Nuclear Spins and Moments of Ga Isotopes Reveal Sudden Structural Changes between N=40 and N=50
- Cheal, B
- Mane, E
- Billowes, J
- Bissell, ML
- Blaum, K
- Brown, BA
- Charlwood, FC
- Flanagan, KT
- Forest, DH
- Geppert, C
- Honma, M
- Jokinen, A
- Kowalska, M
- Krieger, A
- Kraemer, J
- Moore, ID
- Neugart, R
- Neyens, Gerda
- Noertershaeuser, W
- Schug, M
- Stroke, HH
- Vingerhoets, Pieter
- Yordanov, DT
- Zakova, M
Publication date
June 2010
DOI Publisher
American Physical Society (APS) Journal
Physical Review LettersAbstract
Collinear laser spectroscopy was performed on Ga (Z = 31) isotopes at ISOLDE, CERN. A gas-filled linear Paul trap (ISCOOL) was used to extend measurements towards very neutron-rich isotopes (N = 36-50). A ground state (g.s.) spin I = 1/2 is measured for Ga-73, being near degenerate with a 3/2(-) isomer (75 eV less than or similar to E-ex less than or similar to 1 keV). The Ga-79 g.s., with I = 3/2, is dominated by protons in the pi f(5/2) orbital and in Ga-81 the 5/2(-) level becomes the g.s. The data are compared to shell-model calculations in the f(5/2)pg(9/2) model space, calling for further theoretical developments and new experiments.status: publishe
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