Observation of Two-Proton Radioactivity of {sup 19}Mg by Tracking the Decay Products

Journal Article · Fri Nov 02 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.182501· OSTI ID:21024378

Mukha, I; Alvarez, M A. G.; Espino, J; Gomez-Camacho, J ^[1]; Suemmerer, K; Chatillon, A; Geissel, H; Hoffmann, J; Kurz, N; Litvinov, Yu; Nociforo, C; Ott, W; Roeckl, E; Weick, H ^[2]; Acosta, L; Garcia-Ramos, J E; Martel, I ^[3]; Casarejos, E; Cortina-Gil, D; Rodriguez-Tajes, C ^[4]

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1. Universidad de Sevilla, ES-41012 Seville (Spain)
2. Gesellschaft fuer Schwerionenforschung, D-64291 Darmstadt (Germany)
3. Universidad de Huelva, ES-21071 Huelva (Spain)
4. Universidade de Santiago de Compostela, ES-15782 Santiago de Compostela (Spain)

We have observed the two-proton radioactivity of the previously unknown {sup 19}Mg ground state by tracking the decay products in-flight. For the first time, the trajectories of the 2p-decay products, {sup 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 {sup 19}Mg deduced from the measured vertex distribution is 4.0(15) ps in the system of {sup 19}Mg. The Q value of the 2p decay of the {sup 19}Mg ground state inferred from the measured p-p-{sup 17}Ne correlations is 0.75(5) MeV.

• OSTI ID: 21024378
• Journal Information: Physical Review Letters, Vol. 99, Issue 18; Other Information: DOI: 10.1103/PhysRevLett.99.182501; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DAUGHTER PRODUCTS
GROUND STATES
HALF-LIFE
MAGNESIUM 19
NEON 17
NUCLEAR DECAY
PROTONS
Q-VALUE
RADIOACTIVITY