Experiments with thermalized rare isotope beams from projectile fragmentation: a precision mass measurement of the superallowed beta emitter 38Ca.
The mass of the short-lived radio nuclide 38Ca (T(1/2) = 440 ms) has been measured with the 9.4-T Penning trap mass spectrometer of the Low-Energy Beam and Ion Trap Facility. A mass uncertainty of deltam = 280 eV has been achieved, corresponding to deltam/m = 8 x 10(-9). The result makes 38Ca, a superallowed beta emitter, a new candidate to test the conserved-vector-current hypothesis. The experiment is also the first demonstration that short-lived radioactive isotopes produced by projectile fragmentation of relativistic heavy-ion beams can be slowed down and prepared such that precision experiments of this kind are possible.
Bollen
G
G
National Superconducting Cyclotron Laboratory. Michigan State University, East Lansing, Michigan, USA. bollen@nscl.msu.edu
Davies
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Facina
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Huikari
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Kwan
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Lofy
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Morrissey
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Prinke
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Ringle
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Savory
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Schury
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Schwarz
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Sumithrarachchi
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Weissman
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