Electromagnetic transition strength in 53Ca: the lifetime of the 5/2− state
Abstract
High-resolution in-beam γ-ray spectroscopy of 53Ca was performed at the Radioactive Isotope Beam Factory (RIBF) at RIKEN. Excited states in 53Ca were populated via one-neutron and one-proton removal reactions from a 55Sc radioactive beam, and the emitted γ rays were detected using the HiCARI hybrid germanium detector array. The lifetime of the first excited 5/2− state in 53Ca was measured for the first time through an analysis of Doppler-roadened γ-ray line shapes arising from relativistic recoil velocities. A lifetime of τ = 11.3−11.3+5.3(stat)+3(sys) ps was deduced, corresponding to a reduced transition probability of B(E2;5/2−→1/2−) > 2.6 e2fm4 at the 1σ level, with a best-fit value of 4.5 e2fm4. The measured transition strength is compared with state-of-the-art shell-model and ab initio calculations, providing a stringent benchmark for shell-model Hamiltonians and effective charges and modern ab initio descriptions of the neutron-rich calcium isotopes approaching the potential N = 40 shell closure.
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BibTeX
@misc{chen2026electromagnetic,
title = {{Electromagnetic transition strength in $^53$Ca: the lifetime of the $5/2^-$ state}},
author = {S. Chen and M. Petri and S. Paschalis and H. L. Crawford and P. Doornenbal and R. Taniuchi and K. Wimmer and B. A. Brown and J. D. Holt and B. S. Hu and T. Miyagi and T. Otsuka and Y. Tsunoda and N. Aoi and H. Baba and M. Bentley and F. Browne and C. Campbell and Z. Chen and R. Crane and H. de Witte and P. Fallon and C. Fransen and H. Hess and E. Ideguchi and S. Iwazaki and J. Kim and A. Kohda and T. Koiwai and W. Marshall and B. Mauss and B. Moon and T. Parry and P. Reiter and H. Sakurai and D. Suzuki and L. Tetley and S. Thiel and Y. Yamamoto},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.23754},
eprint = {2609.23754},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.23754},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Electromagnetic transition strength in ^53Ca: the lifetime of the 5/2^− state
AU - S. Chen
AU - M. Petri
AU - S. Paschalis
AU - H. L. Crawford
AU - P. Doornenbal
AU - R. Taniuchi
AU - K. Wimmer
AU - B. A. Brown
AU - J. D. Holt
AU - B. S. Hu
AU - T. Miyagi
AU - T. Otsuka
AU - Y. Tsunoda
AU - N. Aoi
AU - H. Baba
AU - M. Bentley
AU - F. Browne
AU - C. Campbell
AU - Z. Chen
AU - R. Crane
AU - H. de Witte
AU - P. Fallon
AU - C. Fransen
AU - H. Hess
AU - E. Ideguchi
AU - S. Iwazaki
AU - J. Kim
AU - A. Kohda
AU - T. Koiwai
AU - W. Marshall
AU - B. Mauss
AU - B. Moon
AU - T. Parry
AU - P. Reiter
AU - H. Sakurai
AU - D. Suzuki
AU - L. Tetley
AU - S. Thiel
AU - Y. Yamamoto
PY - 2026
DA - 2026/09/20
PB - arXiv
DO - 10.48550/arxiv.2609.23754
UR - https://arxiv.org/abs/2609.23754
AB - High-resolution in-beam γ-ray spectroscopy of ^53Ca was performed at the Radioactive Isotope Beam Factory (RIBF) at RIKEN. Excited states in ^53Ca were populated via one-neutron and one-proton removal reactions from a ^55Sc radioactive beam, and the emitted γ rays were detected using the HiCARI hybrid germanium detector array. The lifetime of the first excited 5/2^− state in ^53Ca was measured for the first time through an analysis of Doppler-roadened γ-ray line shapes arising from relativistic recoil velocities. A lifetime of τ = 11.3_−11.3^+5.3(stat)+3(sys) ps was deduced, corresponding to a reduced transition probability of B(E2;5/2^−→1/2^−) > 2.6 e^2fm^4 at the 1σ level, with a best-fit value of 4.5 e^2fm^4. The measured transition strength is compared with state-of-the-art shell-model and ab initio calculations, providing a stringent benchmark for shell-model Hamiltonians and effective charges and modern ab initio descriptions of the neutron-rich calcium isotopes approaching the potential N = 40 shell closure.
ER -