Observation of two-proton radioactivity of 19Mg by tracking the decay products.
We have observed the two-proton radioactivity of the previously unknown (19)Mg ground state by tracking the decay products in-flight. For the first time, the trajectories of the 2p-decay products, (17)Ne+p+p, have been measured by using tracking microstrip detectors which allowed us to reconstruct the 2p-decay vertices and fragment correlations. The half-life of (19)Mg deduced from the measured vertex distribution is 4.0(15) ps in the system of (19)Mg. The Q value of the 2p decay of the (19)Mg ground state inferred from the measured p-p-(17)Ne correlations is 0.75(5) MeV.
Mukha
I
I
Universidad de Sevilla, ES-41012 Seville, Spain. mukha@us.es
Sümmerer
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K
Acosta
L
L
Alvarez
M A G
MA
Casarejos
E
E
Chatillon
A
A
Cortina-Gil
D
D
Espino
J
J
Fomichev
A
A
García-Ramos
J E
JE
Geissel
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H
Gómez-Camacho
J
J
Grigorenko
L
L
Hoffmann
J
J
Kiselev
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O
Korsheninnikov
A
A
Kurz
N
N
Litvinov
Yu
Y
Martel
I
I
Nociforo
C
C
Ott
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W
Pfutzner
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M
Rodríguez-Tajes
C
C
Roeckl
E
E
Stanoiu
M
M
Weick
H
H
Woods
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PJ