Emergence of quadrupole and octupole collectivity near N = 50 and Z = 40 : Coulomb excitation of Mo 92

J. Heery; J. Henderson; E. Yüksel; J. A. Purcell; B. A. Brown; A. D. Ayangeakaa; L. Canete; S. Carmichael; M. Carpenter; W. N. Catford; P. Copp; C. Cousins; M. Devlin; D. T. Doherty; L. P. Gaffney; P. E. Garrett; K. Hadyńska-Klęk; H. Jayatissa; S. Kisyov; F. Kondev; D. Lascar; T. Lauritsen; G. Lotay; C. Müller-Gatermann; S. Nandi; C. O'Shea; C. Paxman; S. Pascu; Z. Podolyak; B. J. Reed; P. H. Regan; W. Reviol; E. Rubino; R. Russell; D. Seweryniak; M. Siciliano; G. L. Wilson; K. Wrzosek-Lipska; C. Y. Wu

doi:10.1103/n2jr-6c42

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Emergence of quadrupole and octupole collectivity near N = 50 and Z = 40 : Coulomb excitation of Mo 92

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Emergence of quadrupole and octupole collectivity near N = 50 and Z = 40 : Coulomb excitation of Mo 92

J. Heery, J. Henderson, E. Yüksel, J. A. Purcell, B. A. Brown, A. D. Ayangeakaa, L. Canete, S. Carmichael, M. Carpenter, W. N. Catford, …

Physical review. C, Vol.114(2), 024338

08/2026

DOI: https://doi.org/10.1103/n2jr-6c42

Abstract

The collective structure of low-lying states in the N = 50 nucleus 92Mo (Z = 42) has been investigated through sub-barrier Coulomb excitation using the CHICO2 device coupled to the gamma-ray energy tracking in-beam nuclear array (GRETINA). Quadrupole and octupole collective properties are measured for the 2+1, 2+2 , 2+3 , 2+4 , and 3-1 states. The spectroscopic quadrupole moment for the 2+1 state is measured to be Qs = 0.23(8) eb, showing a weakly deformed oblate nature in good agreement with recent state-of-the-art Shell-Model calculations. A modest reduced electric-octupole transition strength of B(E 3; 3-1-* 0+1 ) = 15(3) W.u. is obtained, in disagreement with the literature, revealing an emerging tension in the strength of octupole collectivity for the N = 50 nuclei between historic (e, e') and (p, p') experiments and more recent experiments utilizing Coulomb excitation and lifetime plus branching-ratio data.

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Title: Emergence of quadrupole and octupole collectivity near N = 50 and Z = 40 : Coulomb excitation of Mo 92
Creators: J. Heery - National Physical Laboratory
J. Henderson - University of Surrey
E. Yüksel - University of Surrey
J. A. Purcell - Michigan State University
B. A. Brown - Michigan State University
A. D. Ayangeakaa - University of North Carolina at Chapel Hill
L. Canete - University of Surrey
S. Carmichael - University of Notre Dame
M. Carpenter - Argonne National Laboratory
W. N. Catford - University of Surrey
P. Copp - Argonne National Laboratory
C. Cousins
M. Devlin - Los Alamos National Laboratory
D. T. Doherty - University of Surrey
L. P. Gaffney - University of Liverpool
P. E. Garrett - University of Guelph
K. Hadyńska-Klęk - University of Warsaw
H. Jayatissa - Argonne National Laboratory
S. Kisyov - Lawrence Livermore National Laboratory
F. Kondev - Argonne National Laboratory
D. Lascar
T. Lauritsen - Argonne National Laboratory
G. Lotay - University of Surrey
C. Müller-Gatermann - Argonne National Laboratory
S. Nandi - Argonne National Laboratory
C. O'Shea
C. Paxman - University of Surrey
S. Pascu - University of Surrey
Z. Podolyak - University of Surrey
B. J. Reed - University of Surrey
P. H. Regan - National Physical Laboratory
W. Reviol - Argonne National Laboratory
E. Rubino - Michigan State University
R. Russell - University of Surrey
D. Seweryniak - Argonne National Laboratory
M. Siciliano - Argonne National Laboratory
G. L. Wilson - Louisiana State University
K. Wrzosek-Lipska - University of Warsaw
C. Y. Wu - Lawrence Livermore National Laboratory
Publication Details: Physical review. C, Vol.114(2), 024338
Publisher: AMER PHYSICAL SOC; COLLEGE PK
Number of pages: 10
Publication Date: 08/2026
Grant note: National Science Centre, Poland: 2023/50/E/ST2/00621
The authors thank the ATLAS operational staff of Argonne National Laboratory for providing the beam. Work at the University of Surrey was supported under UKRI Future Leaders Fellowship (Grant No. MR/T022264/1) and the Science and Technologies Facilities Council (STFC) (Grant No. ST/V001108/1). P.H.R. was partially supported by the National Measurements System Programmes Unit of the UK's Department for Science, Innovation and Technology (DSIT). Work was supported by the NSF under Grants No. PHY-2110365, No. PHY-2208137, No. PHY-2011890 and No. PHY-1913028. Work of Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. Work at Lawrence Livermore National Laboratory was performed under the auspices of the U.S. Department of Energy under Contract No. DE-AC52-07NA27344. Work at UNC is sponsored by the U.S. Department of Energy under Grants No. DE-FG02-97ER41041 (UNC) and No. DE-FG02-97ER41033 (TUNL). Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy (Contract No. 89233218CNA000001). Work was supported under U.S. Department of Energy under Contract No. DE-SC0021243. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DEAC02-05CH11231 (LBNL). GRETINA was funded by the U.S. DOE, Office of Science, Office of Nuclear Physics, and operated by the ANL and LBNL contract numbers above. This research uses resources of ANL's ATLAS facility, which is a U.S. Department of Energy Office of Science User facility. Work was supported by the National Science Centre, Poland under Grant No. 2023/50/E/ST2/00621.
Identifiers: 991160195502346; WOS:001865565100002
Academic Unit: School of Maths and Physics
Language: English
Resource Type: Journal article

Emergence of quadrupole and octupole collectivity near N = 50 and Z = 40 : Coulomb excitation of Mo 92

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