Experimental Study Of The Exotic Motion In Odd-A Nuclei ¹¹⁹Sb

Nuclei close to the Z = 50 magic number usually exhibit single-particle struc-tures that coexist with collective structures based on proton excitations across the Z = 50 shell gap.In addition,some interesting nuclear structure phenomena such as magnetic rotation usually found in nearly spherical nuclei,collective ro-tational band and superdeformed bands usually found in deformed nuclei,and so,on,are also observed in these nulcei.Therefore,nuclei near Z = 50 closed shells represent an excellent opportunity to probe important facets of nuclear structure and have attracted considerable attention.The present work is a part of our systematic study of high-spin states with nuclei near the magic number Z = 50.The aim of this work is to study the energy spectra structures of ¹¹⁹Sb.The off-line data are analyzed in the present work from three different exper-iments.All of them are performed via the fusion-evaporatio1 reaction ¹¹⁶Cd?⁷Li,⁴n?¹¹⁹Sb using beam energy of 34 MeV in 2011,42 MeV in 2013 and 50 MeV in 2008,respectively,provided by the HI-13 tandem accelerator at the China Institute of Atomic Energy?CIAE?in Beijing.The three different experiments lasted 80,70,and 100 hours,respectively.Eventually,a total of 430 million events were collected and ensured the datas could cover low,medium and high states of 11sSb.The present work confirms most of the previously known levels and transi-tions in ¹¹⁹Sb.In addition,a total of 40 new transitions and 20 new levels have been identified and added to the level scheme of 199Sb,which includes a newly ob-served band.The level scheme of ¹¹⁹Sb exhibit collective structures that coexist with single-particle structures.The low-lying single-particle states in 119 Sb can be well described in terms of a simple coupling of the valence proton out of Z = 50 shell closure occupying ?d_5/2,?g7/2 and ?h_11/2 orbitals to the corresponding states in ¹¹⁸Sn core.For the rotational bands,we study systematic character of experi-ment results and perform theoretical calculations based on TAC-CDFT and the triaxial particle rotor model?TPRM?.The results indicate that the newly obsered band and already identified band with ?g_9/2^-1(g_7/2)²???v(d_3/2)²d_5/2h_11/2 configu-rations are proposed to be multiple chiral doublet due to the breaking of chiral geometry;the positive-parity coupled bands with 7rg_9/2^-12(g_7/2)²???v(d_3/2)²(h_11/2)² configurations and ?g_9/2^-1(g_7/2)²h_11/2h_11/2 configurations are electric and magnetic rotational band,respectively;the decoupled bands respectively with?d_5/2(g_9/2)-2(d_5/2g_7/2)²v(d_3/2)²(h_11/2)² and ?h_11/2(g_9/2)-2(d_5/2g_7/2)²v(d_3/2)²(h_11/2)² configurations are antimagnetic rotational bands.It's worth mentioning that three strong E1 transitions betweel the positive-parity coupled band with ?g_9/2^-1(g_7/2)²???v(d_3/2)²(h_11/2)² configurations and the negative-parity coupled band with ?g_9/2^-1(g_7/2)²???v(d_3/2)²(d_5/2h_11/2 configurations,which indicates the existence of octupole corre-lation in ¹¹⁹Sb.In conclusion,the study results of this present work indicate that single-particle structures,electric rotation,magnetic rotation,anti-magnetic rotation,multiple chiral doublet and octupole correlation that coexist with in the level scheme of ¹¹⁹Sb.A number of motion models firstly observed in a single nuclear,which suggest the diversity of nuclei motion models.