Probing the quantum phase transition near <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>N</mi><mo>≈</mo><mn>60</mn></mrow></math> via mass measurements of technetium isotopes

J. Ruotsalainen; A. Jaries; M. Stryjczyk; A. Kankainen; B. Andel; M. Araszkiewicz; O. Beliuskina; A. M. 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

Probing the quantum phase transition near $N \approx 60$ via mass measurements of technetium isotopes

J. Ruotsalainen ^1,*,†, A. Jaries ^1,2,*,‡,§, M. Stryjczyk ^1,3,*,∥, A. Kankainen ^1,¶, B. Andel ⁴, M. Araszkiewicz^5,6, O. Beliuskina¹, A. M. Bruce ⁷, S. Cannarozzo ⁸ et al.

S. Chinthakayala ^1,9, S. Doshi ⁷, T. Eronen ¹, A. Fijałkowska⁵, L. M. Fraile ^10,**, P. Garczyński ⁵, Z. Ge ¹, D. Grigorova ¹¹, G. Jaworski ¹², A. Korgul ⁵, T. Krakowski ⁶, J. Kurpeta ⁵, S. Lalkovski¹¹, M. Llanos Expósito ¹⁰, I. D. Moore ¹, L. M. Motilla^1,9, M. Mougeot ¹, H. Penttilä ¹, A. Raggio¹, W. Rattanasakuldilok ¹, J. Saren ¹, and K. Solak ⁵

¹Department of Physics, University of Jyväskylä, Accelerator Laboratory, P.O. Box 35(YFL) FI-40014 University of Jyväskylä, Finland
²Max-Planck-Institut Für Kernphysik, Heidelberg 69117, Germany
³Institut Laue-Langevin, 71 Avenue des Martyrs, F-38042 Grenoble, France
⁴Department of Nuclear Physics and Biophysics, Comenius University in Bratislava, 84248 Bratislava, Slovakia
⁵Faculty of Physics, University of Warsaw, PL 02-093 Warsaw, Poland
⁶National Centre for Nuclear Research, PL 05-400 Świerk-Otwock, Poland
⁷School of Architecture, Technology and Engineering, University of Brighton, Brighton BN2 4GJ, United Kingdom
⁸Department of Physics and Astronomy, Uppsala University, Uppsala 75120, Sweden
⁹GANIL, CEA/DSM-CNRS/IN2P3, Boulevard Henri Becquerel, 14000 Caen, France
¹⁰Grupo de Física Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, 28040 Madrid, Spain
¹¹Faculty of Physics, Sofia University ”St. Kliment Ohridski”, 1164 Sofia, Bulgaria
¹²Heavy Ion Laboratory, University of Warsaw, PL-02-093 Warsaw, Poland

^*These authors contributed equally to this work.
^†Contact author: jouni.k.a.ruotsalainen@jyu.fi
^‡Contact author: arthur.jaries@cern.ch
^§Present address: Max-Planck-Institut Für Kernphysik, Heidelberg 69117, Germany.
^∥Contact author: stryjczyk@ill.fr
^¶Contact author: anu.kankainen@jyu.fi
^**Present address: CERN, CH-1211, Geneva 23, Switzerland.

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Phys. Rev. C 112, 064302 – Published 1 December, 2025

DOI: https://doi.org/10.1103/kksz-prtb

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 $Q_{β}$ 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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Probing the quantum phase transition near $N \approx 60$ via mass measurements of technetium isotopes

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Probing the quantum phase transition near N≈60 via mass measurements of technetium isotopes

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Probing the quantum phase transition near $N \approx 60$ via mass measurements of technetium isotopes