Valence-shell dependence of the pygmy dipole resonance: E1 strength difference in 50,54Cr

Ries, P. C.; Pai, H.; Beck, T.; Beller, J.; Bhike, M.; Derya, V.; Gayer, U.; Isaak, J.; Löher, B.; Krishichayan, None; Mertes, L.; Pietralla, N.; Romig, C.; Savran, D.; Schilling, M.; Tornow, W.; Typel, S.; Werner, V.; Wilhelmy, J.; Zilges, A.; Zweidinger, M.

doi:10.1103/physrevc.100.021301

Title: Valence-shell dependence of the pygmy dipole resonance: E1 strength difference in ^50,54Cr

Journal Article · Mon Aug 05 00:00:00 EDT 2019 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.100.021301· OSTI ID:1610378

Ries, P. C. ^[1]; Pai, H. ^[2]; Beck, T. ^[1]; Beller, J. ^[1]; Bhike, M. ^[3]; Derya, V. ^[4]; Gayer, U. ^[1]; Isaak, J. ^[5]; Löher, B. ^[1]; Krishichayan, None ^[3]; Mertes, L. ^[1]; Pietralla, N. ^[1]; Romig, C. ^[1]; Savran, D. ^[6]; Schilling, M. ^[1]; Tornow, W. ^[3]; Typel, S. ^[5]; Werner, V. ^[1]; Wilhelmy, J. ^[4]; Zilges, A. ^[4] more »

Technische Univ. Darmstadt (Germany)
Technische Univ. Darmstadt (Germany); Saha Inst. of Nuclear Physics, Kolkata (Germany)
Duke Univ., Durham, NC (United States)
Univ. of Cologne, Koln (Germany)
Technische Univ. Darmstadt (Germany); GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt (Germany)
GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt (Germany)

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. The aim was to complement the systematic of the pygmy dipole resonance and first study its behavior across the N = 28 neutron shell closure. Here, photon-scattering cross sections of states of ^50,54Cr were measured up to an excitation energy of 9.7 MeV via the nuclear resonance fluorescence method using γ-ray beams from bremsstrahlung and Compton backscattering. 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 ^50,52,54Cr shows a significant increase above the shell closure. The evolution of the pygmy dipole resonance is heavily influenced by the shell structure.

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Research Organization:: Duke Univ., Durham, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-97ER41033

OSTI ID:: 1610378

Alternate ID(s):: OSTI ID: 1547987

Journal Information:: Physical Review C, Vol. 100, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Title: Valence-shell dependence of the pygmy dipole resonance: E1 strength difference in 50,54Cr

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Title: Valence-shell dependence of the pygmy dipole resonance: E1 strength difference in ^50,54Cr