44 research outputs found
Pairing effects in low density domain of nuclear matter
Using equations, governing np pairing correlations in S=1, T=0 pairing
channel (PRC 63 (2001) 021304(R)), it is shown that at low densities equations
for the energy gap in the spectrum of quasiparticles and chemical potentials of
protons and neutrons allow solutions with negative chemical potential. This
corresponds to appearance of Bose--Einstein condensate (BEC) of deuterons in
low density region of nuclear matter.Comment: 4 pages, 3 figure
A Survey of the Harvesting Histories of Some Poorly Regenerated Aspen Stands in Northern Minnesota
Transition from BCS pairing to Bose-Einstein condensation in low-density asymmetric nuclear matter
We study the isospin-singlet neutron-proton pairing in bulk nuclear matter as
a function of density and isospin asymmetry within the BCS formalism. In the
high-density, weak-coupling regime the neutron-proton paired state is strongly
suppressed by a minor neutron excess. As the system is diluted, the BCS state
with large, overlapping Cooper pairs evolves smoothly into a Bose-Einstein
condensate of tightly bound neutron-proton pairs (deuterons). In the resulting
low-density system a neutron excess is ineffective in quenching the pair
correlations because of the large spatial separation of the deuterons and
neutrons. As a result, the Bose-Einstein condensation of deuterons is weakly
affected by an additional gas of free neutrons even at very large asymmetries.Comment: 17 pages, uncluding 7 figures, PRC in pres
Densidade colimétrica das áreas de extrativismo de ostras em relação aos fatores ambientais em Cananeia (SP)
Geographical and temporal distribution of SARS-CoV-2 clades in the WHO European Region, January to June 2020
We show the distribution of SARS-CoV-2 genetic clades over time and between countries and outline potential genomic surveillance objectives. We applied three available genomic nomenclature systems for SARS-CoV-2 to all sequence data from the WHO European Region available during the COVID-19 pandemic until 10 July 2020. We highlight the importance of real-time sequencing and data dissemination in a pandemic situation. We provide a comparison of the nomenclatures and lay a foundation for future European genomic surveillance of SARS-CoV-2.Peer reviewe
Glyphosate and 2,4-D Application Over Red Pine Seedlings with Hand-Held Equipment
Published as Miscellaneous Journal Paper Series No. 1785 of the Minnesota Agricultural Experiment Station
Successful Establishment of Red Pine Tubelings in Minnesota
Published as Scientific Journal Paper Series No. 1648 of the Minnesota Agricultural Experiment Station