Production yields of light short lived isotopes at SARAF

35 Pages·2006·1.93 MB·English

Production yields of
light short lived isotopes
at SARAF
Dan Berkovits, SOREQ NRC
Michael Hass, The Weizmann Institute
With much help from Sergey Vaintraub
Talk content:
Introduction
Production yield calculation
Proposals for experimental setup
14,15
O
6
He
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Project (2005-2007) aim
A feasibility study for a RIB facility
and proposals for a relatively low
cost RIB apparatus at SARAF, in
order to enlarge experimental
nuclear science infrastructure and
promote the research in the field in
Israel.
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SARAF is a multi-application facility based
+
on a 40 MeV p / d / H 2 mA linac
2
Only a small fraction of the beam time can
be devoted for RIB Î low cost
Significant contribution to front end nuclear
science using the unique beam characters
of SARAF
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First direct reaction yield calculations
Energy current 40, 2 40, 2 40, 0.2
(MeV,mA) Proton Deuteron Alpha

Target product Yield(a/s) product Yield(a/s) product Yield(a/s)
He6 5.09E+11 Li8 1.56E+13 Li9 4.18E+08
Li7
Be7 1.27E+13 Be7 1.59E+13 Be10 1.90E+11
Be7 9.62E+1 Li8 3.32E+09
Be10 5.40E+08 Be7 3.63E+08 C11 3.89E+10
B8 2.34E+11 Be11 6.50E+05 C14 2.96E+10
C12 C10 1.76E+10 B8 4.72E+08 N13 4.46E+08
C11 3.13E+13 B12 5.90E+12 O14 5.51E+09
N11 2.21E+08 C11 6.68E+12 O15 6.37E+11
N12 1.86E+12 N12 2.58E+1
N13 9.31E+12
Compare to: Texas A&M 104 8B @ 8 MeV/u Triumf 8x108 8Li @ 1.5 MeV/u
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Highest interest candidates and
production schemes for RIB in SARAF
1. Direct reaction
14 14
N(d,2n) O
14 15
N(d,n) O
2. Two-stage production
9 9 6
Be(d,xn)Î Be(n,α) He
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14
O (t =70.6 s)
1/2
15
O (t =122.2 s)
1/2
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Mg (12)
CNO cycle breakout
Na (11) 14
Ne (10) T1/2=1.7s
Very Hot CN(O)-Cycle T
9 ~ 0.3 F (9) 111213
O (8)
still “beta limited”
N (7) 9 10
14O(α,p)17F
C (6)
3 4 5 6 7 8
3α flow
Breakout
Mg (12)
processing beyond CNO cycle
Na (11) 14
after breakout via:
Ne (10)
T9 >~ 0.3 15O(α,γ)19Ne F (9) 111213
T9 >~ 0.6 18Ne(α,p)21Na O (8)
N (7) 9 10
C (6)
3 4 5 6 7 8
Downloaded from: H. Schatz 3α flow
www.nscl.msu.edu/~schatz/PHY983/Notes/rp_process.ppt
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Mass accretion from a companion
into a white-dwarf or neutron star
Donor Star
(“normal” star)
Accretion Disk
Neutron Star
Understanding Understanding Red Giant to
X-ray bursts White Dwarf mass transfer
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Cross section (mb)
Cross section calculation benchmark
300
14 15
N(d,n) O 6(2003-fit)
Alice
250
1(98)
2(90)
3(77)
200
4(69)
5(85)
EmpireII
150
100
50
0
0 5 10 15 20 25 30 35 40
Deuteron energy (MeV)
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