Neutron capture cross sections for the astrophysical r-process
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1 Neutron capture cross sections for the astrophysical r-process Artemis Spyrou Oslo, May 2015 Artemis Spyrou, May 2015, Slide 1
2 Overview R-process nucleosynthesis Uncertainties oneutron capture rates Experiment Results Future plans Artemis Spyrou, May 2015, Slide 2
3 Nucleosynthesis paths Z 56 Fe Stellar burning pp chain N Artemis Spyrou, May 2015, Slide 3
4 Open questions: What is the site of the r-process? Core Collapse Supernova? Neutron Star Merger? Credit: Erin O Donnell, MSU Credit: NASA Goddard Artemis Spyrou, May 2015, Slide 4
5 r-process calculations neutron star merger hot wind cold wind Abundance pattern is different for the different astrophysical scenarios. Does one of them reproduce the observed abundances best? Why can t we tell? M. Mumpower, J. Cass, G. Passucci, R. Surman, A. Aprahamian, AIP Adv. 4, (2014) Artemis Spyrou, May 2015, Slide 5
6 r-process masses Sensitivity studies β-decay T 1/2 Observations r- process Astrophysical modeling Neutron captures Nuclear theory β-delayed neutrons Artemis Spyrou, May 2015, Slide 6
7 Nuclear Physics Uncertainties: (n,γ) Monte-Carlo variations of (n,γ) rates within a factor 100. Surman and Engel PRC (2001) Artemis Spyrou, May 2015, Slide 7
8 Current (n,γ) measurements Artemis Spyrou, May 2015, Slide 8
9 Neutron Capture Uncertainties (n,γ) (A-1, Z) γ Hauser Feshbach Nuclear Level Density Constant T+Fermigas, back-shifted Fermi gas, superfluid, microscopic γ-ray strength function Generalized Lorentzian, Brink-Axel, various tables Optical model potential Phenomenological, Semi-microscopic Level density (A, Z) γ-strength functionn ALL OMP 95 Sr(n,γ) 96 Sr TALYS Artemis Spyrou, May 2015, Slide 9
10 Traditional Oslo method Reaction based Applicable closer to stability Populate the compound nucleus of interest through a transfer or inelastic scattering Extract level density and γ-ray strength function Calculate semi-experimental (n,γ) cross section Excellent agreement with measured (n,γ) reaction cross section T.G. Tornyi, M. Guttormsen,et al., PRC2014 Artemis Spyrou, May 2015, Slide 10
11 Neutron Capture β-oslo (n,γ) β - (A, Z-1) (A-1, Z) γ (A, Z) Populate the compound nucleus via β-decay Spin selectivity correct for it Extract level density and γ-ray strength function Advantage: Can reach (n,γ) reactions where beam intensity is 1 pps. Spyrou, Liddick, Larsen, Guttormsen, et al, PRL2014 Artemis Spyrou, May 2015, Slide 11
12 Experimental techniques 20 meter K500 Cyclotron Gas Stopper ReA3 Hall ReAccelerator Facility K1200 Cyclotron A1900 Fragment Separator SuN β-decay experiments with fast beams SuN β-decay experiments with stopped beams Fast Beams Gas Stopper Stopped beams Reaccelerated Beams Artemis Spyrou, May 2015, Slide 12
13 Summing NaI - SuN mm E x = E γ1 + E γ2 + E γ3 + E γ x16 inch 45 mm borehole 2 pieces 8 segments 24 PMTs Efficiency > 85% for 1 MeV A. Simon, S.J. Quinn, A.S., et al., Nucl. Instr. Meth A 703, 16 (2013) Artemis Spyrou, May 2015, Slide 13
14 Proof-of-principle: 75 Ge(n,γ) 76 Ge (n,γ) β - 76 Ga: T 1/2 = 32.6 s Q β- = 7.0 MeV S n ( 76 Ge) = 9.4 MeV Spyrou, Liddick, Larsen, Guttormsen, et al, PRL2014 Artemis Spyrou, May 2015, Slide 14
15 Proof-of-principle: 75 Ge(n,γ) 76 Ge 76 Ga decay Spyrou, Liddick, Larsen, Guttormsen, et al, PRL2014 Artemis Spyrou, May 2015, Slide 15
16 Proof-of-principle: 75 Ge(n,γ) 76 Ge γ P(E γ,e x ) = ρ(e x E γ )T (E γ ) Spyrou, Liddick, Larsen, Guttormsen, et al, PRL2014 Artemis Spyrou, May 2015, Slide 16
17 Functional form of level density and strength function Three normalization points Low-energy level density. Level density at S n. Average radiative width at S n. Normalizations (S n ) from Systematics Microscopic calculations < > normalized from systematics Spyrou, Liddick, Larsen, Guttormsen, et al, PRL2014 Artemis Spyrou, May 2015, Slide 17
18 Results: 75 Ge(n,γ) 76 Ge Spyrou, Liddick, Larsen, Guttormsen, et al, PRL2014 Artemis Spyrou, May 2015, Slide 18
19 Weak r-process measurements R. Surman, et al.,, AIP Advances 4, (2014) 70 Co 70 Co 70 Co: T 1/2 = 108 ms Q β- = 12.3 MeV S n ( 70 Ni) = 7.3 MeV Artemis Spyrou, May 2015, Slide 19
20 Applicability Wide range of applicability Short lifetimes Low production rates Bounded by Q values Delayed neutron emission Artemis Spyrou, May 2015, Slide 20
21 Collaboration Michigan State University B. Crider S.N. Liddick K. Cooper A.C. Dombos R. Lewis D.J. Morrissey F. Naqvi C. Prokop S.J. Quinn A. Rodriguez C.S. Sumithrarachchi R.G.T. Zegers University of Oslo A.C. Larsen M. Guttormsen T. Renstrøm S. Siem L. Crespo-Campo Central Michigan University G. Perdikakis Notre Dame A. Simon Los Alamos National Lab A. Couture S. Mosby Lawrence Livermore National Lab D.L. Bleuel A. C. L. and M. G. acknowledge financial support from the Research Council of Norway, project grant no This work was supported by the National Science Foundation under Grants No. PHY , and No. PHY , and PHY Artemis Spyrou, May 2015, Slide 21
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