2,045 research outputs found
Systematics of intermediate-energy single-nucleon removal cross sections
Get PDFThere is now a large and increasing body of experimental data and theoretical
analyses for reactions that remove a single nucleon from an intermediate-energy
beam of neutron- or proton-rich nuclei. In each such measurement, one obtains
the inclusive cross section for the population of all bound final states of the
mass A-1 reaction residue. These data, from different regions of the nuclear
chart, and that involve weakly- and strongly-bound nucleons, are compared with
theoretical expectations. These calculations include an approximate treatment
of the reaction dynamics and shell-model descriptions of the projectile initial
state, the bound final states of the residues, and the single-particle
strengths computed from their overlap functions. The results are discussed in
the light of recent data, more exclusive tests of the eikonal dynamical
description, and calculations that take input from more microscopic nuclear
structure models.Comment: 4 pages, 1 figure, with reference correcte
Nuclear Astrophysics with Radioactive Beams
Full text linkThe quest to comprehend how nuclear processes influence astrophysical
phenomena is driving experimental and theoretical research programs worldwide.
One of the main goals in nuclear astrophysics is to understand how energy is
generated in stars, how elements are synthesized in stellar events and what the
nature of neutron stars is. New experimental capabilities, the availability of
radioactive beams and increased computational power paired with new
astronomical observations have advanced the present knowledge. This review
summarizes the progress in the field of nuclear astrophysics with a focus on
the role of indirect methods and reactions involving beams of rare isotopes.Comment: 121 pages, 27 figures, 510 references, to appear in Physics Reports.
Minor typos and references fixe
The chiral symplectic universality class
Full text linkWe report a numerical investigation of localization in the SU(2) model
without diagonal disorder. At the band center, chiral symmetry plays an
important role. Our results indicate that states at the band center are
critical. States away from the band center but not too close to the edge of the
spectrum are metallic as expected for Hamiltonians with symplectic symmetry.Comment: accepted in Proceedings of Localisation 2002 Conference, Tokyo, Japan
(to be published as supplement of J. Phys. Soc. Japan
Quenching of spectroscopic factors for proton removal in oxygen isotopes
Full text linkWe present microscopic coupled-cluster calculations of the spectroscopic
factors for proton removal from the closed-shell oxygen isotopes
O with the chiral nucleon-nucleon interaction at
next-to-next-to-next-to-leading order. We include coupling-to-continuum degrees
of freedom by using a Hartree-Fock basis built from a Woods-Saxon
single-particle basis. This basis treats bound and continuum states on an equal
footing. We find a significant quenching of spectroscopic factors in the
neutron-rich oxygen isotopes, pointing to enhanced many-body correlations
induced by strong coupling to the scattering continuum above the neutron
emission thresholds.Comment: 3 figure
Challenges for implementing the sustainable development goals in the Danish construction industry: Building owners' perspective
Get PDFThe construction sector holds great potential and responsibility in achieving the United Nation's 17 Sustainable Development Goals (SDGs). The aim of this study is to investigate how the SDGs can be implemented in construction projects in a Danish context, and which challenges building owners face working with the SDGs. A focus group workshop was held with 22 professional building owners to investigate which challenges they encounter and what is needed to support successful implementation, along with a survey focusing on their current implementation of the SDGs. The results showed that the five SDGs with the highest prioritization among the building owners were Goal 7 (affordable and clean energy), Goal 11 (sustainable cities and communities), Goal 13 (climate action), Goal 8 (decent work and economic growth), and Goal 12 (responsible consumption and production). 94% of the building owners had implemented, or wished to implement, the SDGs in various degrees. The main challenges experienced by the building owners were a lack of local indicators, tools and methods to support the implementation of the SDGs in construction, knowledge regarding the SDGs among the building owners, and extra costs related to the implementation of the SDGs. The main solutions suggested to overcome the challenges were the development of new tools and methods supporting the practical application of the SDGs in construction, e.g., dialogue tools for goal setting and prioritisation and for measuring performance regarding the SDG in construction, along with practical examples and knowledge aimed towards the actors within the construction industry. This study provides valuable insights of the challenges experienced by professional building owners regarding the implementation of the SDGs, as a point of departure for future research and developing practical solutions to support the implementation of the SDGs
Exponents of the localization lengths in the bipartite Anderson model with off-diagonal disorder
Full text linkWe investigate the scaling properties of the two-dimensional (2D) Anderson
model of localization with purely off-diagonal disorder (random hopping). In
particular, we show that for small energies the infinite-size localization
lengths as computed from transfer-matrix methods together with finite-size
scaling diverge with a power-law behavior. The corresponding exponents seem to
depend on the strength and the type of disorder chosen.Comment: 6 pages, 8 EPS-figures, requires phbauth.cl
Microscopic approach to large-amplitude deformation dynamics with local QRPA inertial masses
Full text linkWe have developed a new method for determining microscopically the
fivedimensional quadrupole collective Hamiltonian, on the basis of the
adiabatic self-consistent collective coordinate method. This method consists of
the constrained Hartree-Fock-Bogoliubov (HFB) equation and the local QRPA
(LQRPA) equations, which are an extension of the usual QRPA (quasiparticle
random phase approximation) to non-HFB-equilibrium points, on top of the CHFB
states. One of the advantages of our method is that the inertial functions
calculated with this method contain the contributions of the time-odd
components of the mean field, which are ignored in the widely-used cranking
formula. We illustrate usefulness of our method by applying to oblate-prolate
shape coexistence in 72Kr and shape phase transition in neutron-rich Cr
isotopes around N=40.Comment: 6pages, talk given at Rutherford Centennial Conference on Nuclear
Physics, 8 - 12 August 2011, The University of Mancheste
The acoustics of public square/places: a comparison between results from a computer simulation program and measurements in situ
Get PDFhttp://www.odeon.dk/pdf/InterNoise2004.pd
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