Decay pattern of the pygmy dipole resonance in 60Ni

Marcus Scheck, V. Yu. Ponomarev, T. Aumann, J. Beller, M. Fritzsche, J. Isaak, J. H. Kelley, E. Kwan, N. Pietralla, R. Raut, C. Romig, G. Rusev, D. Savran, K. Sonnabend, A. P. Tonchev, W. Tornow, H. R. Weller, M. Zweidinger

Research output: Contribution to journalArticle

Abstract

Spin-1 states in 60Ni were excited with the (γ⃗ ,γ′) reaction, exploiting the High Intensity γ⃗ -ray Source at Triangle University Nuclear Laboratory. This facility is capable of providing fully linearly polarized, quasimonochromatic, Compton-backscattered photons in the entrance channel of the reaction. The depopulation of low-lying levels in an energy region far below the incident quasimonochromatic photons allows us to obtain average branching ratios of the excited spin-1 states. Levels within the energy region associated with the PDR showed regular behavior and ≈75% of their decays are direct ground-state decays. The levels in the energy region above the PDR exhibit a statistical decay behavior to a large number of low-lying excited states and have only ≈50–60% branches to the ground state. Within the framework of the quasiparticle phonon model this feature can be explained with the number of quasiparticles contributing to the wave functions of the excited spin-1 states. Quasimonochromatic photon beams provide a new method to test the microscopic nature of 1− levels.
Original languageEnglish
Article number051304(R)
JournalPhysical Review C
Volume87
Issue number5
DOIs
Publication statusPublished - 15 May 2013
Externally publishedYes

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dipoles
decay
ground state
photon beams
photons
triangles
entrances
energy
rays
wave functions
excitation

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Scheck, M., Ponomarev, V. Y., Aumann, T., Beller, J., Fritzsche, M., Isaak, J., ... Zweidinger, M. (2013). Decay pattern of the pygmy dipole resonance in 60Ni. Physical Review C, 87(5), [051304(R)]. https://doi.org/10.1103/PhysRevC.87.051304
Scheck, Marcus ; Ponomarev, V. Yu. ; Aumann, T. ; Beller, J. ; Fritzsche, M. ; Isaak, J. ; Kelley, J. H. ; Kwan, E. ; Pietralla, N. ; Raut, R. ; Romig, C. ; Rusev, G. ; Savran, D. ; Sonnabend, K. ; Tonchev, A. P. ; Tornow, W. ; Weller, H. R. ; Zweidinger, M. / Decay pattern of the pygmy dipole resonance in 60Ni. In: Physical Review C. 2013 ; Vol. 87, No. 5.
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Scheck, M, Ponomarev, VY, Aumann, T, Beller, J, Fritzsche, M, Isaak, J, Kelley, JH, Kwan, E, Pietralla, N, Raut, R, Romig, C, Rusev, G, Savran, D, Sonnabend, K, Tonchev, AP, Tornow, W, Weller, HR & Zweidinger, M 2013, 'Decay pattern of the pygmy dipole resonance in 60Ni' Physical Review C, vol. 87, no. 5, 051304(R). https://doi.org/10.1103/PhysRevC.87.051304

Decay pattern of the pygmy dipole resonance in 60Ni. / Scheck, Marcus; Ponomarev, V. Yu.; Aumann, T.; Beller, J.; Fritzsche, M.; Isaak, J.; Kelley, J. H.; Kwan, E.; Pietralla, N.; Raut, R.; Romig, C.; Rusev, G.; Savran, D.; Sonnabend, K.; Tonchev, A. P.; Tornow, W.; Weller, H. R.; Zweidinger, M.

In: Physical Review C, Vol. 87, No. 5, 051304(R), 15.05.2013.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Decay pattern of the pygmy dipole resonance in 60Ni

AU - Scheck, Marcus

AU - Ponomarev, V. Yu.

AU - Aumann, T.

AU - Beller, J.

AU - Fritzsche, M.

AU - Isaak, J.

AU - Kelley, J. H.

AU - Kwan, E.

AU - Pietralla, N.

AU - Raut, R.

AU - Romig, C.

AU - Rusev, G.

AU - Savran, D.

AU - Sonnabend, K.

AU - Tonchev, A. P.

AU - Tornow, W.

AU - Weller, H. R.

AU - Zweidinger, M.

PY - 2013/5/15

Y1 - 2013/5/15

N2 - Spin-1 states in 60Ni were excited with the (γ⃗ ,γ′) reaction, exploiting the High Intensity γ⃗ -ray Source at Triangle University Nuclear Laboratory. This facility is capable of providing fully linearly polarized, quasimonochromatic, Compton-backscattered photons in the entrance channel of the reaction. The depopulation of low-lying levels in an energy region far below the incident quasimonochromatic photons allows us to obtain average branching ratios of the excited spin-1 states. Levels within the energy region associated with the PDR showed regular behavior and ≈75% of their decays are direct ground-state decays. The levels in the energy region above the PDR exhibit a statistical decay behavior to a large number of low-lying excited states and have only ≈50–60% branches to the ground state. Within the framework of the quasiparticle phonon model this feature can be explained with the number of quasiparticles contributing to the wave functions of the excited spin-1 states. Quasimonochromatic photon beams provide a new method to test the microscopic nature of 1− levels.

AB - Spin-1 states in 60Ni were excited with the (γ⃗ ,γ′) reaction, exploiting the High Intensity γ⃗ -ray Source at Triangle University Nuclear Laboratory. This facility is capable of providing fully linearly polarized, quasimonochromatic, Compton-backscattered photons in the entrance channel of the reaction. The depopulation of low-lying levels in an energy region far below the incident quasimonochromatic photons allows us to obtain average branching ratios of the excited spin-1 states. Levels within the energy region associated with the PDR showed regular behavior and ≈75% of their decays are direct ground-state decays. The levels in the energy region above the PDR exhibit a statistical decay behavior to a large number of low-lying excited states and have only ≈50–60% branches to the ground state. Within the framework of the quasiparticle phonon model this feature can be explained with the number of quasiparticles contributing to the wave functions of the excited spin-1 states. Quasimonochromatic photon beams provide a new method to test the microscopic nature of 1− levels.

U2 - 10.1103/PhysRevC.87.051304

DO - 10.1103/PhysRevC.87.051304

M3 - Article

VL - 87

JO - Physical Review C

JF - Physical Review C

SN - 2469-9985

IS - 5

M1 - 051304(R)

ER -

Scheck M, Ponomarev VY, Aumann T, Beller J, Fritzsche M, Isaak J et al. Decay pattern of the pygmy dipole resonance in 60Ni. Physical Review C. 2013 May 15;87(5). 051304(R). https://doi.org/10.1103/PhysRevC.87.051304