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Prompt neutron emission in ^(250)No spontaneous fission associated with ground and isomeric state decays

Chinese Physics C 2024年第6期48卷 112-117页

作者： R.S.Mukhin A.V.Isaev A.V.Andreev M.L.Chelnokov V.I.Chepigin H.M.Devaraja I.N.Izosimov A.A.Kuznetsova O.N.Malyshev A.G.Popeko Yu.A.Popov A.Rahmatinejad B.Sailaubekov T.M.Shneidman E.A.Sokol A.I.Svirikhin M.S.Tezekbayeva M.A.Bychkov A.V.Yeremin O.Dorvaux B.Gall K.Kessaci K.Hauschild a.lopez-martens Joint Institute for Nuclear Research Dubna141980Russia Dubna State University Dubna141982Russia Institute of Nuclear Physics Almaty050032Kazakhstan L.N.Gumilyov Eurasian National University Astana010008Kazakhstan Kazan Federal University Kazan420008Russia Universitéde Strasbourg CNRSStrasbourg67000France IJCLab IN2P3-CNRSUniversitéParis-SaclayOrsay91400France

The complete-fusion reaction^(204)Pb(^(48)Ca,2n)^(250)No was used to study two activities of^(250)No with distinct half-lives.A total of 1357 events were observed in the SFiNx neutron detection *** average number of neutrons emitted per spontaneous fission of^(250)No was determined to be(4.1±0.1).The unusually symmetrical shape of the prompt neutron multiplicity distribution was restored and presented for the first *** tests were performed to compare the prompt neutron multiplicity distributions associated with the ground state and K-isomer state decays.

关键词： spontaneous fission prompt neutrons actinide

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Relativistic-intensity near-single-cycle light waveforms at kHz repetition rate

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Light(Science & Applications) 2020年第1期9卷 1572-1580页

作者： Marie Ouille Aline Vernier Frederik Bohle Maimouna Bocoum Aurelie Jullien Magali Lozano Jean-Philippe Rousseau Zhao Cheng Dominykas Gustas Andreas Blumenstein Peter Simon Stefan Haessler Jerome Faure Tamas Nagy Rodrigo lopez-martens Laboratoire d’Optique Appliquee CNRSEcole PolytechniqueENSTA ParisInstitut Polytechnique de Paris181 chemin de la Huniere et des Joncherettes91120 PalaiseauFrance Ardop Engineering Cite de la Photonique11 Avenue de la Canterannebat.Pleione33600 PessacFrance Laser-Laboratorium Gottingen e.V. Hans-Adolf-Krebs-Weg 137077 GottingenGermany Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy Max-Born-Strasse 2A12489 BerlinGermany

The development of ultra-intense and ultra-short light sources is currently a subject of intense research driven by the discovery of novel phenomena in the realm of relativistic optics,such as the production of ultrafast energetic particle and radiation beams for *** has been a long-standing challenge to unite two hitherto distinct classes of light sources:those achieving relativistic intensity and those with pulse durations approaching a single light *** the former class traditionally involves large-scale amplification chains,the latter class places high demand on the spatiotemporal control of the electromagnetic laser ***,we present a light source producing waveformcontrolled 1.5-cycle pulses with a 719 nm central wavelength that can be focused to relativistic intensity at a 1 kHz repetition rate based on nonlinear post-compression in a long hollow-core *** unique capabilities of this source allow us to observe the first experimental indications of light waveform effects in laser wakefield acceleration of relativistic energy electrons.

关键词： repetition intensity light

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High-Harmonic Generation and Correlated Electron Emission from Relativistic Plasma Mirrors at 1 kHz Repetition Rate

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Ultrafast Science 2022年第3期2卷 19-27页

作者： Stefan Haessler Marie Ouillé Jaismeen Kaur Maïmouna Bocoum Frederik Böhle Dan Levy Louis Daniault Aline Vernier Jérôme Faure Rodrigo lopez-martens Laboratoire d’Optique Appliquée ENSTA ParisCNRSEcole PolytechniqueInstitut Polytechnique de Paris181 Chemin de la Hunière et des Joncherettes91120 PalaiseauFrance Ardop Engineering Citéde la Photonique11 Avenue de la CanteranneBât.Pléione33600 PessacFrance Department of Physics of Complex Systems Weizmann Institute of ScienceRehovot 7610001Israel

We report evidence for the first generation of XUV spectra from relativistic surface high-harmonic generation(SHHG)on plasma mirrors at a kilohertz repetition rate,emitted simultaneously with energetic *** spectra and electron angular distributions are measured as a function of the experimentally controlled plasma density gradient scale length Lg for three increasingly short and intense driving pulses:24 fs and a0=1:1,8 fs and a0=1:6,and finally 4 fs and a0≈2:1,where a0 is the peak vector potential normalized by mec/e with the elementary charge e,the electron rest mass me,and the vacuum light velocity *** all driver pulses,we observe correlated relativistic SHHG and electron emission in the range Lg∈½λ/20,λ/4,with an optimum gradient scale length of Lg≈λ/*** universal optimal Lg-range is rationalized by deriving a direct intensity-independent link between the scale length Lg and an effective similarity parameter for relativistic laser-plasma interactions.

关键词： Attosecond science and technology Attosecond light source High-harmonic generation

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