Carlo Broggini, INFN-Padova Nuclear Burning in Stars (E star ) ( E ) = S(E) e –2 E -1 2 cm m m m m...
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Transcript of Carlo Broggini, INFN-Padova Nuclear Burning in Stars (E star ) ( E ) = S(E) e –2 E -1 2 cm m m m m...
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.
NUPECC-VeneziaLaboratory for Underground
Nuclear Astrophysics
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, B.Limata, R.Menegazzo, 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)
LUNALUNAMen in pits or wells sometimes see the stars…. Aristotle
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
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)
PLB 591(2004)61A&A 420(2004)625
10-7 mbar 10-6 mbar 10-4 mbar
0.5-2 mbar
Windowless gas-targetMax 10 mbar
CalorimeterBGO
Low energy: gas target + BGO
(Estar) LUNA has shown that it is possible to measure
3He (3He,2p)4He from he Sun
14N(p,)15O
cno
NovaeAGB starsRGB starsGlobular cluster