15 research outputs found
A method to measure the resonance transitions between the gravitationally bound quantum states of neutrons in the GRANIT spectrometer
We present a method to measure the resonance transitions between the
gravitationally bound quantum states of neutrons in the GRANIT spectrometer.
The purpose of GRANIT is to improve the accuracy of measurement of the quantum
states parameters by several orders of magnitude, taking advantage of long
storage of Ultracold neutrons at specula trajectories. The transitions could be
excited using a periodic spatial variation of a magnetic field gradient. If the
frequency of such a perturbation (in the frame of a moving neutron) coincides
with a resonance frequency defined by the energy difference of two quantum
states, the transition probability will sharply increase. The GRANIT experiment
is motivated by searches for short-range interactions (in particular
spin-dependent interactions), by studying the interaction of a quantum system
with a gravitational field, by searches for extensions of the Standard model,
by the unique possibility to check the equivalence principle for an object in a
quantum state and by studying various quantum optics phenomena
Investigation of the prompt neutron emission mechanism in low energy fission of 235,233U(nth, f) and 252Cf(sf)
A series of experiments has been performed to measure prompt neutron angular and energy distributions from thermal neutron-induced fission of 235,233U in correlation with the fission fragments. These distributions have been analyzed with the assumption of neutron isotropic emission from accelerated fission fragments. The performed analysis demonstrates that all obtained results can be described within 5% accuracy using this assumption. This discrepancy is approximately constant and doesn’t depend on fragment mass and the total kinetic energy (TKE). Some minor peculiarities of angular distribution may be interpreted as a result of anisotropy of the fission neutron angular distribution in the fragment center-of-mass system
Investigation of the prompt neutron emission mechanism in low energy fission of
A series of experiments has been performed to measure prompt neutron angular and energy distributions from thermal neutron-induced fission of 235,233U in correlation with the fission fragments. These distributions have been analyzed with the assumption of neutron isotropic emission from accelerated fission fragments. The performed analysis demonstrates that all obtained results can be described within 5% accuracy using this assumption. This discrepancy is approximately constant and doesn’t depend on fragment mass and the total kinetic energy (TKE). Some minor peculiarities of angular distribution may be interpreted as a result of anisotropy of the fission neutron angular distribution in the fragment center-of-mass system
Angular distributions and anisotropy of fission fragments from neutron-induced fission of 239Pu, 237Np, and natPb in energy range 1–200 MeV
This work summarizes some results of a series of experiments aimed at the investigation of energy dependence of anisotropy of fission fragments (FFs) in (n, f) reactions for neutron energies from low to intermediate. Angular distributions of FFs from the neutron-induced fission of 239Pu, 237Np, and natPb have been measured in the energy range 1–200 MeV at the neutron TOF spectrometer GNEIS based on the spallation neutron source at 1 GeV proton synchrocyclotron of the Petersburg Nuclear Physics Institute (Gatchina, Russia). The anisotropies of FFs deduced from the measured angular distributions are presented. In the neutron energy range above 20 MeV the results have been obtained for the first time in our works. The experimental data for FF anisotropy in 237Np(n, f) are compared with calculations based on "adapted" TALYS software
Angular distributions and anisotropy of fission fragments from neutron-induced fission of
This work summarizes some results of a series of experiments aimed at the investigation of energy dependence of anisotropy of fission fragments (FFs) in (n, f) reactions for neutron energies from low to intermediate. Angular distributions of FFs from the neutron-induced fission of 239Pu, 237Np, and natPb have been measured in the energy range 1–200 MeV at the neutron TOF spectrometer GNEIS based on the spallation neutron source at 1 GeV proton synchrocyclotron of the Petersburg Nuclear Physics Institute (Gatchina, Russia). The anisotropies of FFs deduced from the measured angular distributions are presented. In the neutron energy range above 20 MeV the results have been obtained for the first time in our works. The experimental data for FF anisotropy in 237Np(n, f) are compared with calculations based on "adapted" TALYS software
Gravitationally bound quantum states of neutrons: applications and perspectives
Gravitationally bound quantum states of matter were observed recently due to unique properties of ultracold neutrons. We discuss here the actual status and possible improvements in this experiment. This phenomenon could be useful for various domains ranging from the physics of elementary particles and fields, to surface studies, or to foundations of quantum mechanics
Reply to Comment on Measurement of quantum states of neutrons in the Earth's gravitational field
New methodical developments for GRANIT. Nouveaux développements méthodologiques pour GRANIT
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