Low-energy solar neutrino detection utilizing advanced germanium detectors
Low-energy solar neutrino detection utilizing advanced germanium detectors
复制标题
利用先进的锗探测器进行低能太阳中微子探测
DOI：
10.1088/1361-6471/acc751
复制
发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Raut, M S
中科院分区：
文献类型：
--
作者：
Bhattarai, S;Mei, D-M;Raut, M S
我们探讨了利用先进的锗探测器作为低能太阳中微子观测站的可能性。利用杂质电离产生的载流子进行内电荷放大的Ge探测器是一种具有实验灵敏度的探测低能太阳中微子的新技术。Ge内部电荷放大（GeICA）探测器通过声子发射，将中微子与Ge原子相互作用产生的载流子放大。正是这些声子将通过杂质的电离产生电荷载流子，以实现10.01 eV的极低能量阈值。我们演示了杂质能级为3× 10 10 cm− 3、9× 10 10 cm− 3和2× 10 11 cm− 3的Ge探测器中杂质的声子吸收、激发和电离几率。我们提出的灵敏度，这样的Ge实验检测太阳中微子在低能区。我们表明，如果GeICA技术变得可用，那么一个新的机会出现，观察pp和7 Be太阳中微子。这样一个仅用1kg高纯Ge的新型探测器，在探测能量阈值为0.01eV的情况下，对pp中微子和7Be中微子的探测分别为每年10和15个事件。
We explore the possibility to use advanced germanium (Ge) detectors as a low-energy solar neutrino observatory by means of neutrino-nucleus elastic scattering. A Ge detector utilizing internal charge amplification for the charge carriers created by the ionization of impurities is a novel technology with experimental sensitivity for detecting low-energy solar neutrinos. Ge internal charge amplification (GeICA) detectors will amplify the charge carriers induced by neutrino interacting with Ge atoms through the emission of phonons. It is those phonons that will create charge carriers through the ionization of impurities to achieve an extremely low energy threshold of∼ 0.01 eV. We demonstrate the phonon absorption, excitation, and ionization probability of impurities in a Ge detector with impurity levels of 3× 10 10 cm− 3, 9× 10 10 cm− 3, and 2× 10 11 cm− 3. We present the sensitivity of such a Ge experiment for detecting solar neutrinos in the low-energy region. We show that, if GeICA technology becomes available, then a new opportunity arises to observe pp and 7 Be solar neutrinos. Such a novel detector with only 1 kg of high-purity Ge will give∼ 10 events per year for pp neutrinos and∼ 5 events per year for 7 Be neutrinos with a detection energy threshold of 0.01 eV.