Establishment of Neutron Shell Effects in (n,2n) Cross-Sections at 14 MeV

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概要

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• The existence of shell effects in (n, 2n) cross-sections at 14 MeV neutron energy has been controversial for more than a decade. In the present work, recently abailable systematised dat on (n, 2n) cross-sections at 14.7 MeV has been reinvestigated critically in the vicinity of closed shells. These plots of σ(n, 2n) versus N and (N-Z)/A show definite shell effects at N=20,28 and 50 which have never been revealed so distinctly by earlier investigations. The disappearance of shell effect in heavy nuclei N=82 has been explained. It has been demonstrated that shell closure effect is perceptible clearly only in comparison to neighbouring nuclei of same N-Z and pairing effects. The distinct sharp rise of σ(n, 2n) with (N-Z)/A>∼0.1, has been noted to be a characteristic of closed shell or sub-shell isotones only. An empirical relation for σ(n, 2n) is devised, for A≧110.

• 社団法人日本物理学会の論文
• 1975-11-15

著者

• Gupta S.

  Shri Krishana Ayurvedic College

• MOHINDRA R.

  Department, Kurukshetra University

• Mohindra R.k.

  Department Of Radiology Medical College: Department Of Physics B. N. C. University

• Mohindra R.

  Department Kurukshetra University

• Gupta S.K.

  Shri Krishana Ayurvedic College

関連論文

• Establishment of Neutron Shell Effects in (n,2n) Cross-Sections at 14 MeV
• Estimated Radiation Dose vla ^Fe in Man for 14 MeV Neutrons

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