Proton emission from deformed rare earth nuclei Robert Page.

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Presentation transcript:

Proton emission from deformed rare earth nuclei Robert Page

Simple model for spherical proton emitters Proton decay of 160 Re Q p = 1271 keV AREA 2/1 et 

160 Re Half-life (ms) E p (keV) d 3/2 h 11/2 Expt h 11/2 d 3/2 Proton emission as a spectroscopic tool

Deformed proton emitters P.J. Woods et al., PRC69 (2004) Tb

Known Proton Emitters B. Blank & M.J.G. Borge, Progress in Particle and Nuclear Physics 60 (2008) 403

Known Proton Emitters B. Blank & M.J.G. Borge, Progress in Particle and Nuclear Physics 60 (2008) 403 Selectivity Yield Why are there so few known proton emitters in this region?

Implantation – proton – alpha correlation Decay Particle Energy (MeV) Counts (  10 6 ) / 10 keV

Counts / 10 keV Decay Particle Energy (MeV) t 1/2 = 21  s The proton emitter 159 Re D.T. Joss et al., Physics Letters B641 (2006) 34

Implantation – proton correlations P.J. Woods et al., PRC69 (2004) Cr + 92 Mo → 135 Tb + p6n Argonne FMA A = 135 only 60  m thick DSSD

Beta-decay half-lives Moller, Nix & Kratz, Atomic Data & Nuclear Data Tables 66 (1997) 131

Proton-decay half-lives

Fusion-evaporation reactions Compound nuclei

Fusion-evaporation p x n reactions  30  b  3 nb

(Super-)FRS  A & Z separation Isomer  decays or known p for unique A & Z identification AIDA Selectivity

Predicted Super FRS /s Neutron number N  Atomic number Z  = 3.6 / hour = 0.6 / week Yield

Predicted Super FRS /s Neutron number N  Atomic number Z  = 3.6 / hour = 0.6 / week Yield

Some physics opportunities New proton emitters Weak proton-decay branches Proton-decay fine structure Precision measurements Beta-delayed gamma spectroscopy

Outstanding questions Background from  and  p decays (1 mm thick DSSDs cf. 60  m) Identify best physics cases Choose best primary beam Your input is welcome... Robert Page