Hidatidosis de Fosa Renal

S, César Izzo

doi:10.4067/s0370-41061976000200011

Cited by 1 publication

(1 citation statement)

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“…With this correction applied, it is considered that within the angular cuts, the complete production intensity is measured. The method of yield reconstruction and transmission correction is described in details in [23,24]. The elastic scattering measured in SPIDER, which is tagged as a carbon event with no fission in coincidence is used to normalise the incoming beam intensity.…”

Section: Fission Experiments Using Inverse Kinematics At Coulomb Energymentioning

confidence: 99%

Isotopic fission fragment distributions as a deep probe to fusion-fission dynamics

Farget

Caamaño

Delaune

et al. 2013

J. Phys.: Conf. Ser.

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Abstract. During the fission process, the atomic nucleus deforms and elongates up to the two fragments inception and their final separation at the scission deformation. The evolution of the nucleus energy with deformation defines a potential energy landscape in the multidimensional deformation space. It is determined by the macroscopic properties of the nucleus, and is also strongly influenced by the single-particle structure of the nucleus, which modifies the macroscopic energy minima. The fission fragment distribution is a direct consequence of the deformation path the nucleus has encountered, and therefore is the most genuine experimental observation of the potential energy landscape of the deforming nucleus. Very asymmetric fusionfission reactions at energy close to the Coulomb barrier, produce well-defined conditions of the compound nucleus formation, where processes such as quasi-fission, pre-equilibrium emission and incomplete fusion are negligible. In the same time, the excitation energy is sufficient to reduce significantly structural effects, and mostly the macroscopic part of the potential is responsible for the formation of the fission fragments. We use inverse kinematics combined with a spectrometer to select and identify the fission fragments produced in 238 U+ 12 C at a bombarding energy close to and well-above the Coulomb barrier. For the first time, the isotopic yields are measured over the complete atomic-number distribution, between Z=30 and Z=63. In the experimental set-up, it is also possible to identify transfer-induced reactions, which lead to low-energy fission where the nuclear shell structure shows a strong influence on the fission-fragment distributions. The resulting set of data gives the possibility to observe the fission fragment properties over a wide range of excitation energy, and they reveal the vanishing of the shell effects in the potential energy of the fissioning nucleus, as well as the influence of fission dynamics. IntroductionFragment mass distributions produced in low excitation-energy fission of trans-uranium actinides are known for a long time to present in general a double-humped structure, the fragments being divided in two distinct groups, a heavy-fragment group and a light-fragment one [1]. With increasing mass of the fissioning nucleus, the heavy-fragment group shows a constant average mass, close to the value A=140, whereas the average mass of the light-fragment group increases. This double-humped structure has been understood as a signature for shell-structure influence in the potential energy describing the deforming nucleus from the ground state to the scission point deformation. The constant position of the heavy fragment distribution lead to the comprehension that the shell influence is in fact the single-particle structure inside the nascent fragments, and not in the fissioning nucleus. The most spread model for the description of the fission fragment distribution is based on the macro-microscopic description of the fissioning nucleus potential energy [2, 3...

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Section: Fission Experiments Using Inverse Kinematics At Coulomb Energymentioning

confidence: 99%