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Study of Reactions for 44Ti Synthesis in Core Collapse Supernovae

Investigating key reactions to understand the production of 44Ti in massive star explosions, crucial for modeling supernovae. Proposal for unique research using TRIUMF facility beams for direct measurements and resonance studies. Grant application submitted to EPSRC for support. Purpose of this Letter of Intent is to secure funding and resources for 33 months of research and travel to advance our knowledge in this field.

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Study of Reactions for 44Ti Synthesis in Core Collapse Supernovae

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  1. Letter of Intent: XXXXI Alex Murphy Study of Reactions Important to Synthesis of 44Ti in Core Collaspe Supernovae TRIUMF EEC July 8th 2005 …good evening from Edinburgh

  2. Core Collapse Supernovae Science Case • ‘Easy’ to make Supernovae are… • Some of the most powerful explosions in the Cosmos • Some of the most scrutinised objects in the Universe • Responsible for production of many heavy elements • Responsible for shaping our local distribution of stars • There is consensus on the basic mechanism • But! The best simulations still don’t explode! • Extremely complex • Need a good diagnostic SN1987A 44Ti ! M1 – The Crab TRIUMF EEC July 8th 2005

  3. Core Collapse Massive star (>10–12 M) • Stellar evolution  onion-skin-like structure • At maximum of BE/A, thermal support lost  Core collapses • Shock wave passes through Si layer above core • Dissociation back to n, p, and a • …Nuclear statistical equilibrium… • …Alpha-rich freeze out • Dominant site for 44Ti production • Key reactions to be studied* • 40Ca(a,g) – E1024 • 44Ti(a,g) • 44Ti(a,p) – This work • 45V(p,g) – This work • Triple a * (The et al ApJ 504 (1998) 500) TRIUMF EEC July 8th 2005

  4. 44Ti production • Amount ejected sensitively depends on location of the ‘mass cut’ • Material that ‘falls back’ is not available for detection • 44Ti yield a sensitive diagnostic of the explosion mechanism • Thus, VERY useful for models to make comparisons against • What’s more, it’s (relatively) easily observed • Gamma-Ray observation • 1.157 MeV • INTEGRAL & other missions • Meteoritic data • Enrichment of 40Ca in type X grains Timmes et al. (1996) TRIUMF EEC July 8th 2005

  5. Proposed research Take advantage of unique future ISAC beams • 44Ti(a,p)47V – direct measurement • Gas/implanted target • Trilis, CSB • LEDA/CD • Not measured before at astrophysical energies - extrapolation of previous results suggests it’s eminently feasible (@ 10^7 pps). • 45V(p,p)45V – resonant elastic scattering • Knowledge of 46Cr, precursor to 45V(p,g)46Cr • Trilis, CSB • CH2 target • LEDA/CD • Unmeasured. SM/TES suggests ‘feasible’ (@ 10^7 pps). • 45V(p,g)46Cr • Trilis, CSB • DRAGON • Use (p,p) as guide. Coordinated approach TRIUMF EEC July 8th 2005

  6. UK Grant application • A request has been made to UK’s EPSRC • specifically based on this work, at this facility • Request is for 33 months of PDRA + Travel • Panel meets 27/7/05 • Referees’ reports… • Very positive feedback. • Confident this will be funded TRIUMF EEC July 8th 2005

  7. Purpose of this LoI… • Proposed research requires: • Charge state booster • Laser ion source (TRILIS) • Development of 44Ti and 45V beams Many thanks for your time… And sorry I couldn’t e there And many thanks to Marialuisa!!!! TRIUMF EEC July 8th 2005

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