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Discussion Outcomes: Nuclear Astrophysics

Discussion Outcomes: Nuclear Astrophysics. Experiments Equipment/Facility needs Manpower. Reactions in nuclear astrophysics. ( p, g ) (novae, rp - process, big bang) ( a,g ) (red giants) ( a ,p ) ( rp -process) 12 C + 12 C fusion (supernovae)

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Discussion Outcomes: Nuclear Astrophysics

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  1. Discussion Outcomes:Nuclear Astrophysics • Experiments • Equipment/Facility needs • Manpower

  2. Reactions in nuclear astrophysics • (p,g) (novae, rp-process, big bang) • (a,g) (red giants) • (a,p) (rp-process) • 12C + 12C fusion (supernovae) • (n,g) (r-process, s-process) • (a,n) (s-process, red giants) • (p,a) (novae) • (g,p), (g,n), (g,a) (p-process) + g strength function HIϒS is one of several tools available for this field. K. E. Rehm HIgS-II workshop TUNL, June 2, 2013

  3. The formation of 16O via the 12C(a,g)16O reaction a(12C,16O)g Goal 1 fb K. E. Rehm HIgS-II workshop TUNL, June 2, 2013

  4. Measuring the 12C(a,g)16O via Photodisintegration • Instead of the capture reaction, measure the inverse reaction 16O(g,a)12C. The two cross sections are related by the principle of detailed balance and there is a gain of x40 in the photodisintegration cross section The Optical Time Projection Chamber (OTPC) • Gas (Target/Detector) filled volume (CO2+N2) • Grid provides the total energy (DE/E of 4 %) • PMTs provide the Time-Projection (10 ns bins): out-of-plane angle of the track • Optical Readout provides the track image: in-plane angle of the track

  5. Summary Thoughts on 16O(γ,α) • Impactful measurements can be done now • Measurements at and below Ec.m.=1 MeV benefit • tremendously from increased flux • Techniques will be improved iteratively • This physics is not “all or nothing” • Must balance measurements at the lowest energies • with high-precision work at higher energies

  6. Few-Body Reactions forBig-Bang Nucleosynthesis • D(γ,p)n • 3He(γ,p)D • Can be measured with TPC technique • Driven in part by improvements in D observations • High precision needed: ideally ~2%

  7. Equipment / Facility Needs • Vacuum / Bremsstrahlung improvement for • bubble chamber measurements • Optical TPC can be upgraded: • - longer detector • - new scintillator • - faster camera system • Beam flux monitor • - more dynamic range • - absolute calibration • Improved energy resolution with HIγS2 • would benefit many experiments • Data acquisition • - accommodate higher data rate • - flash ADC

  8. Manpower Needs • Data acquisition • Some projects lack local leadership

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