Abstract:The lecture presents an overview of the quest for the new physics in low energy neutron phenomena. In addition to the traditional topics the quantum damping of nn oscillations is discussed.
“…In different models the imaginary part of the optical potential differs by almost an order of magnitude [20]. An attempt has been undertaken recently [21] to develop a model forn 12 6 C interaction. Carbon is a material which served as a target in the ILL experiment [5] and will be used in the ESS project [7].…”
Section: Reflection From the Wall: Optical Modelmentioning
confidence: 99%
“…The idea that it might be possible to minimize the randomization through a suitable choice of the wall material, trap size, or reflection angle was put forward long ago [8,9]. Since then the problem was at the focus of several publications [10][11][12] but despite some progress it is still pending. In the present work we try to analyse collisions with the wall from different angles.…”
We examine what role do collisions with the wall play in neutron-antineutron transitions. The collision time for n andn and the phase difference between reflected n andn waves are calculated. It is shown that transitions inside the wall are negligible.
“…In different models the imaginary part of the optical potential differs by almost an order of magnitude [20]. An attempt has been undertaken recently [21] to develop a model forn 12 6 C interaction. Carbon is a material which served as a target in the ILL experiment [5] and will be used in the ESS project [7].…”
Section: Reflection From the Wall: Optical Modelmentioning
confidence: 99%
“…The idea that it might be possible to minimize the randomization through a suitable choice of the wall material, trap size, or reflection angle was put forward long ago [8,9]. Since then the problem was at the focus of several publications [10][11][12] but despite some progress it is still pending. In the present work we try to analyse collisions with the wall from different angles.…”
We examine what role do collisions with the wall play in neutron-antineutron transitions. The collision time for n andn and the phase difference between reflected n andn waves are calculated. It is shown that transitions inside the wall are negligible.
“…The process of n −n oscillations for UCN (ultracold neutrons) trapped in a storage vessel has been studied in a number of papers, e.g., [29][30][31][32][33][34][35][36]. Here we want to look at this process from a new angle.…”
Section: Decoherence Due To Collisions With the Trap Wallsmentioning
confidence: 99%
“…Note that in [12] the Hamiltonian contains 2π k nvf i (0)(i = 1, 2) without Lindblad terms in the evolution equation. The representation (35) allows to write the equation in the Lindblad form. Both parametrizations lead to the same physical results.…”
Section: Lindblad Equation For the Bloch Vectormentioning
confidence: 99%
“…Both parametrizations lead to the same physical results. The terms 2π k nvRef i (0), (i = 1, 2) in (35) correspond to the energy shift related to forward scattering, i.e., the real part of the index of refraction. The Lindblad operator is defined as…”
Section: Lindblad Equation For the Bloch Vectormentioning
We propose a new approach based on the Lindblad and Bloch equations for the density matrix to the problem of a neutron into an antineutron conversion. We consider three strategies to search for conversion: experiments with trapped neutrons, oscillations in nuclei, and quasi-free propagation. We draw a distinction between nn oscillations in which the probability that a neutron transforms into an antineutron depends on time according to the sine-square law and the non-oscillatory overdamped nn conversion. We show that in all three cases decoherence due to the interaction with the environment leads to non-oscillatory evolution.
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