Reaching the prolate-oblate boundary at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>N</mi><mo>=</mo><mn>116</mn></mrow></math> via first fragmentation of a <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Pt</mi><mprescripts></mprescripts><none></none><mn>198</mn></mmultiscripts></math> beam: Sharp transition to triaxiality in <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Ta</mi><mprescripts></mprescripts><none></none><mn>189</mn></mmultiscripts></math>

K. Sharma; P. Chowdhury; A. M. Rogers; O. B. Tarasov; K. Haak; D. E. M. Hoff; P. C. Bender; T. Baumann; D. Bazin; J. Chen; A. Estradé; M. A. Famiano; D. C. Foulds-Holt; N. Fukuda; A. Gade; T. Ginter; M. Hausmann; A. M. Hill; L. Klankowski; E. Kwan; J. Li; S. Liddick; B. Longfellow; S. Lyons; C. Morse; M. Portillo; D. Rhodes; A. L. Richard; S. Samaranayake; M. K. Smith; M. Spieker; C. Sumithrarachchi; H. Suzuki; K. Wang; S. Waniganeththi; D. Weisshaar; S. Zhu

doi:10.1103/PhysRevC.111.L031301

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Reaching the prolate-oblate boundary at $N = 116$ via first fragmentation of a ${}^{198}{Pt}$ beam: Sharp transition to triaxiality in ${}^{189}{Ta}$

K. Sharma ^1,*,†, P. Chowdhury ^1,‡, A. M. Rogers ¹, O. B. Tarasov ², K. Haak ^2,3, D. E. M. Hoff ^1,§, P. C. Bender ¹, T. Baumann ², D. Bazin ^2,3 et al.

J. Chen², A. Estradé ⁴, M. A. Famiano ⁵, D. C. Foulds-Holt^1,∥, N. Fukuda⁶, A. Gade ^2,3, T. Ginter ², M. Hausmann ², A. M. Hill ^2,3, L. Klankowski ^5,¶, E. Kwan ², J. Li², S. Liddick^2,7, B. Longfellow^2,3,§, S. Lyons ^2,#, C. Morse ⁸, M. Portillo², D. Rhodes ^2,3,§, A. L. Richard ^2,**, S. Samaranayake^4,††, M. K. Smith², M. Spieker ^2,‡‡, C. Sumithrarachchi², H. Suzuki⁶, K. Wang ^4,§§, S. Waniganeththi ^1,∥∥, D. Weisshaar ², and S. Zhu^9,¶¶

¹Department of Physics & Applied Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA
²Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
³Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
⁴Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
⁵Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA
⁶RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
⁷Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
⁸Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
⁹National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York 11973, USA

^*Contact author: ksharma2@triumf.ca
^†Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
^‡Contact author: partha_chowdhury@uml.edu
^§Present address: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
^∥Present address: University of Cambridge, Cavendish Laboratory, United Kingdom.
^¶Present address: Department of Physics, University of Michigan, 1239 Kipke Drive, Ann Arbor, MI, 48109, USA.
^#Present address: Pacific Northwest National Laboratory, Richland, WA 99352, USA.
^**Present address: Department of Physics and Astronomy, Ohio University, Athens, OH 45701, USA.
^††Present address: Department of Physics, Western Michigan University Kalamazoo, Michigan 49008, USA.
^‡‡Present address: Department of Physics, Florida State University, Tallahassee, Florida, 32306, USA.
^§§Present address: Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.
^∥∥Present address: National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York 11973, USA.
^¶¶Deceased.

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Phys. Rev. C 111, L031301 – Published 18 March, 2025

DOI: https://doi.org/10.1103/PhysRevC.111.L031301

Abstract

High-spin isomers in very-neutron-rich $A \approx 190$ Hf-Ta-W nuclei were populated via the pioneering fragmentation of a ${}^{198}{Pt}$ primary beam at the National Superconducting Cyclotron Laboratory. The nuclei were implanted in a Si detector stack surrounded by the Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA) to detect delayed $γ$ rays, providing first level schemes using $γ − γ$ coincidence data from isomeric decays in this previously inaccessible region of the nuclear chart. A sudden transition to a strong triaxial shape is observed in the very-neutron-rich ${}^{189}{Ta}$ $(N = 116)$ nucleus from axially prolate shapes in lighter Ta isotopes, providing a critical experimental benchmark for competing theoretical predictions of nuclear-shape evolution.

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Reaching the prolate-oblate boundary at $N = 116$ via first fragmentation of a ${}^{198}{Pt}$ beam: Sharp transition to triaxiality in ${}^{189}{Ta}$

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Reaching the prolate-oblate boundary at N=116 via first fragmentation of a Pt198 beam: Sharp transition to triaxiality in Ta189

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Reaching the prolate-oblate boundary at $N = 116$ via first fragmentation of a ${}^{198}{Pt}$ beam: Sharp transition to triaxiality in ${}^{189}{Ta}$