通过420兆电子伏特的（³He，t）反应提取弱跃迁强度。
Extraction of weak transition strengths via the (3He, t) reaction at 420 MeV.
作者信息
Zegers R G T, Adachi T, Akimune H, Austin Sam M, van den Berg A M, Brown B A, Fujita Y, Fujiwara M, Galès S, Guess C J, Harakeh M N, Hashimoto H, Hatanaka K, Hayami R, Hitt G W, Howard M E, Itoh M, Kawabata T, Kawase K, Kinoshita M, Matsubara M, Nakanishi K, Nakayama S, Okumura S, Ohta T, Sakemi Y, Shimbara Y, Shimizu Y, Scholl C, Simenel C, Tameshige Y, Tamii A, Uchida M, Yamagata T, Yosoi M
机构信息
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.
出版信息
Phys Rev Lett. 2007 Nov 16;99(20):202501. doi: 10.1103/PhysRevLett.99.202501. Epub 2007 Nov 15.
Differential cross sections for transitions of known weak strength were measured with the (3He, t) reaction at 420 MeV on targets of 12C, 13C, 18O, 26Mg, 58Ni, 60Ni, 90Zr, 118Sn, 120Sn, and 208Pb. Using these data, it is shown that the proportionalities between strengths and cross sections for this probe follow simple trends as a function of mass number. These trends can be used to confidently determine Gamow-Teller strength distributions in nuclei for which the proportionality cannot be calibrated via beta-decay strengths. Although theoretical calculations in the distorted-wave Born approximation overestimate the data, they allow one to understand the main experimental features and to predict deviations from the simple trends observed in some of the transitions.
利用420兆电子伏特的（3氦，氚）反应，在12碳、13碳、18氧、26镁、58镍、60镍、90锆、118锡、120锡和208铅靶上测量了已知弱强度跃迁的微分截面。利用这些数据表明，该探针的强度与截面之间的比例关系随质量数呈简单趋势。这些趋势可用于可靠地确定那些无法通过β衰变强度校准比例关系的原子核中的伽莫夫-泰勒强度分布。尽管在扭曲波玻恩近似下的理论计算高估了数据，但它们能让人理解主要的实验特征，并预测某些跃迁中观察到的与简单趋势的偏差。
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