Observation of the 3n evaporation channel in the complete hot-fusion reaction 26Mg + 248Cm leading to the new superheavy nuclide 271Hs.
The analysis of a large body of heavy ion fusion reaction data with medium-heavy projectiles (6 < or = Z < or = 18) and actinide targets suggests a disappearance of the 3n exit channel with increasing atomic number of the projectile. Here, we report a measurement of the excitation function of the reaction (248)Cm ((26)Mg,xn)(274-x)Hs and the observation of the new nuclide (271)Hs produced in the 3n evaporation channel at a beam energy well below the Bass fusion barrier with a cross section comparable to the maxima of the 4n and 5n channels. This indicates the possible discovery of new neutron-rich transactinide nuclei using relatively light heavy ion beams of the most neutron-rich stable isotopes and actinide targets.
Technische Universität München, D-85748 Garching, Germany.
J
J
Dvorak
W
W
Brüchle
M
M
Chelnokov
Ch E
ChE
Düllmann
Z
Z
Dvorakova
K
K
Eberhardt
E
E
Jäger
R
R
Krücken
A
A
Kuznetsov
Y
Y
Nagame
F
F
Nebel
K
K
Nishio
R
R
Perego
Z
Z
Qin
M
M
Schädel
B
B
Schausten
E
E
Schimpf
R
R
Schuber
A
A
Semchenkov
P
P
Thörle
A
A
Türler
M
M
Wegrzecki
B
B
Wierczinski
A
A
Yakushev
A
A
Yeremin