The 2νβ−β− decay rates within Pyatov's restoration method

2017 ◽  
Vol 957 ◽  
pp. 491-512 ◽  
Author(s):  
Serdar Ünlü ◽  
Neçla Çakmak ◽  
Cevad Selam
Keyword(s):  
Decay Rates ◽  
Β Decay ◽  
Restoration Method

Beta-decay half-lives of the extremely neutron-rich nuclei in the closed-shell N = 50, 82, 126 groups

2021 ◽  
Author(s):  
Nguyen Kim Uyen ◽  
Kyung Yuk Chae ◽  
NgocDuy Nguyen ◽  
DuyLy Nguyen
Keyword(s):  
Half Life ◽  
Random Phase ◽  
Closed Shell ◽  
Decay Rates ◽  
Magic Numbers ◽  
Β Decay ◽  
R Process ◽  
Neutron Rich Isotopes ◽  
Semi Empirical ◽  
The Impact

Abstract The β--decay half-lives of extremely neutron-rich nuclei are important for understanding nucleosynthesis in the r-process. However, most of their half-lives are unknown or very uncertain, leading to the need for reliable calculations. In this study, we updated the coefficients in recent semi-empirical formulae using the newly updated mass (AME2020) and half-life (NUBASE2020) databases to improve the accuracy of the half-life prediction. In particular, we developed a new empirical model for better calculations of the β--decay half-lives of isotopes ranging in Z = 10 – 80 and N = 15-130. We examined the β--decay half-lives of the extremely neutron-rich isotopes at and around the neutron magic numbers of N = 50, 82, and 126 using either five different semi-empirical models or finite-range droplet model and quasi-particle random phase approximation (FRDM+QRPA) method. The β--decay rates derived from the estimated half-lives were used in calculations to evaluate the impact of the half-life uncertainties of the investigated nuclei on the abundance of the r-process. The results show that the half-lives mostly range in 0.001 < T1/2 < 100 s for the nuclei with a ratio of N/Z < 1.9; however, they differ significantly for those with the ratio of N/Z > 1.9. The half-life differences among the models were found to range from a few factors (for N/Z < 1.9 nuclei) to four orders of magnitude (for N/Z > 1.9). These discrepancies lead to a large uncertainty, which is up to four orders of magnitude, in the r-process abundance of isotopes. We also found that the multiple-reflection time-of-flight (MR-TOF) technique is preferable for precise mass measurements because its measuring timescale applies to the half-lives of the investigated nuclei. Finally, the results of this study are useful for studies on the β-decay of unstable isotopes and astrophysical simulations.

scholarly journals Two-phonon structures for beta-decay theory

2018 ◽  
Vol 194 ◽  
pp. 02008
Author(s):  
A.P. Severyukhin ◽  
N.N. Arsenyev ◽  
I.N. Borzov ◽  
R.G. Nazmitdinov ◽  
S. Åberg
Keyword(s):  
Random Matrix ◽  
Single Particle ◽  
Ground State ◽  
Matrix Theory ◽  
Decay Rates ◽  
Total Probability ◽  
Phonon Coupling ◽  
Skyrme Interaction ◽  
Β Decay ◽  
Gamow Teller

The β-decay rates of 60Ca have been studied within a microscopic model, which is based on the Skyrme interaction T45 to construct single-particle and phonon spaces. We observe a redistribution of the Gamow–Teller strength due to the phonon-phonon coupling, considered in the model. For 60Sc, the spin-parity of the ground state is found to be 1+. We predict that the half-life of 60Ca is 0.3 ms, while the total probability of the βxn emission is 6:1%. Additionally, the random matrix theory has been applied to analyze the statistical properties of the 1+ spectrum populated in the β-decay to elucidate the obtained results.

scholarly journals Discrepancy between experimental and theoretical β-decay rates resolved from first principles

2019 ◽  
Vol 15 (5) ◽  
pp. 428-431 ◽  
Author(s):  
P. Gysbers ◽  
G. Hagen ◽  
J. D. Holt ◽  
G. R. Jansen ◽  
T. D. Morris ◽  
...  
Keyword(s):  
First Principles ◽  
Decay Rates ◽  
Β Decay

Effects of Antineutrino mass on β−-Decay Rates Calculated Within the Gross Theory of Beta Decay

2019 ◽  
Vol 50 (1) ◽  
pp. 57-63 ◽  
Author(s):  
M. R. Azevedo ◽  
R. C. Ferreira ◽  
A. J. Dimarco ◽  
C. A. Barbero ◽  
A. R. Samana ◽  
...  
Keyword(s):  
Beta Decay ◽  
Decay Rates ◽  
Β Decay

scholarly journals The PANDORA project: an experimental setup for measuring in-plasma β-decays of astrophysical interest

2020 ◽  
Vol 227 ◽  
pp. 01013
Author(s):  
David Mascali ◽  
Maurizio Busso ◽  
Alberto Mengoni ◽  
Simone Amaducci ◽  
Castro Giuseppe ◽  
...  
Keyword(s):  
Nuclear Astrophysics ◽  
Charge State Distribution ◽  
Decay Rates ◽  
Nuclear Decay ◽  
Early Solar System ◽  
State Distribution ◽  
Β Decay ◽  
Plasma Trap ◽  
First Time ◽  
Magnetic Plasma

Experiments performed on Storage Rings have shown that lifetimes of beta-radionuclides can change dramatically as a function of theionization state. PANDORA (Plasmas for Astrophysics, Nuclear Decay Observation and Radiation for Archaeometry) aims at measuring, for the first time, nuclear β-decay rates in stellar-like conditions, especially for radionuclides involved in nuclear-astrophysics processes (BBN, s- processing, CosmoChronometers, Early Solar System formation). Compact magnetic plasma traps, where plasmas reach density ne~10n-1014 cm-3, and temperature Te~0.1-30 keV, are suitable for such studies. The decay rates can be measured as a function of the charge state distribution of the inplasma ions. The collaboration is now designing the plasma trap able to reach the needed plasma densities, temperatures and charge states distributions. A first list of radioisotopes, including tens of physics cases of potential interest is now available. Possible physics cases include, among the others, 2°4Tl, 63Ni, 6°Co, 171Tm, 147Pm, 85Kr, 176Lu and the pairs 187Re-187Os and 87Sr-87Rb, which play a crucial role as cosmo-clock. Physics cases are now under evaluation in terms of lifetime measurements feasibility in a plasma trap.

scholarly journals Effective stellar β -decay rates of nuclei with long-lived isomers: Al26 and Cl34

2018 ◽  
Vol 97 (6) ◽  
Author(s):  
Projjwal Banerjee ◽  
G. Wendell Misch ◽  
Surja K. Ghorui ◽  
Yang Sun
Keyword(s):  
Decay Rates ◽  
Β Decay
Sign in / Sign up

Export Citation Format

Share Document