Experimental Nuclear Astrophysics: Lecture 3. Chris Wrede National Nuclear Physics Summer School June 20 th, 2018
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1 : Lecture 3 Chris Wrede National Nuclear Physics Summer School June 20 th, 2018
2 Outline Lecture 1: Introduction & charged-particle reactions Lecture 2: Neutron-induced reactions Lecture 3: What I do (indirect methods) 2
3 Today Nova contribution to Galactic 26 Al? b decay of 26 P to probe 25 Al(p,g) 26 Si Are pre-solar nova grains from novae? b decay of 31 Cl to probe 30 P(p,g) 31 S Conditions for CNO-cycle breakout in X-ray bursts? b decay of 20 Mg to probe 15 O(a,g) 19 Ne 3
4 Radioactive 26 Al across Milky Way Data from COMPTEL & INTEGRAL-SPI Figure courtesy of MPE Garching / Roland Diehl 4
5 Classical novae Nova Cygni 1992 (in 1994) NASA, ESA, HST S. Starrfield et al., (1971, 1972) J. Jose et al., Nucl. Phys A777, 550 (2006) 5
6 Nucleosynthesis in novae J. Jose, Proceedings of Science, NIC XI 050 (2011) 6
7 25 Al(p,g) 26 Si reaction in novae 7
8 Measuring key Al(p,g) 26 Si resonance strength with 26 P decay 7 g 12 p p g g NSCL experiment E10034 M. B. Bennett et al., Phys. Rev. Lett. 111, C. Wrede, (2013) NNPSS, June
9 NSCL National user facility for rare isotope science and education: Nuclear structure, nuclear astrophysics, fundamental symmetries, societal applications On Michigan State University campus 9
10 Production of 26 P at NSCL 150 MeV/u, 75 pna 36 Ar beam, 1.55 mg/cm 2 Be target 75% pure beam of up to P ions per second at experiment M. B. Bennett et al., Phys. Rev. Lett. 111, (2013) 10
11 Detectors W. F. Mueller et al., NIMA 466, 492 (2001) SeGA GeDSSD N. Larson, S. N. Liddick et al., NIMA 727, 59 (2013) M. B. Bennett et al., Phys. Rev. Lett. 111, (2013) 11
12 26 P(b + g) 26 Si spectrum M. B. Bennett et al., Phys. Rev. Lett. 111, (2013) 12
13 Astrophysical Conclusions Amount of 26 Al produced in novae on white dwarfs of different masses: Conclusion: novae produce up to 30% of the 26 Al in Milky Way M. B. Bennett et al., Phys. Rev. Lett. 111, (2013) Nucleosynthesis simulations by Jordi Jose (UPC C. Barcelona) Wrede, NNPSS, June
14 Pre-solar grains ~1 micron SiC Grain from Murchison meteorite L. Nittler,
15 Pre-solar nova grain candidates Andrew M. Davis, PNAS (2011) 15
16 Pre-solar nova grain candidates Andrew M. Davis, PNAS (2011) 16
17 What should a SiC nova grain look like? J. Jose et al. Astrophys. J. 612, 414 (2004) 17
18 Populating 30 P(p,g) 31 S resonances with 31 Cl decay NSCL Experiment M. B. Bennett et al., Phys. Rev. Lett. 116, (2016) M. B. Bennett, Ph.D. thesis (MSU, 2016) 18
19 Production of 31 Cl at NSCL 150 MeV/u, 75 pna 36 Ar beam, 1.63 mg/cm 2 Be target 95% pure beam of up to Cl ions per second M. B. Bennett et al., Phys. Rev. Lett. 116, (2016) M. B. Bennett, Ph.D. thesis (MSU, 2016) 19
20 CloverShare HPGe array M. B. Bennett et al., Phys. Rev. Lett. 116, (2016) M. B. Bennett, Ph.D. thesis (MSU, 2016) 20
21 31 Cl(b g) data M. B. Bennett et al., Phys. Rev. Lett. 116, (2016) M. B. Bennett, Ph.D. thesis (MSU, 2016) 21
22 31 Cl b decay scheme: a new state! M. B. Bennett et al., Phys. Rev. Lett. 116, (2016) M. B. Bennett, Ph.D. thesis (MSU, 2016) 22
23 Thermonuclear 30 P(p,g) 31 S reaction rate New state could be dominant 30 P(p,g) 31 S resonance in novae. Need to measure proton emission branch and lifetime to determine resonance strength M. B. Bennett et al., Phys. Rev. Lett. 116, (2016) M. B. Bennett, Ph.D. thesis (MSU, 2016) 23
24 Low-energy b delayed charged particles Measure 31 Cl(b p) 31 S through new 30 P(p,g) 31 S resonance to determine p / Challenge: usual method using Si detectors yields massive b-particle background A. Saastamoinen, Ph.D. thesis (2011, Jyvaskyla) 24
25 Solution: gas-filled detector Micropattern gas amplifier: principle of operation Y. Giomataris et al., NIM A 376, 29 (1996) E. Pollacco et al., NIM A 723, 102 (2013) 25
26 New Proton Detector at NSCL Measure 31 Cl(b p) 31 S through new 30 P(p,g) 31 S resonance and determine p / (NSCL E17024) Geant4 simulation of 31 Cl decay by D. Perez-Loureiro 26
27 Proton Detector commissioning Micromegas Proton Detector with part of SeGA around it 27
28 Commissioning experiment: 25 Si(bp) 24 Mg (NSCL E17023) Ready to run 31 Cl(b p) 31 S in Fall 2018 (will also measure 31 S lifetimes at TRIUMF in Fall 2018) 28
29 X-ray burst light curve RXTE; Galloway et al., Astrophys. J. 179, 360 (2008) 29
30 X-ray burst 30
31 Break out from hot CNO cycles M. Wiescher et al., J. Phys. G 25, R133 (1999) C. Iliadis, AIP Conf. Proc. 1213, 3 (2010) 31
32 rp process Figure: H. Schatz 32
33 Which reactions impact the X-ray burst light curve? R. Cyburt et al., Astrophys. J. 830, 55 (2016) 33
34 Key 15 O(a,g) 19 Ne resonance g ~ 1 a B. Davids et al., Phys. Rev. C 67, (2003) W. P. Tan et al., Phys. Rev. Lett. 98, (2007) W. P. Tan et al., Phys. Rev. C 72, (2005) R. Kanungo et al., Phys. Rev. C 74, (2006) B. Davids et al., Astrophys. J. 735, 40 (2011) 34
35 New idea: b decay of 20 Mg to probe key 15 O(a,g) 19 Ne resonance C. Wrede et al., Phys. Rev. C 96, (R) (2017) 35
36 20 Mg(b p g) spectra (NSCL E14066) 4033-keV 15 O(a,g) 19 Ne resonance is populated in 20 Mg b decay! C. Wrede et al., Phys. Rev. C 96, (R) (2017) 36
37 Proton Detector upgrade to TPC Geant4 simulation by D. Perez-Loureiro Measure 20 Mg(b p a) 15 O through 4033-keV 15 O(a,g) 19 Ne resonance to determine a / (NSCL E18033) C. Wrede et al., Phys. Rev. C 96, (R) (2017) 37
38 Summary 26 P b decay experiment to constrain 26 Al production in novae via 25 Al(p,g) 26 Si reaction rate 31 Cl b decay experiments to ID candidate pre-solar nova grains via 30 P(p,g) 31 S reaction rate 20 Mg b decay experiments to investigate CNO-cycle break out via 15 O(a,g) 19 Ne reaction in type I x-ray bursts 38
39 Collaborating institutions For NSCL E10034, E12028, E14066 (beta-gamma work): Colorado School of Mines Joint Institute for Nuclear Astrophysics McMaster University Michigan State University National Superconducting Cyclotron Laboratory University of Notre Dame Oak Ridge National Laboratory Universitat Politècnica de Catalunya University of Southern Indiana University of Tennessee Texas A&M University University of Washington Yale University For NSCL E17023, E17024, E18033 (Proton Detector work): CEA-Saclay Michigan State University National Superconducting Cyclotron Laboratory Texas A&M University 39
40 Conclusions Nuclear physics affects the production of elements in stars Need nuclear astrophysics experiments to understand our origins! Direct measurements of nuclear cross sections at the relevant energies are challenging, but possible in many important cases Indirect cross-section measurements complement direct ones Other nuclear data also important: masses, weak interactions, Nuclear theory complements nuclear experiment (unstable reactants, thermal excitations, dense matter equation of state, ) 40
41 Thank you for your attention! 41
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