Study of angular momentum effect on the fission process by angular anisotropy method in heavy-ion-induced reactions

2020 ◽  
Vol 29 (04) ◽  
pp. 2050017
Author(s):  
Ghazaaleh Ashrafi ◽  
Saeed Soheyli ◽  
Morteza Khalil Khalili
Keyword(s):  
Angular Momentum ◽  
Barrier Height ◽  
Compound Nucleus ◽  
Heavy Ion ◽  
Quadrupole Deformation ◽  
Moment Of Inertia ◽  
Fission Barrier ◽  
Angular Anisotropy ◽  
Effective Moment ◽  
Effective Moment Of Inertia

The study of compound nucleus characteristics through fission fragment properties is a powerful tool to understand the fission mechanism of excited nuclei formed in heavy-ion-induced reactions. In this work, angular anisotropies of fission fragments from fissioning nuclei [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] with normal behaviors in angular anisotropy have been analyzed. In this way, the quadrupole deformation parameter of the compound nucleus is calculated by comparison between the experimental data of angular anisotropy and those predicted by the standard saddle-point statistical model. Then the rotational energy, the fission barrier height, and the effective moment of inertia of the compound nucleus are obtained through the calculated quadrupole deformation parameters. It is observed that the quadrupole deformation parameter decreases with increasing the mean square angular momentum. The obtained results illustrate that the rotational energy and the effective moment of inertia increase almost linearly with increasing the mean square angular momentum, while the fission barrier height decreases as expected. However, the calculated values of fission barrier height overestimate the rotating finite-range model predictions. Also, the calculated values of effective moment of inertia represent a nearly linear trend despite those predicted by the rotating finite-range model. In order to discuss the physical ideas underlying the effect of angular momentum on the fission properties, the interaction potential energy during the capture process is studied for the lightest and heaviest reaction systems.

New Equations To Establish The Effective Moment Of Inertia Of Composite Slabs With Profiled Steel Sheeting For Deflection Calculation

2020 ◽  
pp. 102135
Author(s):  
Rodrigo Sernizon Costa ◽  
Armando Cesar Campos Lavall ◽  
Renata Gomes Lanna da Silva ◽  
Harley Francisco Viana ◽  
Francisco Carlos Rodrigues ◽  
...  
Keyword(s):  
Moment Of Inertia ◽  
Effective Moment ◽  
Composite Slabs ◽  
Effective Moment Of Inertia

scholarly journals ENTRAINMENT FACTOR OF INDIVIDUAL GLITCH FRACTIONAL MOMENT OF INERTIA

2019 ◽  
Vol 55 (1) ◽  
pp. 3-9
Author(s):  
I. O. Eya ◽  
J. O. Urama ◽  
A. E. Chukwude
Keyword(s):  
Neutron Star ◽  
Moment Of Inertia ◽  
Fractional Moment ◽  
Effective Moment ◽  
Effective Moment Of Inertia

The superfluid in the inner crust of a neutron star is assumed to be the reservoir of momentum released in a pulsar glitch. Recently, due to crustal entrainment, it appears debatable whether the magnitude of the inner crust is sufficient to contain the superfluid responsible for large glitches. This paper calculates the fractional moment of inertia (FMI)(i.e. the ratio of the inner crust superfluid moment of inertia to that of the coupled components) associated with individual glitches. It is shown that the effective moment of inertia associated with the transferred momentum is that of the entrained neutrons. The FMI for glitches in three pulsars, which exhibit the signature of exhausting their momentum reservoir, were calculated and scaled with the entrainment factor. Some of the glitches require an inner crust superfluid with moment of inertia larger than the current suggested values of 7-10% of the stellar moment of inertia.

SUM RULE FOR MULTISCALE REPRESENTATIONS OF KINEMATICALLY DESCRIBED SYSTEMS

2002 ◽  
Vol 05 (04) ◽  
pp. 409-431 ◽  
Author(s):  
YANEER BAR-YAM
Keyword(s):  
Kinetic Energy ◽  
Degrees Of Freedom ◽  
Collective Motion ◽  
Space Time ◽  
Moment Of Inertia ◽  
Sum Rule ◽  
Effective Moment ◽  
External Frame ◽  
The Moment ◽  
Effective Moment Of Inertia

We derive a sum rule that constrains the scale based decomposition of the trajectories of finite systems of particles. The sum rule reflects a tradeoff between the finer and larger scale collective degrees of freedom. For short duration trajectories, where acceleration is irrelevant, the sum rule can be related to the moment of inertia and the kinetic energy (times a characteristic time squared). Thus, two nonequilibrium systems that have the same kinetic energy and moment of inertia can, when compared to each other, have different scales of behavior, but if one of them has larger scales of behavior than the other, it must compensate by also having smaller scales of behavior. In the context of coherence or correlation, the larger scale of behavior corresponds to the collective motion, while the smaller scales of behavior correspond to the relative motion of correlated particles. For longer duration trajectories, the sum rule includes the full effective moment of inertia of the system in space-time with respect to an external frame of reference, providing the possibility of relating the class of systems that can exist in the same space-time domain.

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