论文标题
Theia的抗肿瘤灵敏度
Antineutrino sensitivity at THEIA
论文作者
论文摘要
我们介绍了Theia实验对低能地理和反应器抗肿瘤的敏感性。在这项研究中，我们考虑了可能提出的设计之一，即17.8 ktonne的基准体积TheiA-25探测器，该探测器装有位于Sanford Underground Research Stancity（SURF）的水基液体闪光灯。我们证明了Theia对通过逆-beta衰减相互作用的敏感性在以$ 11.9 \ times10^{32} $ Free Target Protons摄取后，通过反击中衰减相互作用来测量地理和反应堆抗肿瘤的敏感性。检测到的Geo-和反应堆Antineutrinos的预期数为$ 218 \，^{+28} _ { - 20} $和$ 170 \，^{+24} _ { - 20} $。拟合程序的精度分别评估为地理和反应器抗肿瘤的6.72％和8.55％。我们还展示了对安装单个TH和U的敏感性，最佳拟合值的最佳拟合值为$ n_ \ text {th} = 39 \，^{+18} _ { - 15} $和$ n_ \ text {u} = 180 \ \ 180 \，\，^，^{+26} _ { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - { - {-22} $。我们获得$（\ text {th}/\ text {u}）= 4.3 \ pm2.6 $，一年获取数据后，在十年之内，（TH/U）质量比的相对精度将降低至15％。最后，从单个TH和U贡献的拟合结果中，我们将地幔信号评估为$ s_ \ text {mantle} = 9.0 \，\ pm [4.2,4.5] $ niu。假设TH和U之间的全范围正相关（$ρ_C\ in [0，1] $）以及在外壳贡献为8.3％（Th）和7.0％（u）的不确定性。在考虑信号，背景形状和通量上的系统不确定性时，地幔信号变为$ s_ \ text {mantle} = 9.3 \，\ pm [5.2,5.4] $ niu。
We present the sensitivity of the Theia experiment to low-energy geo- and reactor antineutrinos. For this study, we consider one of the possible proposed designs, a 17.8-ktonne fiducial volume Theia-25 detector filled with water-based liquid scintillator placed at Sanford Underground Research Facility (SURF). We demonstrate Theia's sensitivity to measure the geo- and reactor antineutrinos via Inverse-Beta Decay interactions after one year of data taking with $11.9\times10^{32}$ free target protons. The expected number of detected geo- and reactor antineutrinos is $218\,^{+28}_{-20}$ and $170\,^{+24}_{-20}$, respectively. The precision of the fitting procedure has been evaluated to be 6.72% and 8.55% for geo- and reactor antineutrinos, respectively. We also demonstrate the sensitivity towards fitting individual Th and U contributions, with best fit values of $N_\text{Th}=39\,^{+18}_{-15}$ and $N_\text{U}=180\,^{+26}_{-22}$. We obtain $(\text{Th}/\text{U})=4.3\pm2.6$ after one year of data taking, and within ten years, the relative precision of the (Th/U) mass ratio will be reduced to 15%. Finally, from the fit results of individual Th and U contributions, we evaluate the mantle signal to be $S_\text{mantle} = 9.0\,\pm [4.2,4.5]$NIU. This was obtained assuming a full-range positive correlation ($ρ_c\in[0, 1]$) between Th and U, and the projected uncertainties on the crust contributions of 8.3% (Th) and 7.0% (U). When considering systematic uncertainties on the signal and background shape and fluxes, the mantle signal becomes $S_\text{mantle} = 9.3\,\pm [5.2,5.4]$NIU.
