Presentation on theme: "R-Matrix Analysis of 15 N(p, 0 ) 16 O using the program AZURE. P.J. LeBlanc April 23 rd, 2008 Sante Fe, NM."— Presentation transcript:
R-Matrix Analysis of 15 N(p, 0 ) 16 O using the program AZURE. P.J. LeBlanc April 23 rd, 2008 Sante Fe, NM
Outline: Previous experimental data Experimental update of the 15 N(p, 0 ) performed at Notre Dame in April 2007 Using AZURE to analyze the results
Experimental Background: Previous results published by Rolfs in 1974. This data was re-analyzed using an early version of AZURE by Ed Simpson. Results indicated that the interference between the resonances was critical in determining S(0).
New Experiment at Notre Dame: 3.5 MV KN VdG accelerator 1 MV JN VdG accelerator
Experimental Set Up @ ND: Used a Ge Clover Detector set up at 45° Clover was used in Add-Back mode. Targets used were TiN, enriched in 15 N, around 8 keV thick at 430 keV.
AZURE Analysis: Set Up Need Data files: (p, 0 ) obviously, but any other data will help constrain the parameters. (p,p) & (p, 0 ) data sets are also included Nuclear Physics Environment: Spins and parities of particles involved Also energy levels and some initial values for the gamma widths.
Current included Data Sets: 15 N(p,p) 15 N Hagedorn (1957): 160°, 125°, 90° Bashkin (1959): 90 °, 160.8° 15 N(p, 0 ) 16 O Notre Dame 2007 Data 15 N(p, 0 ) 12 C Schardt (1952): 160° Redder (1982): 160° Zyskind (1979): 160°
Nuclear Physics Environment Resonance Transitions: 12.442 & 13.091, 1 - States Particle pair (ev) (p,p)900 (p,g)12 (p,a0)102000 1- 15N+p Gamma decay S=0-, l=1 S=1-, l=0,1,2 Indicates component not included by setting rwa = 0.0. In, general, only the lowest l-value is allowed Elastic scattering 15N+p 1- 15N+p 16O+ Starting parameters from TUNL Indicates component excluded by parity considerations. Alpha decay 1- 15N+p 12C+α 0 S=0+, l=1 S=0-, l=1 S=1-, l=0,1,2 E1 0+ Particle pair i (ev) (p,p)100000 (p,g)32 (p,a0)40000 12.442 MeV State 13.091 MeV State
Initial AZURE calculation: (p,p)
Initial AZURE Calculation: (p, 0 ) & (p, 0 ): All calculations look very good using just the literature values of the experimental partial widths. Note that no target integration or convolution included. So what does the fit look like?
First try for AZURE fit: (p,p)
First try for AZURE fit: (p, 0 ) & (p, 0 ): Fits still need a little work…but look promising. / point: p,p): 1.66 (p, 0 ):.98 (p, 0 ): 6.27
Closing Remarks: Improving the fit Look into the (p,p) data Could be a problem with the scan Notre Dame (p,p) data available Adding the (p, 1 ) data would help Include the recent LUNA (p, 0 ) data
Thanks to Dick! Little did I know back in 2004 what I was getting myself into!! But working with the AZURE code under Dick’s guidance taught me more nuclear physics than I could have hoped to learn in any class.