Spontaneous fission half-lives of heavy nuclei in ground state and in isomeric state

2005 ◽  
Vol 759 (1-2) ◽  
pp. 64-78 ◽  
Author(s):  
Zhongzhou Ren ◽  
Chang Xu
Keyword(s):  
Isomeric State ◽  
Ground State ◽  
Spontaneous Fission ◽  
Heavy Nuclei

NUCLEAR SURFACE OSCILLATION MODEL IN HEAVY NUCLEI FISSION

1996 ◽  
Vol 05 (02) ◽  
pp. 365-383 ◽  
Author(s):  
VLADIMIR P. GARISTOV
Keyword(s):  
Experimental Data ◽  
Ground State ◽  
Fission Fragment ◽  
Spontaneous Fission ◽  
High Energy ◽  
Nuclear Surface ◽  
Surface Oscillation ◽  
Heavy Nuclei ◽  
Density Distributions ◽  
Energy Components

The fission of many heavy nuclei shows a bimodal character, with both low and high-energy components in the kinetic energy distribution. These two components are thought to arise because the nucleus can choose two different paths to scission from the ground state; either a path leading to elongated scission shapes and low fission fragment kinetic energies or a path leading to the compact scission configuration of two touching spheres and high fission fragment kinetic energies. In the present paper we consider the second path. The vibration of the fragment surfaces leads to more realistic density distributions of the fragments. We consider that the neck density is responsible for the asymmetry and odd-even effects. Our results are compared with a large amount of experimental data in the cases of spontaneous fission of U, Pu, and Cf isotopes.

scholarly journals Chronicle of the discovery of the back-bending phenomenon in atomic nuclei: a personal recollection 50 years on

2021 ◽  
Vol 46 (1) ◽  
Author(s):  
Hans Ryde
Keyword(s):  
Nuclear Structure ◽  
Ground State ◽  
Energy Levels ◽  
Historical Context ◽  
Rotational Frequency ◽  
Heavy Nuclei ◽  
Atomic Nuclei ◽  
Key Points ◽  
The Moment ◽  
The Right

AbstractA chronicle describing the historical context and the development of ideas and experiments leading to the discovery of the back-bending phenomenon in rapidly rotating atomic nuclei some 50 years ago is presented. The moment of inertia of some atomic nuclei increases anomalously at a certain rotational frequency, revealing important clues to our understanding of nuclear structure. I highlight the decisive interactions and contacts between experimentalists and theorists, which created the right environment, allowing for the revelation of an undetected phenomenon in Nature. Finally, I reflect on the key points allowing for the discovery and particularly point to the importance of systematic surveys, which in this case investigated the energy levels in heavy nuclei of a large sample of elements, as well as to the accuracy of the measurements of the ground state levels made at the time.

scholarly journals Study of the 165Ho(n,2n)164Ho reaction at near threshold energies

2020 ◽  
Vol 27 ◽  
pp. 160
Author(s):  
Efstathia Georgali ◽  
N. Patronis ◽  
A. Anastasiadis ◽  
M. Axiotis ◽  
Z. Eleme ◽  
...  
Keyword(s):  
Cross Sections ◽  
Isomeric State ◽  
Ground State ◽  
Preliminary Analysis ◽  
Reaction Channel ◽  
Activation Technique ◽  
Monoenergetic Neutron ◽  
Theoretical Predictions ◽  
Threshold Energies ◽  
Near Threshold

The present work concerns the preliminary analysis for the study of the (n,2n) reaction channel of the 165Ho isotope at near threshold energies: 10.1, 10.4 and 10.7 MeV (Eth=8.04 MeV). The cross sections for the population of both the ground state (Jπ=1+) and the isomeric state (Jπ=6-, Eex=139.8 keV) of the 164Ho product-nucleus were measured at the afore mentioned energies via the activation technique relative to the 27Al(n,α)24Na and 197Au(n,2n)196Au reactions. The quasi-monoenergetic neutron beams were produced through the 2H(d,n)3He reaction in the 5.5 MV Tandem Van de Graaf accelerator of N.C.S.R ''Demokritos''. The preliminary experimental results are compared with theoretical predictions based on TALYS code.

Errata: Spontaneous fission half-lives for ground-state nuclides

2001 ◽  
Vol 73 (7) ◽  
pp. 1225-1227 ◽  
Author(s):  
N. E. Holden ◽  
D. C. Hoffman
Keyword(s):  
Ground State ◽  
Spontaneous Fission

scholarly journals FURTHER MICROSCOPIC STUDIES OF THE FISSION BARRIERS OF HEAVY NUCLEI

2012 ◽  
Vol 21 (05) ◽  
pp. 1250051 ◽  
Author(s):  
T. V. NHAN HAO ◽  
J. LE BLOAS ◽  
MENG-HOCK KOH ◽  
L. BONNEAU ◽  
P. QUENTIN
Keyword(s):  
Spontaneous Fission ◽  
The Self ◽  
Fission Barrier ◽  
Heavy Nuclei ◽  
Barrier Heights ◽  
Fission Barriers ◽  
Self Consistent ◽  
Microscopic Studies ◽  
Mean Fields ◽  
Approximate Treatment

Two systematic sources of error in most current microscopic evaluations of fission-barrier heights are studied. They are concerned with an approximate treatment of the Coulomb exchange terms (known as the Slater approximation) in the self-consistent mean-fields and the projection on good parity states (e.g., of positive parity for the spontaneous fission of an even–even nucleus) of left–right reflection asymmetric intrinsic solutions (e.g., around the second barrier). Approximate or unprojected solutions are shown to lead each to an underestimation of the barrier heights by a few hundred keV.

Nuclear structure properties of spin-1/2 heavy nuclei within the relativistic cluster model

2020 ◽  
Vol 29 (05) ◽  
pp. 2050026
Author(s):  
Keivan Darooyi Divshali ◽  
Mohammad Reza Shojaei
Keyword(s):  
Nuclear Structure ◽  
Beta Decay ◽  
Ground State ◽  
Cluster Model ◽  
Heavy Nuclei ◽  
Core Cluster ◽  
Phenomenological Potential ◽  
The Stability ◽  
Uvarov Method ◽  
Structure Properties

[Formula: see text]C is a beta decay isotope, its beta decay is very slow reflecting the stability of this nucleus and emitted from medium and heavy mass nuclei. The [Formula: see text]C result is in excellent agreement with the favored ground-state-to-ground-state transition according to the cluster model of Blendowske et al. We study nuclear structure properties of spin-1/2 heavy nuclei in the relativistic core-cluster model, that its cluster is [Formula: see text]C. According to this model for spin-1/2 heavy nuclei and for obtaining its wave function, we solve the Dirac equation with the new phenomenological potential by parametric Nikiforov–Uvarov method and then calculate the binding energy and charge radius.

Ground state properties of medium-heavy nuclei with a realistic interaction

1976 ◽  
Vol 13 (4) ◽  
pp. 1674-1697 ◽  
Author(s):  
A. L. Goodman ◽  
J. P. Vary ◽  
R. A. Sorensen
Keyword(s):  
Ground State ◽  
Heavy Nuclei ◽  
Ground State Properties ◽  
Realistic Interaction
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