3,364 research outputs found
Efeito do tamanho de gotas de iscas tóxicas na mortalidade de adultos da mosca-das-frutas sul-americana.
Neste trabalho foi avaliado o efeito do tamanho de gotas de uma isca tóxica formulada com o atrativo alimentar ANAMED® e o inseticida Malathion 1000 EC (0,2% v/v) na mortalidade de adultos de A. fraterculus em laboratório
Calculations of three-body observables in ^8B breakup
We discuss calculations of three-body observables for the breakup of ^8B on a
^{58}Ni target at low energy using the coupled discretised continuum channels
approach. Calculations of both the angular distribution of the ^7Be fragments
and their energy distributions are compared with those measured at several
laboratory angles. In these observables there is interference between the
breakup amplitudes from different spin-parity excitations of the projectile.
The resulting angle and the energy distributions reveal the importance of the
higher-order continuum state couplings for an understanding of the
measurements.Comment: 22 pages (postscript), accepted in Phys. Rev.
Direct reaction measurements with a 132Sn radioactive ion beam
The (d,p) neutron transfer and (d,d) elastic scattering reactions were
measured in inverse kinematics using a radioactive ion beam of 132Sn at 630
MeV. The elastic scattering data were taken in a region where Rutherford
scattering dominated the reaction, and nuclear effects account for less than 8%
of the cross section. The magnitude of the nuclear effects was found to be
independent of the optical potential used, allowing the transfer data to be
normalized in a reliable manner. The neutron-transfer reaction populated a
previously unmeasured state at 1363 keV, which is most likely the
single-particle 3p1/2 state expected above the N=82 shell closure. The data
were analyzed using finite range adiabatic wave calculations and the results
compared with the previous analysis using the distorted wave Born
approximation. Angular distributions for the ground and first excited states
are consistent with the previous tentative spin and parity assignments.
Spectroscopic factors extracted from the differential cross sections are
similar to those found for the one neutron states beyond the benchmark
doubly-magic nucleus 208Pb.Comment: 22 pages, 7 figure
Experimental study of the nature of the 1− and 2− excited state
The nature of the 1− and 2− excited states in 10Be is studied using the 11Be(p, d) transfer reaction in
inverse kinematics at 10A MeV at TRIUMF ISAC-II, in particular to assess whether either of them can be
considered as an excited halo state. The angular distributions for both states are extracted using deuteron-γ
coincidences and analyzed using a transfer model taking into account one-step and two-step processes. A good
fit of the angular distributions is obtained considering only the one-step process, whereby an inner p3/2 neutron
of 11Be is removed, leaving the halo neutron intact. Higher-order processes however cannot be rejected. The
small spectroscopic factors extracted suggest that the structure of both states is not uniquely halo-like, but
rather display a more complex configuration mixing cluster and halo structures. Further insights are limited, as
this experiment specifically probed the halo-like (but not cluster-like) 11Be(1/2+) ⊗ (ν p3/2 )
−1 configuration in
both states.U.S. Department of Energy (DOE): DE-FG03-93ER40789 (Colorado School of Mines), DE-FG02-96ER40978 (Louisiana State), DE-SC0021422 (Michigan State), DE-AC05-00OR22725 (Oak Ridge National Laboratory)The National Nuclear Security Administration a través de los acuerdos de cooperación del DOE de EE. UU.(NNSA) DE-FG52-08NA28552The National Science Foundation PHY-1811815 (Michigan State)Ministerio español de Ciencia e Innovación y fondos FEDER. RTI2018-098117-B-C21 y PGC2018-096994-BC21Agencia Española de Investigación (AEI). PID2019-104714GB-C2
Levantamento da ocorrência do moko da bananeira em Rondônia.
O presente trabalho visa apresentar dados sobre o levantamento da ocorrência do moko nos diferentes municípios do Estado de Rondônia, tendo como base as coletas de amostras de bananais, realizado pela Agência de Defesa Agrossilvopastoril de Rondônia ? Idaron, em parceria com a Embrapa Rondônia, entre os anos de 2004 e 2007.bitstream/CPAF-RO-2009-09/12208/1/cot323_mokodabananeira.pdfAngela M. L. Nunes, Embrapa Rondônia (In memorian)
Impurity-induced diffusion bias in epitaxial growth
We introduce two models for the action of impurities in epitaxial growth. In
the first, the interaction between the diffusing adatoms and the impurities is
``barrier''-like and, in the second, it is ``trap''-like. For the barrier
model, we find a symmetry breaking effect that leads to an overall down-hill
current. As expected, such a current produces Edwards-Wilkinson scaling. For
the trap model, no symmetry breaking occurs and the scaling behavior appears to
be of the conserved-KPZ type.Comment: 5 pages(with the 5 figures), latex, revtex3.0, epsf, rotate, multico
Low-lying level structure of Cu and its implications on the rp process
The low-lying energy levels of proton-rich Cu have been extracted
using in-beam -ray spectroscopy with the state-of-the-art -ray
tracking array GRETINA in conjunction with the S800 spectrograph at the
National Superconducting Cyclotron Laboratory at Michigan State University.
Excited states in Cu serve as resonances in the
Ni(p,)Cu reaction, which is a part of the rp-process in
type I x-ray bursts. To resolve existing ambiguities in the reaction Q-value, a
more localized IMME mass fit is used resulting in ~keV. We derive
the first experimentally-constrained thermonuclear reaction rate for
Ni(p,)Cu. We find that, with this new rate, the
rp-process may bypass the Ni waiting point via the Ni(p,)
reaction for typical x-ray burst conditions with a branching of up to
40. We also identify additional nuclear physics uncertainties that
need to be addressed before drawing final conclusions about the rp-process
reaction flow in the Ni region.Comment: 8 pages, accepted for Phys. Rev.
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