MeV X Rays and Photoneutrons from Femtosecond Laser-Produced Plasmas

Schwoerer, H.; Gibbon, Paul; Düsterer, S.; Behrens, R.; Ziener, C.; Reich, Ch.; Sauerbrey, R.

doi:10.1103/physrevlett.86.2317

Cited by 179 publications

(94 citation statements)

References 34 publications

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“…at BD9, formed five bubbles during the laser shots. Schwoerer et al [16] have also demonstrated ( , n) reaction using 250 mJ laser pulses with pulse duration 60 fs.…”

Section: Epj Web Of Conferencesmentioning

confidence: 99%

Observation of neutrons in the interaction of high intensity laser pulses with solid targets

Tayyab

Chakera

Naik

et al. 2013

EPJ Web of Conferences

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Abstract.We report an experimental study on fusion neutron generation from deuterated polyethylene (CD 2 ) n target irradiated by 400 mJ, 45 femtosecond laser pulses focused to an intensity >10 18 W/cm 2 . The fusion neutron signal has been detected using a CR-39 detector, a bubble detector, and also confirmed by a neutron time of flight detector. In addition, substantial bremsstrahlung X-ray radiation of MeV energy was also observed. These MeV X-rays have been used to trigger ( , n) reaction in Be and Cu targets and the resulting photo-neutrons were detected on a BF 3 and a bubble detector.

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“…at BD9, formed five bubbles during the laser shots. Schwoerer et al [16] have also demonstrated ( , n) reaction using 250 mJ laser pulses with pulse duration 60 fs.…”

Section: Epj Web Of Conferencesmentioning

confidence: 99%

Observation of neutrons in the interaction of high intensity laser pulses with solid targets

Tayyab

Chakera

Naik

et al. 2013

EPJ Web of Conferences

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“…The hot electron distribution was inferred by using parametrized one-and two-temperature test distributions to fit the measured channel responses. 20,21 Here we have used a genetic algorithm to determine the electron distribution underlying the measured response in the detector channels as produced by the emitted bremsstrahlung spectrum. The electron spectrum is sampled by a set of 17 discrete electron energies E j ranging from 20 keV to 10 MeV.…”

Section: A Hot Electron Spectramentioning

confidence: 99%

The role of hot electron refluxing in laser-generated K-alpha sources

Neumayer¹,

Aurand²,

Basko³

et al. 2010

Physics of Plasmas

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A study of the contribution of refluxing electrons in the production of K-alpha radiation from high-intensity laser irradiated thin targets has been performed. Thin copper foils both freestanding, and backed by a thick substrate were irradiated with laser pulses of energies around 100 J at intensities ranging from below 1017 to above 1019 W/cm2. At high laser intensities we find a strong reduction in the K-alpha yield from targets backed by the substrate. The observed yield reduction is in good agreement with a simple model using hot electron spectra from particle-in-cell simulations or directly inferred from the measured bremsstrahlung emission and can therefore be interpreted as due to the suppression of hot electron refluxing. The study shows that refluxing electrons play a dominant role in high-intensity laser driven K- alpha generation and have to be taken into account in designing targets for laser driven high-flux K-alpha sources.

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“…[1,2]. Emission of gamma-photons from a Ta target exposed in vacuum to peak intensity of 10 18 W/cm 2 in a femtosecond range of pulse duration results has been reported recently [3]. The average energy of these photons is about few MeV.…”

Section: Introductionmentioning

confidence: 99%

Initiation of nuclear reactions under laser irradiation of Au nanoparticles in the aqueous solution of Uranium salt

Simakin

Shafeev

2010

Appl. Phys. A

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Laser exposure of suspension of either gold or palladium nanoparticles in aqueous solutions of UO 2 Cl 2 of natural isotope abundance was experimentally studied. Picosecond Nd:YAG lasers at peak power of 10 11 -10 13 W/cm 2 at the wavelength of 1.06 -0.355 m were used as well as a visible-range Cu vapor laser at peak power of 10 10 W/cm 2 . The composition of colloidal solutions before and after laser exposure was analyzed using atomic absorption and gamma spectroscopy in 0.06 -1 MeV range of photon energy. A real-time gamma-spectroscopy was used to characterize the kinetics of nuclear reactions during laser exposure. It was found that laser exposure initiated nuclear reactions involving both 238 U and 235 U nuclei via different channels in H 2 O and D 2 O. The influence of saturation of both the liquid and nanoparticles by gaseous H 2 and D 2 on the kinetics of nuclear transformations was found. Possible mechanisms of observed processes are discussed.

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MeV X Rays and Photoneutrons from Femtosecond Laser-Produced Plasmas

Cited by 179 publications

References 34 publications

Observation of neutrons in the interaction of high intensity laser pulses with solid targets

Observation of neutrons in the interaction of high intensity laser pulses with solid targets

The role of hot electron refluxing in laser-generated K-alpha sources

Initiation of nuclear reactions under laser irradiation of Au nanoparticles in the aqueous solution of Uranium salt

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