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

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

Core Collapse Dissociation back to n, p, and a 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

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

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 CH2 target Unmeasured. SM/TES suggests ‘feasible’ (@ 10^7 pps). 45V(p,g)46Cr DRAGON Use (p,p) as guide. Coordinated approach TRIUMF EEC July 8th 2005

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

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