Low-lying dipole strength of the open-shell nucleus Mo-94

C. Romig, J. Beller, J. Glorius, J. Isaak, J.H. Kelley, E. Kwan, N. Pietralla, V. Yu Ponomarev, A. Sauerwein, D. Savran, M. Scheck, L. Schnorrenberger, K. Sonnabend, A.P. Tonchev, W. Tornow, H.R. Weller, A. Zilges, M. Zweidinger

Research output: Contribution to journalArticle

Abstract

The low-lying dipole strength of the open-shell nucleus 94Mo was studied via the nuclear resonance fluorescence technique up to 8.7 MeV excitation energy at the bremsstrahlung facility at the Superconducting Darmstadt Electron Linear Accelerator (S-DALINAC), and with Compton backscattered photons at the High Intensity γ-ray Source (HIγS) facility. In total, 83 excited states were identified. Exploiting polarized quasi-monoenergetic photons at HIγS, parity quantum numbers were assigned to 41 states excited by dipole transitions. The electric dipole-strength distribution was determined up to 8.7 MeV and compared to microscopic calculations within the quasiparticle phonon model. Calculations and experimental data are in good agreement for the fragmentation, as well as for the integrated strength. The average decay pattern of the excited states was investigated exploiting the HIγS measurements at five energy settings. Mean branching ratios to the ground state and first excited
2+1 state were extracted from the measurements with quasi-monoenergetic photons and compared to γ-cascade simulations within the statistical model. The experimentally deduced mean branching ratios exhibit a resonance-like maximum at 6.4 MeV which cannot be reproduced within the statistical model. This indicates a nonstatistical structure in the energy range between 5.5 and 7.5 MeV.
Original languageEnglish
Article number044331
JournalPhysical Review C
Volume88
Issue number4
DOIs
Publication statusPublished - 29 Oct 2013

Cite this

Romig, C., Beller, J., Glorius, J., Isaak, J., Kelley, J. H., Kwan, E., ... Zweidinger, M. (2013). Low-lying dipole strength of the open-shell nucleus Mo-94. Physical Review C, 88(4), [044331]. https://doi.org/10.1103/PhysRevC.88.044331
Romig, C. ; Beller, J. ; Glorius, J. ; Isaak, J. ; Kelley, J.H. ; Kwan, E. ; Pietralla, N. ; Ponomarev, V. Yu ; Sauerwein, A. ; Savran, D. ; Scheck, M. ; Schnorrenberger, L. ; Sonnabend, K. ; Tonchev, A.P. ; Tornow, W. ; Weller, H.R. ; Zilges, A. ; Zweidinger, M. / Low-lying dipole strength of the open-shell nucleus Mo-94. In: Physical Review C. 2013 ; Vol. 88, No. 4.
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abstract = "The low-lying dipole strength of the open-shell nucleus 94Mo was studied via the nuclear resonance fluorescence technique up to 8.7 MeV excitation energy at the bremsstrahlung facility at the Superconducting Darmstadt Electron Linear Accelerator (S-DALINAC), and with Compton backscattered photons at the High Intensity γ-ray Source (HIγS) facility. In total, 83 excited states were identified. Exploiting polarized quasi-monoenergetic photons at HIγS, parity quantum numbers were assigned to 41 states excited by dipole transitions. The electric dipole-strength distribution was determined up to 8.7 MeV and compared to microscopic calculations within the quasiparticle phonon model. Calculations and experimental data are in good agreement for the fragmentation, as well as for the integrated strength. The average decay pattern of the excited states was investigated exploiting the HIγS measurements at five energy settings. Mean branching ratios to the ground state and first excited 2+1 state were extracted from the measurements with quasi-monoenergetic photons and compared to γ-cascade simulations within the statistical model. The experimentally deduced mean branching ratios exhibit a resonance-like maximum at 6.4 MeV which cannot be reproduced within the statistical model. This indicates a nonstatistical structure in the energy range between 5.5 and 7.5 MeV.",
author = "C. Romig and J. Beller and J. Glorius and J. Isaak and J.H. Kelley and E. Kwan and N. Pietralla and Ponomarev, {V. Yu} and A. Sauerwein and D. Savran and M. Scheck and L. Schnorrenberger and K. Sonnabend and A.P. Tonchev and W. Tornow and H.R. Weller and A. Zilges and M. Zweidinger",
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Romig, C, Beller, J, Glorius, J, Isaak, J, Kelley, JH, Kwan, E, Pietralla, N, Ponomarev, VY, Sauerwein, A, Savran, D, Scheck, M, Schnorrenberger, L, Sonnabend, K, Tonchev, AP, Tornow, W, Weller, HR, Zilges, A & Zweidinger, M 2013, 'Low-lying dipole strength of the open-shell nucleus Mo-94' Physical Review C, vol. 88, no. 4, 044331. https://doi.org/10.1103/PhysRevC.88.044331

Low-lying dipole strength of the open-shell nucleus Mo-94. / Romig, C.; Beller, J.; Glorius, J.; Isaak, J.; Kelley, J.H.; Kwan, E.; Pietralla, N.; Ponomarev, V. Yu; Sauerwein, A.; Savran, D.; Scheck, M.; Schnorrenberger, L.; Sonnabend, K.; Tonchev, A.P.; Tornow, W.; Weller, H.R.; Zilges, A.; Zweidinger, M.

In: Physical Review C, Vol. 88, No. 4, 044331, 29.10.2013.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Low-lying dipole strength of the open-shell nucleus Mo-94

AU - Romig, C.

AU - Beller, J.

AU - Glorius, J.

AU - Isaak, J.

AU - Kelley, J.H.

AU - Kwan, E.

AU - Pietralla, N.

AU - Ponomarev, V. Yu

AU - Sauerwein, A.

AU - Savran, D.

AU - Scheck, M.

AU - Schnorrenberger, L.

AU - Sonnabend, K.

AU - Tonchev, A.P.

AU - Tornow, W.

AU - Weller, H.R.

AU - Zilges, A.

AU - Zweidinger, M.

PY - 2013/10/29

Y1 - 2013/10/29

N2 - The low-lying dipole strength of the open-shell nucleus 94Mo was studied via the nuclear resonance fluorescence technique up to 8.7 MeV excitation energy at the bremsstrahlung facility at the Superconducting Darmstadt Electron Linear Accelerator (S-DALINAC), and with Compton backscattered photons at the High Intensity γ-ray Source (HIγS) facility. In total, 83 excited states were identified. Exploiting polarized quasi-monoenergetic photons at HIγS, parity quantum numbers were assigned to 41 states excited by dipole transitions. The electric dipole-strength distribution was determined up to 8.7 MeV and compared to microscopic calculations within the quasiparticle phonon model. Calculations and experimental data are in good agreement for the fragmentation, as well as for the integrated strength. The average decay pattern of the excited states was investigated exploiting the HIγS measurements at five energy settings. Mean branching ratios to the ground state and first excited 2+1 state were extracted from the measurements with quasi-monoenergetic photons and compared to γ-cascade simulations within the statistical model. The experimentally deduced mean branching ratios exhibit a resonance-like maximum at 6.4 MeV which cannot be reproduced within the statistical model. This indicates a nonstatistical structure in the energy range between 5.5 and 7.5 MeV.

AB - The low-lying dipole strength of the open-shell nucleus 94Mo was studied via the nuclear resonance fluorescence technique up to 8.7 MeV excitation energy at the bremsstrahlung facility at the Superconducting Darmstadt Electron Linear Accelerator (S-DALINAC), and with Compton backscattered photons at the High Intensity γ-ray Source (HIγS) facility. In total, 83 excited states were identified. Exploiting polarized quasi-monoenergetic photons at HIγS, parity quantum numbers were assigned to 41 states excited by dipole transitions. The electric dipole-strength distribution was determined up to 8.7 MeV and compared to microscopic calculations within the quasiparticle phonon model. Calculations and experimental data are in good agreement for the fragmentation, as well as for the integrated strength. The average decay pattern of the excited states was investigated exploiting the HIγS measurements at five energy settings. Mean branching ratios to the ground state and first excited 2+1 state were extracted from the measurements with quasi-monoenergetic photons and compared to γ-cascade simulations within the statistical model. The experimentally deduced mean branching ratios exhibit a resonance-like maximum at 6.4 MeV which cannot be reproduced within the statistical model. This indicates a nonstatistical structure in the energy range between 5.5 and 7.5 MeV.

U2 - 10.1103/PhysRevC.88.044331

DO - 10.1103/PhysRevC.88.044331

M3 - Article

VL - 88

JO - Physical Review C

JF - Physical Review C

SN - 2469-9985

IS - 4

M1 - 044331

ER -

Romig C, Beller J, Glorius J, Isaak J, Kelley JH, Kwan E et al. Low-lying dipole strength of the open-shell nucleus Mo-94. Physical Review C. 2013 Oct 29;88(4). 044331. https://doi.org/10.1103/PhysRevC.88.044331