Ground-state photoneutron reactions in /sup 14/C

Journal Article · Fri Feb 01 04:00:00 EST 1985 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.31.318· OSTI ID:6160225

Kuo, P C; McNeill, K G; Sherman, N K; Landsberger, S; Davidson, W F; Jury, J W; Lafontaine, J R.C.

Photoneutron time-of-flight spectra from the /sup 14/C(..gamma..,n/sub 0/)/sup 13/C reaction were measured as functions of laboratory angle over the excitation energy region from 10 to 28 MeV. Angular distribution coefficients and differential cross sections were extracted as functions of excitation energy between 10 and 23 MeV. The angle-integrated ground-state cross section indicates that ground state transitions dominate the T/sub less-than/ giant dipole resonance region below 13 MeV, but only contribute about 50% of the strength in the neutron channel in the rest of the giant dipole resonance region. The results support a mechanism of dominant E1 absorption in the energy region from 13 to 23 MeV where an average value of a/sub 2/ = -0.5 indicates p/sub 1/2/..-->..d/sub 3/2/ single-particle neutron transitions. Angular distribution information suggests that much of a prominent resonance at 11.3 MeV (with an integrated cross section of about 1.03 MeV mb) is due to an M1 transition from the ground state of /sup 14/C. If this is the case, there is little fragmentation of the M1 strength i

• Research Organization: Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7
• OSTI ID: 6160225
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 31:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS