<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>l</mi></math>-forbidden <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>M</mi><mn>1</mn></mrow></math> strengths near <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Sn</mi><mprescripts></mprescripts><none></none><mn>100</mn></mmultiscripts></math> from knockout reactions in Cd and Sn

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

doi:10.1103/jd5v-hg3c

$l$ -forbidden $M 1$ strengths near ${}^{100}{Sn}$ from knockout reactions in Cd and Sn

T. J. Gray ^1,2,*, K. L. Jones ¹, R. Grzywacz¹, B. A. Brown ^3,4, A. Gade ^3,4, B. C. He ¹, T. Miyagi ⁵, A. Peter ¹, M. J. Basson ^3,4 et al.

T. Beck ^4,†, C. M. Campbell ⁶, G. Cerizza ⁴, J. Chung-Jung^3,4, I. Cox ¹, P. Farris^3,4, R. Ghimire ⁷, S. Gillespie ⁴, M. Grinder⁸, A. Hill^3,4, S. D. Pain^2,1, A. Palmisano-Kyle ¹, K. P. Rykaczewski², D. Weisshaar ⁴, and M. Williams ⁷

¹Department of Physics and Astronomy, University of Tennessee, Knoxville, Knoxville, Tennessee 37966, USA
²Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
³Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
⁴Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
⁵Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibraki 305-8577, Japan
⁶Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
⁷Lawrence Livermore National Laboratory, Livermore, California 94550, USA
⁸Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA

^*Contact author: tgray30@utk.edu
^†Present address: Instituut voor Kern- en Stralingsfysica, KU Leuven, 3001 Leuven, Belgium.

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Phys. Rev. C 114, 024305 – Published 3 August, 2026

DOI: https://doi.org/10.1103/jd5v-hg3c

Abstract

Neutron knockout reactions on beams of ${}^{104, 102}{Cd}$ and ${}^{104}{Sn}$ are presented. States in the residual ${}^{103, 101}{Cd}$ and ${}^{103}{Sn}$ nuclei are populated, including low-lying $7 / 2^{+}$ states of $ν g_{7 / 2}$ character. These states have half-lives $\approx 400$ ps due to their low energy and hindered $B (M 1; 7 / 2^{+} \to 5 / 2^{+})$ strengths. The excited-state half-lives were measured using their Doppler-shifted line shapes, and the resulting $B (M 1)$ strengths are compared to valence space in medium similarity renormalization group (VS-IMSRG) calculations. The VS-IMSRG calculations underpredict the $l$ -forbidden $M 1$ strengths in the ${}^{100}{Sn}$ region, as well as in other regions of the nuclear chart near ${}^{40}{Ca}$ and ${}^{208}{Pb}$ .

Physical Review C

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$l$ -forbidden $M 1$ strengths near ${}^{100}{Sn}$ from knockout reactions in Cd and Sn

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l-forbidden M1 strengths near Sn100 from knockout reactions in Cd and Sn

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$l$ -forbidden $M 1$ strengths near ${}^{100}{Sn}$ from knockout reactions in Cd and Sn