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

Research output: Contribution to journalArticle

Abstract

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
Volume906
DOIs
Publication statusPublished - 15 May 2013
Externally publishedYes

Keywords

  • 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)

Cite this

Derya, V., Endres, J., Elvers, M., Harakeh, M. N., Pietralla, N., Romig, C., ... Zilges, A. (2013). Study of the pygmy dipole resonance in 94Mo using the (α,α′γ) coincidence technique. Nuclear Physics A, 906, 94-107. https://doi.org/10.1016/j.nuclphysa.2013.02.018
Derya, V. ; Endres, J. ; Elvers, M. ; Harakeh, M. N. ; Pietralla, N. ; Romig, C. ; Savran, D. ; Scheck, M. ; Siebenhuehner, F. ; Stoica, V. I. ; Wortche, H. J. ; Zilges, A. / Study of the pygmy dipole resonance in 94Mo using the (α,α′γ) coincidence technique. In: Nuclear Physics A. 2013 ; Vol. 906. pp. 94-107.
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keywords = "Nuclear reactionsMo94(α,α′γ), Eα=136MeV, measured Eα, using Big-Bite Spectrometer, Eγ, using HPGe, αγ-coin, deduced, levels, J, π, decay branching for discrete levels, pygmy dipole resonance, dipole, quadrupole excitations, B(E1), B(E2)",
author = "V. Derya and J. Endres and M. Elvers and Harakeh, {M. N.} and N. Pietralla and C. Romig and D. Savran and M. Scheck and F. Siebenhuehner and Stoica, {V. I.} and Wortche, {H. J.} and A. Zilges",
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Derya, V, Endres, J, Elvers, M, Harakeh, MN, Pietralla, N, Romig, C, Savran, D, Scheck, M, Siebenhuehner, F, Stoica, VI, Wortche, HJ & Zilges, A 2013, 'Study of the pygmy dipole resonance in 94Mo using the (α,α′γ) coincidence technique' Nuclear Physics A, vol. 906, pp. 94-107. https://doi.org/10.1016/j.nuclphysa.2013.02.018

Study of the pygmy dipole resonance in 94Mo using the (α,α′γ) coincidence technique. / Derya, V.; Endres, J.; Elvers, M.; Harakeh, M. N.; Pietralla, N.; Romig, C.; Savran, D.; Scheck, M.; Siebenhuehner, F.; Stoica, V. I.; Wortche, H. J.; Zilges, A.

In: Nuclear Physics A, Vol. 906, 15.05.2013, p. 94-107.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Study of the pygmy dipole resonance in 94Mo using the (α,α′γ) coincidence technique

AU - Derya, V.

AU - Endres, J.

AU - Elvers, M.

AU - Harakeh, M. N.

AU - Pietralla, N.

AU - Romig, C.

AU - Savran, D.

AU - Scheck, M.

AU - Siebenhuehner, F.

AU - Stoica, V. I.

AU - Wortche, H. J.

AU - Zilges, A.

PY - 2013/5/15

Y1 - 2013/5/15

N2 - 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.

AB - 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.

KW - Nuclear reactionsMo94(α,α′γ)

KW - Eα=136MeV

KW - measured Eα

KW - using Big-Bite Spectrometer

KW - Eγ

KW - using HPGe

KW - αγ-coin

KW - deduced, levels

KW - J

KW - π

KW - decay branching for discrete levels

KW - pygmy dipole resonance

KW - dipole, quadrupole excitations

KW - B(E1)

KW - B(E2)

U2 - 10.1016/j.nuclphysa.2013.02.018

DO - 10.1016/j.nuclphysa.2013.02.018

M3 - Article

VL - 906

SP - 94

EP - 107

JO - Nuclear Physics A

JF - Nuclear Physics A

SN - 0375-9474

ER -