Stellar (n,gamma) cross section of 62Ni.
The 62Ni(n,gamma)63Ni(t(1/2)=100+/-2 yr) reaction plays an important role in the control of the flow path of the slow neutron-capture (s) nucleosynthesis process. We have measured for the first time the total cross section of this reaction for a quasi-Maxwellian (kT=25 keV) neutron flux. The measurement was performed by fast-neutron activation, combined with accelerator mass spectrometry to detect directly the 63Ni product nuclei. The experimental value of 28.4+/-2.8 mb, fairly consistent with a recent calculation, affects the calculated net yield of 62Ni itself and the whole distribution of nuclei with 62<A<90 produced by the weak s process in massive stars.
Nassar
H
H
Racah Institute of Physics, Hebrew University, Jerusalem, Israel, 91904.
Paul
M
M
Ahmad
I
I
Berkovits
D
D
Bettan
M
M
Collon
P
P
Dababneh
S
S
Ghelberg
S
S
Greene
J P
JP
Heger
A
A
Heil
M
M
Henderson
D J
DJ
Jiang
C L
CL
Käppeler
F
F
Koivisto
H
H
O'Brien
S
S
Pardo
R C
RC
Patronis
N
N
Pennington
T
T
Plag
R
R
Rehm
K E
KE
Reifarth
R
R
Scott
R
R
Sinha
S
S
Tang
X
X
Vondrasek
R
R