中微子质谱用I $_{2}$分子谱率的从头计算
I$_{2}$ molecule for neutrino mass spectroscopy: ab initio calculation of spectral rate
摘要：
最近有人认为，如果原子/分子过程被一种新的相干性所增强，那么原子和分子可能成为确定中微子参数的好靶。本文计算了I-$_2$及其等价分子$|Av \rangle \rightarrow |Xv' \rangle + γ+ ν_iν_j$和$|A'v \rangle \rightarrow |Xv' \rangle + γ+ ν_iν_j$亚稳激发态的相干辐射中微子对发射过程所产生的光子能谱率，其中$γ$是红外光子，$ν_{i(j)}$是$i(j)-$ th中微子质量本征态，并说明了如何确定中微子的基本参数。采用多组态二阶微扰（CASPT 2）方法计算了I $_2$的电子激发态能量，并考虑了自旋轨道耦合的影响。在中间状态的许多振动水平的总和是完全纳入。不同于原子候选人的一个更大的能量差，如氘，我$_2$跃迁从振动能级$A(v=0)$到$X(v' = 24)$给出了一个机会，确定的质量类型（马约拉纳与狄拉克的区别）和马约拉纳CPV（电荷共轭宇称破坏）的阶段，虽然速度小得多。
英文摘要：
It has recently been argued that atoms and molecules may become good targets of determining neutrino parameters still undetermined, if atomic/molecular process is enhanced by a new kind of coherence. We compute photon energy spectrum rate arising from coherent radiative neutrino pair emission processes of metastable excited states of I$_2$ and its iso-valent molecules, $|Av \rangle \rightarrow |Xv' \rangle + γ+ ν_iν_j$ and $|A'v \rangle \rightarrow |Xv' \rangle + γ+ ν_iν_j$ with $γ$ an IR photon and $ν_{i(j)}$ $i(j)-$th neutrino mass eigenstates, and show how fundamental neutrino parameters may be determined. Energies of electronically excited states of I$_2$, including the effect of spin-orbit couplings were calculated by the multiconfigurational second order perturbation (CASPT2) method. Summation over many vibrational levels of intermediate states is fully incorporated. Unlike atomic candidate of a much larger energy difference such as Xe, I$_2$ transitions from a vibrational level $A(v=0)$ to $X(v' = 24)$ give an opportunity of determination of the mass type (Majorana vs Dirac distinction) and determination of Majorana CPV (charge-conjugation parity violating) phases, although the rate is much smaller.
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