54968955
Nuclear Physics for the Re/Os Clock
Dating the age of the universe by the β-decay of 187Re (t1/2 = 41.2 Gyr) 
requires the accurate assessment of the s-process reaction flow. The daughter 
nucleus 187Os as well as its immediate s-only neighbor 186Os are shielded from 
the r-process. Therefore, the radiogenic contribution to 187Os can be derived 
via the local approximation of the s-process, which is well justified in this 
mass region: ( σ Ns)187 = ( σ Ns)186. Accordingly, accurate Maxwellianaveraged 
(n, γ ) cross sections have to be known for 186Os and 187Os over the 
full range of s-process temperatures. Because 187Os has low-lying excited 
states, which are significantly populated during the s-process, neutron captures 
on these excited states have to be properly taken into account. The input 
for the corresponding Hauser–Feshbach calculations can be constrained by 
deriving the strength functions from a detailed resonance analysis of the 
measured (n, γ ) cross sections as well as by an additional measurement of 
the inelastic scattering cross section for the first exited level, which dominates 
the competition between the capture and scattering channels. This contribution 
reports on measurements of the neutron capture cross sections of 186Os, 187Os 
and 188Os from the eV region to 1MeV at the CERN/n TOF facility and of the 
inelastic scattering cross section of 187Os around 30 keV at the Karlsruhe 
3.7 MV Van de Graaff accelerator. Based on these results and on a 
detailed resonance analysis, improved Maxwellian-averaged cross sections 
were obtained for thermal energies between 5 keV and 100 keV. The 
implications of these results for the Re/Os clock are discussed.
118535533
New description of the doublet bands in doubly odd nuclei
The experimentally observed {delta}I=1 doublet bands in some odd-odd nuclei are analyzed within the orthosymplectic extension of the interacting vector boson model (IVBM). A new, purely collective interpretation of these bands is given on the basis of the obtained boson-fermion dynamical symmetry of the model. It is illustrated by its application to three odd-odd nuclei from the A{approx}130 region, namely {sup 126}Pr, {sup 134}Pr, and {sup 132}La. The theoretical predictions for the energy levels of the doublet bands as well as E2 and M1 transition probabilities between the states of the yrast band in the last two nuclei are compared with experiment and the results of other theoretical approaches. The obtained results reveal the applicability of the orthosymplectic extension of the IVBM.
120041897
Level densities of transitional Sm nuclei
Experimentally determined level densities of the transitional isotopes $^{148,149,150,152}\mathrm{Sm}$ at excitation energies below and around the neutron binding energy are compared with microcanonical calculations based on a Monte Carlo approach to noncollective level densities, folded with a collective enhancement estimated in the frame of the interacting boson model (IBM). The IBM parameters are adjusted so as to reproduce the low-lying discrete levels of both parities, with the exception of the odd-mass nucleus, $^{149}\mathrm{Sm}$, where complete decoupling of the unpaired neutron from the core is assumed.
2076925
PT symmetry breaking and explicit expressions for the pseudo-norm in the Scarf II potential
Closed expressions are derived for the pseudo-norm, norm and orthogonality relations for arbitrary bound states of the PT symmetric and the Hermitian Scarf II potential for the first time. The pseudo-norm is found to have indefinite sign in general. Some aspects of the spontaneous breakdown of PT symmetry are analyzed.
1115406
Spin formalism in the algebraic scattering theory for heavy ions.
We develop a simple method of treating spin effects in the frame of algebraic scattering theory and apply it to the system {sup 16}O+{sup 65}Cu at {ital E}{sub c.m.}=44.77 MeV.
33472567
Measurement of the Sm-151(n, gamma) cross section from 0.6-eV to 1-MeV via the neutron time-of-flight technique at the CERN n_TOF facility
The {sup 151}Sm(n,{gamma}) cross section was measured with the time-of-flight technique from 0.6 eV up to 1 MeV relative to the Au standard with an overall uncertainty of typically 6%. Neutrons were produced by spallation at the innovative n{sub T}OF facility at CERN; the {gamma} rays from capture events were detected with organic C{sub 6}D{sub 6} scintillators. Experimental setup and data analysis procedures are described with emphasis on the corrections for detection efficiency, background subtraction, and neutron flux determination. At low energies, resonances could be resolved up to about 1 keV, yielding a resonance integral of 3575{+-}210 b, an average s-wave resonance spacing of =1.49{+-}0.07 eV, and a neutron strength function of =(3.87{+-}0.33)x10{sup -4}. Maxwellian-averaged capture cross sections are reported for thermal energies between 5 and 100 keV. These results are of relevance for nuclear structure studies, nuclear astrophysics, and nuclear technology. The new value of the Maxwellian-averaged cross section at kT=30 keV is 3.08{+-}0.15 b, considerably larger than previous theoretical estimates, and provides better constraints for the thermodynamic conditions during the occurrence of the slow neutron capture process in low-mass stars during their asymptotic giant branch phase.
123468882
Prospects for SUSY discovery based on inclusive searches with the ATLAS detector
The search for Supersymmetry (SUSY) among the possible scenarios of new physics is one of the most relevant goals of the ATLAS experiment running at CERN's Large Hadron Collider. In the present work the expected prospects for discovering SUSY with the ATLAS detector are reviewed, in particular for the first fb-1 of collected integrated luminosity. All studies and results reported here are based on inclusive search analyses realized with Monte Carlo signal and background data simulated through the ATLAS apparatus.
17810666
ATLAS RPC Cosmic Ray Teststand at INFN Lecce
We describe the design and functionality of the cosmic ray teststand built at 
INFN Lecce for ATLAS RPC quality control assurance.
51843235
The ATLAS Data Acquisition and Trigger: concept, design and status
This article presents the base-line design and implementation of the ATLAS Trigger and Data Acquisition system, in particular the Data Flow and High Level Trigger components. The status of the installation and commissioning of the system is also presented.
124822108
MUON RECONSTRUCTION AND IDENTIFICATION FOR THE EVENT FILTER OF THE ATLAS EXPERIMENT
6222401
Implementation and performance of the seeded reconstruction for the ATLAS event filter
ATLAS is one of the four major Large Hadron Collider (LHC) experiments that will start data taking in 2007. It is designed to cover a wide range of physics topics. The ATLAS trigger system has to be able to reduce an initial 40 MHz event rate, corresponding to an average of 23 proton-proton inelastic interactions per every 25 ns bunch crossing, to 200 Hz admissible by the Data Acquisition System. The ATLAS trigger is divided in three different levels. The first one provides a signal describing an event signature using dedicated custom hardware. This signature must be confirmed by the High Level Trigger (HLT) which using commercial computing farms performs an event reconstruction by running a sequence of algorithms. The validity of a signature is checked after every algorithm execution. A main characteristic of the ATLAS HLT is that only the data in a certain window around the position flagged by the first level trigger are analyzed. In this work, the performance of one sequence that runs at the Event Filter level (third level) is demonstrated. The goal of this sequence is to reconstruct and identify high transverse momentum electrons by performing cluster reconstruction at the electromagnetic calorimeter, track reconstruction at the Inner Detector, and cluster track matching.