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.
Dvorak
J
J
Technische Universität München, D-85748 Garching, Germany.
Brüchle
W
W
Chelnokov
M
M
Düllmann
Ch E
ChE
Dvorakova
Z
Z
Eberhardt
K
K
Jäger
E
E
Krücken
R
R
Kuznetsov
A
A
Nagame
Y
Y
Nebel
F
F
Nishio
K
K
Perego
R
R
Qin
Z
Z
Schädel
M
M
Schausten
B
B
Schimpf
E
E
Schuber
R
R
Semchenkov
A
A
Thörle
P
P
Türler
A
A
Wegrzecki
M
M
Wierczinski
B
B
Yakushev
A
A
Yeremin
A
A