Triaxiality near the $^{110}$Ru ground state from Coulomb excitation

D. Doherty (1) , J. Allmond (2) , R. Janssens (3) , W. Korten (1) , S. Zhu (3) , M. Zielinska (1) , D. Radford (2) , A. Ayangeakaa (3) , B. Bucher (4) , J. Batchelder (5) , W. Beausang (6) , C. Campbell (7) , M. Carpenter (3) , D. Cline (8) , H.L. Crawford (9) , M. David (3) , J. Delaroche (10) , C. Dickerson (3) , P. Fallon (7) , A. Galindo-Uribarri (2) , G. Kondev (11, 3) , J.L. Harker (3) , A. Hayes (8) , M. Hendricks (3) , P. Humby (6) , M. Girod (10) , J. Gross (2) , M. Klintefjord (2) , K. Kolos (12) , J. Lane (13) , T. Lauritsen (3) , J. Libert (10) , A. Macchiavelli (7) , J. Napiorkowski (14) , E. Padilla-Rodal (15) , R. Pardo (3) , W. Reviol (16) , D. Sarantites (16) , G. Savard (3) , D. Seweryniak (3) , J. Srebrny (14) , R. Varner (2) , R. Vondrasek (3) , A. Wiens (7) , E. Wilson (6) , J.L. Wood (17) , C.Y. Wu (4)

1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
2 Physics Division [Oak Ridge]
3 ANL - Argonne National Laboratory [Lemont]
4 LLNL - Lawrence Livermore National Laboratory
5 LBNL - Lawrence Berkeley National Laboratory [Berkeley]
6 Department of Physics, University of Richmond, VA
7 NSD - Nuclear Science Division [LBNL Berkeley]
8 University of Rochester [USA]
9 Ohio University
10 DAM/DIF - DAM Île-de-France
11 Chemistry and Biochemistry Department (University of Maryland)
12 IPNO - Institut de Physique Nucléaire d'Orsay
13 DNP - Department of Nuclear Physics
14 Heavy Ion Laboratory
15 Instituto de Ciencias Nucleares [Mexico]
16 Department of Chemistry [Seattle]
17 Georgia Institute of Technology [Atlanta]

A multi-step Coulomb excitation measurement with the GRETINA and CHICO2 detector arrays was carried out with a 430-MeV beam of the neutron-rich $^{110}$Ru (t$_{1/2}$= 12 s) isotope produced at the CARIBU facility. This represents the first successful measurement following the post-acceleration of an unstable isotope of a refractory element. The reduced transition probabilities obtained for levels near the ground state provide strong evidence for a triaxial shape; a conclusion confirmed by comparisons with the results of beyond-mean-field and triaxial rotor model calculations.

Mots clés: SHAPES; NEUTRON-RICH NUCLEI; QUADRUPOLE-MOMENTS; DEFORMED-NUCLEI; RU ISOTOPES; DEFORMATION; TRANSITION; CHIRALITY; ROTATION; FISSION

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

D. Doherty, J. Allmond, R. Janssens, W. Korten, S. Zhu, et al.. Triaxiality near the $^{110}$Ru ground state from Coulomb excitation. Physics Letters B, 2017, 766, pp.334 - 338. ⟨10.1016/j.physletb.2017.01.031⟩. ⟨cea-01538529⟩