24 research outputs found
New mass measurements of neutron-rich nuclei near N = 20
International audienceThe masses of 39 neutron-rich nuclei in the mass range 17–37 have been measured using a direct time-of-flight technique following the fragmentation of a 48Ca beam at 55 MeV/nucleon. The masses of 29,30Ne, 34,35Mg and 36,37Al are reported for the first time. The very neutron-rich nuclei, 31–33Na, are found to be 2–4 MeV less bound than previously believed. A comparison is made with recently available large scale shell model calculations encompassing the deformed A∼32 nuclei. Conclusions are drawn regarding the extent of the region of deformation, which is found to include 30Ne
Mass measurements of neutron-rich nuclei via fragmentation of Ca beam at 55 MeV/A
International audienc
First observation of the neutron-rich nuclei42Si,45, 46P,48S, and51Cl from the interaction of 44 MeV/u48Ca +64Ni
Five new very neutron-rich isotopes, 42Si,45,46p, 48 S and 51CI, are identiled from the interaction of a 44 MeV/b 48Ca beam with a 64Ni target
Mass measurements of neutron-rich nuclei via fragmentation of Ca beam at 55 MeV/A
International audienc
Shape coexistence and the \mth{N=20} shell closure far from stability by inelastic scattering
Following mass measurements in
the region and , we
have studied inelastic nuclear scattering
for the nuclei Si, Al and Mg.
No evidence for a low-lying shape isomeric
0 state was found in Si,
and an upper limit for the population cross-section
could be established, rendering its existence very unlikely.
A new transition was found in
Al, that is a good candidate for a 2p-2h state
and therefore a determination of the 2p-2h gap at .
Inelastic nuclear scattering strongly excites 3 states,
as seen in Si.
A strong transition was found in Mg that should
correspond to the first 3 in this nucleus, lying
very low as compared to theory and systematics
in this region