The 9.63 MeV state of C12

Journal Article · Thu Nov 30 23:00:00 EST 1961 · Nuclear Physics

DOI:https://doi.org/10.1016/0029-5582(61)90035-9· OSTI ID:4803301

Carlson, Richard R.

Gamma radiation from the 16.1l-Mev state to the 9.63Mev state in C¹² was identified with a three-crystal pair spectrometer and with 15 cm long by 12.7 diameter NaI(Tl) crystal detectors. The 6.45 plus or minus 0.05-Mev line occurs with a branching ratio of 1% of the well-known 11.67 to 4.43-Mev cascade radiation. The l6.ll-Mev state of Ci¹² was obtained by bombardment of thick boron targets with protons at the 163-kev resonance for the B¹¹ + p reaction. The yield of 6.45-Mev radiation showed resonance at the same energy as the cascade radiation. Coincidence spectra taken with two detectors, biased at 1.0 Mev, showed that less than 2.5% of the 6.45--Mev radiation is accompanied by gamma radiation, in agreement with the known alpha decay of the 9.63Mev state. The angular distribution of the 6.45-Mev radiation was measured. It is only consistent with a spin and parity of 3- for the 9.63-Mev state, when taken with the known alpha decay.

• Research Organization: State Univ. of Iowa, Iowa City
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-007063
• OSTI ID: 4803301
• Journal Information: Nuclear Physics, Journal Name: Nuclear Physics Journal Issue: 3 Vol. 28; ISSN 0029-5582
• Publisher: Elsevier
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ANGULAR DISTRIBUTION
BORON 11
BRANCHING RATIO
CARBON 12
COINCIDENCE METHODS
CRYSTAL COUNTERS
DECAY
DENSITY
ENERGY LEVELS
GAMMA RADIATION
MEASURED VALUES
NEUTRON FLUX
NEUTRONS
PARITY
PROTONS
RESONANCE
SCATTERING
SPECTRA
SPECTROMETERS
SPIN
TARGETS
THICKNESS
VELOCITY