Experimental determination of fragment excitation energies in multifragmentation events

Marie, N.; Chbihi, A.; Natowitz, J. B.; Févre, A. Le; Salou, S.; Wieleczko, J. P.; Gingras, L.; Assenard, M.; Auger, G.; Bacri, C.O.; Bocage, F.; Borderie, B.; Bougault, R.; Brou, R.; Buchet, P.; Charvet, J. L.; Cibor, J.; Colin, J.; Cussol, D.; Dayras, R.; Demeyer, A.; Doré, D.; Durand, D.; Eudes, P.; Frankland, J.D.; Galichet, E.; Genouin-Duhamel, E.; Gerlic, E.; Germain, M.; Gourio, D.; Guinet, D.; Hagel, K.; Lautesse, P.; Laville, J.L.; Lecolley, J.F.; Lefort, T.; Légrain, R.; Neindre, N. Le; Lopez, O.; Louvel, M.; Majka, Z.; Maskay, A. M.; Nalpas, L.; Nguyen, A.D.; Pârlog, M.; Péter, J.; Plagnol, E.; Rahmani, A.; Reposeur, T.; Rivet, M. F.; Rosato, E.; Saint‐Laurent, F.; Steckmeyer, J.C.; Stern, M.; Tăbăcaru, G.; Tamain, B.; Tirel, O.; Vient, E.; Volant, C.; Wada, Ryoichi

doi:10.1103/physrevc.58.256

Cited by 80 publications

(82 citation statements)

References 18 publications

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“…A very similar conclusion as drawn in the present work has also been deduced from light charged particles emitted from intermediate-mass fragments in the range from Z = 2 to Z = 30 produced in central collisions of 129 Xe + nat Sn at 50 A MeV [40]: In this work with the fragment-particle correlation method, a limiting temperature around 5 MeV was deduced, below which "primary fragments deexcite only by evaporation". Thus, heavy-ion collisions in very different energy regimes show signatures of the same phenomenon.…”

Section: General Understanding Of Heavy-residue Production In Relativsupporting

confidence: 67%

Production of neutron-rich heavy residues and the freeze-out temperature in the fragmentation of relativistic U projectiles determined by the isospin thermometer

et al. 2002

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Isotope yields of heavy residues produced in collisions of 238 U with lead at 1⋅A GeV show indications for a simultaneous break-up process. From the average N-over-Z ratio of the final residues up to Z = 70, the average limiting temperature of the break-up configuration at freeze out was determined to T § 0H9 XVLQJ WKH LVRVSLQ-thermometer method. Consequences for the understanding of other phenomena in highly excited nuclear systems are discussed.

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Section: General Understanding Of Heavy-residue Production In Relativsupporting

confidence: 67%

Production of neutron-rich heavy residues and the freeze-out temperature in the fragmentation of relativistic U projectiles determined by the isospin thermometer

et al. 2002

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“…Experimental methods, e.g. based on correlation techniques [40], may prove very useful for this purpose.…”

Section: E Secondary Deexcitation Of Fragmentsmentioning

confidence: 99%

Isoscaling in light-ion induced reactions and its statistical interpretation

2002

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Isotopic effects observed in fragmentation reactions induced by protons, deuterons, and α particles of incident energies between 660 MeV and 15.3 GeV on 112 Sn and 124 Sn targets are discussed. The exponential scaling of the yield ratios with the third component of the fragment isospin t3 = (N − Z)/2 is observed in all reactions, with scaling parameters that depend on the incident energy. Breakup temperatures for these reactions are deduced from double ratios of isotopic yields and tested for their relation with the isoscaling parameters.The quantum statistical (QSM) and the statistical multifragmentation (SMM) models are used for interpreting the results. The observed isoscaling can be understood as a consequence of a statistical origin of the emitted fragments in these reactions. The SMM analysis shows that the exponent describing the isoscaling behavior is proportional to the strength of the symmetry term of the fragment binding energy. Using this result, a symmetry-term coefficient γ ≈ 22.5 MeV for fragments at breakup is deduced from the experimental data. This is close to the standard value and supports SMM assumptions for the breakup configuration. An alternative method of determining the symmetry-energy coefficient, by using isotope distribution widths, is also discussed.

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“…Light charged particle correlation functions were heavily investigated in the past (see [32,33] for reviews and [34,35,11]). A new technique, taking advantage of both the height and the width of the correlation functions was recently developed, allowing to disentangle fast and slow emission components [36].…”

Section: Velocity Correlationsmentioning

confidence: 99%

Multifragmentation of very heavy nuclear systems (III): Fragment velocity correlations and event topology at freeze-out

et al. 2006

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Kinetic energy spectra and fragment velocity correlations, simulated by means of stochastic mean-field calculations, are successfully confronted with experimental data for single multifragmenting sources prepared at the same excitation energy per nucleon in 32 AMeV 129 Xe+ nat Sn and 36 AMeV 155 Gd+ nat U central collisions. Relying thus on simulations, average freeze-out times of 200-240 fm/c are estimated The corresponding spatial distributions of fragments are more compact for the lighter system (∼3-4V 0 vs ∼8V 0 ).

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Experimental determination of fragment excitation energies in multifragmentation events

Cited by 80 publications

References 18 publications

Production of neutron-rich heavy residues and the freeze-out temperature in the fragmentation of relativistic U projectiles determined by the isospin thermometer

Production of neutron-rich heavy residues and the freeze-out temperature in the fragmentation of relativistic U projectiles determined by the isospin thermometer

Isoscaling in light-ion induced reactions and its statistical interpretation

Multifragmentation of very heavy nuclear systems (III): Fragment velocity correlations and event topology at freeze-out

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