English

$l$-forbidden $\mathbf{M1}$ strengths near $^{100}$Sn from knockout reactions in Cd and Sn

Nuclear Experiment 2026-07-02 v1
Authors: T. J. Gray , K. L. Jones , R. Grzywacz , B. A. Brown , A. Gade , B. C. He , T. Miyagi , A. Peter , M. J. Basson , T. Beck , C. M. Campbell , G. Cerizza , J. Chung-Jung , I. Cox , P. Farris , R. Ghimire , S. Gillespie , M. Grinder , A. Hill , S. D. Pain , A. Palmisano-Kyle , K. P. Rykaczewski , D. Weisshaar , M. Williams
View on arXiv ↗ PDF ↗

Abstract

Neutron knockout reactions on beams of 104,102^{104,102}Cd, and 104^{104}Sn are presented. States in the residual 103,101^{103,101}Cd and 103^{103}Sn nuclei are populated, including low-lying 7/2+7/2^+ states of νg7/2\nu g_{7/2} character. These states have half-lives ≈400\approx 400 ps due to their low energy and hindered B(M1;7/2+→5/2+)B(M1; 7/2^+ \rightarrow 5/2^+) strengths. The excited-state half-lives were measured using their Doppler-shifted lineshapes, and the resulting B(M1)B(M1) strengths are compared to Valence Space In Medium Similarity Renormalization Group (VS-IMSRG) calculations. The VS-IMSRG calculations under-predict the ll-forbidden M1M1 strengths in the 100^{100}Sn region, as well as in other regions of the nuclear chart near 40^{40}Ca and 208^{208}Pb.

Keywords

neutron knockout 反应 $l$-禁戒 M1 强度 $^{100}$Sn VS-IMSRG 半衰期 核结构

Cite

@article{arxiv.2607.02184,
  title  = {$l$-forbidden $\mathbf{M1}$ strengths near $^{100}$Sn from knockout reactions in Cd and Sn},
  author = {T. J. Gray and K. L. Jones and R. Grzywacz and B. A. Brown and A. Gade and B. C. He and T. Miyagi and A. Peter and M. J. Basson and T. Beck and C. M. Campbell and G. Cerizza and J. Chung-Jung and I. Cox and P. Farris and R. Ghimire and S. Gillespie and M. Grinder and A. Hill and S. D. Pain and A. Palmisano-Kyle and K. P. Rykaczewski and D. Weisshaar and M. Williams},
  journal= {arXiv preprint arXiv:2607.02184},
  year   = {2026}
}

Comments

9 pages + 1 page supplementary material, 13 figures, accepted in PRC