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R-Matrix Analysis of 15 N(p, 0 ) 16 O using the program AZURE. P.J. LeBlanc April 23 rd, 2008 Sante Fe, NM

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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

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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).

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New Experiment at Notre Dame: 3.5 MV KN VdG accelerator 1 MV JN VdG accelerator

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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.

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Experimental Results:

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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.

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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°

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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

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Initial AZURE calculation: (p,p)

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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?

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First try for AZURE fit: (p,p)

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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

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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

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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.

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