22ne(p,γ 23na measurement at luna ii · lab=186 kev e lab=215 kev e lab=436 kev e lab=479 kev...
TRANSCRIPT
22Ne(p,γ)23Na MEASUREMENT AT LUNA IIAND IMPACT ON ASTROPHYSICAL SCENARIOS
MARIE-LUISE MENZELfor the LUNA collaboration
NEON-SODIUM CYCLE
INTRODUCTION
> hydrogen burning process> temperature range: 0.1 - 0.4 GK
10!8
10!6
10!4
10!2
100
102
0.1 0.2 0.3 0.4 0.5
Therm
on
ucl
ear
React
ion R
ate
TN
RR
(cm
3/m
ol/s
)
Temperature T (109K)
Iliadis 20Ne(p,g)Iliadis 21Ne(p,g)Iliadis 22Ne(p,g)Iliadis 23Na(p,g)Iliadis 23Na(p,a)
21Ne(p,γ)22Na
23Na(p,α)20Ne23Na(p,γ)24Mg
22Ne(p,γ)23Na
20Ne(p,γ)21Na
(C. Illiadis et al., Nucl Phys A 841, 251 (2010)
17F 18F 19F
18Ne 19Ne 20Ne17Ne 21Ne 22Ne
20Na 21Na 22Na 23Na
20Mg 21Mg 22Mg19Mg 23Mg 24Mg 25Mg 26Mg
from CNO-cycle
THE 22Ne(p,γ)23Na REACTION
INTRODUCTIONLU
NA
ener
gy ra
nge
377±3
353 ?
319±3
309±3
278±3
245±1
206 ?
178±3
152±3
100 ?
68 ?35.4±0.5
28±3
3±3
394±3
369 ?
333±3
323±3
291±3
256±1
215 ?
186±3
159±3
104 ?
71 ?37.0±0.5
29±3
3±3
23Na
8794.1122Ne+p
ECM ELab Ex (keV)9171±3
9147 ?
9113±3
9103±3
9072±3
9038.7±1.0
9000 ?
8972±2
8946±3
8894 ?
8862 ?8829.5±0.5
8822±3
8797±3
0
3/2, 5/2+
5/2, 7/2-
1/2+
1/2+1/2+
3/2+
439.990±0.009 5/2+
2076.011±0.022 7/2+
10!8
10!7
10!6
10!5
10!4
10!3
10!2
10!1
100
101
0.1 0.2 0.3 0.4
Th
erm
on
ucl
ea
r R
ea
ctio
n R
ate
log
(NA<
!">
) [c
m3 m
ole
!1 s
ec!
1]
Temperature log(T) [109K]
Elab= 71 keVElab=104 keVElab=159 keVElab=186 keVElab=215 keVElab=436 keVElab=479 keV
(S.E. Hale et al., Phys Rev C 65 (2001))
LUNA II SETUP
> windowless gas target chamber
> proton beam energy: 100 - 400 keV
> HPGe detector (high resolution)
> natural neon gas target 9.3% 22Ne, 0.3% 21Ne, 90.5% 20Ne
> lead and polyethylene-shielding
22Ne(p,γ)23Na MEASUREMENT
beam
indentation for HPGe detector
target chamber
back flangefor calorimeter
SPECTRAL ANALYSIS
22Ne(p,γ)23Na MEASUREMENT
23Na
Ex (keV) 8972±2
8945±2
0
3/2, 5/2
5/2, 7/2-
3/2+
439.990±0.009 5/2+
2076.011±0.022 7/2+
440
keV
1636
keV
0
10
20
30
40
50
60
1610 1620 1630 1640 1650 1660 1670
1600 1610 1620 1630 1640 1650 1660
cou
nts
pe
r ch
an
ne
l
channel number
E! (keV)
signallow energetic BG high energetic BG
1600 1610 1620 1630 1640 1650 1660
0
10
20
30
40
50
60
410 420 430 440 450 460 470
410 420 430 440 450 460 470
cou
nts
pe
r ch
an
ne
l
channel number
E! (keV)
signallow energetic BG high energetic BG
410 420 430 440 450 460 470
Eres = 186 keV lab
RESULTS: RESONANCE STRENGTHS - PRELIMINARY
22Ne(p,γ)23Na MEASUREMENT
(J. Görres et al., Nucl Phys A 408, 372 (1983)
(S.E. Hale et al., Phys Rev C 65 (2001)
(C. Illiadis et al., Nucl Phys A 841, 251 (2010)
-0.87.
0.001
0.01
0.1
1
0.1 1
Ra
tio lo
g(T
NR
Rnew
/TN
RR
NA
CR
E)
Temperature log (T) [109K]
Hale with LUNAIliadis with LUNA
22Ne(p,γ)23Na MEASUREMENT
RESULTS: THERMONUCLEAR REACTION RATE
3. EXPLOSIVE HYDROGEN BURNING IN NOVAE
3.1 ASTROPHYSICAL INTRODUCTION3.2 NUCLEAR NETWORK CALCULATION FOR NOVAE3.3 NEON-SODIUM-CYCLE
> compression of hydrogen matter on white dwarf surface> ignition of hydrogen in degenerated matter> thermonuclear runaway and ejection of outer envelope> 0.1 GK < T < 0.5 GK (120 keV < Ecm < 350 keV)
companion star
white dwarfwith accretion disk
Roche lobe of white dwarf
Roche lobe of companion star
Lagrange point
radiation pressure
gravitationalpressure
mattertransfer
ASTROPHYSICAL INTRODUCTION
EXPLOSIVE HYDROGEN BURNING IN NOVAE
NUCLEAR NETWORK CALCULATION
> public domain libnucnet code (B. S. Meyer, Clemson University)
> Requirements for network calculation:- initial mass composition for 50:50 white dwarf and giant star - temperature-density-profile - thermo-nuclear reaction rates (JINA database)
(C. Ritossa et al., ApJ 460, 489 (1996))
(sourceforge.net/u/mbrandle/nlog/)
10!1
100
80 90 100 110 120 130 140 150 160
Tem
pera
ture
T (
10
9 K
)
Tmax = 0.43 GKTmax = 0.35 GKTmax = 0.30 GKTmax = 0.25 GKTmax = 0.20 GK
100
101
102
103
104
105
80 90 100 110 120 130 140 150 160
Densi
ty !
(g/c
m3)
Time t (sec)
(Starrfield et al., APJSS 127, 458 (2000))
(K. Lodders et al., ApJ 591, 1220 (2003)
EXPLOSIVE HYDROGEN BURNING IN NOVAE
Tem
pera
ture
T (G
K)
Time t (sec)
a.)
b.)
c.)
d.)
e.)f.)
NEON-SODIUM CYCLE
a.) b.)
c.) d.)
e.) f.)
a.) b.)
c.) d.)
e.) f.)
a.) b.)
c.) d.)
e.) f.)
EXPLOSIVE HYDROGEN BURNING IN NOVAE
NEON-SODIUM CYCLE
Tem
pera
ture
T (G
K)
Time t (sec)
a.)
b.)
c.)
d.)
e.)f.)a.) b.)
c.) d.)
e.) f.)
a.) b.)
c.) d.)
e.) f.)
a.) b.)
c.) d.)
e.) f.)
EXPLOSIVE HYDROGEN BURNING IN NOVAE
NEON-SODIUM-CYCLE IN CO-TYPE NOVAE
> strong influence of the 22Ne(p,γ)23Na TNRR on abundance
TNRR x 100TNRR x 0.1
C. Iliadis et al. AJSS, 142 (2002)
(credits to R. Depalo)
EXPLOSIVE HYDROGEN BURNING IN NOVAE
> inactive He core, H-burning shell (0.015 GK < T < 0.06 GK)
> CNO and NaNa cycle cause anti-correlation of Na and O abundance of RGB
> transport of products to the envelope e.g. meridional circulation in radiative zone (dependent of TNRR)
RGB STARS
HYDROSTATIC HYDROGEN BURNING
E. Carretta et al. A&A, 505 (2009)
> CO core, inactive He inter-shell and thin H-burning shell
> hot bottom burning (0.06 GK < T < 0.1 GK) at layer of H-burning shell and convective envelope
> thermal pulsing every 10.000 - 100.000 years: He-shell flash (T > 0.2 GK), H-shell extinction
> convective envelope contains H- and He-burning products
AGB STARS (0.8 < Msolar < 8)
HYDROSTATIC HYDROGEN BURNING
> analysis of 5 resonances> determination of new resonance strengths for Eres = 186 keV> determination of large TNRR uncertainty in 0.03 GK < T < 0.3 GK
SUMMARY
22Ne(p,γ)23Na MEASUREMENT AT LUNA II
ASTROPHYSICAL IMPACT
> explosive hydrogen burning in novae> hydrostatic hydrogen burning in AGB and RGB stars
LUN
A en
ergy
rang
e
377±3
353 ?
319±3
309±3
278±3
245±1
206 ?
178±3
152±3
100 ?
68 ?35.4±0.5
28±3
3±3
394±3
369 ?
333±3
323±3
291±3
256±1
215 ?
186±3
159±3
104 ?
71 ?37.0±0.5
29±3
3±3
23Na
8794.1122Ne+p
ECM ELab Ex (keV)9171±3
9147 ?
9113±3
9103±3
9072±3
9038.7±1.0
9000 ?
8972±2
8946±3
8894 ?
8862 ?8829.5±0.5
8822±3
8797±3
0
3/2, 5/2+
5/2, 7/2-
1/2+
1/2+1/2+
3/2+
439.990±0.009 5/2+
2076.011±0.022 7/2+