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Spectroscopy of Ta-171

Spectroscopy of Ta-171. By Billy Mohr Advisor: Professor Daryl Hartley. Sponsored by the National Science Foundation. Experiment at Gammasphere. Heavy Ion Fusion Reaction 124 Sn( 51 V,4n) 171 Ta. Experiment was designed to look for Triaxial Deformation.

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Spectroscopy of Ta-171

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  1. Spectroscopy of Ta-171 By Billy Mohr Advisor: Professor Daryl Hartley Sponsored by the National Science Foundation

  2. Experiment at Gammasphere • Heavy Ion Fusion Reaction • 124Sn(51V,4n)171Ta Experiment was designed to look for Triaxial Deformation

  3. ANIMATION OF HEAVY ION FUSION REACTION Process Fusion Evaporation (4 neutrons) Statistical Gamma rays Discrete Gamma Rays Yrast Line BLAM! n n n n

  4. DataAnalysis • Necessary to Do: -Calibration of Detectors • Need to account for Doppler shift of energies due to the moving target. • Same Physics done in General Physics still applies: Ta-171 is moving, thus detectors observes different frequencies. (Energy proportional to frequency) -Efficiency of Detectors • Done with known sources with known energy states of gamma ray emmission. • Important to account for relative efficiency since Gammasphere does not detect different energies equally. Then we can begin to analyze the spectrum

  5. Eu-152 Spectrum Used for Calibration of Detectors since Energies were Known

  6. Relative Efficiency Diagram Used 182Ta, 152Eu, 56Co sources High Energy Low energy Full Range Relative Efficiency Channel # (Correlates to Energy)

  7. Doppler Shift Correction 32° 70° 90° 110° 148° E (Φ) =Eo(1+βcos(Φ)) β=(speed of Ta-171)/(speed of light) Φ=Angle at which detectors were relative to target

  8. Data Analysis of Ta-171 • It is possible to determine shape and behavior of a nucleus from the decay sequences and energy states at which it emits gamma rays. • The energies that Gammasphere detected were sorted into a 3-D Coincidence Matrix • All gamma rays being detected within 80ns were said to be coincidence with one another

  9. Data Analysis of Ta-171 Sample Spectrum

  10. h 9/2 g 7/2 J.C. Bacelar et al., Nucl. Phys. A 442, 54 (1985) (with only 6 detectors) h 11/2 d 5/2 d 3/2 i 13/2

  11. What does all this mean?? • A Level Scheme is useful for: • -Indications of deformations • -Alignment • -Trends in Energies • -Band Structure • -Backbending Backbending is a term used to describe significant gains in angular momentum that’s not due to rotation of the nucleus.

  12. Evidence of Backbending keV Theory predicts crossings at 200 keV for the neutron alignments and 530 keV for the proton alignments Unexplained by Current Theory [g7/2] Predicted by Theory [d5/2] ħ keV

  13. Summary • No evidence for triaxial deformation yet. Further research required • Linked all bands together through transitioning gamma rays. • Found approx. 130 new gamma rays. • Interesting back bending properties Thanks to D.J. Hartley, M.K. Djongolov, F.G. Kondev, H. Amro, A. Aguilar, D.L. Balabanski, M.P. Carpenter, P. Chowdhury, W. Cluff, D.M. Cullen, M. Danchev, G.D. Dracoulis, G.B. Gagemann, A.M. Kishada, K. Lagergren, T. Lauritsen, E.F. Moore, E. Ngijoi-Yogo, S.W. Odegard, A. Pipidis, L.L. Riedinger, S.V. Rigby, M.A. Riley, D.T. Scholes, G. Sletten, S.K. Tandel, C. Teal, J.R. Vanhoy, P.M. Walker, and Jing-ye Zhang

  14. QUESTIONS, CONCERNS, COMMENTS, QUERIES, INQUIRIES, QUANDRIES??

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