($gamma$,p) reaction of $sup 27$Al and $sup 31$P

Journal Article · Fri Dec 01 04:00:00 EST 1972 · Kakuriken Kenkyu Hokoku, v. 5, no. 2, pp. 44-50

OSTI ID:4343469

Tsubota, H; Kawamura, N; Oikawa, S; Sugawara, M; Shoda, K

Energy spectra of the ( gamma , p) reaction of /sup 27/Al and /sup 31/P were observed, and differential cross section was obtained. The proton energy spectra taken at the electron energy of 23 MeV by varying target thickness show the same structure, the same position of peak and the same counting rate as previous measurement. The proton energy spectra for various incident electron energy were also measured. The differential cross section at the angle of 90 deg was obtained from the spectra. The position of peaks and relative intensity were similar to the absorption cross section of gamma and the ( gamma , n) cross section of iiAl. This fact suggests that the mechanism of gamma absorption in the present experiment is same as that of ( gamma , n) reaction. The cross section oi ( gamma , pi) reaction was a little larger than that of ( gamma , pi) reaction. This fact seems to be due to the spin-parity of the ground state and first excited state of /sup 26/Mg and the ground state of /sup 27/Al. The proton energy spectra of /sup 31/ P( gamma , p) /sup 30/Si reaction were observed. Shape of the spectra depends largely on the differential cross section of the ( gamma , p/sub 0/) reaction. The differential cross sections of the /sup 31/P( gamma , pi) and /sup 31/P( gamma ,p/sub 1/) reactions were obtained. Cross structure of the differential cross section of the /sup 31/P( gamma , p/sub 0/) reaction was similar to that of /sup 31/S( gamma , p/sub o/) /sup 31/P, and suggests the same mechanism o f gamma absorption. This mcans that the protons contributing to the differential cross section of the /sup 31/P( gamma , p/sub 0/ ) and /sup 32/S( gamma , p/ sub 1/) are in the same orbit and in the 2S/sub 1/2/ orbit. (Kato, T.)

• Research Organization: Tohoku Univ., Sendai
• NSA Number: NSA-29-022903
• OSTI ID: 4343469
• Journal Information: Kakuriken Kenkyu Hokoku, v. 5, no. 2, pp. 44-50, Journal Name: Kakuriken Kenkyu Hokoku, v. 5, no. 2, pp. 44-50; ISSN KKYHB
• Country of Publication: Japan
• Language: Japanese

Related Subjects

*ALUMINIUM 27-- PHOTONUCLEAR REACTIONS
*PHOSPHORUS 31-- PHOTONUCLEAR REACTIONS
*PHOTONUCLEAR REACTIONS
ABSORPTION
DIFFERENTIAL CROSS SECTIONS
ELECTRON BEAMS
ELECTRONIC STRUCTURE
EXCITED STATES
GROUND STATES
MAGNESIUM 26
MEV RANGE 10-100
N68451* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
20 <= A <= 38--Nuclear Reactions & Scattering
PARITY
PROTON SPECTRA
PROTONS
REACTION KINETICS
SILICON 30
SPIN