Spin correlation function of neutrons emitted by a compound nucleus with high angular momentum

Kun, S. Yu.; Gentner, R.; Lassen, L.

doi:10.1007/bf01294490

Cited by 4 publications

(5 citation statements)

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“…The first observation was done on photons in astronomical research and is a cornerstone in fundamental physics, known as Hanbury Brown-Twiss effect [1]. Since then, many experiments have been performed, both on bosonic and fermionic systems, such as electrons, pions and atoms [2][3][4][5][6][7][8][9].…”

mentioning

confidence: 99%

“…The experiment was a massiveparticle analogue of the seminal optical Hanbury-Brown and Twiss experiment on photon bunching [1], and its outcome proved the occurrence of antibunching on pairs of free fermions in the triplet spin state. Although other experiments evidenced antibunching on various fermionic systems, like electrons and atoms [2][3][4][5][7][8][9], a basic question remained controversial in relation to the free neutron experiment [16]. In order to observe antibunching in a coincidence experiment, a prerequisite is that the active surfaces of the two detectors, as viewed from the source, belong to the same transverse coherence area of the fermion beam and are shined by a reasonable number of particle pairs from such area.…”

mentioning

confidence: 99%

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Further evidence of antibunching of two coherent beams of fermions

Iannuzzi

Messi

Moricciani³

et al. 2011

Phys. Rev. A

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confidence: 99%

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confidence: 99%

Further evidence of antibunching of two coherent beams of fermions

Iannuzzi

Messi

Moricciani³

et al. 2011

Phys. Rev. A

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“…(1+P 2) in case of neutron emission with polarisation P [7]. Since in the present system P = 22% [29] would increase the lifetime by only 4%, we disregarded this correction.…”

Section: Discussionmentioning

confidence: 94%

“…The experimentally deduced lifetime has, in principle, to be corrected for a possible polarization correlation of the neutrons, predicted by statistical-model calculations [28,29]. The factor 1/2 in the coincidence cross section (1) holds for neutrons emitted unpolarized and has to be replaced by 1/2.…”

Section: Discussionmentioning

confidence: 99%

Intensity interferometry with neutrons from the compound nucleus82Kr

Gentner

Keller

Lücking

et al. 1992

Z. Physik A - Hadrons and Nuclei

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Abstract. Correlations between neutrons have been studied in the 96 MeV 1sO + 64Ni reaction, yielding the compound nucleus S2Kr at 88 MeV excitation energy. The observed anticorrelation at small relative momenta evidences dominance of quantum-statistical interference between identical particles, from which it is possible to deduce an average source lifetime r= (1.2 + 0,1) 9 10 -2o s as an upper limit disregarding possible contributions to the correlation function from the competing nn final-state interaction. Lacking appropriate model calculations at present, it is argued that further refinements in the theoretical treatment of strong interactions in the final state are needed to enable truly quantitative conclusions from small-angle nucleon-nucleon correlations at such large timescales.

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“…A typical example of such an idea is the deuteron desintegration by the reactions (Breunlich et al 1974). The proper shielding of both detectors and fast electronic gates are important requirements to avoid cross-talk effects and to get reliable results (Cronqvist et al 1992, Kun et al 1992, De Yong et al 1996. A possible anti-correlation has been observed for low relative and low total momentum pairs of neutrons.…”

Section: Dobrynin and Lomorosov 1989mentioning

confidence: 99%

Neutron Interferometry 2nd Edn

Rauch¹,

Werner²

2015

131

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In this new edition we have retained the overall structure of the original book. It now consists of 12 chapters. We have shifted some material from later chapters to the first chapter. In particular, we have described gravitationally induced quantum interference (COW experiment) and early experiments on spin rotation, spinors, and spin-related phases in Chapter 1. These results have gotten broad attention in recent years and are now described in various standard physics textbooks. This change in format was done with a view of the close connection of these experiments with the atom interferometry field and with the modern ideas on entanglement now permeating all of the modern quantum mechanical literature.Neutron interferometry is a mature technique in experimental physics. The use of the perfect silicon crystal interferometer to accurately measure scattering lengths of many isotopes is given in Chapter 3. Very accurate measurements of the neutron scattering lengths of the proton, deuteron, and He-3 have been carried out in recent years. These results confine the parameters in various theoretical models of few-body nuclear physics.Chapter 4 is retitled "Coherence and Decoherence," so as to include many new topics connected to the current emphasis in certain areas of physics related to how coherent quantum systems decohere and evolve into systems described by classical Lagrangian and Hamiltonian mechanics. The quantum concepts of entanglement, contexuality, squeezing, Wigner functions, interactions of quantum systems with the environment, post selection experiments, measures of distinguishability, intensity-intensity correlations, and Bell's inequalities are the general topics of this expanded chapter. "Contexuality and Kochen-Specker Phenomena" are discussed in a new Chapter 7.Our original Chapter 8 dealing with forthcoming and more speculative experiments is now Chapter 10. Some of those experiments have advanced considerably over the intervening 12 years since the publication of the 1st edition. Experiments related to searches for non-Newtonian gravity at short distances have been pursued in various confined geometries, such as transmission through narrow slits. Related ideas, called "bouncing ball" experiments, have successfully observed quantized states of ultra-cold neutrons in the Earth's gravity. An experiment designed to observe the Anandan acceleration has not yet been attempted. The observation of relativistic proper time effects, as suggested in Chapter 8, occurs at the level of 10 -9 . Suggested observation of such effects in atom beam interferometry, related to a gravitational redshift, has generated interesting, but controversial papers. Perhaps there is a way to pursue such effects with neutron interferometry utilizing the Pendellösung interference fringes, as discussed in this chapter on "Gravitational, Inertial, and Motional Effects." A feasible time-dependent Fizeau experiment is described to study new motional effects and for the cooling of neutron beams.Various new techniques and experiments of...

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Spin correlation function of neutrons emitted by a compound nucleus with high angular momentum

Cited by 4 publications

References 7 publications

Further evidence of antibunching of two coherent beams of fermions

Further evidence of antibunching of two coherent beams of fermions

Intensity interferometry with neutrons from the compound nucleus82Kr

Neutron Interferometry 2nd Edn

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