Isotopic effects in high-energy nuclear reactions and isospin correlations of fragmentation cross sections

Bogatin, V.I.; Litvin, V.F.; Lozhkin, O.V.; Perfilov, N.A.; Yakovlev, Yu. P.

doi:10.1016/0375-9474(76)90056-7

Cited by 27 publications

(22 citation statements)

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“…The N/Z ratio also decreases gradually for both targets with an apparently universal rate that does not depend much on the projectile energy nor on the neutron content of the target. As a consequence, the difference ∆(N/Z) on which the isotopic effect depends linearly in first order [3,9] remains approximately constant. The calculated cross sections show that the covered range of excitation energies depends strongly on the proton energy.…”

Section: Initial Dynamical Stagementioning

confidence: 98%

“…The experimental data are taken from the literature [8,9,10,12]. They were obtained in the JINR laboratories in Dubna with beams of protons of 660 MeV, 1.0 and 6.7 GeV, of deuterons with 3.1 GeV, and of α particles with 15.3 GeV incident energy.…”

Section: Experimental Datamentioning

confidence: 99%

“…From the yields, integrated over energy intervals specified in Refs. [8,10], ratios R 12 for the production of a particular fragment in the reactions with the two Sn isotopes were determined. It is convenient to introduce a reduced isotopic effect for a fragment species X by normalizing with respect to the ratio observed for 6 Li, i.e.…”

Section: Experimental Datamentioning

confidence: 99%

“…5. The differences of the energy intervals of the fragment detection [8,10] and the systematic errors associated with the isotope identification [12] are taken into account.…”

Section: Temperaturesmentioning

confidence: 99%

“…The isotopic scaling of this latter kind has first been reported for reactions of protons of 660 MeV energy incident on targets of 112,124 Sn [8,9] and subsequently also for other reactions with proton and deuteron projectiles in the relativistic regime of bombarding energies [10]. With the notation chosen in these early papers,…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Initial Dynamical Stagementioning

confidence: 98%

Section: Experimental Datamentioning

confidence: 99%

Section: Experimental Datamentioning

confidence: 99%

“…5. The differences of the energy intervals of the fragment detection [8,10] and the systematic errors associated with the isotope identification [12] are taken into account.…”

Section: Temperaturesmentioning

confidence: 99%