The comparison between observational abundance features and those obtained from nucleosynthesis predictions of stellar evolution and/or explosion simulations can scrutinize two aspects: (a) the conditions in the astrophysical production site and (b) the quality of the nuclear physics input utilized. Here we test the abundance features of r-process nucleosynthesis calculations using four different fission fragment distribution models. Furthermore, we explore the origin of a shift in the third r-process peak position in comparison with the solar r-process abundances which has been noticed in a number of merger nucleosynthesis predictions. We show that this shift occurs during the r-process freeze-out when neutron captures and β-decays compete and an (n,γ)-(γ,n) equilibrium is not maintained anymore. During this phase neutrons originate mainly from fission of material above A = 240. We also investigate the role of β-decay half-lives from recent theoretical advances, which lead either to a smaller amount of fissioning nuclei during freeze-out or a faster (and thus earlier) release of fission neutrons, which can (partially) prevent this shift and has an impact on the second and rare-earth peak as well.

1.
C.
Sneden
,
J. E.
Lawler
,
J. J.
Cowan
,
I. I.
Ivans
, &
E. A. Den
Hartog
,
ApJS
182
,
80
(
2009
).
2.
C.
Freiburghaus
,
S.
Rosswog
, &
F.-K.
Thielemann
,
ApJ
525
,
L121
(
1999
).
3.
A.
Bauswein
,
S.
Goriely
, &
H.-T.
Janka
,
ApJ
773
,
78
(
2013
).
4.
S.
Rosswog
,
O.
Korobkin
,
A.
Arcones
,
F.-K.
Thielemann
, &
T.
Piran
,
MNRAS
439
,
744
(
2014
).
5.
I.
Petermann
,
K.
Langanke
,
G.
Martinez-Pinedo
, et al,
European Physical Journal A
48
,
122
(
2012
).
6.
E. P.
Steinberg
&
B. D.
Wilkins
,
ApJ
223
,
1000
(
1978
).
7.
T.
Kodama
&
K.
Takahashi
,
NuPhA
239
,
489
(
1975
).
8.
I. V.
Panov
,
C.
Freiburghaus
, &
F.-K.
Thielemann
,
Nuclear Physics A
688
,
587
(
2001
).
9.
I. V.
Panov
,
I. Y.
Korneev
, &
F.-K.
Thielemann
,
Astronomy Letters
34
,
189
(
2008
).
10.
A.
Kelic
,
M. V.
Ricciardi
, &
K.-H.
Schmidt
, in
Dynamical Aspects of Nuclear Fission 6, Conference Proceedings
(
World Scientific
,
2008
), p.
203
.
11.
S.
Rosswog
,
T.
Piran
, &
E.
Nakar
,
MNRAS
430
,
2585
(
2013
).
12.
F. X.
Timmes
&
F. D.
Swesty
,
ApJS
126
,
501
(
2000
).
13.
C.
Winteler
,
R.
Käppeli
,
A.
Perego
, et al,
ApJL
750
,
L22
(
2012
).
14.
P.
Möller
,
J. R.
Nix
,
W. D.
Myers
, &
W. J.
Swiatecki
,
Atomic Data and Nuclear Data Tables
59
,
185
(
1995
).
15.
Y.
Aboussir
,
J. M.
Pearson
,
A. K.
Dutta
, &
F.
Tondeur
,
Atomic Data and Nuclear Data Tables
61
,
127
(
1995
).
16.
J. M.
Pearson
,
R. C.
Nayak
, &
S.
Goriely
,
Physics Letters B
387
,
455
(
1996
).
17.
T.
Rauscher
&
F.-K.
Thielemann
,
Atomic Data and Nuclear Data Tables
75
,
1
(
2000
).
18.
S.
Goriely
,
S.
Hilaire
, &
A. J.
Koning
,
A&A
487
,
767
(
2008
).
19.
S.
Goriely
,
S.
Hilaire
,
A. J.
Koning
,
M.
Sin
, &
R.
Capote
,
Phys. Rev. C
79
,
024612
(
2009
).
20.
P.
Möller
,
B.
Pfeiffer
, &
K.-L.
Kratz
,
Phys. Rev. C
67
,
055802
(
2003
).
21.
NuDat2
.
2009
,
National Nuclear Data Center, information extracted from the NuDat 2 database, URL
http://www.nndc.bnl.gov/nudat2/
22.
I. V.
Panov
,
I. Y.
Korneev
,
T.
Rauscher
, et al,
A&A
513
,
A61
(
2010
).
23.
I. V.
Panov
,
E.
Kolbe
,
B.
Pfeiffer
, et al,
Nuclear Physics A
747
,
633
(
2005
).
24.
T.
Marketin
,
L.
Huther
, &
G.
Martinez-Pinedo
,
in preparation
(
2015
).
25.
I. V.
Panov
,
Y. S.
Lutostansky
, &
F.-K.
Thielemann
,
Bull. Russ. Acad. Sci. Phys.
,
in press
(
2015
).
26.
C.
Sneden
,
J. J.
Cowan
, &
R.
Gallino
,
Ann.Rev.Astron.Astrophys.
46
,
241
(
2008
).
27.
S.
Goriely
,
J.-L.
Sida
,
J.-F.
Lemaitre
, et al,
Physical Review Letters
111
,
242502
(
2013
).
This content is only available via PDF.
You do not currently have access to this content.