Population III stars: What is their fate

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Population III stars What is their fate?
G.M. Fuller et al., 1986, Ap.J., 307
Nonrotating suppermasive stars (M gt 105 M)
Black Hole
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Interest in 12N(p,?)13O
M. Wiescher et al., 1989, Ap.J.,343
Hot pp chains rap-process chains alternative
paths to bypass 3? ? 12C
pp-I p(p,e?)d(p,?)3He(3He,2p)4He pp-II
7Be(e-,?)7Li(p,?)4He pp-III 7Be(p,?)8B(??)8Be(?)
4He ? it dominates at T9 gt 0.05 pp-IV
7Be(p,?)8B(p,?)9C(??)9B(p)8Be(?)4He pp-V
7Be(?,?)11C(??)11B(p,2?)4He rap-I
7Be(p,?)8B(p,?)9C(?,p)12N(p,?)13O(??)13N(p,?)14O
rap-II 7Be(?,?)11C(p,?)12N(p,?)13O(??)13N)p,?)1
4O rap-III 7Be(?,?)11C(p,?)12N(??)12C(p,?)13N(p,
?)14O rap-IV 7Be(?,?)11C(?,p)14N(p,?)15O

• process material
• from pp cycles into CNO nuclei
• T (2-3)?108 K prior to He burning via 3?
  reaction

• Can hot pp/rap-process chains produce sufficient
  CNO material to blow up nonrotating supermassive
  stars with Z 0 ?

• What about the cases of very massive Pop. III
  stars studied recently?

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ANC as indirect method (cntd)

• peripheral proton transfer at lab. energy ( 10
  AMeV) 12N 14N ? 13O 13C

Reaction vertices in the proton transfer
DWBA amplitude
13O ? (12N p)
p
Conventional approach
Peripheral transfer (r gt RN)
ANCs for 14N are known ! (L.Trache et al., PRC
58 (1998))
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Data analysis of elastic scattering
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Data analysis of elastic scattering (cntd)
NV0.37, NW1, tR1.20 fm,tW 1.75 fm
OMP double folding w/ JLM eff. inter. L.
Trache et al., PRC 61 (2000) F. Carstoiu et al.,
PRC 70 (2004)
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Results
ANC for 13Og.s. ? 12N p
Astrophysical S-factor by definition
From ANC to S-factor
Courtesy A. Mukhamedzhanov
Total S1-12
S(keVb)
Courtesy A. Mukhamedzhanov
Ecm (keV)
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Slides in reserve
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