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| 2. |
- DORING, J, et al.
(author)
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EVIDENCE FOR NEW ISOMERS AND BAND STRUCTURES IN RB-80
- 1992
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In: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 46:6, s. R2127-R2131
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Journal article (peer-reviewed)abstract
- Excited states in the doubly odd nucleus Rb-80 have mainly been studied via the Zn-68(F-19,alpha3n) reaction at 72 MeV beam energy utilizing the NORDBALL detector system. The level scheme has been extended up to a (15+) state at 4446 keV excitation energy. In the low-spin region seven new isomers with lifetimes in the nanosecond region have been found. In addition, a 6+ isomer with a half-life of the order of mus has been identified at an excitation energy of 494.4 keV. For the level sequence built on this isomer positive parity is suggested and the states are ascribed to the intruder two-quasiparticle configuration (pig9/2 x nug9/2) and collective excitations.
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| 3. |
- DORING, J, et al.
(author)
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HIGH-LYING 3-QUASI-PARTICLE BANDS AND SIGNATURE SPLITTING IN RB-81
- 1994
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In: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 50:4, s. 1845-1850
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Journal article (peer-reviewed)abstract
- Two new high-lying level sequences of negative parity have been identified in the odd-proton nucleus Rb-81 by in-beam gamma-ray spectroscopy using the reactions Br-79(alpha, 2n) at 27 MeV and Zn-68(F-19, alpha2n) at 72 MeV. One sequence, dominated by M1 transitions, is interpreted as a three-quasiparticle band predominantly containing a neutron in the p1/2, p3/2, or f5/2 subshell coupled to g9/2 proton and g9/2 neutron excitations. The other new level sequence forms the three-quasiparticle extension of the unfavored negative-parity band, but the states decay also by E1 transitions. The signature splitting points to a configuration where an aligned g9/2 proton pair is involved.
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| 4. |
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| 5. |
- DOMBRADI, Z, et al.
(author)
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IDENTIFICATION AND SPECTROSCOPY OF THE TE-108 NUCLEUS
- 1994
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In: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922 .- 1431-5831. ; 350:1, s. 3-4
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Journal article (peer-reviewed)abstract
- Excited states of Te-108 were populated in the Fe-54 + Ni-58 (270 MeV) reaction using the NORDBALL detector array equipped with charged-particle and neutron detector systems for reaction channel separation. Gamma rays belonging to the neutron deficient nucleus Te-108 were identified for the first time. On the basis of gammagamma-coincidence and angular correlation relations a level scheme was constructed with tentative spin and parity assignments. The structure of the nucleus is discussed in the framework of systematics of heavier Te nuclei.
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| 6. |
- FAHLANDER, C, et al.
(author)
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IN-BEAM SPECTROSCOPY OF TE-110
- 1994
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In: Nuclear Physics A. - 0375-9474 .- 1873-1554. ; 577:3-4, s. 773-785
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Journal article (peer-reviewed)abstract
- The neutron-deficient nucleus Te-110 has been investigated by in-beam spectroscopic methods using the NORDBALL multi-detector array. Except for the energy of one level observed in alpha-decay, excited states in Te-110 were previously unknown. The level scheme constructed from gamma gamma-coincidence relationships is presented with tentative spin assignments up to I-pi = 21(-). Above spin 8(+) the yrast states have negative parity. They are most likely the members of a band predominantly based on the nu(h(11/2)g(7/2)) two-quasiparticle configuration. A band crossing is observed at I-pi approximate to 17(-). It is suggested to be caused by the alignment of two h(11/2) neutrons. The cranked shell model correctly predicts the spin alignment, but fails to reproduce the observed band crossing frequency, possibly because of octupole effects.
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| 7. |
- JOHNSON, A, et al.
(author)
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HIGH-SPIN STUDIES NEAR SN-100 WITH NORDBALL - NEW RESULTS ON IN-102, IN-104 AND SB-108
- 1993
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Conference paper (peer-reviewed)abstract
- The NORDBALL detector array has been used in a gamma-ray spectroscopic study of neutron deficient nuclei close to 100Sn. A beam of 270 MeV 58Ni ions was used to bombard a target of Fe-54. Reaction channel separation was achieved with a 4pi charged particle Si-ball together with a 1pi neutron detector wall. Altogether 29 final nuclei were identified and excited states were observed for the first time in 8 of them. The weakest identified channel was 100Cd which represented 4.10(-3) % of the observed total yield. Level schemes Of 102In, 104In and 108Sb constructed from gamma-gamma-particle-coincidence and gamma-gamma-angular correlation analyses are presented. The observed structures are discussed in the framework of the nuclear shell-model. In 108Sb also a deformed, strongly coupled, level sequence is observed. This deformed structure is interpreted as built on a pig9/2(-1)xnuh11/2 configuration in agreement with TRS calculations.
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| 8. |
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| 9. |
- KARNY, M, et al.
(author)
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EXCITED-STATES OF I-111 AND THE OBSERVATION OF A 21-NS ISOMER
- 1994
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In: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922 .- 1431-5831. ; 350:3, s. 179-180
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Journal article (peer-reviewed)abstract
- Proton rich nuclei close to Sn-100 have been investigated an-beam using the NORDBALL detector array. A beam of 270 MeV Ni-58 was used to bombard a Fe-54 target. Reaction channel separation was achieved with a 4 pi charged particle multi-detector set-up together with a 1 pi neutron detector wall placed in the forward direction. Gamma-ray transitions belonging do the I-111 nucleus were identified for the first time. A level scheme constructed from gamma-gamma-perticle-coincidence analysis is proposed. The level structure is discussed within the framework of the shell model and the systematics of the heavier odd iodine nuclei.
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| 10. |
- KOMATSUBARA, T, et al.
(author)
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HIGH-SPIN STATES IN ODD-ODD NUCLEI
- 1993
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Conference paper (peer-reviewed)abstract
- High-spin states in doubly odd nuclei of 124Cs, 126Cs and 124La have been investigated by gamma ray spectroscopy. Rotational bands of pih11/2 x nuh11/2 configuration have been assigned by the blocking argument on the first band crossing frequencies for neighboring odd-A nuclei. In cesium isotopes, the signature inversion of quasiparticle routhians has been observed. The spin of the band head in 124Cs has been determined to be (7+) by means of spectroscopic method. This spin assignment implies that the signature inversion occurs at low spin. The signature dependence becomes normal at higher spins than 17hBAR. The occurrence of the signature inversion in the A approximately 130 mass region is discussed by comparing excitation energies, transition intensities and the shell-model orbits of valence nucleons with those of rare-earth nuclei.
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