Collapse of Nuclear Collectivity along the N = Z Line
Abstract
The lifetime of the J π = 2 + state in the self-conjugate Ru 88 nucleus has been determined in an experiment performed using rare-isotope beams provided by the new Facility for Rare Isotope Beams. This is the heaviest N = Z nucleus for which such a measurement has been achieved. Ru 88 was populated by both one-neutron knockout and charge-exchange reactions, and the lifetime of 14.3 − 3.4 + 2.5 ps was determined using the triple-foil plunger technique. The extracted electromagnetic transition strength shows that the quadrupole collectivity has dropped significantly compared with the highly deformed N = Z region around A ∼ 80 . These results are compared with state-of-the-art large-scale shell-model and discrete nonorthogonal shell-model calculations. The theoretical calculations indicate a moderate triaxial deformation and suggest that low-lying states in this nucleus are no longer dominated by strong many-particle many-hole excitations, unlike the lighter, highly deformed N = Z nuclei nearby.
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BibTeX
@article{bentley2026collapse,
title = {{Collapse of Nuclear Collectivity along the N = Z Line}},
author = {M. A. Bentley and R. Taniuchi and R. Wadsworth and H. Iwasaki and D. D. Dao and F. Nowacki and M. J. Basson and T. Beck and B. Cederwall and J. Chen and S. Chen and J. Dobaczewski and M. Doncel and A. Douglas and P. Farris and A. Gade and S. A. Gillespie and A. M. Hill and D. G. Jenkins and J. Chung-Jung and S. M. Lenzi and W. Marshall and S. Paschalis and J. Pereira and X. Pereira-Lopez and M. Petri and R. Salinas and A. Sanchez and J. A. Swartz and C. Tinson and D. Weisshaar and K. Wimmer},
journal = {Physical Review Letters},
year = {2026},
month = oct,
doi = {10.1103/r6ns-ypw8},
url = {https://hal.science/hal-05775598v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Collapse of Nuclear Collectivity along the N = Z Line
AU - M. A. Bentley
AU - R. Taniuchi
AU - R. Wadsworth
AU - H. Iwasaki
AU - D. D. Dao
AU - F. Nowacki
AU - M. J. Basson
AU - T. Beck
AU - B. Cederwall
AU - J. Chen
AU - S. Chen
AU - J. Dobaczewski
AU - M. Doncel
AU - A. Douglas
AU - P. Farris
AU - A. Gade
AU - S. A. Gillespie
AU - A. M. Hill
AU - D. G. Jenkins
AU - J. Chung-Jung
AU - S. M. Lenzi
AU - W. Marshall
AU - S. Paschalis
AU - J. Pereira
AU - X. Pereira-Lopez
AU - M. Petri
AU - R. Salinas
AU - A. Sanchez
AU - J. A. Swartz
AU - C. Tinson
AU - D. Weisshaar
AU - K. Wimmer
PY - 2026
DA - 2026/10/17
JO - Physical Review Letters
DO - 10.1103/r6ns-ypw8
UR - https://hal.science/hal-05775598v1
AB - The lifetime of the J π = 2 + state in the self-conjugate Ru 88 nucleus has been determined in an experiment performed using rare-isotope beams provided by the new Facility for Rare Isotope Beams. This is the heaviest N = Z nucleus for which such a measurement has been achieved. Ru 88 was populated by both one-neutron knockout and charge-exchange reactions, and the lifetime of 14.3 − 3.4 + 2.5 ps was determined using the triple-foil plunger technique. The extracted electromagnetic transition strength shows that the quadrupole collectivity has dropped significantly compared with the highly deformed N = Z region around A ∼ 80 . These results are compared with state-of-the-art large-scale shell-model and discrete nonorthogonal shell-model calculations. The theoretical calculations indicate a moderate triaxial deformation and suggest that low-lying states in this nucleus are no longer dominated by strong many-particle many-hole excitations, unlike the lighter, highly deformed N = Z nuclei nearby.
SN - 0031-9007
SN - 1079-7114
ER -