Fragmentation of Necklike Structures

Montoya, C. P.; Lynch, W. G.; Bowman, D. R.; Peaslee, Graham F.; Carlin, N.; Souza, R. T. de; Gelbke, C. K.; Gong, W. G.; Kim, Y. D.; Lisa, M. A.; Phair, L.; Tsang, M. B.; Webster, Jason; Williams, C.; Colonna, N.; Hanold, K.; McMahan, M. A.; Wozniak, G.J.; Moretto, L.G.

doi:10.1103/physrevlett.73.3070

Cited by 140 publications

(86 citation statements)

References 21 publications

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“…This anti-correlation signals that both fragments do on average originate from a common parent fragment. For a second largest fragment with Z=6, the Z P LF * is ≈40 consistent with dynamical breakup [40,43]. While mid-peripheral (mid-central) collisions exhibit an anticorrelation, Z T OT changes from ≈45 (45) at high Z P LF * to ≈40 (35) at low Z P LF * .…”

Section: General Reaction Characteristicsmentioning

confidence: 99%

Short timescale behavior of colliding heavy nuclei at intermediate energies

2006

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An Antisymmetrized Molecular Dynamics model is used to explore the collision of 114 Cd projectiles with 92 Mo target nuclei at E/A=50 MeV over a broad range in impact parameter. The atomic number (Z), velocity, and emission pattern of the reaction products are examined as a function of the impact parameter and the cluster recognition time. The non-central collisions are found to be essentially binary in character resulting in the formation of an excited projectile-like fragment (PLF * ) and target-like fragment (TLF * ). The decay of these fragments occurs on a short timescale, 100≤t≤300 fm/c. The average excitation energy deduced for the PLF * and TLF * 'saturates for mid-central collisions, 3.5≤b≤6 fm, with its magnitude depending on the cluster recognition time. For short cluster recognition times (t=150 fm/c), an average excitation energy as high as ≈6 MeV is predicted. Short timescale emission leads to a loss of initial correlations and results in features such as an anisotropic emission pattern of both IMFs and alpha particles emitted from the PLF * and TLF * in peripheral collisions.

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Section: General Reaction Characteristicsmentioning

confidence: 99%

Short timescale behavior of colliding heavy nuclei at intermediate energies

2006

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“…Statistical decay models are widely used and dedicated to describe the decay of hot fully equilibrated systems, defined as systems having reached energy, shape and isospin equilibrium [1,2,3,4,5,6,7,8,9]. However other experimental works show strong effects of the entrance channel on the decay modes of the formed hot systems [10,11,12,13,14,15,16,17,18,19,20,21,22,23]. These effects which are not taken into account in the statistical decay models can provide complementary information on the nuclei such as the characteristics of the nucleon-nucleon interaction [24,25,26,27] and/or the viscosity of the nuclear matter.…”

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confidence: 99%

Dynamical effects in multifragmentation at intermediate energies

Colin¹,

Cussol²,

Normand³

et al. 2003

Phys. Rev. C

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The fragmentation of the quasi-projectile is studied with the INDRA multidetector for different colliding systems and incident energies in the Fermi energy range. Different experimental observations show that a large part of the fragmentation is not compatible with the statistical fragmentation of a fully equilibrated nucleus. The study of internal correlations is a powerful tool, especially to evidence entrance channel effects. These effects have to be included in the theoretical descriptions of nuclear multifragmentation.

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“…For instance, the charge distribution of IMF emitted from the neck region has a higher yield between Carbon and Oxygen, when compared to the corresponding yield of fragments from QP (at fixed Z value). Indeed, the ratio of the two yields shows a classical bell-shape [2,3], clear indication that the IMF fragments are the product of a dynamical process (see for instance Fig.4a of Ref. [3]).…”

Section: The Midperipheral Collisionsmentioning

confidence: 92%

“…On the contrary, processes leading to the formation of neck-like structures can not be described on the basis of statistical approaches and are connected to the dynamics of the collision [2,3,4]. Therefore, one of the central issues concerning the multifragmentation process is the interplay between the attainment of the thermal and chemical equilibrium of the excited nuclear matter prior to the production of fragments and the dynamics of their emission.…”

Section: Introductionmentioning

confidence: 99%

The reaction entrance channel and isotopic composition of fragments in a dynamical and statistical multifragmentation regime

Milazzo¹,

Margagliotti²,

Rui³

et al. 2004

Braz. J. Phys.

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From the study of the Ni+Ni,Ag 30 MeV/nucleon dissipative midperipheral collisions, it has been possible to detect events in which Intermediate Mass Fragments (IMF) are emitted by two different sources with different mechanisms. The sources are: a) a quasi-projectile (QP) (and a quasi-target (QT)), with an excitation energy that leads to multifragmentation totally described in terms of a statistical disassembly of a thermalized system (T 4. MeV, E * 4 MeV/nucleon); b) an intermediate source, emitting both light particles and IMF. In this second case, fragments are more neutron rich than the average matter of the overall system, and have a very different charge distribution, with respect to those statistically emitted from the QP. The above features can be considered as a signature of the dynamical origin of the midvelocity emission. The results of this analysis show that IMF can be produced via different mechanisms simultaneously present within the same collision. They also show that the probability of IMF production via dynamical reaction increase with the size of the target nucleus.

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Fragmentation of Necklike Structures

Cited by 140 publications

References 21 publications

Short timescale behavior of colliding heavy nuclei at intermediate energies

Short timescale behavior of colliding heavy nuclei at intermediate energies

Dynamical effects in multifragmentation at intermediate energies

The reaction entrance channel and isotopic composition of fragments in a dynamical and statistical multifragmentation regime

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