Exploration for astromers near <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Sn</mi><mprescripts></mprescripts><none></none><mn>132</mn></mmultiscripts></math> with the Canadian Penning Trap

A. A. Valverde; S. Cupp; A. Gross; B. Liu; M. R. Mumpower; G. W. Misch; W. S. Porter; D. Ray; M. Brodeur; D. P. Burdette; N. Callahan; A. Cannon; J. A. Clark; A. T. Gallant; D. E. M. Hoff; A. M. Houff; K. Kolos; F. G. Kondev; O. S. Kubiniec; A. LaLiberte; G. E. Morgan; R. Orford; C. Quick; F. Rivero; D. Santiago-Gonzalez; G. Savard; N. D. Scielzo; K. S. Sharma; L. Varriano

doi:10.1103/p2lt-gchf

Exploration for astromers near ${}^{132}{Sn}$ with the Canadian Penning Trap

A. A. Valverde ^1,*,†, S. Cupp ^2,3, A. Gross ^2,3, B. Liu ^1,4, M. R. Mumpower ^5,4,6,3, G. W. Misch ⁷, W. S. Porter ⁴, D. Ray ^1,8,‡, M. Brodeur ⁴ et al.

D. P. Burdette¹, N. Callahan ¹, A. Cannon ^4,§, J. A. Clark ¹, A. T. Gallant⁹, D. E. M. Hoff ⁹, A. M. Houff ^1,4, K. Kolos ⁹, F. G. Kondev ¹, O. S. Kubiniec ¹, A. LaLiberte ^1,10, G. E. Morgan ^1,11,∥, R. Orford ¹², C. Quick ^4,¶, F. Rivero ⁴, D. Santiago-Gonzalez ¹, G. Savard ^1,10, N. D. Scielzo ⁹, K. S. Sharma ⁸, and L. Varriano ^1,10,**

¹Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
²Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
³Center for Theoretical Astrophysics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
⁴Department of Physics and Astronomy, University of Notre Dame, Notre Dame, Indiana 46556, USA
⁵Obsidian Research, Fort Wayne, Indiana 46835, USA
⁶Computational and Artificial Intelligence Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
⁷X Theoretical Design, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
⁸Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
⁹Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
¹⁰Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
¹¹Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
¹²Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

^*Contact author: avalverde@ikp.tu-darmstadt.de
^†Present Address: Institut für Kernphysik, TU Darmstadt, 64289 Darmstadt, Germany.
^‡Present address: TRIUMF, Vancouver, British Columbia, Canada V6T 2A3.
^§Present address: TRIUMF, Vancouver, British Columbia, Canada V6T 2A3; Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia, Canada V8W 3P6.
^∥Present address: Cyclotron Institute, Texas A&M University, College Station, TX 77843, USA.
^¶Present address: Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA.
^**Present address: Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, WA 98195, USA.

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Phys. Rev. C 113, 065803 – Published 11 June, 2026

DOI: https://doi.org/10.1103/p2lt-gchf

Abstract

Nuclear isomers can have significant impacts on astrophysical nucleosynthesis processes, with recent efforts demonstrating that the population of isomeric states with different half-lives may require separate treatment in reaction networks to accurately capture the differences in heating or in identifiable electromagnetic signals. Several potential so-called “astromers” in tin and antimony isotopes near doubly magic ${}^{132}{Sn}$ were identified and direct mass measurements of their ground and isomeric states were performed with the Canadian Penning Trap at Argonne National Laboratory's CARIBU facility, and their impact on astrophysical reaction rates and in reaction networks was calculated. It was found that ${}^{129 g, m}{Sn}$ , with measured mass excesses of $- 80 593.2 (25)$ and $- 80 557.4 (25)$ keV, respectively, and an excitation energy of 35.8(35) keV, behaves as an astromer during neutron capture in the $i$ -process and in the $r$ -process.

Physical Review C

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Exploration for astromers near ${}^{132}{Sn}$ with the Canadian Penning Trap

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Exploration for astromers near Sn132 with the Canadian Penning Trap

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Exploration for astromers near ${}^{132}{Sn}$ with the Canadian Penning Trap