Mathematics – Probability
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt........72m&link_type=abstract
Thesis (PH.D.)--THE OHIO STATE UNIVERSITY, 1982.Source: Dissertation Abstracts International, Volume: 43-05, Section: B, page: 1
Mathematics
Probability
Scientific paper
Two different investigations were undertaken that involve the study of gamma decay from nuclei produced in nuclear reactions. In one experiment, the structure of an unusual intermediate structure state in ('41)Sc was investigated; the second experiment sought to determine the gamma decay strength of ('11)C at an excitation energy of astrophysical significance. A cluster of intermediate structure states is known to exist in ('41)Sc centered around an excitation energy of 7.2 MeV. These states are thought to be formed from the relatively pure coupling of a 2p(, 1/2) proton to the. (DIAGRAM, TABLE OR GRAPHIC OMITTED...PLEASE SEE DAI). excited state of the ('40)Ca core. If this interpretation is correct, there should be a reasonable probability for the 2p(, 1/2) proton dropping into the d(,3/2) hole with the emission of a 7.2 MeV E1 gamma ray leaving the ('41)Sc nucleus in its ground state. The study of the ('40)Ca(p,(gamma))('41)Sc reaction was undertaken to measure the anticipated enhancement of the gamma decay widths of these states. Seven states, including a state of ambiguous spin which is not a member of the intermediate structure, were examined for capture gamma ray decay to the ground state of ('41)Sc. The lowest of these states occurred at E(,p) = 6.035 MeV and the highest state occurred at 6.405 MeV. No gamma decay enhancement was observed. Indeed, only upper limits of (TURN)10(' -3) w.u. for the E1 transitions from the 5/2('+) states and (TURN)10('-2) w.u. for the expected M1 transitions from the intruder state were set. The lack of enhancement may arise either from a cancellation of the transition amplitude due to configuration mixing with collective states of the core or a radial wave function mismatch. The second experiment sought to measure the gamma decay width of the 8.105 MeV state in ('11)C. This state, if it has a sufficiently large gamma decay width, could influence the stellar nucleosynthesis of ('11)B and ('12)C. This state can be populated by the ('7)Be((alpha),(gamma))('11)C reaction by helium burning in red giant stars. This state, along with the 8.424 MeV state, was populated by the ('9)Be(('3)He,n)('11)C* reaction at a bombarding energy of 5.2 MeV. Gamma rays were detected in coincidence with neutrons to determine (GAMMA)(,(gamma))/(GAMMA) for these two states. The values determined for (GAMMA)(,(gamma))/(GAMMA) were .03 (+OR-) .018 and .63 (+OR-) .34 for the 8.105 and 8.424 MeV states respectively. These values indicate that the ('7)Be((alpha),(gamma))('11)C reaction rate at red giant temperature is less important in ('11)B production than previously thought.
No associations
LandOfFree
Measurement of Gamma Decay Strengths in Scandium -41 and CARBON-11. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Measurement of Gamma Decay Strengths in Scandium -41 and CARBON-11., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measurement of Gamma Decay Strengths in Scandium -41 and CARBON-11. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1019993