Recent results of decay spectroscopy at RIBF
The neutron-rich nuclei 109Nb and 110Mo have been investigated by means of β-γ and isomer spectroscopy following in-flight fission of a 238U beam at 345 MeV/nucleon at the RIBF facility. A T1/2 = 150(30) ns isomer at 313 keV has been identified in 109Nb. The low-lying levels in 109Nb have been also populated following the β-decay of 109Zr. The observed hindrances of the electromagnetic transitions deexciting the isomeric state are discussed in terms of possible shape coexistence. For 110Mo, spectroscopic information on the low-lying levels of the quasi-γ band built on the 22+ state at 494 keV has been obtained for the first time. The experimental finding of the 22+ state being lower than the 41+ level suggests that axially-asymmetric γ softness is substantially enhanced in this nucleus. The experimental results are compared with model calculations based on the general Bohr Hamiltonian method. A new project of decay spectroscopy at RIBF, named EURICA, is also introduced..
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2013 |
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| Erschienen: |
2013 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:63, p 01001 |
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| Enthalten in: |
EPJ Web of Conferences - 63, p 01001(2013) |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Watanabe Hiroshi [VerfasserIn] |
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| Links: |
doi.org [kostenfrei] |
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| Themen: |
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| doi: |
10.1051/epjconf/20136301001 |
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| PPN (Katalog-ID): |
DOAJ050049135 |
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| 520 | |a The neutron-rich nuclei 109Nb and 110Mo have been investigated by means of β-γ and isomer spectroscopy following in-flight fission of a 238U beam at 345 MeV/nucleon at the RIBF facility. A T1/2 = 150(30) ns isomer at 313 keV has been identified in 109Nb. The low-lying levels in 109Nb have been also populated following the β-decay of 109Zr. The observed hindrances of the electromagnetic transitions deexciting the isomeric state are discussed in terms of possible shape coexistence. For 110Mo, spectroscopic information on the low-lying levels of the quasi-γ band built on the 22+ state at 494 keV has been obtained for the first time. The experimental finding of the 22+ state being lower than the 41+ level suggests that axially-asymmetric γ softness is substantially enhanced in this nucleus. The experimental results are compared with model calculations based on the general Bohr Hamiltonian method. A new project of decay spectroscopy at RIBF, named EURICA, is also introduced. | ||
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