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Continued search for the

Continued search for the Fade out of collective enhancements Charity, Reviol , Sobotka [ WU] & Chajecki [MSU-?]. Physics/History Collective enhancements: REDISTRUBTUION of the MANY-BODY density of states from high  low excitation energy for deformed nuclei.

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  1. Continued search for the Fade out of collective enhancementsCharity, Reviol, Sobotka [WU] & Chajecki [MSU-?] 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) …. • Since then YoramAlhassidhas 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.

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

  3. K = Enhancement factor Alhassid’s recent resultslook E* ~ 15- 30 MeV (for deformed nuclei ) • Do NOT expect to see transition (no Coll. En.) leading to 144Nd residues • Do expect to see transition reflected in n-spectra (leading to) 152-154Nd residues. NEED Excitation functions of high-quality neutron spectra leading from to nuclei with 10 MeV < E*< 30 MeV

  4. 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. • 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.

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