Spinning charged test particles in a Kerr-Newman background

Hojman, R.; Hojman, Sergio A.

doi:10.1103/physrevd.15.2724

Cited by 96 publications

(132 citation statements)

References 7 publications

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“…A 2 mg/cm 2 self-supporting 208 Pb target was bombarded with a 10 nA 18 O beam. The spectroscopy of nuclei in this mass region is hampered by the very small incomplete fusion cross sections [7] (in the reactions used, of only a few tens of µb) and the intense background originated from fission. To reduce this intense γ background, we used the ISIS array (40 telescopic E-E particle detectors) to trigger the GASP spectrometer, selecting the α particles emitted in coincidence with transitions between excited states in 216 Rn.…”

Section: Methodsmentioning

confidence: 99%

High-spin octupole yrast levels inRn21686

Debray

Davidson

et al. 2006

Phys. Rev. C

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The yrast level structure of 216 Rn has been studied using in-beam spectroscopy α-γ -γ coincidence techniques through the 208 Pb( 18 O, 2α2n) reaction in the 91-93 MeV energy range, using the 8π GASP-ISIS spectrometer at Legnaro. The level scheme of 216 Rn resulting from this study shows alternating parity bands only above a certain excitation energy. From this result, the lightest nucleus showing evidence of octupole collectivity at low spins is still 216 Fr, thereby defining the lowest-mass corner for this kind of phenomenon as N 129 and Z 87.

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Section: Methodsmentioning

confidence: 99%

High-spin octupole yrast levels inRn21686

Debray

Davidson

et al. 2006

Phys. Rev. C

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“…In the paper by Tod, de Felice & Calvani [18] the influence of test body's spin on the radii of ISCO for different values of Kerr parameter a including naked singularities was numerically calculated, see also papers of Abramowicz & Calvani [19] and Calvani [20]. More general case of Kerr-Newman metric was analysed by Hojman & Hojman [21]. Subsequently the number of works on this subject were published .…”

Section: Introductionmentioning

confidence: 99%

Innermost stable circular orbits of spinning test particles in Schwarzschild and Kerr space-times

2015

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We consider the motion of classical spinning test particles in Schwarzschild and Kerr metrics and investigate innermost stable circular orbits (ISCO). The main goal of this work is to find analytically the small-spin corrections for the parameters of ISCO (radius, total angular momentum, energy, orbital angular frequency) of spinning test particles in the case of vectors of black hole spin, particle spin and orbital angular momentum being collinear to each other. We analytically derive the smallspin linear corrections for arbitrary Kerr parameter a. The cases of Schwarzschild, slowly rotating and extreme Kerr black hole are considered in details. For a slowly rotating black hole the ISCO parameters are obtained up to quadratic in a and particle's spin s terms. From the formulae obtained it is seen that the spin-orbital coupling has attractive character when spin and angular momentum are parallel and repulsive when they are antiparallel. For the case of the extreme Kerr black hole with co-rotating particle we succeed to find the exact analytical solution for the limiting ISCO parameters for arbitrary spin. It has been shown that the limiting values of ISCO radius and frequency do not depend on the particle's spin while values of energy and total angular momentum depend on it. We have also considered circular orbits of arbitrary radius and have found small-spin linear corrections for the total angular momentum and energy at given radius. System of equations for numerical calculation of ISCO parameters for arbitrary a and s is also explicitly written.

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“…For simplicity, we only consider the orbits in the equatorial plane with θ = π 2 , for which the non-vanishing components of the conjugate momentum are [24] …”

Section: Spinning Particles In Charged Spinning Black Hole Backgmentioning

confidence: 99%

“…III we obtain the four momentum of a spinning test particle based on Ref. [24] and calculate the CM energy for two spinning test particles in the KN background. In Sec.…”

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confidence: 99%

Charged spinning black holes as accelerators of spinning particles

Zhang

Wei

et al. 2016

Phys. Rev. D

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It is well known that some black holes can act as accelerators for particles without spin. Recently, there are some works considering collision of two spinning particles in the background of Schwarzschild and Kerr black holes and it was shown that the center-of-mass energy of the test particles is related to the spin. In this paper we extend the results to some more general cases. We consider Kerr-Newman black holes as accelerators for spinning particles. We derive the center-ofmass energy of the spinning particles and use numerical method to investigate how the center-of-mass energy is affected by the properties of the black holes and spinning particles.

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Spinning charged test particles in a Kerr-Newman background

Cited by 96 publications

References 7 publications

High-spin octupole yrast levels inRn21686

High-spin octupole yrast levels inRn21686

Innermost stable circular orbits of spinning test particles in Schwarzschild and Kerr space-times

Charged spinning black holes as accelerators of spinning particles

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