81 research outputs found
Evolution of deformation in neutron-rich Ba isotopes up to A=150
The occurrence of octupolar shapes in the Ba isotopic chain was recently established experimentally up to N = 90. To further extend the systematics, the evolution of shapes in the most neutron-rich members of the Z = 56 isotopic chain accessible at present, Ba-148,Ba-150, has been studied via beta decay at the ISOLDE Decay Station. This paper reports on the first measurement of the positive-and negative-parity low-spin excited states of 150Ba and presents an extension of the beta-decay scheme of Cs-148. Employing the fast timing technique, half-lives for the 2(1)(+) level in both nuclei have been determined, resulting in T-1/2 = 1.51(1) ns for Ba-148 and T-1/2 = 3.4(2) ns for Ba-150. The systematics of low-spin states, together with the experimental determination of the B(E2 : 2(+) -> 0(+)) transition probabilities, indicate an increasing collectivity in Ba148-150, towards prolate deformed shapes. The experimental data are compared to symmetry conserving configuration mixing (SCCM) calculations, confirming an evolution of increasingly quadrupole deformed shapes with a definite octupolar character.Peer reviewe
In-Sample and Out-of-Sample Prediction of Stock Market Bubbles: Cross-Sectional Evidence
Preparation methods and thermoelectric properties of PbTe based nanocomposites containing an inclusion phase
Designing CNC knit for hybrid membrane and bending active structures structural membranes 2015
Recent advances in computation allow for the integration of design and simulation
of highly interrelated systems, such as hybrids of structural membranes and bending active
elements. The engaged complexities of forces and logistics can be mediated through the
development of materials with project specific properties and detailing. CNC knitting with
high tenacity yarn enables this practice and offers an alternative to current woven membranes.
The design and fabrication of an 8m high fabric tower through an interdisciplinary team of
architects, structural and textile engineers, allowed to investigate means to design, specify,
make and test CNC knit as material for hybrid structures in architectural scale. This paper
shares the developed process, identifies challenges, potentials and future work
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