Low-lying octupole isovector excitation in Nd144

Thürauf, M.; Stoyanov, Ch.; Scheck, Marcus; Jentschel, M.; Bernards, C.; Blanc, A.; Cooper, N.; De France, G.; Gregor, E. T.; Henrich, C.; Hicks, S. F.; Jolie, J.; Kaleja, O.; Köster, U.; Kröll, 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.

doi:10.1103/physrevc.99.011304

Title: Low-lying octupole isovector excitation in ${}^{144}{Nd}$

Journal Article · 22 January 2019 · Physical Review C

DOI: https://doi.org/10.1103/physrevc.99.011304 · OSTI ID:1610162

Thürauf, M. ^[1]; Stoyanov, Ch. ^[2]; Scheck, Marcus ^[3]; Jentschel, M. ^[4]; Bernards, C. ^[5]; Blanc, A. ^[4]; Cooper, N. ^[5]; De France, G. ^[6]; Gregor, E. T. ^[7]; Henrich, C. ^[8]; Hicks, S. F. ^[9]; Jolie, J. ^[10]; Kaleja, O. ^[8]; Köster, U. ^[4]; Kröll, T. ^[8]; Leguillon, R. ^[11]; Mutti, P. ^[4]; O'Donnell, D. ^[7]; Petrache, C. M. ^[11]; Simpson, G. S. ^[12] more »

TU Darmstadt (Germany); DOE/OSTI
Bulgarian Academy of Sciences, Sofia (Bulgaria)
TU Darmstadt (Germany); Univ. of the West of Scotland, Paisley (United Kingdom); The Scottish Univ. Physics Alliance, Glasgow (United Kingdom)
Inst. Laue-Langevin, Grenoble (France)
Yale Univ., New Haven, CT (United States)
Grand Accélérateur National d'Ions Lourds, Caen (France)
Univ. of the West of Scotland, Paisley (United Kingdom); The Scottish Univ. Physics Alliance, Glasgow (United Kingdom)
TU Darmstadt (Germany)
Univ. of Dallas, Irving, TX (United States)
Univ. zu Koln (Germany)
Univ. Paris-Saclay, Orsay Cedex (France)
LPSC, Grenoble Cedex (France)
Univ. of Warsaw (Poland)
U.S. Naval Academy, Annapolis, MD (United Kingdom)
TU Darmstadt (Germany); Yale Univ., New Haven, CT (United States)

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 2779 keV as low-lying isovector octupole excitation. Here, the 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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Research Organization:: Yale Univ., New Haven, CT (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-91ER40609

OSTI ID:: 1610162

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 1 Vol. 99; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Low-lying octupole isovector excitation in ${}^{144}{Nd}$