TTB(v) and TTB(a) at completion of both steps had the greatest classification accuracy of all stability measures (80.8%).
Trunk flexion velocity at completion of the first recovery step and trunk flexion angle at completion of the second step had the greatest overall classification of all measures (92.3%). Thirteen subjects fell from an initial disturbance, but recovered from a second, identical disturbance. Fourteen young adults stood on a treadmill that delivered surface accelerations necessitating multiple forward compensatory steps. Kinematic measures included trunk flexion angle and angular velocity, step length, and the time after disturbance onset of recovery step completion. The stability measures included the anteroposterior distance (d) between the body center of mass and the stepping limb toe, the margin of stability (MOS), as well as time-to-boundary considering velocity (TTB(v)), velocity and acceleration (TTB(a)), and MOS (TTB(MOS)). In addition, the shared variance between stability measures, step kinematics, and trunk kinematics is reported. This study evaluated the discriminant capability of stability measures, trunk kinematics, and step kinematics to classify successful and failed compensatory stepping responses. The discriminant capabilities of stability measures, trunk kinematics, and step kinematics in classifying successful and failed compensatory stepping responses by young adults.Ĭrenshaw, Jeremy R Rosenblatt, Noah J Hurt, Christopher P Grabiner, Mark D Furthermore, the dependence of the proton–proton scattering kinematics on the internal momentum of the struck proton and on its separation energy was investigated for the first time in inverse kinematics employing a large-acceptance measurement.« less The obtained results are in a good agreement with this theory and with direct- kinematics experiments. Cross sections and momentum distributions were extracted and compared to theoretical calculations employing the eikonal formalism. Particle-unstable deep-hole states, corresponding to proton removal from the 0s-orbital, were studied via the invariant-mass technique. Exclusive (p, 2p)cross sections of 15.8(18)mb,more » 1.9(2)mb and 1.5(2)mb to the low-lying 0p-hole states overlapping with the ground state (3/2 –) and with the bound excited states of 11B at 2.125MeV (1/2 –) and 5.02MeV (3/2 –), respectively, were determined via γ-ray spectroscopy. Both valence and deeply-bound nucleon orbits are probed, including those leading to unbound states of the daughter nucleus. The outgoing pair of protons and the fragments were measured simultaneously, enabling an unambiguous identification of the reaction channels and a redundant measurement of the kinematic observables. This new technique has been developed to study the single-particle structure of exotic nuclei in experiments with radioactive-ion beams. Quasi-free scattering reactions of the type (p, 2p)were measured for the first time exclusively in com-plete and inverse kinematics, using a 12C beam at an energy of ~400MeV/uas a benchmark.
The present results do not show any sizable dependence of the nuclear dissipation parameter on temperature or deformation.Įxclusive measurements of quasi-free proton scattering reactions in inverse and complete kinematics These data are compared with different model calculations to extract information on the value of the dissipation parameter at small and large deformations. This measurement permitted us to accurately determine fission cross sections, the charge distribution, and the neutron excess of the fission fragments as a function of the atomic number of the fissioning system.
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A new generation experimental setup allowed for the first full and unambiguous identification in mass and atomic number of both fission fragments. Fissioning systems with high excitation energies, compact shapes, and low angular momenta were produced in inverse kinematics by using spallation reactions of lead projectiles. Voss, B.Ī complete kinematics measurement of the two fission fragments was used for the first time to investigate fission dynamics at small and large deformations. Presaddle and postsaddle dissipative effects in fission using complete kinematics measurements
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