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More than 50 years ago, in 1934, Chadwick and Goldhaber (ChG 34)
published a paper entitled "A 'Nuclear Photo-effect' Disintegration
of the Diplon by -y-Rays."l in the introduction: They noted "By
analogy with the excitation and ionisation of atoms by light, one
might expect that any complex nucleus should be excited or
'ionised', that is, disintegrated, by -y-rays of suitable energy,"
and furthermore: "Heavy hydrogen was chosen as the element first to
be examined, because the diplon has a small mass defect and also
because it is the simplest of all nuclear systems and its
properties are as important in nuclear theory as the hydrogen is in
atomic theory." Almost at the same time, in 1935, the first
theoretical paper on the photodisinte gration of the deuteron
entitled "Quantum theory of the diplon" by Bethe and Peierls (BeP
35) appeared. It is not without significance that these two papers
mark the be ginning of photonuclear physics in general and
emphasize in particular the special role the two-body system has
played in nuclear physics since then and still plays. A steady flow
of experimental and theoretical papers on deuteron photo
disintegration and its inverse reaction, n-p capture, shows the
continuing interest in this fundamental process (see fig. 1.1)."
More than 50 years ago, in 1934, Chadwick and Goldhaber (ChG 34)
published a paper entitled "A 'Nuclear Photo-effect' Disintegration
of the Diplon by -y-Rays."l in the introduction: They noted "By
analogy with the excitation and ionisation of atoms by light, one
might expect that any complex nucleus should be excited or
'ionised', that is, disintegrated, by -y-rays of suitable energy,"
and furthermore: "Heavy hydrogen was chosen as the element first to
be examined, because the diplon has a small mass defect and also
because it is the simplest of all nuclear systems and its
properties are as important in nuclear theory as the hydrogen is in
atomic theory." Almost at the same time, in 1935, the first
theoretical paper on the photodisinte gration of the deuteron
entitled "Quantum theory of the diplon" by Bethe and Peierls (BeP
35) appeared. It is not without significance that these two papers
mark the be ginning of photonuclear physics in general and
emphasize in particular the special role the two-body system has
played in nuclear physics since then and still plays. A steady flow
of experimental and theoretical papers on deuteron photo
disintegration and its inverse reaction, n-p capture, shows the
continuing interest in this fundamental process (see fig. 1.1)."
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