Compound-Nucleus Decay via the Emission of Heavy Nuclei

Sobotka, L. G.; Padgett, M. L.; Wozniak, G. J.; Guarino, G.; Pacheco, A.; Moretto, L. G.; Chan, Y.; Stokstad, R.G.; Tserruya, I.; Wald, S.

doi:10.1103/physrevlett.51.2187

Cited by 132 publications

(44 citation statements)

References 11 publications

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“…However, in agreement with an earlier theory [9], complex fragment emission from a compound nucleus has been observed at very small incident energies, below 50 Me V total center-of-mass energy, albeit with very low (submicrobarn) cross-sections [10][11][12]. Furthermore, in a series of experiments starting at this low energy and continuing to 30 MeV/u, it has been verified that the decay of an equilibrated compound nucleus can account for the major production of complex fragments in a process akin to fission [13].…”

supporting

confidence: 75%

Complex fragment emission at 50 MeV/u: Compound nuclei forever?

Bowman¹,

Kehoe²,

Charity³

et al. 1987

Physics Letters B

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Abstract:Fragments with 12:5 Z:5 35 have been detected in the reaction of 50 MeV/u 139La on 12C and are shown to be produced solely by the binary decay of a compound nucleus formed in an incomplete fusion reaction. The source velocity, c.m. velocities, cross-sections, and angular distributions extracted from the inclusive data are entirely consistent with this mechanism. The binary coincidence data confirm this interpretation and can be quantitatively accounted for by the singles data.(a) Present address: Kaman Sciences, 2560 Huntington Ave., Alexandria, VA 22303.

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supporting

confidence: 75%

Complex fragment emission at 50 MeV/u: Compound nuclei forever?

Bowman¹,

Kehoe²,

Charity³

et al. 1987

Physics Letters B

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“…Most early multifragmentation experiments are inclusive measurements [15][16][17][18][19][20], i.e. particles are identified with no requirements that other particles from the same event should be detected in coincidence.…”

Section: Event Selectionmentioning

confidence: 99%

Liquid-Gas Phase Transition in Nuclear Multifragmentation

Gupta

Mekjian

Tsang

2001

Advances in the Physics of Particles and Nuclei

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The equation of state of nuclear matter suggests that at suitable beam energies the disassembling hot system formed in heavy ion collisions will pass through a liquid-gas coexistence region. Searching for the signatures of the phase transition has been a very important focal point of experimental endeavours in heavy-ion collisions, in the last fifteen years. Simultaneously theoretical models have been developed to provide information about the equation of state and reaction mechanisms consistent with the experimental observables.

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“…The 8 Be * propagates in the Coulomb field of the emitting nucleus until it decays. At the moment of decay the 8 Be * is replaced with two α particles with an inter-α separation distance (scission configuration) given by R α−α = 5.81 fm in accordance with systematics [15]. Selecting a smaller quadrupole moment, namely R α−α = 4 fm, makes a negligible difference in the final results.…”

mentioning

confidence: 99%

Tidal Effects and the Proximity Decay of Nuclei

et al. 2007

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We examine the decay of the 3.03 MeV state of 8 Be evaporated from an excited projectile-like fragment following a peripheral heavy-ion collision. The relative energy of the daughter α particles exhibits a dependence on the decay angle of the 8 Be * , indicative of a tidal effect. Comparison of the measured tidal effect with a purely Coulomb model suggests the influence of a measurable nuclear proximity interaction. Aggregation of clusters in a dilute medium is a process that impacts a wide range of physical phenomena from the formation of galactic structure[? ] to formation of Van der Waals clusters in a low density gas [? ]. This aggregation can involve the delicate interplay of elementary forces that results in a frustrated system. One such example is the formation of pasta nuclei in the crust of a neutron star [1,2]. For smaller systems, the phenomenon of alpha clustering is important both in low density nuclear matter [3], as well as in light nuclei [4]. In the case of heavy nuclei, cluster aggregation is manifested in the spontaneous phenomenon of clusters, from the common process of α decay to the emission of more exotic clusters such as 14 C [5]. The reduction of density near the nuclear surface, allows formation of α particles, or other clusters, and their emission from either ground-state or modestly excited nuclei. Cluster emission, thus primarily probes the surface properties of the emitting nucleus [6]. Our present understanding of cluster emission is largely based upon the yields, kinetic energy spectra, and angular distributions of emitted clusters -all of which are well described within a statistical transition-state formalism [7]. In this Letter we present for the first time evidence for the modification of cluster emission by interaction with the nuclear surface. We probe the interaction of the nuclear surface with the emitted cluster by using resonance spectroscopy to examine the emission of 8 Be * and specifically explore how its decay is impacted by the tidal effect [8].Charged-particles produced in the reaction 114 Cd+ 92 Mo at E/A=50 MeV were detected in an exclusive 4π setup. To focus on evaporated fragments, we selected peripheral collisions through detection of forward-moving projectile-like fragments (PLFs) with 10≤Z≤48, in the angular range 2.1 • ≤θ lab ≤4.2 • with ∆θ lab ≈0.13 • [9]. This PLF is the decay residue of the excited primary projectile-like fragment (PLF * ) formed by the collision. Light-charged-particles and fragments with Z≤9 were isotopically identified [9] in the angular range 7 • ≤θ lab ≤58

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Compound-Nucleus Decay via the Emission of Heavy Nuclei

Cited by 132 publications

References 11 publications

Complex fragment emission at 50 MeV/u: Compound nuclei forever?

Complex fragment emission at 50 MeV/u: Compound nuclei forever?

Liquid-Gas Phase Transition in Nuclear Multifragmentation

Tidal Effects and the Proximity Decay of Nuclei

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