Physics/History Collective enhancements: REDISTRUBTUION of the MANY-BODY density of states from high  low excitation energy for deformed nuclei. At high.

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Physics/History Collective enhancements: REDISTRUBTUION of the MANY-BODY density of states from high  low excitation energy for deformed nuclei. At high T (sp occupation smeared out)  deformed-to-spherical transition and low-energy enhancements die. We searched for this transition (at ANL) and did NOT find it (2007 PRC). Conclusions: A transition (if it exists) is either more diffuse in E* than predicted (SU3 SM) AND/OR lower in E* than we looked. We also said (re SMMC) …. Continued search for the Fade out Fade out of collective enhancements Charity, Reviol, Sobotka [WU] & Chajecki [MSU-?] Since then Yoram Alhassid has done exactly that  his work suggests we have to look lower in E*.  Detailed excitation function study of 2, 3, and 4 n evaporation spectra of both deformed and ~ spherical rare earths.

Our previous work NO evidence for Fade out found E* > 50 MeV With Col. En. Without Col. En. RESULTS EXPECTATIONS

Alhassid’s recent results look E* ~ MeV (for deformed nuclei )  Do NOT expect to see transition (no Coll. En.) leading to 144 Nd residues  Do expect to see transition reflected in n-spectra (leading to) Nd residues. NEED  Excitation functions of high-quality neutron spectra leading from to nuclei with 10 MeV < E*< 30 MeV K = Enhancement factor

Q-A Charity/Sobotka Most important physics question (for stable beams)  Search for demise of collect enhancements Either use fusion [as we did before  ANL] or (p,p’) or (a,a’) [as we did for GDR built on excited states with Thoennessen  TAMU] How do these questions relate to the present priorities of the field.  Don’t know – Don’t care. Accelerator and tech. WITHOUT GS or GRETINA  Interested in excellent beam timing & few meter n-TOF for intermediate angles in front of FMA WITHOUT GS or GRETINA. Beam intensities should not be a problem. TECH development  Unrelated to Collective Enhancements, we are interested in advancing tech. for large Si-strip arrays or arrays of PSD capable scintillators.  Our new HINP chip will be ready this fall. HUGH dynamic range (two simultaneous shapers) improved DISC.