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C12(d,p)C13和Ca40(d,p)Ca41基态反应质子极化的研究

姜承烈 余泮水 谢滋 毛振麟 程业浩 梁文学 王震遐 郑万辉 赵忠尧

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C12(d,p)C13和Ca40(d,p)Ca41基态反应质子极化的研究

姜承烈, 余泮水, 谢滋, 毛振麟, 程业浩, 梁文学, 王震遐, 郑万辉, 赵忠尧

POLARIZATION OF PROTONS FROM THE C12(d,p)C13 AND Ca40(d,p)Ca41 GROUND STATE REACTIONS

CHIANG CHENG-LIEH, YU PAN-SHUI, HSIEH TZO, MAO CHEN-LIN, CHEN YEH-HAO, LIANG WEN-HSUEH, WANG CHEN-HSIA, CHENG WAN-HUI, CHAO CHUNG-YAO
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  • 本实验测量了C12(d,p)C13和Ca40(d,p)Ca41两个基态反应质子群在六个角度上的极化值。在C12的反应中,小角区的结果和前人的工作相近,和半经典符号规则jn=ln±1/2,P=(±)一致。θL=115°的数据是前人没有测量过的,我们得到P=0.529±0.068,在Ca40的反应中,小角区数据的符号也和半经典符号规则一致,和Немeц及Boschitz的实验结果相同,而和Hird,Takeda及Bercaw的实验结果相反,看来这是由于入射能量不一样所致。因为在这些实验中,三个较高入射能量和三个较低入射能量的结果,都分别有一致的符号,把已发表的极化实验数据进行比较,可以看出,半经典符号规则还是有一定的参考价值,或者,可能找出一个修改后的符号规律,以供核能谱学应用。在有些情况下,我们看到,随着氘核能量的增加,极化角分布的图形似乎有向小角区移动的趋势,这可能是直接反应的一个特性。关于截面和极化角分布间的位置对应关系,我们认为,截面角分布的极小,除了可对应于极化的变号以外,还可能对应于极化绝对值的极大,截面角分布的极大也可能对应于极化的变号,对于这些现象,我们用粗糙的扭曲波理论进行了讨论。
    The polarization of protons emitted at six angles from the C12(d,p)C13 and Ca40(d,p)Ca41 ground state reactions has been measured. For the C12 reaction, the data at small angles are very close to the results of previous works, and in agreement with thesemiclassical sign rule jn=ln±1/2,P=(±). The value at θ= 115° has not been mea-sured before, we obtained P = 0.529± 0.068 at this angle. For the Ca40 reaction, the sign of polarization which we found in the region of small angles is also in agreement with the semiclassical sign rule, and is the same as those found in the work of Nemetz and of Boschitz, but is opposite to those obtained by Takeda and Bercaw. This difference may be due to the difference in the deuteron energy used, since in these experiments, the three with higher deuteron energies all gave the same positive sign of polarization while the three with lower deuteron energies all gave the same negative sign. After a survey of the polarization data now available we found that the semiclassical sign rule is still true to a certain degree, and that it may be possible to find out a modified sign rule for the use in the nuclear spectroscopy. In some cases, we found that the pattern of the polarization angular distribution is shifted towards small angles as the deuteron energy is increased, and this may be a characteristic of direct reactions. For the correspondence between the cross-section angular distribution and polarization angular distribution, we found that the position of a minimum in the cross-section curve may correspond to the position of a change in sign or of a maximum absolute value in the polarization curve, and that the position of a maximum in the cross-section curve may also correspond to the position of a change in sign in the polarization curve. We discuss these phenomena by using the distored wave theory.
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出版历程
  • 收稿日期:  1965-09-23
  • 刊出日期:  2005-08-05

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