Communication in a conference opening

Nyman, Gary W.

doi:10.1080/01463377609369221

Cited by 3 publications

(3 citation statements)

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“…the role of the 0S1/2--+0p3/2 VS. the Opa/z~lsl/z particle-hole transition could be tested. Finally, there has been a slight turmoil for a while with respect to the particular structure of the 1/2 + level in 9Be when beta-delayed neutron spectra of 9Li revealed peculiar fine structure peaks [15] which, however, have been shown in the meantime [15] to have their origin not in the nuclear structure of 9Be.…”

Section: Introductionmentioning

confidence: 93%

Line shape and excitation strength of the first excited state in9Be

Kuechler

Richter

Witsch

1987

Z. Physik A - Atomic Nuclei

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Dedicated to Professor Theo Mayer-Kuckuk on the occasion of his 60th birthdayThe line shape and the excitation strength of the very weak first excited J~= 1/2 + state at Ex= 1.684 MeV in 9Be has been investigated with high-resolution inelastic electron scattering at Eo=45 and 49 MeV and scattering angles 0=105% 117 ~ 129 ~ and 165% and with high-resolution inelastic proton scattering at E0=13 MeV and 0=15 ~ and 18 ~ Due to lying just above the neutron threshold the level has a strongly asymmetric line shape which in both experiments can be described consistently with a Breit-Wigner expression modified on the low energy side by the threshold behaviour of the cross section. The resonance energy is ER = 1.684_+ 0.007 MeV and the width F = 217 __ 10 keV in the c.m. system. A single particle potential model calculation reproduces the line shape and the resonance parameters fairly well. In addition, the inelastic electron scattering form factor has been measured. In the range of momentum transfers q = 0.24-0.46 fm-1 it is dominated by a 0P3/2 --" 1 $1/2 particle-hole transition. The transition is mainly longitudinal and of isoscalar nature with a strength of B(E1)T =0.027 _+0.002 e 2 fm 2, but a small M2 contribution of B(M2)T = 8.8_+ 1.5 #~ fm z has also been detected.

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Section: Introductionmentioning

confidence: 93%

Line shape and excitation strength of the first excited state in9Be

Kuechler

Richter

Witsch

1987

Z. Physik A - Atomic Nuclei

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“…The observation of Bose-Einstein condensation of photons has lead to many subsequent theoretical discussions and experimental extensions , based in part on the simplicity of the material system. Here we focus on an aspect that has only recently been cursorily studied [28,29], the dynamics of polarization.…”

Section: Introductionmentioning

confidence: 99%

Polarization dynamics in a photon Bose-Einstein condensate

2017

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It has previously been shown that a dye-filled microcavity can produce a Bose-Einstein condensate of photons. Thermalization of photons is possible via repeated absorption and re-emission by the dye molecules. In this paper, we theoretically explore the behavior of the polarization of light in this system. We find that in contrast to the near complete thermalization between different spatial modes of light, thermalization of polarization states is expected to generally be incomplete. We show that the polarization degree changes significantly from below to above threshold, and explain the dependence of polarization on all relevant material parameters.

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“…The experiment performed in [7] can be seen as a proof of principle in this respect. The second method is an indirect measurement via the eigenfrequencies of the cavity [48]. In case of small interaction, which is the case in the photon BEC, the dipole mode corresponds to the difference of the lowest two cavity eigenfrequencies.…”

Section: Summary and Experimental Perspectivementioning

confidence: 99%

Collective modes of a photon Bose–Einstein condensate with thermo-optic interaction

2019

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Although for photon Bose-Einstein condensates the main mechanism of the observed photonphoton interaction has already been identified to be of a thermo-optic nature, its influence on the condensate dynamics is still unknown. Here a mean-field description of this effect is derived, which consists of an open-dissipative Schrödinger equation for the condensate wave function coupled to a diffusion equation for the temperature of the dye solution. With this system at hand, the lowest-lying collective modes of a harmonically trapped photon Bose-Einstein condensate are calculated analytically via a linear stability analysis. As a result, the collective frequencies and, thus, the strength of the effective photon-photon interaction turn out to strongly depend on the thermal diffusion in the cavity mirrors. In particular, a breakdown of the Kohn theorem is predicted, i.e.the frequency of the centre-of-mass oscillation is reduced due to the thermo-optic photon-photon interaction.

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Communication in a conference opening

Cited by 3 publications

References 1 publication

Line shape and excitation strength of the first excited state in9Be

Line shape and excitation strength of the first excited state in9Be

Polarization dynamics in a photon Bose-Einstein condensate

Collective modes of a photon Bose–Einstein condensate with thermo-optic interaction

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