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Carlo Broggini, INFN-Padova
Nuclear Burning in Stars
(Estar)
(E) = S(E) e–2E-1
2cm
mmmm
AstrophysicalFactor
GamowFactor
Reaction Rate(star) (E) (E) dE
Gamow Peak
MaxwellBoltzmann
Extrap. Meas.
NOW2004Laboratory measurements of
Astrophysical factors
INFN - Laboratori Nazionali del Gran Sasso
R.Bonetti, C.Broggini*,F.Confortola, P.Corvisiero,H.Costantini, J. Cruz, A.Formicola, Z. Fülöp, G.Gervino, A.Guglielmetti, C.Gustavino, G. Gyurky, G. Imbriani, A.P.Jesus, M.Junker, A.Lemut, R.Menegazzo, A.Ordine, P.Prati, V.Roca, D.Rogalla, C.Rolfs, M.Romano, C.RossiAlvarez, F.Schümann, O.Straniero,F.Strieder, E.Somorjai,F.Terrasi,H.P.Trautvetter
•INFN :
Genova, LNGS, Milano, Napoli, Padova, Torino
•Inst.Physik mit Ionenstrahlen, Ruhr-Universität Bochum (GE)
•Centro de Fisica Nuclear da Universidade de Lisboa (Portugal)
•Atomki Debrecen (Hungary)
LUNALUNA
m-2 h-1 n
cm-2 s-1
luna
LUNA2 (400 kV)
Voltage Range :50-400 kV Output Current: 1 mA (@ 400 kV)
Absolute Energy error±300 eV
Beam energy spread: <100 eV
Long term stability (1 h) :5 eV
Terminal Voltage ripple:5 Vpp Ge detector
LUNA1 ( 50 kV)
Voltage Range :1 - 50 kV
Output Current:1 mA
Beam energy spread:20 eV
Long term stability (8 h):10-4
Terminal Voltage ripple:5 10-5
p + p d + e+ + e
d + p 3He +
3He +3He + 2p 3He +4He 7Be +
7Be+e- 7Li + +e 7Be + p 8B +
7Li + p 8B 2 + e++ e
84.7 % 13.8 %
13.78 % 0.02 %
pp chain
measured2004-2005
3He (3He,2p)4He
Q = 12.86 MeV
min= 0.02 pb
Epmax= 10.7 MeV
from the Sun
14N(p,)15O
Q=7.3 MeV
cno
cno S1,14
Globular Cluster Age
S(0)=3.5-1.6+0.4 keV b (Ad98)
S(0)=3.2-0.8+0.8 keV b
(An99)
E<1.2 MeV
E<1.7 MeV
S 14,1 /5
S 14,1 x5
Standard CF88
gamma spectrum of 14N(p,)15O at Ep=140 keV
“High” energy: solid target + HpGe
14N(p,)15Og.s. transition
S gs(0)=0.25±0.06 keV b(LUNA)
S gs(0)=1.55±0.34 keV b (Schr87)
S tot(0)=1.7±0.1 ±0.2 keV b (LUNA) ~ 0.5
Globular cluster age: +0.7-1 Gy
cno ~ 0.5
S gs(0)=0.08+0.13–0.06 keV b
(Ang01)
Ebeam = 80 keV Low energy: gas target + BGO
(Estar) LUNA has shown that it is possible to measure
Past:
Present:
Future:
3He (3He,2p)4He from he Sun
14N(p,)15O cno
,Globular cluster age
3He(,)7Be the Sun
6.79 MeV transition
S 6.79(0)=1.63±0.17 keV b (Ang01)
S 6.79(0)=1.41±0.02 keV b (Schr87)
S 6.79(0)=1.35±0.05±0.08 keV b (LUNA)
14N(p,)15O
D abundance
Proto-stars
Big-bang
D(p,)3He
Q = 5.5. MeV
3He(,)7Be
Q=1.6 MeV
Solar Neutrinos Sun core properties
B
S1,7~
S(0)=0.53±0.05 keV b (Ad98)
S(0)=0.54±0.09 keV b (An99)
Solar thermometer
If S34/S34˜3-5% and B/B~3%
Better than Helioseismology
S3,40.84 * * T20
25Mg(p,)26Al
Q=6.3 MeV
Nucleosynthesis of 24<A<27
Astronomical interest of the from 26Al decay
(image taken by COMPTEL)