The beta-Oslo method: experimentally constrained ($n,γ$) reaction rates relevant to the $r$-process

Experimentally constrained $^{165,166}\text{Ho}(n,γ)$ rates and implications for the $s$ process

The $γ$-ray strength function and the nuclear level density of $^{167}$Ho have been extracted using the Oslo method from a $^{164}\text{Dy}(α,pγ)^{167}$Ho experiment carried out at the Oslo Cyclotron Laboratory. The level density displays a shape that is compatible with %can be approximated with the constant temperature model in the quasicontinuum, while the strength function shows structures indicating the presence of both a scissors and a pygmy dipole resonance. Using our present results as well as data from a previous $^{163}\text{Dy}(α,pγ)^{166}$Ho experiment, the $^{165}\text{Ho}(n,γ)$ an…

Experimentally constrained ($p,γ$)$^{89}$Y and ($n,γ$)$^{89}$Y reaction rates relevant to the $p$-process nucleosynthesis

The nuclear level density and the $γ$-ray strength function have been extracted for $^{89}$Y, using the Oslo Method on $^{89}$Y($p,p' γ$)$^{89}$Y coincidence data. The $γ$-ray strength function displays a low-energy enhancement consistent with previous observations in this mass region ($^{93-98}$Mo). Shell-model calculations give support that the observed enhancement is due to strong, low-energy $M1$ transitions at high excitation energies. The data were further used as input for calculations of the $^{88}$Sr($p,γ$)$^{89}$Y and $^{88}$Y($n,γ$)$^{89}$Y cross sections with the TALYS reaction cod…

Neutron Beta-Decay as Laboratory for Test of Standard Model

We analyse the sensitivity of all experimentally observable asymmetries and energy distributions for the neutron beta-decay with a polarised neutron and unpolarised decay proton and electron and the lifetime of the neutron to contributions of order 10^(-4) of interactions beyond the Standard model (SM).

基于初值计算的N=50中子富集核素β衰变半衰期

Ab initio calculations of beta-decay half-lives for $N=50$ neutron-rich nuclei

本文基于初值计算方法，首次对N=50中子富集核素的β衰变半衰期进行计算，通过介子相似重整化群方法推导了价空间哈密顿量和弱相互作用算符，验证了该方法的预测能力。

Spin dipole nuclear matrix elements for double beta decay nuclei by charge-exchange reactions

Spin dipole (SD) strengths for double beta-decay (DBD) nuclei were studied experimentally for the first time by using measured cross sections of (3He,t) charge exchange reactions (CERs). Then SD nuclear matrix elements (NMEs) for low-lying 2- states were derived from the experimental SD strengths by referring to the experimental GT (Gamow-Teller) and F (Fermi) strengths. They are consistent with the empirical SD NMEs based on the quasi-particle model with the empirical effective SD coupling constant. The CERs are used to evaluate the SD NME, which is associated with one of the major components…

中心力和张量力相互作用下的电荷交换反应与双贝塔衰变中微子及天体物理中微子相关的核矩阵元

Charge exchange reactions with central and tensor interactions and nuclear matrix elements associated with double-beta-decay neutrinos and astro neutrinos

本文首次提出通过电荷交换反应截面的动量转移依赖性，同时考虑中心力和张量力，实验提取双贝塔衰变和逆贝塔衰变相关的伽莫夫-泰勒及张量核矩阵元，并应用于71Ga、100Mo和128Te靶核。