Study of the pygmy dipole resonance in 94Mo using the (α,α′γ) coincidence technique

V. Derya, J. Endres, M. Elvers, M. N. Harakeh, N. Pietralla, C. Romig, D. Savran, M. Scheck, F. Siebenhuehner, V. I. Stoica, H. J. Wortche, A. Zilges

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21 Citations (Scopus)


The (α,α′γ) reaction at Eα=136MeV was used to study the electric dipole response in the open-shell vibrational nucleus 94Mo below the neutron-separation threshold. The coincidence experiment has been performed at the Kernfysisch Versneller Instituut in Groningen, The Netherlands, exploiting the Big-Bite Spectrometer and an array of large volume High-Purity Germanium (HPGe) detectors. Due to the excellent energy resolution and high selectivity to transitions stemming from the pygmy dipole resonance, singles α-scattering cross sections could be determined for individual electric dipole excitations between 4 and 8 MeV. For three of the excited low-lying Jπ=1− states in 94Mo a γ-decay branch into the Jπ=21+ state could be observed.

The experiment extends the systematic studies of the pygmy dipole resonance by real-photon scattering (γ,γ′) experiments and (α,α′γ) experiments. Recently, a (γ,γ′) experiment on 94Mo was performed at the Darmstadt High-Intensity Photon Setup at the S-DALINAC in Darmstadt, Germany, permitting the comparison of B(E1)↑ strength distribution and α-scattering cross sections.
Original languageEnglish
Pages (from-to)94-107
Number of pages14
JournalNuclear Physics A
Publication statusPublished - 15 May 2013
Externally publishedYes


  • Nuclear reactionsMo94(α,α′γ)
  • Eα=136MeV
  • measured Eα
  • using Big-Bite Spectrometer
  • using HPGe
  • αγ-coin
  • deduced, levels
  • J
  • π
  • decay branching for discrete levels
  • pygmy dipole resonance
  • dipole, quadrupole excitations
  • B(E1)
  • B(E2)


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