Nuclear Data Section
International Atomic Energy Agency
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Memo CP-D/618
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25 February 2010
Distribution
N. Otsuka, S.Dunaeva

Subject:

Two remarks on heavy-ion induced two-body reaction

We always define the heavier nuclide as the “reaction product” and code it in SF4
except for some processes (e.g. scattering, fission). We should be careful to
REACTION coding when heavier nuclide is detected. Below I show two examples
from heavy-ion induced reaction:

1. “Transfer reaction” measured by detection of heavier nuclideBelow A. T. Rudchik et al.[1] shows data sets measured for 7Li(18O,17Og.s.) 8Lig.s.

Because angular distribution of 17O is given for, the REACTION code is3-LI-7(8-O-18,3-LI-8)8-O-17,,DA,RSD, namely we need RSD in SF7 even if the data set is given in the angle for the centerof mass system. The data can be expressed by the tautology formalism(3-LI-7(8-O-18,3-LI-8)8-O-17,,DA,RSD)=(8-O-18(3-LI-7,3-LI-8)8-O-17,,DA)
if both incident energy and scattering angle are given in center-of-mass system.

2. “Transfer reaction” regarded as elastic scattering in EXFOR
Below T. Motobayashi et al. [2] shows two data sets measured with 16O beam and 12C
target:Left: Angular distribution of 12C detected measured for 16O(12C,12Cg.s.)16Og.s.
Right: Angular distribution of 16O in 16O(12C,16Og.s.)12Cg.s.

These can be interpreted as “elastic scattering” and “α-transfer reaction”, respectively.
16O

16O

16

12O

C

α12C

12C

12C

16O

In EXFOR, however, these two data sets are regarded as elastic scattering because
Q=0, and they have to be coded as
1. 8-O-16(6-C-12,EL)8-O-16,,DA,,RTH
2. 8-O-16(6-C-12,EL)8-O-16,,DA,RSD, namely the second data set is regarded as elastic scattering data even if it isinterpreted as data for transfer reaction.
On the assumption of parity invariance and momentum conservation, the data table
for the REACTION code #2 can be also explained by
2a 6-C-12(8-O-16,EL)6-C-12,,DA
2b 8-O-16(6-C-12,EL)8-O-16,,DA (with θ cm → 180-θ cm )The expression 2a can be combined with 2. by the tautology formalism if bothincident energy and scattering angle are given in center-of-mass system.
2c (8-O-16(6-C-12,EL)8-O-16,,DA,RSD)=(6-C-12(8-O-16,EL)6-C-12,,DA,RSD)(In this case, 2a should be used in the right hand side of the tautology formalism.)References[1] A. T. Rudchik et al., Nucl. Phys. A831(2009)139(EXFOR D5072, in compilation)[2] T. Motobayashi et al., Nucl. Phys. A331(1979)193(EXFOR E0109, figure images are taken from his thesis.)

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