| 1. |
- Algora, A., et al.
(author)
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Pronounced Shape Change Induced by Quasiparticle Alignment
- 2000
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In: Physical Review C (Nuclear Physics). - 0556-2813 .- 1089-490X. ; 61:3
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Journal article (peer-reviewed)abstract
- Mean lifetimes of high-spin states of Kr-74 have been determined using the Doppler-shift attenuation method. The high-spin states were studied using the Ca-40(Ca-40, alpha 2p) reaction at a beam energy of 160 MeV with the GASP gamma-ray spectrometer. The ground-state band and negative parity side band show the presence of three different configurations in terms of transitional quadrupole deformations. A dramatic shape change was found along the ground-state band after the S-band crossing. The deduced quadrupole deformation changes are well reproduced by cranked Woods-Saxon Strutinsky calculations.
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| 2. |
- De Angelis, G., et al.
(author)
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Collective Excitations in the Vicinity of N=Z
- 1999. - 1 SUPPL. 1
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In: Proceedings INPC 1998. - 0375-9474. ; 654, s. 659-662
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Conference paper (peer-reviewed)abstract
- In our contribution to the INPC98 conference we reported on the experimental investigation of high spin collective states in medium and heavy mass N≈Z nuclei at LNL. The main purpose is to set light on the role of the proton-neutron interaction in the collective behavior of the nucleus. In medium mass N=Z nuclei, in contrast with the stable nuclei, valence protons and neutrons occupy the same orbitals and one may expect a reinforcement of neutron-proton T=0 (np) pairing correlations[1]. In this interesting subject, the medium mass N=Z=36 72Kr has been studied and completely reported in [2]. In this proceedings we will concentrate in unpublished results concerning the onset of collectivity on nearly spherical nuclei in the 100Sn region. In nuclei with Z=50 and Z=49 dipole bands have been found indicating the presence of "Magnetic Rotation" [3].
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| 3. |
- Palacz, M, et al.
(author)
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In beam gamma-ray spectroscopy of very neutron deficient odd-cadmium isotopes
- 1997
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In: Acta Physica Polonica B. - : ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS. - 0587-4254 .- 1509-5770. ; 28:1-2, s. 309-313
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Journal article (peer-reviewed)abstract
- Excited states in the very neutron deficient odd cadmium isotopes Cd-99, Cd-101 and Cd-103 are discussed in terms of the nuclear shell model. Systematics of excited states in Cd99-109 is presented.
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| 4. |
- Sohler, D, et al.
(author)
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Band-terminating states in Ag-101
- 2004
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In: Nuclear Physics, Section A. - : Elsevier BV. - 0375-9474 .- 1873-1554. ; 733:1-2, s. 37-52
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Journal article (peer-reviewed)abstract
- Excited states of the neutron deficient Ag-101 nucleus have been investigated via the Cr-50(Ni-58, 3rho1alpha) heavy-ion induced reaction at 261 meV by use of in-beam spectroscopic methods. On the basis of the measured gammagamma-cincidence relations and angular distribution ratios high-spin bands have been extended up to I-pi = 35/2(+), 45/2((-)) and (49/2(-)). The negative parity states at the highest energy have been interpreted as terminating non-collective oblate states in the framework of the Nilsson-Strutinsky cranking formalism.
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| 5. |
- Sohler, D, et al.
(author)
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Maximally aligned states in Ag-99
- 2003
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In: European Physical Journal A. Hadrons and Nuclei. - : Springer Science and Business Media LLC. - 1434-6001 .- 1434-601X. ; 16:2, s. 171-175
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Journal article (peer-reviewed)abstract
- Excited states of Ag-99 were populated via the Cr-50 + Ni-58 (261 MeV) reaction using the NORDBALL detector array equipped with charged-particle and neutron. detector systems for reaction channel separation. On the basis of the measured gammagamma-coincidence relations and angular distribution ratios a significantly extended level scheme has been constructed up to E-x similar to 7.8 MeV and I = 35/2. The experimental results were described within the framework of the shell model. Candidates for states fully aligned in the pig(9/2)(-3)nu(d(5/2),g(7/2))(2) valence configuration space were found at 4109 and 6265 keV.
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| 6. |
- Sohler, D, et al.
(author)
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Spectroscopy of neutron deficient Ge-65
- 1997
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In: Zeitschrift für Physik A Hadrons and Nuclei. - : Springer Science and Business Media LLC. - 0939-7922 .- 1431-5831. ; 357:3, s. 239-240
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Journal article (peer-reviewed)abstract
- Excited states of 65Ge were populated via the 12C + 58Ni (261 MeV) reaction using the NORDBALL detector array equipped with charged-particle and neutron detector systems for reaction channel separation. On the basis of γγ-coincidence relations and angular distribution ratios a significantly extended level scheme was constructed up to E x = 9 MeV and J π = (33/2−). The low-energy states of the nucleus are discussed in the framework of the interacting boson-fermion model.
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| 7. |
- de, Angelis G, et al.
(author)
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Band crossing phenomena in N = Z nuclei - A probe to T = 0 pairing correlations?
- 1997
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In: ACTA PHYSICA HUNGARICA NEW SERIES-HEAVY ION PHYSICS. - : AKADEMIAI KIADO. ; 6:1-4, s. 269-273
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Journal article (other academic/artistic)abstract
- The structure of the N = Z nuclei Zn-60, Ga-62, Ge-64 and Kr-72 has been investigated at GASP. Total Routhian surface (TRS) calculations have been performed for the N = 36, 38 and 40 Kr isotones. In the case of Kr-72 the four quasi-particle g(9/2) alignme
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| 8. |
- de, Angelis G, et al.
(author)
-
Rotation induced octupole correlations in the neutron-deficient Te-109 nucleus
- 1998
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In: Physics Letters B. - 0370-2693 .- 1873-2445. ; 437:3-4, s. 236-242
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Journal article (peer-reviewed)abstract
- High spin states in the neutron deficient nucleus 109Te have been populated with the 58Ni+54Fe reaction at 220 MeV and investigated through γ-spectroscopy methods at the GASP spectrometer making use of reaction channel selection with the ISIS Si-ball. The level scheme has been extended up to an excitation energy of ≈12.1 MeV. The spins and parities of the observed levels are assigned tentatively supporting the identification of two bands of opposite parity connected by strong dipole transitions inferred to be of E1 character. Octupole correlations in 109Te induced by rotation are suggested as the cause of this effect.
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| 9. |
- de, Angelis G, et al.
(author)
-
T=0 pairing correlations and band crossing phenomena in N=Z nuclei
- 1998
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In: NUCLEAR PHYSICS A. - : ELSEVIER SCIENCE BV. ; 630:1-2, s. 426C-433C
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Journal article (other academic/artistic)abstract
- The structure of the N=Z nuclei Zn-60, Ga-62, Ge-64 and Kr-72 has been investigated at GASP spectrometer through the S-32 + Ca-40 and Ca-40 + Ca-40 reactions at 140 and 160 MeV, respectively, using reaction channel selection with the ISIS Si-ball. The hig
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| 10. |
- Kownacki, J, et al.
(author)
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High-spin studies of the neutron deficient nuclei In-103, In-105, In-107, and In-109
- 1997
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In: Nuclear Physics A. - 0375-9474 .- 1873-1554. ; 627:2, s. 239-258
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Journal article (peer-reviewed)abstract
- High-spin states of the isotopes 103,105,107,109In have been investigated using in-beam γ-ray spectroscopic methods. Results from three different experiments are presented. Targets of 54Fe, 50Cr, and 92Mo were bombarded by a 270 and 261 MeV 58Ni beam and by a 95 MeV 19F beam, respectively. Reaction channel separation was achieved with a charged-particle detector array and in the first two experiments also with a 1π neutron detector system. As a result of these experiments the level schemes of 103,105,107,109In were significantly extended. Excited states of these odd-A indium isotopes are discussed within the framework of the nuclear shell model and the hole-core coupling scheme. The systematics of excited states of light odd-A indium isotopes is also discussed.
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