THE FORMATION OF SINGLE MESONS BY GAMMA QUANTA

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600380447-4
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: September 12, 2011
• Sequence Number: 447
• Publication Date: March 21, 1951
• Content Type: REPORT

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SUBJECT
HOW
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WHERE
PUBL'ISHED"
DATE
PUBLISHED
LANGUAGE
INFORMATION FROM
FOREIGN DOCUMENTS OR RADIO BROADCASTS CD NO.
CLASSIFICATION CONFIDENTIAL[BI N MENTIA1
Scientific -- Nuclear physics, mesons
Monthly periodical
Moscow
Dec 1950
DATE OF
INFORMATION 1950
DATE DIST..21 Mar 1951 50X1-HUM
SUPPLEMENT TO
REPORT NO.
TNif DOCUNRMT CONTAINS INFORMATION AFFICTINO TNC NATIONAL DIPINSI
OF THE UNITID STATES WITNIN THE MEANING OF ESPIONAGE ACT EO
U. I. C.. EI AMP SS. AS AMINOSD. ITS TRANSMISSION OR THE RIVILATION
01 ITS CONTINTI IN ANY MANNIR TO AN UNAUTHORIIID PINSON IS PRO'
MISITID IT LAW. REPRODUCTION OF THIS FORM If PROHIIITID.
Zhurnal Eks erimental'no i Teoretichesko Fiziki, Vol 7IX, No 12, 1950,
pp 1057-63.
THE FORMATION OF SINGLE MESONS BY GAMMA KUAHTA
A. M. Bardin and V. V. Mikhaylov
Phys Inst imeni Lebedev, Aced Sci USSR
L^ brief digest of the above report follows_7
The authors calculate the differential effective cross section of the
formation of charged mesons by gamma quanta in the nucleons. The calcu-
lations are carried out for scalar, pseudoscalar, and vector (with tensor
bond) theories. The angular distributions of the mesons generated are
graphed.
The formation of mesons by photons was investigated by A. Sakharov (Zhur
Eksper Teor Piz, Vol 17, p 686, 1947), by Benoist-Guental, Prentki, and
Ratier (Comptes Rendus, 1950), and by Foldy (Phy Rev, 1949). In these works,
however, they did not pay sufficient attention to the angular distribution of
the mesons formed, which is of well-known interest in connection with the
experimental works of Steinberger and Bishop (Phy Rev, 195,0), since the calcu-
lations were conducted only according to the scalar and pseudoscalar theories.
The authors of the present article calculate also according to the vector
theory.-
To clarify the nature of-the an gar distribution of mesons for practical
regions of energies of gamma quanta (several 100Es Mev) one can with sufficient,
accuracy consider the nucleons.as nonrelativistic particles. Therefore, it is'
expedient, in the Hamiltonian described in the relativistic form for a system
consisting of a nucleon in-electromagnetic and mesonic fields, as done.by
Bhabha (Proc Roy Soc, 1938) and"Wentzel (Rev Mod Phy, 1947); to make a tran-
sition to-Pauli's approximation for the nucleon (mesons, of course, are con-
sidered as relativistic particles). As a result of this transition; one
obtains' certain expressions for the interaction of nucleons with the meson
field, namely, the (a) scalar variant, (b) pseudoscalar variant (in the,ca4 of
gradient bond), asd (c) vector variant.
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After a lengthy mathematical treatment the authors obtain the differential
cross sections as a function of the angle for these three types.
The authors thank M. A. Markov, who proposed to them this topic, for his
aid in its execution. They also thank G. I. ICharlamova for her assistance in
the numerical work.
CONFIDENTIAL
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