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原子核质量公式的分项检验

A CHECK ON INDIVIDUAL TERMS OF THE NUCLEAR MASS FORMULA

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【作者】 曾谨言林纯镇杨福家

【Author】 ZENG JIN-YAN (C. Y. TSENG) LIN CHUN-ZHEN (Peking University) YANG FU-JIA (F. C. YANG) (Fudan University )

【机构】 北京大学北京大学复旦大学

【摘要】 本文提出了对原子核质量公式进行分项检验的概念,并从同位旋多重态的质量关系、同位旋相似态的库仑能差、β稳定线位置、远离β稳定线的核质量以及原子核可裂变度等方面对常见的几个质量公式进行分项检验。分析了它们的成功之处以及与实验的矛盾,为进一步改进质量公式提供了一些根据。

【Abstract】 The usual way to check whether a nuclear mass formula is good or not is to compare the calculated mass with experimental value. In this paper some concepts are summaried which check one or two terms in the mass formula separately: (ⅰ) P/P ratio-pairing energy; (ⅱ) Janecke ratio-symmetry energy; (ⅲ) A-dependence of giant resonance energy-symmetry energy; (ⅳ) IMME (isobaric multiplets mass equation)-Coulomb energy; (ⅴ) Difference of Coulomb energies-Coulomb energy; (ⅵ) β-stability lineCoulomb energy and symmetry energy; (ⅶ) Fissibility-Coulomb energy and surface energy. The following nuclear mass formulae are compared with each other: (A) Revised Weizsacker formula; (B) Danos-Gillet formula; (C) Myers-Swiatecki formula; (D) our formula. The main results are the following: (ⅰ) P/P’=1 for (A), (B) or (C);=3/4 for (D), which is in agreement with the experiment. (ⅱ) From the Janecke ratio, the form T(T+1) for the symmetry energy is better than T(T+4) or T2. (ⅲ) By the symmetry term T2/Aa, with a=0.90, the A-depeneence of giant resonance can be explained extremely well. (ⅳ) IMME, M(A, Tz)=a+bTz2+cTz2+dT z3. Only for (D), d≠0. (ⅴ) △Eo=Eo (Z+I)—Ec (Z), For (A) and (B), △EcA1/3/(Z+(1/2))=const.; for (C), △EcA1/3/(Z+(1/2)) (1—1.689)/A2/3=const.; for (D), △Ec Z2/3=const., which is in good agreement with the experiment. (ⅵ) For the β-stability line, if we compare the calculated ZA with the experimental value ZA and calculate the root mean square devidtions, then for (A), RMS=0.450; (B)=0.589; (C)=0.438; (D)=0.429.

  • 【文献出处】 高能物理与核物理 ,High Energy Physics and Unclear Physics , 编辑部邮箱 ,1981年02期
  • 【被引频次】2
  • 【下载频次】78
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