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Where next (with HDU)?

Explore beyond 132Sn and 134Sn, with a focus on proton states, 2-neutron transfer, and new regions like 70Ni. Improve theoretical input, elastic scattering, and reaction models for accurate descriptions of reactions and better control over uncertainties. Use Tiara and EXOGAM for performance optimization.

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Where next (with HDU)?

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  1. Where next (with HDU)? • Q-value • mass. • excitation energies. • Angular distributions of recoils • l-value • spectroscopic information

  2. Transfer reaction toolbox

  3. Where next … • Beyond 132Sn • 134Sn, 136Te etc.. • Proton states with (d,n). • 2-neutron transfer (t,p)? (10Be,8Be)? • Beyond N=50 • 84Ge, 86Se etc.. • New regions • 70Ni region. • both neutron and proton single-particle states. • batch mode beams of 44Ti, 56Ni, 59Fe.

  4. What is needed for a successful nuclear reaction program? (the theorist’s wish) • data for several channels (elastic, inelastic…) • range of energies (low versus high) • more theory Optical potentials are an essential input to calculations should we not be working toward a CH89_ri and BG_ri? - nucleon elastic scattering of rare isotopes at least (p,p) then theory for (n,n) (?) - heavy ion elastic scattering of rare isotopes • Other things that can help: • elastic • elastic breakup • inelastic breakup • (p,d) reaction models need to incorporate the structure: should we be using standard radius and diffuseness? by probing different energies we get a glimpse into different parts of the structure we are interested should we be using Hartree Fock densities, radii, etc for unstable nuclei? (often unable to even predict the correct bound state…) by probing different energies we can test whether our simplified structure assumptions are correct • needaccuratedescription of the reaction • better control over uncertainties in inputs • improved understanding of reaction dynamics • keeping contact with underlying many body structure

  5. 134Te(d,p)135Te PRELIMINARY ~0.66 MeV (p3/2) ~1 MeV (p1/2) ~1.8 MeV (f5/2 ?) g.s. (f7/2) Counts Q value (MeV)

  6. Super ORRUBA Energy-dependent lengths and high thresholds Position-dependent gains • Funding received Sept. 2009. • Detectors ordered Nov. 2009. • Design done by June 2010. • Prototype arrive Dec. 2010. • Full order June 2011. • Full array June 2012. • 512 channel system ordered ~2008 • 512 channel system implemented June 2010. • 2056 channel system implemented June 2011.

  7. TIARA Performance Only core signals from EXOGAM clovers, limiting Doppler correction to 65 keV broadening g p

  8. TIARA Performance Only core signals from EXOGAM clovers, limiting Doppler correction to 65 keV broadening g p

  9. John Schiffer Principle of operation Measured quantities Flight time: Tflight=Tcyc Position: z Energy: Elab Derived quantities Part. ID: m/q Energy: Ecm Angle: qcm B=2T

  10. 136Xe(d,p) online spectrum – B.Kay, Nov. 2009 Preliminary

  11. (d,n) and b-delayed neutrons with VANDLE • Intend to measure 25Al(d,n) • Astrophysically important 26Al possibly created by: • 25Al (p,γ)→26Si(β+) →26Al • rp-process waiting point nuclei • 56Ni(d,n) Optimize efficiency for 60° to 180° for ejected neutrons. 150 keV > En > 15 MeV 1.5 meter flight-path for large bars cover central angles. Shorter path for small bars cover lower energy neutrons at back angles.

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