Parity nonconservation in nuclear fission: does it depend on fragment mass/energy?

Kötzle, A.; Jesinger, P.; Gönnenwein, F.; Петров, Г. А.; Petrova, V. I.; Gagarski, A. M.; Danilyan, G.V.; Zimmer, O.; Nesvizhevsky, V. V.

doi:10.1016/s0168-9002(99)01076-1

Cited by 28 publications

(9 citation statements)

References 2 publications

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“…Another related effect is the enhancement of the asymmetry of fission products with respect to the neutron spin direction in fission of heavy nuclei induced by slow polarized neutrons; here there is no kinematic factor but the chaotic mechanism again produces the enhancement of the order √ N ∼ 10 3 − 10 4 . As follows from the experiment, the asymmetry is the same in numerous decay channels which differ in the mass distribution of fragments and kinetic energy distribution [103]. This independence confirms that the enhancement is generated in the compound nucleus, prior to the choice of a certain decay channel by a fissioning nucleus.…”

Section: Beyond the Standard Modelsupporting

confidence: 72%

Quantum chaos and thermalization in isolated systems of interacting particles

et al. 2016

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This review is devoted to the problem of thermalization in a small isolated conglomerate of interacting constituents. A variety of physically important systems of intensive current interest belong to this category: complex atoms, molecules (including biological molecules), nuclei, small devices of condensed matter and quantum optics on nano-and micro-scale, cold atoms in optical lattices, ion traps. Physical implementations of quantum computers, where there are many interacting qubits, also fall into this group. Statistical regularities come into play through inter-particle interactions, which have two fundamental components: mean field, that along with external conditions, forms the regular component of the dynamics, and residual interactions responsible for the complex structure of the actual stationary states. At sufficiently high level density, the stationary states become exceedingly complicated superpositions of simple quasiparticle excitations. At this stage, regularities typical of quantum chaos emerge and bring in signatures of thermalization. We describe all the stages and the results of the processes leading to thermalization, using analytical and massive numerical examples for realistic atomic, nuclear, and spin systems, as well as for models with random parameters. The structure of stationary states, strength functions of simple configurations, and concepts of entropy and temperature in application to isolated mesoscopic systems are discussed in detail. We conclude with a schematic discussion of the time evolution of such systems to equilibrium.

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Section: Beyond the Standard Modelsupporting

confidence: 72%

Quantum chaos and thermalization in isolated systems of interacting particles

et al. 2016

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“…The kinematic enhancement factor is absent but the new element is that, after the weak interaction has mixed compound levels of opposite parity, the pear-shaped nucleus with parity doublets (an analog of -doubling in molecules [26]) proceeds through few specific fission channels which preserve memory of parity non-conservation. The later Grenoble experiments [27] confirmed this scenario showing that the mixing occurred in a 'hot' nucleus between chaotic wave functions, and therefore the resulting asymmetry is practically independent of the mass and kinetic energy distributions determined at the next stages of the process.…”

Section: Introductionmentioning

confidence: 79%

“…This mixes electron orbitals of opposite parity and generates the EDM of the atom. The results of detailed atomic calculations [48] can be presented as the proportionality between the atomic EDM d and the Schiff moment S, equation (27),…”

Section: From Nuclear Schiff Moment To Atomic Edmmentioning

confidence: 99%

“…Rare accidental proximity of the orbitals of opposite parity can lead [34] to the small energy denominators in (27). However, for single-particle mixing, this can hardly enhance the outcome since the matrix elements of W , equation (30), are roughly proportional to those of the single-particle momentum operator, and therefore to the energy differences of the mixed orbitals [42].…”

Section: Single-particle Schiff Momentmentioning

confidence: 99%

“…Here we do not introduce any body-fixed frame so the angular momentum must be strictly conserved in those mixing processes. Thus, in our main equation (27), we can have in the odd nucleus states of both parities with the same I, M quantum numbers like…”

Section: Rpa Approachmentioning

confidence: 99%

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Nuclear structure and the search for collective enhancement of {\cal P\hbox{,}T} -violating Schiff moments

Auerbach

Zelevinsky

2008

J. Phys. G: Nucl. Part. Phys.

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The search for the manifestations of new physics beyond the standard model in atomic and nuclear phenomena is pursued by several experimental groups. The discovery of the atomic electric dipole moment (EDM) would reveal the simultaneous violation of parity (P) and time-reversal (T ) invariance. The EDM can be induced by T -odd forces between the nucleus and atomic electrons. As the nuclear dipole moment is screened according to the Schiff theorem, the appropriate nuclear operator is the Schiff moment that may exist in nuclei under PT -violation. We briefly review the current experimental situation and discuss more in detail the ideas concerning possible collective mechanisms for the enhancement of the nuclear Schiff moment. The most promising directions are related to the coexistence of octupole and quadrupole collective modes, either in the form of static deformation or as soft vibrational excitations. The search for enhancement is important for widening the pool of nuclei as candidates for the atomic EDM as well as for development of nuclear many-body theory beyond standard mean-field and random phase approximations.

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Nuclear Fission

2017

Physics of Atomic Nuclei

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Parity nonconservation in nuclear fission: does it depend on fragment mass/energy?

Cited by 28 publications

References 2 publications

Quantum chaos and thermalization in isolated systems of interacting particles

Quantum chaos and thermalization in isolated systems of interacting particles

Nuclear structure and the search for collective enhancement of {\cal P\hbox{,}T} -violating Schiff moments

Nuclear Fission

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