Theoretical calculations of the nuclear deformation effects on α-decay half-lives for heavy and super-heavy nuclei

2021 ◽  
Author(s):  
Shihui Cheng ◽  
Zhishuai Ge ◽  
Ligang Cao ◽  
Feng-Shou Zhang
Keyword(s):  
Theoretical Calculations ◽  
Nuclear Deformation ◽  
Heavy Nuclei ◽  
Α Decay ◽  
Super Heavy Nuclei

scholarly journals Recalculated Viola-Seaborg Coefficients for Partial Alpha Half-lives Based on AME2016

2021 ◽  
Vol 9 (1) ◽  
pp. 37-42
Author(s):  
Lalit Kumar ◽  
Swapna Gora ◽  
Vikram Rana ◽  
Anil Khachi ◽  
O. S. K. S. Sastri
Keyword(s):  
Potential Model ◽  
Heavy Nuclei ◽  
Proximity Potential ◽  
Α Decay ◽  
Theoretical Considerations ◽  
Super Heavy Nuclei

In this paper, the systematics for obtaining the Viola-Seaborg formula (VSF) for logarithmic partial alpha half-lives (Tα1/2) have been undertaken based on the NUBASE2016 evaluation. The constants Az and Bz in Geiger-Nuttal law for determination of Tα1/2  , are obtained using gs-gs transitions data, of even-even nuclei for two sets of nuclei with Z = 84 - 102 and Z = 86 - 98 with N > 126. The Viola-Seaborg co-efficients are determined for both the sets. The obtained parameters for both sets are tested on even-even nuclei for Z ranging from 104 - 118 and it is observed that first set parameters fare better. This formula for estimating α-decay half-lives of heavy nuclei can be extrapolated to predict those of super-heavy nuclei. The logarithmic half-lives Tα1/2 obtained for isotopes of Z = 121 and 122 using current modified VSF (AME2016) are compared with those obtained from theoretical considerations using Coulomb and proximity potential model (CPPM) and observed to be much larger. They are also much larger than those obtained from the previous coefficients based on AME2003 data.

scholarly journals FISSION OF SUPER-HEAVY NUCLEI EXPLORED WITH SKYRME FORCES

2009 ◽  
Vol 18 (04) ◽  
pp. 773-781 ◽  
Author(s):  
N. SCHINDZIELORZ ◽  
J. ERLER ◽  
P. KLÜPFEL ◽  
P.–G. REINHARD ◽  
G. HAGER
Keyword(s):  
Large Scale ◽  
Quantum Corrections ◽  
Heavy Nuclei ◽  
Axially Symmetric ◽  
Α Decay ◽  
Hartree Fock ◽  
Large Scale Survey ◽  
Symmetric Fission ◽  
Super Heavy Nuclei ◽  
Acceptable Agreement

We present a large scale survey of life-times for spontaneous fission in the regime of super-heavy elements (SHE), i.e. nuclei with Z =104-122. This is done on the basis of the Skyrme-Hartree-Fock model. The axially symmetric fission path is computed using a quadrupole constraint. Self-consistent cranking is used for the collective masses and associated quantum corrections. The actual tunneling probability is estimated by the WKB approximation. Three typical Skyrme forces are used to explore the sensitivity of the results. Benchmarks in the regime Z =104-108 show an acceptable agreement. The general systematics reflects nicely the islands of shell stabilization and the crossover from α-decay to fission for the decay chains from the region of Z / N =118/176.

Systematic studies on α-decay half-lives for super heavy nuclei

2010 ◽  
Vol 34 (3) ◽  
pp. 334-339 ◽  
Author(s):  
Zhang Di-Da ◽  
Chen Bao-Qiu ◽  
Ma Zhong-Yu
Keyword(s):  
Heavy Nuclei ◽  
Α Decay ◽  
Super Heavy Nuclei

Formation of α clusters in dilute neutron-rich matter

Science ◽  
2021 ◽  
Vol 371 (6526) ◽  
pp. 260-264 ◽  
Author(s):  
Junki Tanaka ◽  
Zaihong Yang ◽  
Stefan Typel ◽  
Satoshi Adachi ◽  
Shiwei Bai ◽  
...  
Keyword(s):  
Cross Sections ◽  
Cluster Formation ◽  
Reaction Cross ◽  
Skin Thickness ◽  
Neutron Skin ◽  
Heavy Nuclei ◽  
Α Decay ◽  
Neutron Skin Thickness ◽  
Reaction Cross Sections ◽  
Α Particles

The surface of neutron-rich heavy nuclei, with a neutron skin created by excess neutrons, provides an important terrestrial model system to study dilute neutron-rich matter. By using quasi-free α cluster–knockout reactions, we obtained direct experimental evidence for the formation of α clusters at the surface of neutron-rich tin isotopes. The observed monotonous decrease of the reaction cross sections with increasing mass number, in excellent agreement with the theoretical prediction, implies a tight interplay between α-cluster formation and the neutron skin. This result, in turn, calls for a revision of the correlation between the neutron-skin thickness and the density dependence of the symmetry energy, which is essential for understanding neutron stars. Our result also provides a natural explanation for the origin of α particles in α decay.

scholarly journals New insight into α clustering of heavy nuclei via their α decay

2018 ◽  
Vol 777 ◽  
pp. 298-302 ◽  
Author(s):  
Yibin Qian ◽  
Zhongzhou Ren
Keyword(s):  
Heavy Nuclei ◽  
Α Decay ◽  
Insight Into

HALF-LIVES OF CLUSTER RADIOACTIVITY OF HEAVY NUCLEI

2005 ◽  
Vol 19 (15n17) ◽  
pp. 2452-2456
Author(s):  
ZHONGZHOU REN ◽  
CHANG XU
Keyword(s):  
Natural Extension ◽  
Heavy Nuclei ◽  
Α Decay ◽  
Cluster Radioactivity ◽  
New Formula ◽  
Experimental Researches

The half-lives of cluster radioactivity (14C-34Si) are well reproduced by a new formula between half-lives and decay energies. This formula is a natural extension of both the Geiger-Nuttall law and the Viola-Seaborg formula from α-decay to cluster radioactivity. The half-lives of new cluster emitters are predicted based on this formula. These are useful for future experimental researches of cluster radioactivity. The physics related to this formula is analyzed and discussed.

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