran, D. and Schilling, M. and Tornow, W. and Typel, S. and Werner, V and Wilhelmy, J. and Zilges, A. and Zweidinger, M.},
  biburl = {https://www.bibsonomy.org/bibtex/2d94ceb929a0c7d0702dc5e1ca30f2db7/ikpcologne},
  doi = {10.1103/PhysRevC.100.021301},
  eissn = {2469-9993},
  interhash = {5b1d3b6746620ff4244d78e3dab22097},
  intrahash = {d94ceb929a0c7d0702dc5e1ca30f2db7},
  issn = {2469-9985},
  journal = {Phys. Rev. C},
  keywords = {imported myown zilges},
  month = {AUG 5},
  number = 2,
  orcid-numbers = {Werner, Volker/0000-0003-4001-0150
   Friman-Gayer, Udo/0000-0003-2590-5052},
  researcherid-numbers = {Werner, Volker/C-1181-2017},
  timestamp = {2019-11-20T10:09:48.000+0100},
  title = {Valence-shell dependence of the pygmy dipole resonance: E1 strength
   difference in Cr-50,Cr-54},
  unique-id = {ISI:000478994900001},
  volume = 100,
  year = 2019
}

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