Low-lying octupole isovector excitation in 144Nd

M. Thuerauf, Ch. Stoyanov, M. Scheck, M. Jentschel, C. Bernards, A. Blanc, N. Cooper, G. De France, E.T. Gregor, C. Henrich, S.F. Hicks, J. Jolie, O. Kaleja, U. Koester, T. Kroell, R. Leguillon, P. Mutti, D. O'Donnell, C.M. Petrache, G.S. Simpson & 9 others J.F. Smith, T. Soldner, M. Tezgel, W. Urban, J. Vanhoy, M. Werner, V. Werner, K.O. Zell, T. Zerrouki

Research output: Contribution to journalArticle

Abstract

The nature of low-lying 3− levels in 144Nd was investigated in the 143Nd(n,γγ) cold neutron-capture reaction. The combination of the high neutron flux from the research reactor at the Institut Laue-Langevin and the high γ-ray detection efficiency of the EXILL setup allowed the recording of γγ
coincidences. From the coincidence data precise branching ratios were extracted. Furthermore, the octagonal symmetry of the setup allowed angular-distribution measurements to determine multipole-mixing ratios. Additionally, in a second measurement the ultra-high resolution spectrometer GAMS6 was employed to conduct lifetime measurements using the gamma-ray induced Doppler-shift technique (GRID). The confirmed strong M1 component in the 3−3→3−1 decay strongly supports the assignment of the 3−3 level at
2779keV as low-lying isovector octupole excitation. Microscopic calculations within the quasiparticle phonon model confirm an isovector component in the wave function of the 3−3 level, firmly establishing this fundamental mode of nuclear excitation in near-spherical nuclei.
Original languageEnglish
Article number011304(R)
Number of pages6
JournalPhysical Review C
Volume99
Issue number1
DOIs
Publication statusPublished - 22 Jan 2019

Fingerprint

excitation
cold neutrons
mixing ratios
flux (rate)
multipoles
rays
angular distribution
recording
reactors
wave functions
gamma rays
spectrometers
life (durability)
nuclei
shift
high resolution
symmetry
decay

Keywords

  • collective levels
  • electromagnetic transitions
  • lifetimes and widths
  • nuclear structure and decays
  • radiative capture

Cite this

Thuerauf, M., Stoyanov, C., Scheck, M., Jentschel, M., Bernards, C., Blanc, A., ... Zerrouki, T. (2019). Low-lying octupole isovector excitation in 144Nd. Physical Review C, 99(1), [011304(R)]. https://doi.org/10.1103/PhysRevC.99.011304
Thuerauf, M. ; Stoyanov, Ch. ; Scheck, M. ; Jentschel, M. ; Bernards, C. ; Blanc, A. ; Cooper, N. ; De France, G. ; Gregor, E.T. ; Henrich, C. ; Hicks, S.F. ; Jolie, J. ; Kaleja, O. ; Koester, U. ; Kroell, T. ; Leguillon, R. ; Mutti, P. ; O'Donnell, D. ; Petrache, C.M. ; Simpson, G.S. ; Smith, J.F. ; Soldner, T. ; Tezgel, M. ; Urban, W. ; Vanhoy, J. ; Werner, M. ; Werner, V. ; Zell, K.O. ; Zerrouki, T. / Low-lying octupole isovector excitation in 144Nd. In: Physical Review C. 2019 ; Vol. 99, No. 1.
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abstract = "The nature of low-lying 3− levels in 144Nd was investigated in the 143Nd(n,γγ) cold neutron-capture reaction. The combination of the high neutron flux from the research reactor at the Institut Laue-Langevin and the high γ-ray detection efficiency of the EXILL setup allowed the recording of γγcoincidences. From the coincidence data precise branching ratios were extracted. Furthermore, the octagonal symmetry of the setup allowed angular-distribution measurements to determine multipole-mixing ratios. Additionally, in a second measurement the ultra-high resolution spectrometer GAMS6 was employed to conduct lifetime measurements using the gamma-ray induced Doppler-shift technique (GRID). The confirmed strong M1 component in the 3−3→3−1 decay strongly supports the assignment of the 3−3 level at 2779keV as low-lying isovector octupole excitation. Microscopic calculations within the quasiparticle phonon model confirm an isovector component in the wave function of the 3−3 level, firmly establishing this fundamental mode of nuclear excitation in near-spherical nuclei.",
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Thuerauf, M, Stoyanov, C, Scheck, M, Jentschel, M, Bernards, C, Blanc, A, Cooper, N, De France, G, Gregor, ET, Henrich, C, Hicks, SF, Jolie, J, Kaleja, O, Koester, U, Kroell, T, Leguillon, R, Mutti, P, O'Donnell, D, Petrache, CM, Simpson, GS, Smith, JF, Soldner, T, Tezgel, M, Urban, W, Vanhoy, J, Werner, M, Werner, V, Zell, KO & Zerrouki, T 2019, 'Low-lying octupole isovector excitation in 144Nd' Physical Review C, vol. 99, no. 1, 011304(R). https://doi.org/10.1103/PhysRevC.99.011304

Low-lying octupole isovector excitation in 144Nd. / Thuerauf, M.; Stoyanov, Ch.; Scheck, M.; Jentschel, M.; Bernards, C.; Blanc, A.; Cooper, N.; De France, G.; Gregor, E.T.; Henrich, C.; Hicks, S.F.; Jolie, J.; Kaleja, O.; Koester, U.; Kroell, T.; Leguillon, R.; Mutti, P.; O'Donnell, D.; Petrache, C.M.; Simpson, G.S.; Smith, J.F. ; Soldner, T.; Tezgel, M.; Urban, W.; Vanhoy, J.; Werner, M.; Werner, V.; Zell, K.O.; Zerrouki, T.

In: Physical Review C, Vol. 99, No. 1, 011304(R), 22.01.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Low-lying octupole isovector excitation in 144Nd

AU - Thuerauf, M.

AU - Stoyanov, Ch.

AU - Scheck, M.

AU - Jentschel, M.

AU - Bernards, C.

AU - Blanc, A.

AU - Cooper, N.

AU - De France, G.

AU - Gregor, E.T.

AU - Henrich, C.

AU - Hicks, S.F.

AU - Jolie, J.

AU - Kaleja, O.

AU - Koester, U.

AU - Kroell, T.

AU - Leguillon, R.

AU - Mutti, P.

AU - O'Donnell, D.

AU - Petrache, C.M.

AU - Simpson, G.S.

AU - Smith, J.F.

AU - Soldner, T.

AU - Tezgel, M.

AU - Urban, W.

AU - Vanhoy, J.

AU - Werner, M.

AU - Werner, V.

AU - Zell, K.O.

AU - Zerrouki, T.

PY - 2019/1/22

Y1 - 2019/1/22

N2 - The nature of low-lying 3− levels in 144Nd was investigated in the 143Nd(n,γγ) cold neutron-capture reaction. The combination of the high neutron flux from the research reactor at the Institut Laue-Langevin and the high γ-ray detection efficiency of the EXILL setup allowed the recording of γγcoincidences. From the coincidence data precise branching ratios were extracted. Furthermore, the octagonal symmetry of the setup allowed angular-distribution measurements to determine multipole-mixing ratios. Additionally, in a second measurement the ultra-high resolution spectrometer GAMS6 was employed to conduct lifetime measurements using the gamma-ray induced Doppler-shift technique (GRID). The confirmed strong M1 component in the 3−3→3−1 decay strongly supports the assignment of the 3−3 level at 2779keV as low-lying isovector octupole excitation. Microscopic calculations within the quasiparticle phonon model confirm an isovector component in the wave function of the 3−3 level, firmly establishing this fundamental mode of nuclear excitation in near-spherical nuclei.

AB - The nature of low-lying 3− levels in 144Nd was investigated in the 143Nd(n,γγ) cold neutron-capture reaction. The combination of the high neutron flux from the research reactor at the Institut Laue-Langevin and the high γ-ray detection efficiency of the EXILL setup allowed the recording of γγcoincidences. From the coincidence data precise branching ratios were extracted. Furthermore, the octagonal symmetry of the setup allowed angular-distribution measurements to determine multipole-mixing ratios. Additionally, in a second measurement the ultra-high resolution spectrometer GAMS6 was employed to conduct lifetime measurements using the gamma-ray induced Doppler-shift technique (GRID). The confirmed strong M1 component in the 3−3→3−1 decay strongly supports the assignment of the 3−3 level at 2779keV as low-lying isovector octupole excitation. Microscopic calculations within the quasiparticle phonon model confirm an isovector component in the wave function of the 3−3 level, firmly establishing this fundamental mode of nuclear excitation in near-spherical nuclei.

KW - collective levels

KW - electromagnetic transitions

KW - lifetimes and widths

KW - nuclear structure and decays

KW - radiative capture

U2 - 10.1103/PhysRevC.99.011304

DO - 10.1103/PhysRevC.99.011304

M3 - Article

VL - 99

JO - Physical Review C

JF - Physical Review C

SN - 2469-9985

IS - 1

M1 - 011304(R)

ER -

Thuerauf M, Stoyanov C, Scheck M, Jentschel M, Bernards C, Blanc A et al. Low-lying octupole isovector excitation in 144Nd. Physical Review C. 2019 Jan 22;99(1). 011304(R). https://doi.org/10.1103/PhysRevC.99.011304