论文标题
$β$ -DECAY半衰期的演变有限植物
Evolution of $β$-decay half-lives at finite-temperatures
论文作者
论文摘要
通过改变温度和密度，与恒星进化的最终阶段相关的条件，研究了核核能密度功能框架中核的$β$ - 定位性能。在核性质的描述以及有限的温度质子 - 中子相对论准粒子随机相近似（FT-PNRQRPA）中，都考虑了热和核配对效应，以计算$β$ -Decay中相关的允许和先进的过渡。在温度之间的$β$ -DECAY半衰期上研究了温度和密度效应，$ t = 0-1.5 $ MEV，在密度下，$ρy_e= 10^7 $ g/cm $ {}^3 $和$ 10^9 $ g/cm $ $ $ {}}^3 $。还研究了有限温度下的Ti，Fe，CD和SN同位素链的相关Gamow-Teller转变。我们发现，随着密度$ρy_e$的增加，$β$ decay的半衰期增加，而半衰期通常随温度升高而降低。结果表明，温度效应在零温度下更长的半衰期在核中大大降低了半衰期，而仅获得短半衰期的核的略有变化。我们还表明，在有限温度下的$β$ decay半衰期计算中，将退出转变包括在内的重要性。将FT-PNQRPA结果与$ PF- $ shell Nuclei的壳型计算进行比较，对于$β$ - 订单率的温度依赖性，获得了合理的一致性。最后，在温度下进行$β$ -decay半衰期的大规模计算，$ t_9（\ text {k}）= 5 $和$ t_9（\ text {k}）= 10 $ and密度$ρy_e= 10^7 $ g/cm $ $ $ $ $ {} $ 10 $ g/cfen $ g/cf for和$ 10 $ g/cm} $ 8 \ LEQ Z \ LEQ 82 $，与天体物理核合成机理有关。
$β$-decay properties of nuclei are investigated within the relativistic nuclear energy density functional framework by varying the temperature and density, conditions relevant to the final stages of stellar evolution. Both thermal and nuclear pairing effects are taken into account in the description of nuclear properties and in the finite temperature proton-neutron relativistic quasiparticle random-phase approximation (FT-PNRQRPA) to calculate the relevant allowed and first-forbidden transitions in the $β$-decay. The temperature and density effects are studied on the $β$-decay half-lives between temperatures $T = 0-1.5$ MeV, and at densities $ρY_e = 10^7$ g/cm${}^3$ and $10^9$ g/cm${}^3$. The relevant Gamow-Teller transitions are also investigated for Ti, Fe, Cd, and Sn isotopic chains at finite temperatures. We find that the $β$-decay half-lives increase with increasing density $ρY_e$, whereas half-lives generally decrease with increasing temperature. It is shown that the temperature effects decrease the half-lives considerably in nuclei with longer half-lives at zero temperature, while only slight changes for nuclei with short half-lives are obtained. We also show the importance of including the de-excitation transitions in the calculation of the $β$-decay half-lives at finite temperatures. Comparing the FT-PNQRPA results with the shell-model calculations for $pf-$shell nuclei, a reasonable agreement is obtained for the temperature dependence of $β$-decay rates. Finally, large-scale calculations of $β$-decay half-lives are performed at temperatures $T_9(\text{K}) = 5$ and $T_9(\text{K}) = 10$ and densities $ρY_e = 10^7$ g/cm${}^3$ and $10^9$ g/cm${}^3$ for even-even nuclei in the range $8 \leq Z \leq 82$, relevant for astrophysical nucleosynthesis mechanisms.
