Preequilibrium emission observed in the correlation between light particles and evaporation residues for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>84</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Kr</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mo>+</mml:mo></mml:mrow><mml:mrow><mml:mn>27</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Al</mml:mi></mml:math>system

Campo, J. Gómez del; Shapira, D.; McConnell, J.W.; Gross, C. J.; Stracener, D. W.; Madani, H.; Chávez, E.; Ortíz, M. E.

doi:10.1103/physrevc.60.021601

Cited by 12 publications

(8 citation statements)

References 16 publications

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“…At energy below 10 MeV/nucleon, on the other hand, light particle emissions have been well described by fusion-evaporation scenario. At energies above 10 MeV/nucleon, pre-equilibrium emissions have been observed and they are consistent to a pre-equilibrium model based on the Boltzmann master equation [15][16][17]. Above 20 MeV/nucleron, the IV source of protons is also described reasonably by this scenario [8,18].…”

Section: Introductionmentioning

confidence: 65%

Nuclear stopping and light charged particle emission in C12+C12 at 95 MeV/nucleon

et al. 2017

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Detailed comparisons between the experimental data of 12 C + 12 C at 95 A MeV and transport model simulations are presented for all charged particles and fragments. For the simulations, AMD, a modified version of AMD (AMD-FM), and CoMD, are used. The experimental energy spectra and angular distributions are well reproduced by the AMD-FM calculations for light charged particles with Z ≤ 2. We show that the nuclear stopping plays a key role for these observables. The production mechanisms of LCPs are discussed. The angular distributions of isotopes with Z > 2 are qualitatively reproduced reasonably well, but the yields are 2 − 10 times smaller in the simulations for most isotopes.

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Section: Introductionmentioning

confidence: 65%

Nuclear stopping and light charged particle emission in C12+C12 at 95 MeV/nucleon

et al. 2017

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“…The problem of different emissions, before a complete thermalization could occur, shows up as soon as the bombarding energy grows up, especially approaching 10 MeV/u. A certain progress has been achieved in the understanding of pre-equilibrium emission of Light Charged Particles (LCP) [3][4][5] and neutrons [5][6][7][8] during the past two decades. Nevertheless, the knowledge on the fast emission processes, showing a dependence on both the entrance channel massasymmetry and on the beam velocity, is far from being complete.…”

Section: Introductionmentioning

confidence: 99%

Light Particle Emission Mechanisms in Heavy-Ion Reactions at 5-20 MeV/u

Kravchuk

Barlini

Fotina

2010

EPJ Web of Conferences

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Abstract. Light Charged Particle emission mechanisms were studied for different mass entrance channel nuclear reactions. The 300, 400, 500 MeV 64 Ni + 68 Zn and 130, 250 MeV 16 O + 116 Sn reactions were measured at the Legnaro National Laboratory using the beams from the TANDEM-ALPI acceleration system. Light Charged Particles were measured in coincidence with Evaporation Residues and their spectra were analyzed using the global moving source fit technique. The characterization of different emission sources (evaporative, pre-equilibrium, break-up) is discussed. The behavior of pre-equilibrium emission as a function of projectile energy, excitation energy and mass-asymmetry in the entrance channel was studied, evaluating the energy, mass and charge lost by the composite systems and using Griffin exciton model for the pre-equilibrium neutron emission. The present results are compared with the systematics of the asymmetric mass entrance channel reactions. The present work shows that also at the onset the pre-equilibrium emission depends not only on the projectile velocity but also on the reaction entrance channel mass-asymmetry. The first attempt of the particle spectra analysis using the Griffin exciton model is demonstrated for the case of proton emission in the 130 MeV 16 O + 116 Sn reaction.

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“…The pre-compound (PCN) emission process in heavy ion reactions at relatively low energies ranging from 4 to 7 MeV/nucleon has been a topic of recent interest [1], since it is, generally, expected to occur at relatively high energies ⇡10-15 MeV/nucleon [2]. The PCN process may be understood as the fusion of two heavy nuclei in such a way so that a composite nucleus forms far from the statistical equilibrium, and a large fraction of its energy is considered to be in the form of an orderly translational motion of the nucleons of the projectile and target nucleus [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Although, information about the momentum transfer in heavy ion reaction may also be obtained by several methods [2,15,16], in the present measurements this information has been obtained from the study of the recoil range distributions (RRDs) and the spin distributions (SDs) of the reaction residues. Since emitted PCN particles takes away a significant part of angular momentum as compared to CN particles, the angular momentum associated with the PCN products is relatively lower than that associated with the CN process.…”

Section: Introductionmentioning

confidence: 99%

Pre-compound emission in low-energy heavy-ion interactions

Sharma¹,

Shuaib

Sharma

et al. 2017

EPJ Web Conf.

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Abstract. Recent experimental studies have shown the presence of pre-compound emission component in heavy ion reactions at low projectile energy ranging from 4 to 7 MeV/nucleons. In earlier measurements strength of the pre-compound component has been estimated from the di↵erence in forward-backward distributions of emitted particles. Present measurement is a part of an ongoing program on the study of reaction dynamics of heavy ion interactions at low energies aimed at investigating the e↵ect of momentum transfer in compound, precompound, complete and incomplete fusion processes in heavy ion reactions. In the present work on the basis of momentum transfer the measurement of the recoil range distributions of heavy residues has been used to decipher the components of compound and pre-compound emission processes in the fusion of 16 O projectile with 159 Tb and 169 Tm targets. The analysis of recoil range distribution measurements show two distinct linear momentum transfer components corresponding to pre-compound and compound nucleus processes are involved. In order to obtain the mean input angular momentum associated with compound and pre-compound emission processes, an online measurement of the spin distributions of the residues has been performed. The analysis of spin distribution indicate that the mean input angular momentum associated with pre-compound products is found to be relatively lower than that associated with compound nucleus process. The pre-compound components obtained from the present analysis are consistent with those obtained from the analysis of excitation functions.

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Preequilibrium emission observed in the correlation between light particles and evaporation residues for the84Kr+27Alsystem

Cited by 12 publications

References 16 publications

Nuclear stopping and light charged particle emission in C12+C12 at 95 MeV/nucleon

Nuclear stopping and light charged particle emission in C12+C12 at 95 MeV/nucleon

Light Particle Emission Mechanisms in Heavy-Ion Reactions at 5-20 MeV/u

Pre-compound emission in low-energy heavy-ion interactions

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