Coulomb excitation of Yb nuclei

Detailed spectroscopy of quadrupole and octupole states inYb168

“…----------PT dp 3/32 2 HP) = EH(P), (9 ) where u(P) is the infinite-square-well potential with bound aries at pM ^ pm ^ 0. The ratio rp = pm/p M parameterizes the width of the potential.…”

“…Having the ratio between the energy of the first 4+ state and the energy of the first 2+ state (/?4/2 ratio) of 3.27 (close to the rotational limit of 3.33) l68Yb should display most of the characteristic features of an axial rotor. The structure of this nucleus has been intensively investigated in recent years using a wide range of experimental methodsincluding /S-decay studies [1][2][3], heavy ion reactions [4][5][6], transfer reactions [7,8], Coulomb excitation [9], and neutroninduced reactions [10]-establishing several band structures such as the /3-and y-vibrational bands. These studies mostly concentrated on investigating the positive-parity states at low and medium spins.…”

Characterization of the β vibration and 0+2states in deformed nuclei

“…The ytterbium isotopes 168,170 Yb present interesting cases. For 168 Yb, the B(E2) value of 1.8(2) spu [29] indicates some collectivity. The B(E2; 0 + 2 → 2 + gsb ) value has also been measured [29] to be 14 (5) wu.…”

Low-spin collective excitations in deformed nuclei: When is a β a β vibration?

“…For 168 Yb, the B(E2) value of 1.8(2) s.p.u. [10] indicates some collectivity. The B(E2; 0 + 2 → 2 + gsb ) value has also been measured [10] to be 14(5) W.u.…”

“…[10] indicates some collectivity. The B(E2; 0 + 2 → 2 + gsb ) value has also been measured [10] to be 14(5) W.u. The ρ 2 (E0) value of 30(7)×10 −3 [3] is somewhat small, but the fact that it was not observed in the (p, t) reaction and the enhanced B(E2) values make it an attractive candidate for a significant fraction of the β-vibrational strength.…”