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Search Results: 1 - 10 of 195622 matches for " Nicholas D. Scielzo "
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Cosmogenic-neutron activation of TeO2 and implications for neutrinoless double-beta decay experiments
Barbara S. Wang,Eric B. Norman,Nicholas D. Scielzo,Alan R. Smith,Keenan J. Thomas,Stephen A. Wender
Physics , 2015, DOI: 10.1103/PhysRevC.92.024620
Abstract: Flux-averaged cross sections for cosmogenic-neutron activation of natural tellurium were measured using a neutron beam containing neutrons of kinetic energies up to $\sim$800 MeV, and having an energy spectrum similar to that of cosmic-ray neutrons at sea-level. Analysis of the radioisotopes produced reveals that 110mAg will be a dominant contributor to the cosmogenic-activation background in experiments searching for neutrinoless double-beta decay of 130Te, such as CUORE and SNO+. An estimate of the cosmogenic-activation background in the CUORE experiment has been obtained using the results of this measurement and cross-section measurements of proton activation of tellurium. Additionally, the measured cross sections in this work are also compared with results from semi-empirical cross-section calculations.
Neutron capture cross sections from Surrogate measurements
Escher J.E.,Dietrich F.S.,Scielzo N.D.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100206001
Abstract: The prospects for determining cross sections for compound-nuclear neutron-capture reactions from Surrogate measurements are investigated. Calculations as well as experimental results are presented that test the Weisskopf-Ewing approximation, which is employed in most analyses of Surrogate data. It is concluded that, in general, one has to go beyond this approximation in order to obtain (n,γ) cross sections of sufficient accuracy for most astrophysical and nuclear-energy applications.
Production of high purity TeO2 single crystals for the study of neutrinoless double beta decay
C. Arnaboldi,C. Brofferio,A. Bryant,C. Bucci,L. Canonica,S. Capelli,M. Carrettoni,M. Clemenza,I. Dafinei,S. Di Domizio,F. Ferroni,E. Fiorini,Z. Ge,A. Giachero,L. Gironi,A. Giuliani,P. Gorla,E. Guardincerri,R. Kadel,K. Kazkaz,L. Kogler,Y. Kolomensky,J. Larsen,M. Laubenstein,Y. Li,C. Maiano,M. Martinez,R. Maruyama,S. Nisi,C. Nones,Eric B. Norman,A. Nucciotti,F. Orio,L. Pattavina,M. Pavan,G. Pessina,S. Pirro,E. Previtali,C. Rusconi,Nicholas D. Scielzo,M. Sisti,Alan R. Smith,W. Tian,M. Vignati,H. Wang,Y. Zhu
Physics , 2010, DOI: 10.1016/j.jcrysgro.2010.06.034
Abstract: High purity TeO2 crystals are produced to be used for the search for the neutrinoless double beta decay of 130Te. Dedicated production lines for raw material synthesis, crystal growth and surface processing were built compliant with radio-purity constraints specific to rare event physics experiments. High sensitivity measurements of radio-isotope concentrations in raw materials, reactants, consumables, ancillaries and intermediary products used for TeO2 crystals production are reported. Production and certification protocols are presented and resulting ready-to-use TeO2 crystals are described.
New Formulation of Paraquat: A Step Forward but in the Wrong Direction?
D. Nicholas Bateman
PLOS Medicine , 2008, DOI: 10.1371/journal.pmed.0050058
Abstract:
Foundation Myth as legal formant: The medieval Law Merchant and the new Lex Mercatoria
Nicholas H. D. Foster
Forum Historiae Iuris , 2005,
Abstract:
The Sun Dance and the Gustafsen Lake Standoff: Healing Through Resistance and the Danger of Dismissing Religion
Nicholas D. Shrubsole
International Indigenous Policy Journal , 2011,
Abstract: The revitalization and renewal of traditional indigenous spiritual practices have produced new forms of indigenous religiosity rooted in experience, contact and combination. This paper examines the contemporary Sun Dance, a traditional healing ritual that seeks to address pain and sickness in indigenous communities through religious practice. For some Sun Dancers in both the United States and Canada who seek freedom for indigenous peoples through radical political activism, the Sun Dance has provided courage, validity anddeeper meaning in their endeavours. However, when a highly politicized form of the ritual emerged in the non-traditional region of the British Columbia interior at Gustafsen Lake, it led the media, the state, and local elected First Nations leadership to dismiss the ritual as fraudulent. As demonstrated below, a failure to protect sacred sites and ceremonies and to understand the embodied spiritualities that accompany them can lead to violence between religious communities and the state.
On the structure of phase transition maps for three or more coexisting phases
Nicholas D. Alikakos
Mathematics , 2013,
Abstract: This paper is partly based on a lecture delivered by the author at the ERC workshop "Geometric Partial Differential Equations" held in Pisa in September 2012. What is presented here is an expanded version of that lecture.
Some basic facts on the system Δu - W_u (u) = 0
Nicholas D. Alikakos
Mathematics , 2009, DOI: 10.1090/S0002-9939-2010-10453-7
Abstract: We rewrite the system \Delta u - W_u (u) = 0, for u: R^n to R^n, in the form div T = 0, where T is an appropriate stress-energy tensor, and derive certain a priori consequences on the solutions. In particular, we point out some differences between two paradigms: the phase-transition system, with target a finite set of points, and the Ginzburg-Landau system, with target a connected manifold.
A new proof for the existence of an equivariant entire solution connecting the minima of the potential for the system Δu - W_u (u) = 0
Nicholas D. Alikakos
Mathematics , 2011,
Abstract: Recently, Giorgio Fusco and the author studied the system {\Delta}u - W_u (u) = 0 for a class of potentials that possess several global minima and are invariant under a general finite reflection group, and established existence of equivariant solutions connecting the minima in certain directions at infinity, together with an estimate. In this paper a new proof is given which, in particular, avoids the introduction of a pointwise constraint in the minimization process.
Laser-trapping of Ra-225 and Ra-226 with repumping by room temperature blackbody radiation
J. R. Guest,N. D. Scielzo,I. Ahmad,K. Bailey,J. P. Greene,R. J. Holt,Z. -T. Lu,T. P. O'Connor,D. H. Potterveld
Physics , 2007, DOI: 10.1103/PhysRevLett.98.093001
Abstract: We have demonstrated Zeeman slowing and capture of neutral Ra-225 and Ra-226 atoms in a magneto-optical trap (MOT). The intercombination transition 1S0-3P1 is the only quasi-cycling transition in radium and was used for laser-cooling and trapping. Repumping along the 3D1-1P1 transition extended the lifetime of the trap from milliseconds to seconds. Room-temperature blackbody radiation was demonstrated to provide repumping from the metastable 3P0 level. We measured the isotope shift and hyperfine splittings on the 3D1-1P1 transition with the laser-cooled atoms, and set a limit on the lifetime of the 3D1 level based on the measured blackbody repumping rate. Laser-cooled and trapped radium is an attractive system for studying fundamental symmetries.
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