Spin-flip (p,n) reactions on /sup 26/Mg, /sup 54/Fe, and /sup 56/Fe at selected proton bombarding energies in the range of 17 to 25 MeV

Technical Report · Sat Jun 01 00:00:00 EDT 1985

DOI:https://doi.org/10.2172/5400326· OSTI ID:5400326

Aron, D L

New data are presented for the /sup 26/Mg(p,n)/sup 26/Al reaction at E/sub p/ = 19.12 and 24.97 MeV, for the /sup 54/Fe(p,n)/sup 54/Co reaction at E/sub p/ = 17.20, 18.60, and 24.60 MeV, and for the /sup 56/Fe(p,n)/sup 56/Co reaction at E/sub p/ = 19.12 and 24.59 MeV. Data were taken with the LLNL Cyclograaff at 16 angles from 3.5/sup 0/ to 159.0/sup 0/. A large detector at 23.8/sup 0/ with a long neutron flight path collected high resolution spectra. This large detector also collected separate 0/sup 0/ high resolution data on the /sup 26/Mg and /sup 56/Fe(p,n) reactions at E/sub p/ = 19 MeV. Absolute differential (p,n) cross sections were extracted for 1/sup +/ states in /sup 26/Al, /sup 54/Co, and /sup 56/Co, for the 0/sup +/ isobaric analong state (IAS) in /sup 54/Co and /sup 56/Co, for a 2/sup +/ state in each residual nucleus, and for the 0.199 MeV 7/sup +/ state of /sup 54/Co. No new experimental states were identified. Only relative cross sections were extracted at 0/sup 0/. Experimental angle-integrated cross sections were obtained for all but one state. DWBA79 was used, with the G-matrix effective nucleon-nucleon interaction of Bertsch et al. (with the central triplet-odd component V/sub to/ = O) and the Livermore shell model wave functions to calculate differential (p,n) cross sections to 1/sup +/ states and to the /sup 54/Co and /sup 56/Co IAS. Normalization of the DWBA angle-integrated cross sections to measurements for the /sup 54/Co and /sup 56/Co IAS (at E/sub p/ = 24.6 MeV) yielded the renormalized V/sub tau/ = 21.4 +- 2.1 MeV. Normalization of the DWBA angle-integrated cross sections to measurements for the 24.6 MeV /sup 54/Co and /sup 56/Co 1/sup +/ states, coupled with the normalization of the wave functions to previously experimentally determined GT strength, yield the renormalized V/sub sigmatau/ = 12.3 +- 1.2 MeV. The experimental Gamow-Teller strength B(GT)/sub exp./ of the T = 1 /sup 26/Al state at 9.44 MeV was found to be 0.69; B(GT)/sub exp/ of the T = 1 /sup 26/Al state at 10.47 MeV was found to be 0.39.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5400326
• Report Number(s): UCRL-53649; ON: DE85015664
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted. Thesis
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
IRON 54 TARGET
PROTON REACTIONS
IRON 56 TARGET
MAGNESIUM 26 TARGET
SPIN FLIP
ANGULAR DISTRIBUTION
CHARGE-EXCHANGE REACTIONS
DIFFERENTIAL CROSS SECTIONS
DWBA
EXPERIMENTAL DATA
MEV RANGE 10-100
NUCLEON-NUCLEON INTERACTIONS
OPTICAL MODELS
RENORMALIZATION
SHELL MODELS
BARYON REACTIONS
BARYON-BARYON INTERACTIONS
BORN APPROXIMATION
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DISTRIBUTION
ENERGY RANGE
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
INFORMATION
INTERACTIONS
MATHEMATICAL MODELS
MEV RANGE
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
TARGETS
651425* - Nuclear Properties & Reactions
A=20-38
Experimental- Nuclear Reactions & Scattering- (-1987)
651525 - Nuclear Properties & Reactions
A=39-58
Experimental- Nuclear Reactions & Scattering- (-1987)