Direct measurement of Enhanced octupole collectivity in 148Dy
Abstract
Excited states in 148 66Dy were populated via β+/EC decay of 148mHo using the GRIFFIN spectrometer at the TRIUMF ISAC-I facility. A combined measurement of the mean lifetime of the 31- level using the Generalized Centroid Difference (GCD) method and branching fraction of the 31-→01+ γ-ray decay has been performed. From these results, an enhanced electric octupole B(E3;31-→01+) transition strength of 46(3)~W.u. has been determined in 148 66Dy. This is the largest measured value across the closed neutron shell at N=82 and provides direct evidence of enhanced octupole collectivity beyond Z=64. The evolution of the B(E3; 3-1 → 0+1) strength along the N=82 isotonic chain is compared with quasiparticle random-phase approximation (QRPA) calculations using the SkI3 and SkM* Skyrme energy-density functionals, as well as with large-scale shell-model (SM) calculations. This result extends the boundaries of enhanced octupole collectivity far from the so-called `octupole magic numbers' Z=56 and N=88.
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BibTeX
@misc{spagnoletti2026direct,
title = {{Direct measurement of Enhanced octupole collectivity in 148Dy}},
author = {P. Spagnoletti and V. Vedia and E. Yuksel and Y. X. Yu and G. J. Fu and R. Umashankar and G. Andreetta and C. Andreoiu and A. A. Avaa and G. C. Ball and V. Bildstein and S. Buck and E. Cantacuzene and G. Colombi and I. Dillmann and L. P. Gaffney and A. B. Garnsworthy and P. E. Garrett and G. F. Grinyer and G. Hackman and J. Liu and A. Ludlam and L. L. Luperi and Madhu and T. La Marca and D. Movilla-Quintero and S. Murillo Morales and R. Nicolas del Alamo and M. M. Rajabali and P. H. Regan and M. Rocchini and M. Scheck and J. Seger and S. Sekal and D. Stramaccioni and C. E. Svensson and A. Tsantiri and J. Williams and F. Wu},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.21499},
eprint = {2609.21499},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.21499},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Direct measurement of Enhanced octupole collectivity in 148Dy
AU - P. Spagnoletti
AU - V. Vedia
AU - E. Yuksel
AU - Y. X. Yu
AU - G. J. Fu
AU - R. Umashankar
AU - G. Andreetta
AU - C. Andreoiu
AU - A. A. Avaa
AU - G. C. Ball
AU - V. Bildstein
AU - S. Buck
AU - E. Cantacuzene
AU - G. Colombi
AU - I. Dillmann
AU - L. P. Gaffney
AU - A. B. Garnsworthy
AU - P. E. Garrett
AU - G. F. Grinyer
AU - G. Hackman
AU - J. Liu
AU - A. Ludlam
AU - L. L. Luperi
AU - Madhu
AU - T. La Marca
AU - D. Movilla-Quintero
AU - S. Murillo Morales
AU - R. Nicolas del Alamo
AU - M. M. Rajabali
AU - P. H. Regan
AU - M. Rocchini
AU - M. Scheck
AU - J. Seger
AU - S. Sekal
AU - D. Stramaccioni
AU - C. E. Svensson
AU - A. Tsantiri
AU - J. Williams
AU - F. Wu
PY - 2026
DA - 2026/09/18
PB - arXiv
DO - 10.48550/arxiv.2609.21499
UR - https://arxiv.org/abs/2609.21499
AB - Excited states in ^148_ 66Dy were populated via β^+/EC decay of ^148mHo using the GRIFFIN spectrometer at the TRIUMF ISAC-I facility. A combined measurement of the mean lifetime of the 3_1^- level using the Generalized Centroid Difference (GCD) method and branching fraction of the 3_1^-→0_1^+ γ-ray decay has been performed. From these results, an enhanced electric octupole B(E3;3_1^-→0_1^+) transition strength of 46(3)~W.u. has been determined in ^148_ 66Dy. This is the largest measured value across the closed neutron shell at N=82 and provides direct evidence of enhanced octupole collectivity beyond Z=64. The evolution of the B(E3; 3^-_1 → 0^+_1) strength along the N=82 isotonic chain is compared with quasiparticle random-phase approximation (QRPA) calculations using the SkI3 and SkM^* Skyrme energy-density functionals, as well as with large-scale shell-model (SM) calculations. This result extends the boundaries of enhanced octupole collectivity far from the so-called `octupole magic numbers' Z=56 and N=88.
ER -