Simultaneous measurements of ({ital {rvec p}},{ital {rvec p}}{prime}) and ({ital {rvec p}},{ital p}{prime}{gamma}) observables for the 15.11 MeV, 1{sup +}, {ital T}=1 state in {sup 12}C at 200 MeV

Journal Article · Wed Nov 01 00:00:00 EST 1995 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.52.2559· OSTI ID:122389

Wells, S P; Wissink, S W; Bacher, A D; Berg, G P.A.; Bowyer, S M; Chang, S; Franklin, W A; Liu, J; Stephenson, E J ^[1]; Beene, J R; Bertrand, F E; Halbert, M L; Mueller, P E; Olive, D H; Stracener, D W; Varner, R L ^[2]; Lisantti, J ^[3]; Hicks, K H ^[4]

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1. Indiana University Cyclotron Facility, Bloomington, Indiana 47408 (United States)
2. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
3. Centenary College of Louisiana, Shreveport, Louisiana 71134 (United States)
4. Ohio University, Athens, Ohio 45701 (United States)

We have made simultaneous measurements of singles ({ital {rvec p}},{ital {rvec p}}{prime}) spin-transfer observables and coincident ({ital {rvec p}},{ital p}{prime}{gamma}) yields and asymmetries for the 15.11 MeV, 1{sup +}, {ital T}=1 state in {sup 12}C, at an incident proton bombarding energy of 200 MeV. Data were taken at four proton scattering angles ranging from {theta}{sub {ital p}}{sup c.m.}=5.5{degree} to 16.5{degree}. Both vertical (normal to the reaction plane) and horizontal (in-plane) incident beam polarizations were used, which allowed us to extract 16 different observables for this transition. In particular, using the ({ital {rvec p}},{ital p}{prime}{gamma}) reaction, we measured the sideways and longitudinal analyzing powers, {ital D}{sub 0{ital S}} and {ital D}{sub 0{ital L}}, which vanish identically in the ({ital {rvec p}},{ital p}{prime}) reaction. Detailed comparisons of all observables to calculations done in both relativistic and nonrelativistic formalisms are presented. Surprisingly, a relativistic description in which knock-on exchange processes are not explicitly included provides the best overall agreement with the data.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 122389
• Journal Information: Physical Review, C, Vol. 52, Issue 5; Other Information: PBD: Nov 1995
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
PROTON REACTIONS
POLARIZATION-ASYMMETRY RATIO
ASYMMETRY
CARBON 12 TARGET
COINCIDENCE METHODS
KNOCK-ON REACTIONS
MEV RANGE 100-1000
PHOTONS
POLARIZED BEAMS
PROTONS