168 research outputs found
Overview of the LISA mission and R&D developments at the APC
International audienceThe study of the gravitational waves opens a new window for the observation of the universe. Completing the observations obtained from electro-magnetic waves, neutrinos and cosmic rays, the gravitational waves will provide informations on the most violent phenomena in the universe, as supernova explosions, collisions of binary systems or mergers of black holes. Their study will thus increase our knowledge in astrophysics, but also in cosmology and fundamental physics. This paper will make a short presentation of the future space interferometer LISA, aiming at detecting gravitational waves, and presents an overview of the R&D developments for LISA at the APC laboratory
LISA ON TABLE: AN OPTICAL SIMULATOR FOR LISA
LISA, the first space project for detecting gravitational waves, relies on two main technical challenges: the free falling masses and an outstanding precision on phase shift measurements (a few pm on 5 Mkm in the LISA band). The technology of the free falling masses, i.e. their isolation to forces other than gravity and the capability for the spacecraft to precisely follow the test masses, will soon be tested with the technological LISA Pathfinder mission. The performance of the phase measurement will be achieved by at least two stabilization stages: a pre-stabilisation of the laser frequency at a level of 10-13 (relative frequency stability) will be further improved by using numerical algorithms, such as Time Delay Interferometry, which have been theoretically and numerically demonstrated to reach the required performance level (10-21). Nevertheless, these algorithms, though already tested with numerical model of LISA, require experimental validation, including 'realistic' hardware elements. Such an experiment would allow to evaluate the expected noise level and the possible interactions between subsystems. To this end, the APC is currently developing an optical benchtop experiment, called LISA On Table (LOT), which is representative of the three LISA spacecraft. A first module of the LOT experiment has been mounted and is being characterized. After completion this facility may be used by the LISA community to test hardware (photodiodes, phasemeters) or software (reconstruction algorithms) components
The Glauber model and the heavy ion reaction cross section
We reexamine the Glauber model and calculate the total reaction cross section
as a function of energy in the low and intermediate energy range, where many of
the corrections in the model, are effective.
The most significant effect in this energy range is by the modification of
the trajectory due to the Coulomb field. The modification in the trajectory due
to nuclear field is also taken into account in a self consistent way.
The energy ranges in which particular corrections are effective, are
quantified and it is found that when the center of mass energy of the system
becomes 30 times the Coulomb barrier, none of the trajectory modification to
the Glauber model is really required.
The reaction cross sections for light and heavy systems, right from near
coulomb barrier to intermediate energies have been calculated. The exact
nuclear densities and free nucleon-nucleon (NN) cross sections have been used
in the calculations. The center of mass correction which is important for light
systems, has also been taken into account.
There is an excellent agreement between the calculations with the modified
Glauber model and the experimental data. This suggests that the heavy ion
reactions in this energy range can be explained by the Glauber model in terms
of free NN cross sections without incorporating any medium modification.Comment: RevTeX, 21 pages including 9 Postscript figures, submitted to Phys.
Rev.
Folding model analysis of elastic and inelastic proton scattering on Sulfur isotopes
The folding formalism for the nucleon-nucleus optical potential and inelastic
form factor is applied to study elastic and inelastic proton scattering on
30-40S isotopes. A recently developed realistic density dependent M3Y
interaction, well tested in the folding analysis of nucleus-nucleus elastic and
inelastic scattering, is used as effective NN interaction. The nuclear ground
state and transition densities (for the 2+ excitations in Sulfur isotopes) are
obtained in the Hartree-Fock-BCS and QRPA approaches, respectively. The best
fit ratios of transition moments Mn/Mp for the lowest 2+ states in Sulfur
isotopes are compared to those obtained earlier in the DWBA analysis of the
same data using the same structure model and inelastic form factors obtained
with the JLM effective interaction. Our folding+DWBA analysis has shown quite a
strong isovector mixing in the elastic and inelastic scattering channels for
the neutron rich 38,40S nuclei. In particular, the relative strength of the
isovector part of the transition potential required by the inelastic p+38S data
is significantly stronger than that obtained with the corresponding QRPA
transition density.Comment: 24 pages, 11 figures, accepted for publication in Nucl. Phys.
First escaping fast ion mesurements in ITER-like geometry using an activation probe
More research is needed to develop suitable diagnostics for measuring alpha particle confinement in ITER and techniques relevant for fusion reactor conditions need further development. Based on nuclear reactions, the activation probe is a novel concept first tested in JET. It may offer a more robust solution for performing alpha particle measurements in ITER. This paper describes the first escaping fast ion measurements performed at ASDEX Upgrade (AUG) tokamak using an activation probe. A detailed analysis, outside the scope of this contribution, will be published in a journal paper.JRC.D.4-Standards for Nuclear Safety, Security and Safeguard
Probing the 6He halo structure with elastic and inelastic proton scattering
Proton elastic scattering and inelastic scattering to the first excited state
of 6He have been measured over a wide angular range using a 40.9A MeV 6He beam.
The data have been analyzed with a fully microscopic model of proton-nucleus
scattering using 6He wave functions generated from large space shell model
calculations. The inelastic scattering data show a remarkable sensitivity to
the halo structure of 6He.Comment: 9 pages, 3 figures. RevTeX. Replaced figure 3 with updated figur
Single-neutron transfer from 11Be gs via the (p,d) reaction with a radioactive beam
The 11Be(p,d)10Be reaction has been performed in inverse kinematics with a
radioactive 11Be beam of E/A = 35.3 MeV. Angular distributions for the 0+
ground state, the 2+, 3.37 MeV state and the multiplet of states around 6 MeV
in 10Be were measured at angles up to 16 deg CM by detecting the 10Be in a
dispersion-matched spectrometer and the coincident deuterons in a silicon
array. Distorted wave and coupled-channels calculations have been performed to
investigate the amount of 2+ core excitation in 11Be gs. The use of "realistic"
11Be wave functions is emphasised and bound state form factors have been
obtained by solving the particle-vibration coupling equations. This calculation
gives a dominant 2s component in the 11Be gs wave function with a 16% [2+ x 1d]
core excitation admixture. Cross sections calculated with these form factors
are in good agreement with the present data. The Separation Energy prescription
for the bound state wave function also gives satisfactory fits to the data, but
leads to a significantly larger [2 x 1d] component in 11Be gs.Comment: 39 pages, 12 figures. Accepted for publication in Nuclear Physics A.
Added minor corrections made in proof to pages 26 and 3
The calculation of total reaction cross sections induced by intermediate energy -particles with BUU Model
The Boltzmann-Uehling-Uhlenbeck (BUU) Model, which includes the Fermi motion,
the mean field, individual nucleon-nucleon (N-N) interactions and the Pauli
blocking effect etc., is used to calculate the total reaction cross section
induced by -particles on different targets in the incident
energy range from 17.4 to 48.1 MeV/u. The calculation result can reproduce the
experimental data well. The nucleus-nucleus interaction radius parameter
was extracted from experimental . It is found that becomes
constant with increasing the mass number of target.Comment: 4 pages, 4 fig
Etude electroanalytique de complexes de la meso-tetrakis (4-N-methyl pyridyl) porphine en solution et sur zeolite : applications catalytiques
SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc
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