Measurement of the sup 12 C( p ,. pi. sup 0 ) sup 13 N reaction by recoil detection

Journal Article · Sun Mar 01 04:00:00 EST 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.45.1276· OSTI ID:7277248

Homolka, J; Schott, W; Wagner, W; Wilhelm, W ^[1]; Saber, M; Segel, R E ^[2]; Bent, R D; Fatyga, M; Pollock, R E ^[3]; Kienle, P ^[4]; Rehm, K E ^[5]

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1. Physik Department, Technische Universitaet Muenchen, Muenchen (Germany)
2. Northwestern University, Evanston, Illinois 60208 (United States)
3. Indiana University Cyclotron Facility, Bloomington, Indiana 47408 (United States)
4. Gesellschaft fuer Schwerionenforschung, Darmstadt (Germany)
5. Argonne National Laboratory, Argonne, Illinois 60439 (United States)

Differential cross sections for the neutral pion production reaction {sup 12}C({ital p},{pi}{sup 0}){sup 13}N{sub g.s.} have been measured at 153.5, 166.1, 186.0, and 204.0 MeV bombarding energy using recoil detection. The shape of the angular distribution agrees well with that of the mirror reaction {sup 12}C({ital p},{pi}{sup +}){sup 13}C{sub g.s.}. Isospin invariance predicts for the ratio of the cross sections {sigma}({ital p},{pi}{sup +})/{sigma}({ital p},{pi}{sup 0})=2. At 153.5, 166.1, and 186.0, MeV, where ({ital p},{pi}{sup +}) cross sections have been reported previously by other groups at the same reduced pion momentum {eta}={ital p}{sub {pi}}/{ital m}{sub {pi}}{ital c}=0.34,0.55,0.78, the ratio of the total cross sections is 2.02{plus minus}0.14, 3.14{plus minus}0.12, and 2.12{plus minus}0.16, respectively. The ({ital p},{pi}{sup 0}) cross sections at 166 MeV is therefore 1.57{plus minus}0.06 times larger than expected. For {ital T}{sub {ital p}}{lt}160 MeV, the experimental cross sections are larger than predicted by a phase space and Coulomb barrier penetration calculation that fits the higher-energy data. Differential cross sections were also obtained for the {sup 12}C({ital p},{pi}{sup {minus}}){sup 13}O reaction, and upper limits set for differential cross sections for radiative capture to the ground state of {sup 13}N.

• OSTI ID: 7277248
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 45:3; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663430* -- Nucleon-Induced Reactions & Scattering-- (1992-)
663520 -- Nuclear Mass Ranges-- A=6-19-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BOSONS
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
COULOMB FIELD
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTRIC FIELDS
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY RANGE
HADRON REACTIONS
HADRONS
ISOTOPES
LIGHT NUCLEI
MESONS
MEV RANGE
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
NITROGEN 13
NITROGEN ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-EVEN NUCLEI
PARTICLE PRODUCTION
PIONS
PIONS NEUTRAL
PROTON REACTIONS
PSEUDOSCALAR MESONS
RADIOISOTOPES
RECOILS
TARGETS
TIME-OF-FLIGHT METHOD