Measurements of level densities in hot nuclei

1. Measurements of level densities in hot nuclei Submitted to the LNL PAC

2. Level density and CN population

3. A ~110 A ~160 Nuclear Level density studies Shell closure Spectra of  200Pb K ~ 8 K ~ 12 K ~ 13 D. Fabris et al., PRC 50 (1994)

4. 1) 2) 3) alfa spectra at Theta= 15° Energy (MeV) Isospin Effects on Nuclear Level density Al-Quraishi et al., PRC63 (2001) 065803 Al-Quraishi et al., PRC67 (2003) 015803 8LP@LNL protons protons No evidence of Z-Zo effects No possible to discriminate between st. and N-Z

5. Measurement of the Level Density (I) At moderate excitation energies of the CN, the high energy part of the particle spectrum arises mainly from the first step decay. • A~ 100, Eproton= 13 – 20 MeV predominantly from 1st step • Typical range of applicability EX= 5 – 25 MeV D.R. Chakrabarty et al., PRC 51 (1995)

6. Measurement of the Level Density (II) Measurement of the LD for a specific nucleus D.R. Chakrabarty et al., PRC 51 (1995)

7. Measurement of the Level Density (II) (p,n) reactions A.V. Voinov et al., PRC 74 (2006) A. Wallner et al., PRC 51 (1995)

8. Systems Proposed and Experimental Needs 86Sr 86Zr 86Mo 61Ni • Light particle spectra with high precision over many decades • Angular distributions • CN contribution tagging (ER residues detection) Detectors at LNL: GARFIELD, 8LP (charged particles) and RIPEN (neutrons)

9. 60 MeV 16O + 58Fe  74Se 60 MeV 16O + 58Ni 74Kr