First Observation of Proton Emission from {sup 117}La

Conference · Sun Dec 31 04:00:00 EST 2000

OSTI ID:783799

Soramel, F; Guglielmetti, A; Stroe, L; Muller, L; Bonetti, R; Malerba, F; Poli, G L; Boiano, C; Andrighetto, A; Li, Z C; Scarlassara, F; Signorini, C; Dal Bello, A; Isocrate, R; Liu, Z H; Ruan, M; Ivascu, M; Bednarczyk, P; Broude, C

We report the first measurement, at the XTU Tandem + LINAC accelerator of the Laboratori Nazionali di Legnaro, of the decay of the very neutron deficient nucleus {sup 117}La using a 310 MeV {sup 58}Ni beam on a {sup 64}Zn target; the {sup 117}La nucleus was populated via the (p,4n) evaporation channel. The Recoil Mass Spectrometer (RMS) was used to select M/q = 117/30 recoils that were implanted in a (40x40) mm{sup 2} Double Sided Silicon Strip Detector (DSSD) detector. The analysis has revealed that {sup 117}La decays to {sup 116}Ba via proton emission with E{sub p} = (783{+-}6)keV and T{sub 1/2} = (20{+-}5) ms. From this result deformation parameters of {beta}{sub 2} = 0.3 and {beta}{sub 4} = 0.1 have been deduced for the {sup 117}La ground state which was assigned to J{sup {pi}} = 3/2{sup +}.

• Research Organization: Physics Department and INFN University of Udine, Udine (IT); General Physics Institute and INFN University of Milan, Milan (IT); Physics Department and INFN University of Padua, Padua (IT); INFN - Laboratori Nazionali di Legnaro, Legnaro (IT); NIPNE, Bucharest (RO); IFJ Krakow, Krakow (PL); CIAE Beijing (CN); Weizmann Institute of Science, Rehovot (IL)
• Sponsoring Organization: None (US)
• OSTI ID: 783799
• Report Number(s): None; ISBN 1-56396-937-8; ISSN 0094-243X; CODEN APCPCS; ISBN 1-56396-937-8; ISSN 0094-243X; CODEN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
GROUND STATES
HALF-LIFE
LANTHAN 117
LANTHANUM ISOTOPES
LINEAR ACCELERATORS
MASS SPECTROMETERS
NEUTRONS
NICKEL 58 REACTIONS
NUCLEAR DEFORMATION
NUCLEI
PARITY
PROTON-EMISSION DECAY
SPIN
ZINC 64 TARGET