Photonuclear reactions induced by intense short laser pulses

Dietz, Barbara; Weidenmüller, Hans A.

doi:10.1016/j.physletb.2010.07.061

Cited by 8 publications

(13 citation statements)

References 22 publications

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“…In view of the overall good agreement of the SBW model with experimental, exact analytical and RMT results we may conclude that it provides a good description for the variances of the cross-sections. (36) and (39) and of (24) and (25) in Ref. [31].…”

Section: Variances Of the Cross-sectionsmentioning

confidence: 98%

“…The analytical results (black full lines) were obtained by computing the inverse Fourier transform ofC ab (τ ) in Eqs. (36) and (39). For this we evaluated the integrals (43)- (46) and used Eqs.…”

Section: Cross-section Autocorrelation Functionsmentioning

confidence: 99%

“…The bumps appearing in the experimental curves for 3 − 5 are attributed 49) and (50), respectively, for 52 equal transmission coefficients. Black squares were obtained using the inverse Fourier transforms of (36) and (39) and of (24) and (25) in Ref. [31], red circles and the blue line show the RMT simulations and the exact analytical results given in Ref.…”

Section: Cross-section Autocorrelation Functionsmentioning

confidence: 99%

“…shows for τ = 0 the fractions of the contributions of the functions entering(36) and(39) to the crosssection correlation functionC ab (τ ) versus Γ W /d. These results are qualitatively characteristic of the relative sizes of the corresponding terms for τ = 0.…”

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confidence: 99%

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Cross-section fluctuations in chaotic scattering systems

2016

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Exact analytical expressions for the cross-section correlation functions of chaotic scattering systems have hitherto been derived only under special conditions. The objective of the present article is to provide expressions that are applicable beyond these restrictions. The derivation is based on a statistical model of Breit-Wigner type for chaotic scattering amplitudes which has been shown to describe the exact analytical results for the scattering (S)-matrix correlation functions accurately. Our results are given in the energy and in the time representations and apply in the whole range from isolated to overlapping resonances. The S-matrix contributions to the cross-section correlations are obtained in terms of explicit irreducible and reducible correlation functions. Consequently, the model can be used for a detailed exploration of the key features of the cross-section correlations and the underlying physical mechanisms. In the region of isolated resonances, the cross-section correlations contain a dominant contribution from the self-correlation term. For narrow states the self-correlations originate predominantly from widely spaced states with exceptionally large partial width. In the asymptotic region of well-overlapping resonances, the cross-section autocorrelation functions are given in terms of the S-matrix autocorrelation functions. For inelastic correlations, in particular, the Ericson fluctuations rapidly dominate in that region. Agreement with known analytical and experimental results is excellent.

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Section: Variances Of the Cross-sectionsmentioning

confidence: 98%

Section: Cross-section Autocorrelation Functionsmentioning

confidence: 99%

Section: Cross-section Autocorrelation Functionsmentioning

confidence: 99%

mentioning

confidence: 99%

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Cross-section fluctuations in chaotic scattering systems

2016

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“…Ways of detecting such collective nuclear excitation experimentally are discussed in Ref. [12]. Double photon absorption is dominantly due to the Brink-Axel mechanism (as opposed to double excitation of the dipole mode).…”

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confidence: 99%

Nuclear Excitation by a Zeptosecond Multi-MeV Laser Pulse

Weidenmüller

2011

Phys. Rev. Lett.

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A zeptosecond multi-MeV laser pulse may either excite a "plasma" of strongly interacting nucleons or a collective mode. We derive the conditions on laser energy and photon number such that either of these scenarios is realized. We use the nuclear Giant Dipole Resonance as a representative example, and a random-matrix description of the fine-structure states and perturbation theory as tools. PACS numbers: 42.50Ct, 24.30Cz, 24.60Dr Purpose. Qualitative Considerations. With the start of the construction of ELI (the "extreme light infrastructure") [1] or with extant ultra-intense laser facilites like NIF (if reconfigured as femtosecond pulse systems) [2,3] nuclear spectroscopy using intense high-energy laser beams with short pulses has become a realistic possibility. Indeed, it is envisaged to generate in the decade ahead pulsed laser light with photon energies of several MeV and pulse lengths of 10 −19 seconds by coherent Thomson backscattering [4][5][6]. This will be possible provided that present intense experimental and theoretical efforts will validate the concept of an electron mirror [6]. These very exciting developments call for a theoretical exploration of the expected nuclear excitation processes. In the framework of the nuclear shell model (a mean-field approach with a residual nucleon-nucleon interaction), two scenarioss come to mind, distinguished by time scales. (i) The time scale for the residual interaction is large compared to the time scale for laser excitation of individual nucleons. Then a single laser pulse containing N ≫ 1 photons excites many nucleons more or less simultaneously. The resulting "plasma" of excited and interacting nucleons (distantly similar to the initial stage of a precompound reaction) is instable. Nucleons excited above particle threshold with low angular momenta are emitted instantaneously. The remainder of the system is equilibrated by the residual interaction. Exciting questions are: What are the mean mass number, the mean excitation energy and the mean angular momentum of the resulting compound nucleus? How big are the spreads of these quantities? Presumably it will be possible to study compound nuclei at excitation energies and spin values not accessible so far. (ii) The time scale for the residual interaction is sufficiently short compared to the time between two successive photon absorption processes. Then the nucleus relaxes after each photon absorption process. Single photon absorption leads to a collective mode (typically the Giant Dipole Mode), and multiple photon absorption within the same laser pulse may lead to the formation of higher harmonics of that mode. Thus, scenarios (i) and (ii) lead to extremely different forms of nuclear excitation.In this Letter we establish the time scales and the resulting conditions on the mean photon energy E L and the number N of photons relevant for scenarios (i) and (ii). We do so by studying scenario (ii) in detail. We show that scenarios (i) and (ii) both occur for realistic choices of E L and N . We also show that scena...

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Developing a diagnostic for energetic laser-Compton produced photon beams

Quiter

Zhang

Barton

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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This paper describes the design and simulation of a radiation detector system for diagnostic measurements of photon beams produced by Thomson or Compton Scattering. The photon beam is Compton scattered in a thin passive converter, and the resulting electrons are analyzed using a charge-coupled device-based tracker and classification algorithms. The flux of the scattered electrons is much lower than that of the photon beam and is additionally dispersed. This dispersal enables measurements while avoiding pileup, which is important in order to provide diagnostic information from intense 'shot' based pulsed systems, such as those being built to leverage laser wakefield accelerators. Simulations indicate that the designed system is capable of resolving beam parameters from a single shot. The fidelity to which various beam parameters can be resolved is presented as are methods that could result in further improvement to diagnostic resolution.

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Photonuclear reactions induced by intense short laser pulses

Cited by 8 publications

References 22 publications

Cross-section fluctuations in chaotic scattering systems

Cross-section fluctuations in chaotic scattering systems

Nuclear Excitation by a Zeptosecond Multi-MeV Laser Pulse

Developing a diagnostic for energetic laser-Compton produced photon beams

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