Probing the quantum phase transition around $N\approx60$ via mass measurements of technetium isotopes

J. Ruotsalainen; A. Jaries; M. Stryjczyk; A. Kankainen; B. Andel; M. Araszkiewicz; O. Beliuskina; A. Bruce; S. Cannarozzo; S. Chinthakayala; S. Doshi; T. Eronen; A. Fijałkowska; L. M. Fraile; P. Garczyński; Z. Ge; D. Grigorova; G. Jaworski; A. Korgul; T. Krakowski; J. Kurpeta; S. Lalkovski; M. Llanos Expósito; I. D. Moore; L. M. Motilla; M. Mougeot; H. Penttilä; A. Raggio; W. Rattanasakuldilok; J. Saren; K. Solak

doi:10.1103/kksz-prtb

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arXiv · 2505.15625

Probing the quantum phase transition around $N\approx60$ via mass measurements of technetium isotopes

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Abstract

The masses of neutron-rich $^{104-106}$Tc isotopes were measured using the JYFLTRAP double Penning trap and found to deviate from the Atomic Mass Evaluation 2020 by $-79(25)$, $40(12)$ and $94(41)$ keV, respectively. In the case of $^{105,106}$Tc, the updated $Q_\beta$ values are in agreement with a previous JYFLTRAP measurement, disagreeing with the values from the mass evaluation. The new mass values result in a more linear trend in two-neutron separation energies indicating that technetium ($Z=43$) isotopes around $N \approx 60$ are not a part of the island of shape coexistence around $^{100}$Zr$_{60}$.

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J. Ruotsalainen, A. Jaries, M. Stryjczyk, A. Kankainen, B. Andel, M. Araszkiewicz, O. Beliuskina, A. Bruce, S. Cannarozzo, S. Chinthakayala, S. Doshi, T. Eronen, A. Fijałkowska, L. M. Fraile, P. Garczyński, Z. Ge, D. Grigorova, G. Jaworski, A. Korgul, T. Krakowski, J. Kurpeta, S. Lalkovski, M. Llanos Expósito, I. D. Moore, L. M. Motilla, M. Mougeot, H. Penttilä, A. Raggio, W. Rattanasakuldilok, J. Saren, K. Solak. 2025-05-21. Probing the quantum phase transition around $N\approx60$ via mass measurements of technetium isotopes. https://doi.org/10.1103/kksz-prtb

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