First observation of excited states in 120La and its impact on the shape evolution in the A ≈ 120 mass region

• DOI: 10.1016/j.physletb.2024.138806
• Publication Date: 2024-06-20T17:11:26Z
• Authors: P.M. Jodidar; C.M. Petrache; B.F. Lv; E.A. Lawrie; A. Astier; S. Guo; K.K. Zheng; K. Auranen; A.D. Briscoe; T. Grahn; P.T. Greenlees; A. Illana; H. Joukainen; R. Julin; J. Louko; M. Luoma; H. Jutila; J. Ojala; J. Pakarinen; A.M. Plaza; P. Rahkila; P. Ruotsalainen; J. Sarén; A. Tolosa-Delgado; J. Uusitalo; G. Zimba; I. Kuti; A. Krakó; C. Andreoiu; D.T. Joss; R.D. Page; E.A. Cederlöf; A. Ertoprak
• Keywords: Spin and parity; QC1-999; measured γγγ-coincidences; Model calculation; -coincidences; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]; Recoil gated prompt coincidences; 530; 120La deduced levels; E= 255 MeV; Accelerator Laboratory; Measured γγγ-coincidences; E; ydinreaktiot; Eγ; model calculation; Iγ; Zn; La; angular correlations; spin and parity; Ni(; isotoopit; La deduced levels; recoil gated prompt coincidences; Physics; pn); Kiihdytinlaboratorio; I; Nuclear reaction:; Angular correlations; Nuclear reaction: 58Ni(64Zn,pn)120La; nuclear reaction:58Ni(64Zn,pn)120La; ydinfysiikka; Measured

Excited states have been observed for the first time in very neutron-deficient odd-odd nucleus 57120La63. The γ rays assigned based on coincidences with lanthanum X measured JUROGAM 3 array and A=120 fusion-evaporation residues MARA separator. form a rotational band which decays to ground state via cascade of four low-energy transitions. Based systematic comparisons heavier La isotopes we assign spin-parity 4+ πh11/2⊗νh11/2 configuration band. nuclear shape has investigated by cranked Nilsson-Strutinsky model. Two quasiparticle plus triaxial rotor model calculations including np interaction nicely reproduce spin inversion between even- odd-spin cascades E2 transitions, giving credit as an important parameter responsible mechanism inducing inversion. position Fermi levels, particular neutrons, also strong impact chain nuclei.