The (Li6,Li*6[3.56MeV]) reaction at 100 MeV/u as a probe of Gamow-Teller transition strengths in the inelastic scattering channel
The (Li6,Li*6[3.56MeV]) reaction at 100 MeV/u as a probe of Gamow-Teller transition strengths in the inelastic scattering channel
复制标题
100 MeV/u 下的 (Li6,Li*6[3.56MeV]) 反应作为非弹性散射通道中 Gamow-Teller 跃迁强度的探针
DOI：
10.1103/physrevc.98.015804
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发表时间：
2018
影响因子：
3.1
通讯作者：
Kobayashi N. et al.
中科院分区：
文献类型：
--
作者：
Sullivan C.;Kobayashi N. et al.
背景：非弹性中微子核散射对于理解核心坍缩超新星和在地面探测器中探测此类事件发射的中微子是重要的。直接测量截面是困难的，只在少数核上进行过。因此，重要的是发展间接技术，从中可以确定非弹性中微子核散射截面。目的：本文介绍了100 MeV/u反应的发展，作为分离非弹性通道中等矢量自旋转移响应的探针，从中可以提取与非弹性中微子核散射截面相关的原子核的伽莫夫-泰勒跃迁强度。方法：通过在磁谱仪中测量弹射量，并选择检测到状态衰变产生的3.56 MeVray的事件，获得了等矢量自旋转移选择性。高纯度锗三叶草检测器用于检测疗法。采用多普勒重建法测定静帧能量。由和3.56 mev动量矢量确定了残核的激发能。结果：在反应研究中，成功地测量了非弹性通道中的等矢量自旋转移激发能谱。在15.1 MeV下观察到强Gamow-Teller态。通过与模拟实验的比较，验证了提取伽莫夫-泰勒强度的方法。在反应的测量中，3.56 MeVpeak不能从等标量激发衰减的强背景中分离出来。本文认为，通过使用a射线跟踪阵列代替三叶草阵列，可以将反应用于提取等矢量自旋传递响应的质量范围扩大到质量数为或更高。结论：反应探针可以用来分离原子核中的非弹性等矢量自旋转移反应。然而，应用于质量数约为25或更多的原子核，将需要更高效的射线阵列和更好的跟踪能力。
Background:Inelastic neutrino-nucleus scattering is important for understanding core-collapse supernovae and the detection of emitted neutrinos from such events in earth-based detectors. Direct measurement of the cross sections is difficult and has only been performed on a few nuclei. It is, therefore, important to develop indirect techniques from which the inelastic neutrino-nucleus scattering cross sections can be determined.Purpose:This paper presents a development of thereaction at 100 MeV/u as a probe for isolating the isovector spin-transfer response in the inelastic channelfrom which the Gamow-Teller transition strengths from nuclei of relevance for inelastic neutrino-nucleus scattering cross sections can be extracted.Method:By measuring theejectile in a magnetic spectrometer and selecting events in which the 3.56 MeVray from the decay of thestate is detected, the isovector spin-transfer selectivity is obtained. High-purity germanium clover detectors served to detect therays. Doppler reconstruction was used to determine theenergy in the rest frame of. From theand 3.56 MeV-momentum vectors the excitation energy of the residual nucleus was determined.Results:In the study of thereaction, the isovector spin-transfer excitation-energy spectrum in the inelastic channel was successfully measured. The strong Gamow-Teller state inat 15.1 MeV was observed. Comparisons with the analogreaction validate the method of extracting the Gamow-Teller strength. In measurements of thereactions, the 3.56 MeVpeak could not be isolated from the strong background in thespectrum from the decay of the isoscalar excitations. It is argued that by using a-ray tracking array instead of a clover array, it is feasible to extend the mass range over which thereaction can be used for extracting the isovector spin-transfer response up to mass numbers ofand perhaps higher.Conclusions:It is demonstrated that thereaction probe can be used to isolate the inelastic isovector spin-transfer response in nuclei. Application to nuclei with mass numbers of about 25 or more, however, will require a more efficient-ray array with a better tracking capability.