Mass of 101Sn and Bayesian extrapolations to the proton drip line

Ireland CM, Bollen G, Campbell SE, Chen X, Erington H, Gamage ND, Godbey K, Houff AM, Izzo C, Knight B, Lalit S, Leistenschneider E, Lykiardopoulou EM, Maier FM, Nazarewicz W, Orford R, Porter WS, Quick C, Ravlić A, Redshaw M, Reinhard PG, Ringle R, Schwarz S, Sumithrarachchi CS, Valverde AA, Villari AC (2026)

Publication Type: Journal article

Publication year: 2026

Journal

Physical Review C American Physical Society (APS)

Book Volume: 113

Article Number: L021302

Journal Issue: 3

DOI: 10.1103/VZ5K-YF93

Abstract

The favorable energy configurations of nuclei at magic numbers of N neutrons and Z protons are fundamental for understanding the evolution of nuclear structure. The Z = 50 (tin) isotopic chain is a frontier for such studies, with particular interest at and around the doubly magic 100Sn isotope, for which the mass is a topic of debate. Precise mass values for neutron-deficient isotopes provide necessary anchor points for mass models to test extrapolations near the proton drip line, where experimental studies remain out of reach. In this work, we report a Penning trap mass measurement of 101Sn. The determined mass excess of −59 889.89(96) keV for 101Sn represents a factor-of-300 improvement over the current precision and indicates that 101Sn is less bound than previously thought. Mass predictions from a recently developed Bayesian model combination framework employing statistical machine learning and nuclear masses computed within seven global models based on nuclear density functional theory agree within 1σ with experimental masses from the 48 ≼ Z ≼ 52 isotopic chains. The framework’s resilience to new mass data gave confidence in the extrapolation of tin masses down to N = 46. Our calculations suggest that 96Sn is a two-proton drip line nucleus and predict a mass excess of −58 090(800) keV for 100Sn, showing a preference within 1σ for the mass of 100Sn derived from the β-delayed Q value measured at GSI.

Authors with CRIS profile

Paul-Gerhard Reinhard Naturwissenschaftliche Fakultät

Involved external institutions

Lawrence Berkeley National Laboratory (LBNL) US United States (USA) (US) Michigan State University US United States (USA) (US) University of Notre Dame du Lac US United States (USA) (US) Argonne National Laboratory US United States (USA) (US)

How to cite

APA:

Ireland, C.M., Bollen, G., Campbell, S.E., Chen, X., Erington, H., Gamage, N.D.,... Villari, A.C. (2026). Mass of 101Sn and Bayesian extrapolations to the proton drip line. Physical Review C, 113(3). https://doi.org/10.1103/VZ5K-YF93

MLA:

Ireland, C. M., et al. "Mass of 101Sn and Bayesian extrapolations to the proton drip line." Physical Review C 113.3 (2026).

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