Time sequence and time scale of intermediate mass fragment emission

Filippo, E. De; Pagano, A.; Wilczyńskí, J.; Amorini, F.; Anzalone, A.; Auditore, L.; Baran, V.; Berceanu, I.; Blicharska, J.; Brzychczyk, J.; Bonasera, A.; Borderie, B.; Bougault, R.; Bruno, M.; Cardella, G.; Cavallaro, S.; Chatterjee, M. B.; Chbihi, A.; Cibor, J.; Colonna, M.; D’Agostino, M.; Dayras, R.; Toro, M. Di; Frankland, J.D.; Galichet, E.; Gawlikowicz, W.; Geraci, E.; Giustolisi, F.; Grzeszczuk, A.; Guazzoni, P.; Guinet, D.; Iacono-Manno, M.; Kowalski, S.; Guidara, E. La; Lanzanó, G.; Lanzalone, G.; Neindre, N. Le; Li, S.; Maiolino, C.; Majka, Z.; Papa, M.; Petrovici, M.; Piasecki, E.; Pirrone, S.; Płaneta, R.; Politi, G.; Pop, A.; Porto, F.; Rivet, M. F.; Rosato, E.; Rizzo, F.; Russo, Simone; Russotto, P.; Sassi, M.; Schmidt, K.; Siwek‐Wilczyńska, K.; Skwira, I.; Sperduto, M. L.; Świderski, Ł.; Trifiró, A.; Trimarchi, M.; Vannini, G.; Vigilante, M.; Wieleczko, J. P.; Wu, Huiqin; Zhang, Xiao; Zetta, L.; Zipper, W.

doi:10.1103/physrevc.71.044602

Cited by 69 publications

(41 citation statements)

References 21 publications

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“…Particle-particle correlations [23][24][25], velocity correlations [26][27][28][29], fission fragment angular distributions [30], and Coulomb proximity affects [21,22,[31][32][33] have been used in attempts to extract information on the emission time of fragments. The proximity of the PLF and TLF to the midrapidity LCPs can be exploited to provide information on their emission time since particles emitted at early stages in the reaction will feel an increased Coulomb potential due to the increased proximity.…”

Section: Introductionmentioning

confidence: 99%

Correlations with projectile-like fragments and emission order of light charged particles

et al. 2012

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Correlations of midrapidity light charged particles (LCPs) and intermediate mass fragments (IMFs) with projectile-like fragments (PLFs) have been examined from the 35 MeV/u 70 Zn + 70 Zn, 64 Zn + 64 Zn, and 64 Ni + 64 Ni reaction systems. A new method was developed to examine the flow of the particles with respect to the PLF. The invariant PLF-scaled flow allowed for the dynamics of the midrapidity Z = 1-4 particles to be studied. Strong differences in the PLF-scaled flow were observed between the different isotopes. In particular, the most n-rich LCPs exhibited a negative PLF-scaled flow in comparison to the other LCPs. A classical molecular dynamics model and a three-body Coulomb trajectory simulation were both used to show that the PLF-scaled flow observable could be connected to the average order of emission of the LCPs. The experimental results suggest that the midrapidity region is preferentially populated with neutron-rich LCPs and Z = 3-4 IMFs at a relatively early stage in the collision. The deuteron and 3 He particles are emitted later followed, lastly, by protons and alphas. The average order of emission of the midrapidity LCPs was extracted from the constrained molecular dynamics simulations and showed good agreement with the emission order suggested by the experimental PLF-scaled flow results.

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Section: Introductionmentioning

confidence: 99%

Correlations with projectile-like fragments and emission order of light charged particles

et al. 2012

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“…In heavy-ion collisions at intermediate energies the largest part of the reaction cross section corresponds to binary events, characterized by the presence in the exit channel of two heavy remnants, the quasiprojectile and the quasitarget. Together with these heavy remnants one observes LCPs and intermediate mass fragments (IMFs, with 3 Z 16) produced by their evaporative decay and possibly by midvelocity emissions (see, e.g., [16][17][18]). The transverse energy of LCPs was used to estimate the centrality of the collisions [16,19].…”

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confidence: 99%

Persistence of odd-even staggering in charged-fragment yields from112Sn+58Ni collisions at 35 MeV/nucleon

Casini¹,

Piantelli²,

Maurenzig³

et al. 2012

Phys. Rev. C

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Odd-even staggering effects on charge distributions are investigated for fragments produced in semiperipheral and central collisions of 112 Sn + 58 Ni at 35 MeV/nucleon. For fragments with Z 16 one observes a clear overproduction of even charges, which decreases for heavier fragments. Staggering persists up to Z ∼ 30. The staggering appears to be substantially independent of the centrality of the collisions, suggesting that it is mainly related to the last few steps in the decay of hot nuclei.

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“…In Heavy-Ion collisions at Fermi energies the production of Light Particles and Intermediate Mass Fragments (IMFs), here defined as fragments with atomic number Z ≥ 3, is due to different reaction mechanisms related to different time scales [1][2][3][4][5][6][7][8][9][10][11][12]. This was seen in semi-peripheral collisions where coexistence of light IMFs emission from prompt neckfragmentation process [1, 2, 4-6, 9, 10], projectile-like fragments (PLF*) collinear massive break-up [3,5,7,8,13,14] and equilibrated PLF* binary fission-like emission [7,10,13,14] has been reported within the same range of large relative impact parameters. Thus, within a narrow range of initial kinematical nucleus-nucleus conditions of relative energy and angular momenta, the competition among different mechanisms having a large difference in the time scale, from prompt IMFs emissions (dozens of fm/c) to equilibrated decay (≫ 300f m/c), has been observed.…”

Section: Introductionmentioning

confidence: 99%

Dynamical versus statistical production of Intermediate Mass Fragments at Fermi Energies

et al. 2020

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The Intermediate Mass Fragments emission probability from Projectile-Like Fragment break-up in semi-peripheral reactions has been measured in collisions of 124 Xe projectiles with two different targets of 64 Ni and 64 Zn at the laboratory energy of 35 A MeV. The two colliding systems differ only for the target atomic number Z and, consequently, for the Isospin N/Z ratio. An enhancement of Intermediate Mass Fragments production for the neutron rich 64 Ni target, with respect to the 64 Zn, is found. In the case of one Intermediate Mass Fragment emission, the contributions of the dynamical and statistical emissions have been evaluated, showing that the increase of the effect above is due to an enhancement of the dynamical emission probability, especially for heavy IMFs (Z 7). This proves an influence of the target Isospin on inducing the dynamical fragment production from Projectile-Like Fragment break-up. In addition, a comparison of the Xe+Ni,Zn results with the previously studied 112,124 Sn+ 58,64 N i systems is discussed in order to investigate the influence of the projectile Isospin alone and to disentangle between Isospin effects against systemsize effects on the emission probability. These comparisons suggest that the prompt-dynamical emission is mainly ruled by the N/Z content of, both, projectile and target; for the cases here investigated, the influence of the system size on the dynamical emission probability can be excluded.

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Time sequence and time scale of intermediate mass fragment emission

Cited by 69 publications

References 21 publications

Correlations with projectile-like fragments and emission order of light charged particles

Correlations with projectile-like fragments and emission order of light charged particles

Persistence of odd-even staggering in charged-fragment yields from112Sn+58Ni collisions at 35 MeV/nucleon

Dynamical versus statistical production of Intermediate Mass Fragments at Fermi Energies

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