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

Sharma, K.; Morse, C.; Chowdhury, P.; Rogers, A.M.; Tarasov, O. B.; Haak, K.; Hoff, D.E.M.; Bender, P.C.; Baumann, T.; Bazin, D.; Chen, J.

doi:10.1103/PhysRevC.111.L031301

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

Technical Report · Fri Feb 21 04:00:00 EST 2025

DOI:https://doi.org/10.1103/PhysRevC.111.L031301· OSTI ID:2529408

Sharma, K. ^[1]; ^[1]; Chowdhury, P. ^[1]; Rogers, A.M. ^[1]; Tarasov, O. B. ^[1]; Haak, K. ^[1]; Hoff, D.E.M. ^[1]; Bender, P.C. ^[1]; Baumann, T. ^[1]; Bazin, D. ^[1]; Chen, J. ^[1]

Brookhaven National Laboratory (BNL), Upton, NY (United States)

High-spin isomers in very-neutron-rich A≈190 Hf-Ta-W nuclei were populated via the pioneering fragmentation of a ¹⁹⁸Pt 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 y rays, providing first level schemes using y-y 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 ¹⁸⁹Ta (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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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

DOE Contract Number:: SC0012704

OSTI ID:: 2529408

Report Number(s):: BNL--227614-2025-INRE

Country of Publication:: United States

Language:: English

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