2006
DOI: 10.1140/epja/i2005-10277-9
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Constraints on the time scale of nuclear breakup from thermal hard-photon emission

Abstract: Measured hard photon multiplicities from second-chance nucleon-nucleon collisions are used in combination with a kinetic thermal model, to estimate the break-up times of excited nuclear systems produced in nucleus-nucleus reactions at intermediate energies. The obtained nuclear break-up time for the 129 Xe + nat Sn reaction at 50A MeV is ∆τ ≈ 100 -300 fm/c for all reaction centralities. The lifetime of the radiating sources produced in seven other different heavy-ion reactions studied by the TAPS experiment ar… Show more

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Cited by 12 publications
(9 citation statements)
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“…This reminded of the evolution of the predicted limiting temperatures caused by Coulomb instabilities [179,180]. More recently, caloric curves were published which use the temperatures obtained from hard thermal photon spectra [171,181]. The results do not clearly exhibit a plateau, but above 3-4 MeV/nucleon of excitation the caloric curves fall below that expected for the Fermi gas.…”
Section: Caloric Curvesmentioning
confidence: 99%
See 1 more Smart Citation
“…This reminded of the evolution of the predicted limiting temperatures caused by Coulomb instabilities [179,180]. More recently, caloric curves were published which use the temperatures obtained from hard thermal photon spectra [171,181]. The results do not clearly exhibit a plateau, but above 3-4 MeV/nucleon of excitation the caloric curves fall below that expected for the Fermi gas.…”
Section: Caloric Curvesmentioning
confidence: 99%
“…For multifragmenting systems, the slopes of light product spectra lead to very high "temperatures", and do not probably reflect only the thermal properties of the system, but also the collective energies coming from the dynamics of the nuclear collision. It was recently proposed to derive the temperature of the fragmenting system from the slope of the thermal hard photons [171], which have the advantage of being insensitive to Coulomb field and final-state effects: temperatures close to 7 MeV are for example obtained for central Xe+Sn collisions at 50 MeV/nucleon.…”
Section: Temperature Measurementsmentioning
confidence: 99%
“…In fact, photon production in heavy-ion reactions has been extensively studied in experiment and theory [23][24][25]. For example, the hard photon from neutron-proton bremsstrahlung is employed to probe the nuclear caloric curve [26], the dynamics of nucleon-nucleon interactions [27][28][29], the time-evolution of the reaction process before nuclear break-up [30] as well as the space-time extent of the photon emitting sources [31]; and the soft photon from giant dipole resonances in heavy-ion reactions is used to study the symmetry potential term of the nucleon-nucleon interactions [32]. A natural question is whether the photon can be used as a potential sensitive probe of the neutron-skin thickness in nuclear reactions.…”
Section: +016mentioning
confidence: 99%
“…An equal bremsstrahlung component is expected for the 36,40 A + 96,92 Zr reactions because of their very similar beam energy and size of the reaction partners and of the same temperature of the composite system (see Ref. [38] and references therein). This is largely confirmed by the data of the two reactions, which are equal within errors for E γ 21 MeV and for all the considered angles.…”
Section: B γ Spectramentioning
confidence: 99%
“…The lack of statistics for γ rays with E γ > 30 MeV prevented us from performing a fit with two exponential functions that should simulate adequately the thermal and the direct components of np bremsstrahlung emission (see Refs. [40] and [38] and references therein). Our procedure ensures that at least the direct (first chance) bremsstrahlung component was properly subtracted from our spectra.…”
Section: B γ Spectramentioning
confidence: 99%