AI 中文总结
本研究通过实验与MCNP模拟证实，高能α粒子可通过碰撞级联机制，经D(d,n)³He通道诱导加压氘气发生D-D聚变，含LiD时聚变率更高，模拟与测量结果吻合良好。
AI 中文摘要
我们报道了对诱导氘-氘（D-D）聚变的碰撞级联机制的实验与计算研究。将5毫居里（mCi）的²¹⁰Po α源置于装有加压氘气的腔室内，用两台Mirion SN-S ³He中子探测器对中子发射情况监测18小时，观察到来自暴露于²¹⁰Po源发射的高能α粒子的加压氘靶的中子产生证据。扣除本底后，入射到加压氘气中的α粒子产生的平均超额中子数约为74个，对应聚变中子率约为2.24 n/s；若加压氘气中含有LiD，平均超额中子数增至268个，对应8.1 n/s。由于D-D聚变分为两个概率相等的分支，这些数值分别对应每秒近4.5次和16.2次聚变。结合实验几何、源活度及探测器配置的MCNP模拟预测的中子产额与测量值偏差在5.4%以内，且在实验不确定度范围内复现了探测器响应。测量与模拟中子计数的紧密一致性表明，氘内的高能α粒子相互作用可能通过D(d,n)³He通道促成可测量的D-D聚变反应。
英文摘要
We report experimental and computational investigations of a collision-cascade mechanism to induce deuterium-deuterium (D-D) fusion. Evidence of neutron production was observed from a pressurized deuterium target exposed to energetic alpha particles emitted by a $^{210}\text{Po}$ source. A 5-mCi $^{210}\text{Po}$ alpha source was placed within a chamber containing pressurized deuterium gas, and neutron emission was monitored for 18 h using two Mirion SN-S $^{3}\text{He}$ neutron detectors. Alpha particles incident on pressurized deuterium gas produced an average excess of $\sim$74 neutrons after background subtraction, corresponding to a fusion neutron rate of $\sim$2.24 n/s. With LiD in the pressurized deuterium, the average excess increased to 268 neutrons, corresponding to 8.1 n/s. Since D-D fusion branches into two equally likely pathways, these correspond to a fusion rate near 4.5 and 16.2 fusions per second, respectively. MCNP simulations incorporating experimental geometry, source activity, and detector configuration predicted neutron yields within 5.4% of the measured values and reproduced the detector response within experimental uncertainty. The tight agreement between measured and simulated neutron counts suggests that energetic alpha-particle interactions within the deuterium may contribute to measurable D-D fusion reactions through the D(d,n)$^{3}\text{He}$ channel.
Comments10 pages, 4 figures
