New insight into the shape coexistence and shape evolution ofYb157

Collision system size scan of collective flows in relativistic heavy-ion collisions

“…β extracted by using equation (4) from the response of v n to ε n is higher than that in Ref. [77], and β from v 4,22 /ε 4,22 is closer to that. Note that this maybe result from different methods and difference parameter setting in previous AMPT result [77] ( √ s N N = 2.76 TeV, µ=3.2 f m −1 ) and in this work ( √ s N N = 6.73 TeV, µ=2.3f m −1 ), here µ is the screening mass in the partonic matter.…”

“…[77], and β from v 4,22 /ε 4,22 is closer to that. Note that this maybe result from different methods and difference parameter setting in previous AMPT result [77] ( √ s N N = 2.76 TeV, µ=3.2 f m −1 ) and in this work ( √ s N N = 6.73 TeV, µ=2.3f m −1 ), here µ is the screening mass in the partonic matter. These results indicate that it should be investigated in experiment for energy dependence of β and the response of collective flow to initial asymmetry for higher-order nonlinear mode.…”

“…In Ref. [77] the ratio of shear viscosity to entropy was estimated to be 0.273 in Pb+Pb collisions at √ s N N =2.76 TeV. β extracted by using equation (4) from the response of v n to ε n is higher than that in Ref.…”

Spectroscopy ofYb155: Structure evolution in theN=85isotones

“…The underlying reason for this gradual decrease has been discussed in Ref. [7]. In this mass region, the strong attractive interaction between spin-orbit partner orbitals πh 11/2 and νh 9/2 as well as the relatively weaker attractive interaction between the πh 11/2 and νi 13/2 configurations will result in the onset of nuclear deformation [26].…”

“…For instance, with N decreasing from 88 to 84, 158 Yb shows the behavior of soft rotation [1]; 156 Yb undergoes an evolution from a quasivibrational to quasirotational structure with increasing spin [2,3]; and 154 Yb is interpreted in terms of the quasiparticle coupling [4,5]. For the odd-A Yb isotopes in this transitional region, collective structures built on the f 7/2 , h 9/2 , and i 13/2 neutron orbitals have been observed in 157 Yb [6,7] and the coexistence of different nuclear shapes has been revealed. With fewer valence neutrons outside the N = 82 closed shell, the structure information on 155 Yb is still scarce.…”