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Magnetic character of the low-energy enhancement in 70Zn

E. K. RonningIstituto Nazionale di Fisica Nucleare, Sezione di Padova, Padua, Italy. [email protected]A. L. RichardDepartment of Physics and Astronomy, Ohio University, Athens, OH, USAS. N. LiddickDepartment of Chemistry, Michigan State University, East Lansing, MI, USAA. SpyrouFacility for Rare Isotope Beams, East Lansing, MI, USAR. RingleFacility for Rare Isotope Beams, East Lansing, MI, USAH. AroraCenter for Exotic Nuclear Studies, Institute for Basic Science, Daejeon, Republic of KoreaH. C. BergDepartment of Physics and Astronomy, Michigan State University, East Lansing, MI, USAJ. M. BerkmanFacility for Rare Isotope Beams, East Lansing, MI, USAD. L. BleuelLawrence Livermore National Laboratory, Livermore, CA, USAK. BosmpotinisFacility for Rare Isotope Beams, East Lansing, MI, USAS. E. CampbellDepartment of Physics and Astronomy, Michigan State University, East Lansing, MI, USAX. ChenFacility for Rare Isotope Beams, East Lansing, MI, USAB. P. CriderDepartment of Physics and Astronomy, Mississippi State University, Mississippi State, MS, USAR. J. ColemanDepartment of Physics, University of Guelph, Guelph, Ontario, CanadaP. DeYoungHope College, Holland, MI, USAA. A. DoetschFacility for Rare Isotope Beams, East Lansing, MI, USAH. EringtonFacility for Rare Isotope Beams, East Lansing, MI, USAT. GaballahDepartment of Physics and Astronomy, Mississippi State University, Mississippi State, MS, USAN. D. GamageFacility for Rare Isotope Beams, East Lansing, MI, USAE. C. GoodPacific Northwest National Laboratory, Richland, WA, USAB. GreavesDepartment of Physics, University of Guelph, Guelph, Ontario, CanadaA. C. HartleyDepartment of Computer Science, University of Mount Union, Alliance, OH, USAJ. HuffmanDepartment of Physics and Astronomy, Michigan State University, East Lansing, MI, USAC. M. IrelandFacility for Rare Isotope Beams, East Lansing, MI, USAC. IzzoFacility for Rare Isotope Beams, East Lansing, MI, USAR. JainLawrence Livermore National Laboratory, Livermore, CA, USAA. C. LarsenDepartment of Physics, University of Oslo, Oslo, NorwayJ. E. L. LarssonGSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, GermanyR. S. LubnaFacility for Rare Isotope Beams, East Lansing, MI, USAF. M. MaierFacility for Rare Isotope Beams, East Lansing, MI, USAM. J. MogannamAir Force Institute of Technology, Dayton, OH, USAD. MücherInstitute for Nuclear Physics, University of Cologne, Cologne, GermanyM. R. MumpowerCenter for Theoretical Astrophysics, Los Alamos, NM, USAG. Owens-FryarFacility for Rare Isotope Beams, East Lansing, MI, USAT. H. OgunbekuLawrence Livermore National Laboratory, Livermore, CA, USAD. P. ScrivenFacility for Rare Isotope Beams, East Lansing, MI, USAM. K. SmithFacility for Rare Isotope Beams, East Lansing, MI, USAC. S. SumithrarachchiFacility for Rare Isotope Beams, East Lansing, MI, USAA. SweetLawrence Livermore National Laboratory, Livermore, CA, USAK. TaftFacility for Rare Isotope Beams, East Lansing, MI, USAA. TsantiriDepartment of Physics and Astronomy, Michigan State University, East Lansing, MI, USAS. UthayakumaarFacility for Rare Isotope Beams, East Lansing, MI, USAM. WiedekingNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

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The transition of an atomic nucleus from an excited state to a state of lower energy is typically accompanied by the emission of photons. The likelihood of photon emission is a function of the photon energy and of properties of the initial and final nuclear states and is known as the photon (or γ-ray) strength function (γSF)1,2. Of the features present in the γSF, an enhancement in the low-energy region has been observed in some nuclei, but the electromagnetic nature of this enhancement remains an open question3,4. This low-energy enhancement in the γSF significantly impacts our understanding of how elements are created in stars and the structure of the nucleus5,6. Here we present the results from an experiment on the γSF of 70Zn that show that the enhancement in the γSF of this nucleus is of magnetic nature. This observation helps address a long-open question about γSFs in atomic nuclei and directly impacts our predictive capabilities in nuclear science. The low-energy enhancement in the γ-ray strength function of 70Zn is due to magnetic dipole transitions between nuclear states.

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DOI: 10.1038/s41586-026-10758-3

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