Stellar electron-capture rates based on finite-temperature relativistic quasiparticle random-phase approximation

Ravlic A.; Yuksel E.; Niu Y. F.; Colo G.; Khan E.; Paar N.

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Stellar electron-capture rates based on finite-temperature relativistic quasiparticle random-phase approximation

机译：基于有限温度相对论Quasiparticle随机相近似的恒星电子捕获速率

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The electron-capture process plays an important role in the evolution of the core collapse of a massive star that precedes the supernova explosion. In this study, the electron capture on nuclei in stellar environment is described in the relativistic energy density functional framework, including both the finite-temperature and nuclear pairing effects. Relevant nuclear transitions J(pi) = 0(+/-), 1(+/-) , 2(+/- )are calculated using the finite-temperature proton-neutron quasiparticle random-phase approximation with the density-dependent meson-exchange effective interaction DD-ME2. The pairing and temperature effects are investigated in the Gamow-Teller transition strength as well as the electron-capture cross sections and rates for Ti-44 and Fe-56 in the stellar environment. It is found that the pairing correlations establish an additional unblocking mechanism similar to the finite-temperature effects, that can allow otherwise blocked single-particle transitions. Inclusion of pairing correlations at finite temperature can significantly alter the electron-capture cross sections, even up to a factor of 2 for Ti-44, while for the same nucleus electron-capture rates can increase by more than one order of magnitude. We conclude that for the complete description of electron capture on nuclei both pairing and temperature effects must be taken into account.

机译：电子俘获过程在超新星爆发前大质量恒星的核心坍缩演化中起着重要作用。在这项研究中，在相对论能量密度泛函框架中描述了恒星环境中原子核上的电子俘获，包括有限温度和核配对效应。利用有限温度质子-中子准粒子随机相位近似和密度相关介子交换有效相互作用DD-ME2，计算了相关的核跃迁J（pi）=0（+/-）、1（+/-）、2（+/-）。在伽莫-特勒跃迁强度以及恒星环境中Ti-44和Fe-56的电子俘获截面和速率中研究了配对效应和温度效应。研究发现，配对关联建立了一种额外的解锁机制，类似于有限温度效应，可以允许以其他方式阻止单粒子跃迁。在有限温度下加入配对关联可以显著改变电子俘获截面，对于Ti-44甚至可以达到2倍，而对于相同的核，电子俘获率可以增加一个数量级以上。我们的结论是，为了完整地描述电子在原子核上的俘获，必须考虑配对效应和温度效应。

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《Physical review, C》 |2020年第6期|共15页
作者
Ravlic A.; Yuksel E.; Niu Y. F.; Colo G.; Khan E.; Paar N.;
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Univ Zagreb Fac Sci Dept Phys Bijenicka C 32 Zagreb 10000 Croatia;

Yildiz Tech Univ Fac Arts &

Sci Dept Phys Davutpasa Campus TR-34220 Esenler Turkey;

Lanzhou Univ Sch Nucl Sci &

Technol Lanzhou Peoples R China;

Univ Milan Dipartimento Fis Milan Italy;

Univ Paris Saclay Univ Paris Sud Inst Phys Nucl IN2P3 CNRS F-91406 Orsay France;

Univ Zagreb Fac Sci Dept Phys Bijenicka C 32 Zagreb 10000 Croatia;

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正文语种 eng
中图分类原子核物理学、高能物理学;
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机译：质子-中子准粒子随机相近似计算的恒星环境中sd-壳核的弱相互作用速率
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Stellar electron-capture rates based on finite-temperature relativistic quasiparticle random-phase approximation

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