Low-lying octupole isovector excitation in Nd-144

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; J.F.  Smith; T. Soldner; M. Tezgel; W. Urban; J. Vanhoy; M. Werner; V. Werner; K.O. Zell; T. Zerrouki

doi:10.1103/PhysRevC.99.011304

Low-lying octupole isovector excitation in Nd-144

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. SimpsonJ.F. Smith, T. Soldner, M. Tezgel, W. Urban, J. Vanhoy, M. Werner, V. Werner, K.O. Zell, T. Zerrouki

School of Computing, Engineering and Physical Sciences

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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 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 language	English
Article number	011304(R)
Number of pages	6
Journal	Physical Review C
Volume	99
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.99.011304
Publication status	Published - 22 Jan 2019

Keywords

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

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10.1103/PhysRevC.99.011304

2018 12 20 Thuerauf LowAccepted author manuscript, 275 KBLicence: Unspecified

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Thuerauf, M., Stoyanov, C., 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., ... Zerrouki, T. (2019). Low-lying octupole isovector excitation in Nd-144. Physical Review C, 99(1), Article 011304(R). https://doi.org/10.1103/PhysRevC.99.011304

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title = "Low-lying octupole isovector excitation in Nd-144",

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.",

keywords = "collective levels, electromagnetic transitions, lifetimes and widths, nuclear structure and decays, radiative capture",

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

year = "2019",

month = jan,

day = "22",

doi = "10.1103/PhysRevC.99.011304",

language = "English",

volume = "99",

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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 Nd-144', Physical Review C, vol. 99, no. 1, 011304(R). https://doi.org/10.1103/PhysRevC.99.011304

TY - JOUR

T1 - Low-lying octupole isovector excitation in Nd-144

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

SN - 2469-9985

VL - 99

JO - Physical Review C

JF - Physical Review C

IS - 1

M1 - 011304(R)

ER -

Low-lying octupole isovector excitation in Nd-144

Abstract

Keywords

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