富质子核23 Al和31 Cl的β延迟质子衰变和经典新星中的爆炸性氢燃烧
Beta-delayed proton decay of proton-rich nuclei 23Al and 31Cl and explosive H-burning in classical novae
摘要：
我们发展了一种测量丰质子核β延迟质子衰变的技术，该技术是用得克萨斯A&M大学的MARS反冲谱仪产生和分离的。短寿命的放射性物质在飞行中产生，分离，然后减速（从大约40 MeV/u）并植入非常薄的Si探测器中间。该光束是脉冲的，并且在光束脉冲之间测量光束中收集的纯源的β-p衰减。离子注入避免了探测器窗口的问题，使我们能够测量能量低至200 keV的质子，从原子核的寿命为100 ms或less. Use这种技术，我们已经研究了同位素23 Al和31 Cl，这两个重要的理解爆炸H-燃烧在新星。它们分别产生于反应24 Mg（p，2n）23 Al和32 S（p，2n）31 Cl中，在逆运动学中，分别来自48和40 MeV/u的稳定束。我们详细介绍了该技术，其性能和23 Al和31 Cl β-p衰变的结果。该技术已经显示出对β延迟带电粒子发射的显著选择性，并且即使在几个pps的放射性核束速率下也能工作。填充的状态分别是辐射质子捕获反应22 Na（p，g）23 Mg和30 P（p，g）31 S的共振。
英文摘要：
We have developed a technique to measure beta-delayed proton decay of proton-rich nuclei produced and separated with the MARS recoil spectrometer of Texas A&M University. The short-lived radioactive species are produced in-flight, separated, then slowed down (from about 40 MeV/u) and implanted in the middle of very thin Si detectors. The beam is pulsed and beta-p decay of the pure sources collected in beam is measured between beam pulses. Implantation avoids the problems with detector windows and allows us to measure protons with energies as low as 200 keV from nuclei with lifetimes of 100 ms or less. Using this technique, we have studied the isotopes 23Al and 31Cl, both important for understanding explosive H-burning in novae. They were produced in the reactions 24Mg(p,2n)23Al and 32S(p,2n)31Cl, respectively, in inverse kinematics, from stable beams at 48 and 40 MeV/u, respectively. We give details about the technique, its performances and the results for 23Al and 31Cl beta-p decay. The technique has shown a remarkable selectivity to beta-delayed charged-particle emission and would work even at radioactive beam rates of a few pps. The states populated are resonances for the radiative proton capture reactions 22Na(p,g)23Mg and 30P(p,g)31S, respectively.
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