First identification of excited states in 78Zr and implications for isospin nonconserving forces in nuclei

G. L. Zimba*, P. Ruotsalainen, D. G. Jenkins, W. Satuła, J. Uusitalo, R. Wadsworth, X. Pereira Lopez, K. Auranen, A. D. Briscoe, B. Cederwall, S. Chen, G. de Angelis, M. Doncel, A. Ertoprak, T. Grahn, P. T. Greenlees, A. Illana, H. Joukainen, R. Julin, H. JutilaJ. Keatings, J. Louko, M. Luoma, A.M. Plaza, J. Sarén, B. S. Nara Singh, J. Ojala, J. Pakarinen, P. Rahkila, J. Romero, A. Sood, A. Stott, C. Sullivan, H. Tann, A. Tolosa Delgado

*Corresponding author for this work

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Abstract

At a fundamental level, the interactions between protons and protons, protons and neutrons, and neutrons and neutrons are not identical. Such isospin nonconserving interactions emerge when comparing the excitation energy of analog states in 𝑇=1 triplet nuclei. Here, we extend such an analysis to the 𝐴 =78, 𝑇 =1 triplet system—the heaviest system for which such complete data exists—and find strong disagreement with contemporary theory. This was achieved by pioneering the technique of recoil-𝛽−𝛽 tagging to identify excited states in 78Zr . We also established a 78Zr
half-life of 25+17 −8  ms and extended the 𝑇 =1 band in 78Y
to 𝐽𝜋=(10+).
Original languageEnglish
Article number022502
Number of pages8
JournalPhysical Review Letters
Volume134
DOIs
Publication statusPublished - 14 Jan 2025

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