Doubly Radiative np Capture

Ronald J. Adler
Phys. Rev. C 6, 1964 – Published 1 December 1972
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Abstract

We have calculated the cross section for n+pd+2γ. This process depends critically on the same matrix element that gives the amplitude for singly radiative np capture from the continuum S3 state. It has been suggested that "anomalous" transitions from this continuum S3 state may explain a long-standing discrepancy in np capture (σexp=334.2±0.5 mb and σth=309.5±5 mb) by contributing roughly 8% to the total np capture cross section. If this speculation is correct then the branching ratio of doubly to singly radiative np capture is 1.4×104. On the other hand a conventional estimate of this amplitude yields a branching ratio of about 3.4×1010. An experimental measurement of the doubly radiative cross section in the 10-μb region should therefore settle the question of the importance of the S3 initial state in the total radiative np capture cross section. Such a measurement seems at present to be much easier than similarly motivated polarization measurements.

  • Received 24 April 1972

DOI:https://doi.org/10.1103/PhysRevC.6.1964

©1972 American Physical Society

Authors & Affiliations

Ronald J. Adler

  • The American University, Washington, D. C. 20016,
  • Stanford Linear Accelerator Center, Stanford University, Stanford, California 94305

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Issue

Vol. 6, Iss. 6 — December 1972

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