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Ram P. Sharma,Johannes Breidenbach 한국산림과학회 2015 Forest Science And Technology Vol.11 No.1
We developed nonlinear mixed effects height-diameter models for three major tree species: Norway spruce (Picea abies[L.] Karst.); Scots pine (Pinus sylvestris L.); and downy birch (Betula pubescens [Ehrh.]) in Norway. We used data fromfour Norwegian national forest inventory (NFI) cycles (7th10th NFI cycle) as model fitting data and data from the 6thNFI cycle as validation data. Among several bi-parametric functions tested as base functions in a preliminary analysis, theN€aslund function showed the smallest residual variations, and therefore it was extended by incorporating stand variables ascovariates that act as modifiers of the original parameters of the N€aslund function. Sample plot-level random effects werealso included in order to account for inter-plot variations within the populations. Unlike a basic mixed effects model, theextended mixed model described larger parts of variations in the height-diameter relationships and predicted heightswithout significant bias for validation data from the sample plots, where all measured heights of the focused species(species used for species-specific model) were used to predict random effects. For species independent models, whenmeasured heights of other than focused species were used to predict random effects, a significant height prediction biasoccurred. This bias could be reduced for certain diameter ranges by applying an extended ordinary least square model. Werecommend using extended mixed effects models to estimate the missing heights on NFI sample plots and other sampleplots, where measured tree heights of the focused species are available for prediction of random effects. When measuredheights are not available, the extended ordinary least square model can be used.
First search for Lorentz andCPTviolation in double beta decay with EXO-200
Albert, J. B.,Barbeau, P. S.,Beck, D.,Belov, V.,Breidenbach, M.,Brunner, T.,Burenkov, A.,Cao, G. F.,Chambers, C.,Cleveland, B.,Coon, M.,Craycraft, A.,Daniels, T.,Danilov, M.,Daugherty, S. J.,Davis, C. American Physical Society 2016 Physical Review D Vol.93 No.7
<P>A search for Lorentz- and CPT-violating signals in the double beta decay spectrum of Xe-136 has been performed using an exposure of 100 kg . yr with the EXO-200 detector. No significant evidence of the spectral modification due to isotropic Lorentz -violation was found, and a two-sided limit of -2.65 x 10(-5) GeV < (a)(of),(,3r) < 7.60 x 10(-6) GeV (90% C.L.) is placed on the relevant coefficient within the Standard -Model Extension (SME). This is the first experimental study of the effect of the SME-defined oscillation -free and momentum-independent neutrino coupling operator on the double beta decay process.</P>
Search for2νββdecay ofXe136to the01+excited state ofBa136with the EXO-200 liquid xenon detector
Albert, J. B.,Auty, D. J.,Barbeau, P. S.,Beck, D.,Belov, V.,Breidenbach, M.,Brunner, T.,Burenkov, A.,Cao, G. F.,Chambers, C.,Chaves, J.,Cleveland, B.,Coon, M.,Craycraft, A.,Daniels, T.,Danilov, M.,Dau American Physical Society 2016 Physical Review C Vol.93 No.3
<P>EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless pp decay of Xe-136 to the ground state of Ba-136. We report here on a search for the two -neutrino pp decay of Xe-136 to the first 0+ excited state, 0(1)(+), of Ba-136 based on a 100 kg yr exposure of Xe-136. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of 1.7 x 10(24) yr. We find no statistically significant evidence for the 20P decay to the excited state resulting in a lower limit of Ti-1/2(7 nu) (0(+) -> 0(1)(+)) > 6.9 x10(23) yr at 90% CL. This observed limit is consistent with the estimated half-life of 2.5 x 10(25) yr.</P>
Search for nucleon decays with EXO-200
Albert, J. B.,Anton, G.,Badhrees, I.,Barbeau, P. S.,Bayerlein, R.,Beck, D.,Belov, V.,Breidenbach, M.,Brunner, T.,Cao, G. F.,Cen, W. R.,Chambers, C.,Cleveland, B.,Coon, M.,Craycraft, A.,Cree, W.,Daniel American Physical Society 2018 Physical Review D Vol.97 No.7
Investigation of radioactivity-induced backgrounds in EXO-200
Albert, J. B.,Auty, D. J.,Barbeau, P. S.,Beck, D.,Belov, V.,Benitez-Medina, C.,Breidenbach, M.,Brunner, T.,Burenkov, A.,Cao, G. F.,Chambers, C.,Cleveland, B.,Coon, M.,Craycraft, A.,Daniels, T.,Danilov American Physical Society 2015 PHYSICAL REVIEW C - Vol.92 No.1
Search for Neutrinoless Double-Beta Decay with the Upgraded EXO-200 Detector
Albert, J. B.,Anton, G.,Badhrees, I.,Barbeau, P. S.,Bayerlein, R.,Beck, D.,Belov, V.,Breidenbach, M.,Brunner, T.,Cao, G. F.,Cen, W. R.,Chambers, C.,Cleveland, B.,Coon, M.,Craycraft, A.,Cree, W.,Daniel American Physical Society 2018 Physical Review Letters Vol.120 No.7