90 research outputs found
Shape coexistence in neutron-deficient Hg-188 investigated via lifetime measurements
Shape coexistence in the region has been established in
mercury, lead and polonium isotopes. Even-even mercury isotopes with present multiple fingerprints of this phenomenon, which seems to be
no longer present for . According to a number of theoretical
calculations, shape coexistence is predicted in the Hg isotope. The
Hg nucleus was populated using two different fusion-evaporation
reactions with two targets, Gd and Gd, and a beam of S,
provided by the Tandem-ALPI accelerators complex at the Laboratori Nazionali di
Legnaro. The channels of interest were selected using the information from the
Neutron Wall array, while the rays were detected using the GALILEO
-ray array. The lifetimes of the excited states were determined using
the Recoil Distance Doppler-Shift method, employing the dedicated GALILEO
plunger device. Using the two-bands mixing and rotational models, the
deformation of the pure configurations was obtained from the experimental
results. The extracted transition strengths were compared with those calculated
with the state-of-the-art symmetry-conserving configuration-mixing (SCCM) and
five-dimentional collective Hamiltonian (5DCH) approaches in order to shed
light on the nature of the observed structures in the Hg nucleus. An
oblate, a normal- and a super-deformed prolate bands were predicted and their
underlying shell structure was also discussed.Comment: v1: 13 pages, 10 figures, comparison between IBM-CM and SCCM
calculations; v2: 16 pages, 13 figures, discussion on the mixing amplitudes
from the experimental B(E2) values, comparison between SCCM and 5DCH
calculation
Single-particle states in \{\} Zn populated in single-neutron transfer reaction \{\} Zn (d, p)
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