| 1. |
- Hadinia, B., et al.
(författare)
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IN-BEAM gamma-RAY SPECTROSCOPY ABOVE THE HIGH-SPIN ISOMERIC STATE IN Lu-155
- 2013
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Ingår i: CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS. - : WORLD SCIENTIFIC PUBL CO PTE LTD. ; , s. 139-144
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Konferensbidrag (refereegranskat)abstract
- Excited states in Lu-155 have been studied at the Accelerator Laboratory of the University of Jyvaskyla in Finland. The Lu-155 nuclei were populated using the reaction of Ni-58 on (102)pd at a beam energy of 280 MeV. The nuclei of interest were selected using the RITU gas filled recoil separator and the prompt gamma rays belonging to 155Lu were identified using the recoil-decay tagging technique. The gamma-ray transitions de-exciting the excited states above the high-spin isomeric a-decaying state in Lu-155 have been identified. A gamma-ray coincidence analysis shows that the previously reported level scheme for Lu-155 should be revised.
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| 2. |
- Qi, Chong, 1983-
(författare)
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alpha FORMATION PROBABILITIES IN NUCLEI AND PAIRING COLLECTIVITY
- 2010
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Ingår i: NUCLEAR STRUCTURE IN CHINA 2010. - : WORLD SCIENTIFIC PUBL CO PTE LTD. ; , s. 169-174
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Konferensbidrag (refereegranskat)abstract
- alpha formation amplitudes extracted from experimental data are presented and an abrupt change around the N = 126 shell closure is noted. It is explained as a sudden hindrance of the clustering of nucleons. The clustering induced by the pairing mode acting upon the four nucleons is inhibited if the configuration space does not allow a proper manifestation of the pairing collectivity.
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| 3. |
- Qi, Chong, 1983-, et al.
(författare)
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Coherence features of the spin-aligned neutron-proton pair coupling scheme
- 2012
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Ingår i: Physica scripta. T. - 0281-1847. ; T150, s. 014031-
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Tidskriftsartikel (refereegranskat)abstract
- The seniority scheme has been shown to be extremely useful for the classification of nuclear states in semi-magic nuclei. The neutron-proton (np) correlation breaks the seniority symmetry in a major way. As a result, the corresponding wave function is a mixture of many components with different seniority quantum numbers. In this paper, we show that the np interaction may favor a new kind of coupling in N = Z nuclei, i.e. the so-called isoscalar spin-aligned np pair mode. Shell model calculations reveal that the ground and low-lying yrast states of the N = Z nuclei Pd-92 and Cd-96 may be mainly built upon such spin-aligned np pairs, each carrying the maximum angular momentum J = 9 allowed by the shell 0 g(9/2) which is dominant in this nuclear region.
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| 4. |
- Qi, Chong, 1983-, et al.
(författare)
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Competition of different coupling schemes in atomic nuclei
- 2012
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Ingår i: Advanced Many-Body And Statistical Methods In Mesoscopic Systems. - : Institute of Physics Publishing (IOPP). ; , s. 012027-
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Konferensbidrag (refereegranskat)abstract
- Shell model calculations reveal that the ground and low-lying yrast states of the N = Z nuclei Pd-92(46) and Cd-96 are mainly built upon isoscalar spin - aligned neutron - proton pairs each carrying the maximum angular momentum J = 9 allowed by the shell 0g(9)/(2) which is dominant in this nuclear region. This mode of excitation is unique in nuclei and indicates that the spin - aligned pair has to be considered as an essential building block in nuclear structure calculations. In this contribution we will discuss this neutron - proton pair coupling scheme in detail. In particular, we will explore the competition between the normal monopole pair coupling and the spin - aligned coupling schemes. Such a coupling may be useful in elucidating the structure properties of N = Z and neighboring nuclei.
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| 5. |
- Qi, Chong, 1983-, et al.
(författare)
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Generalization of the Geiger-Nuttall law and alpha clustering in heavy nuclei
- 2012
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Ingår i: Journal of Physics, Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 381, s. 012131-
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Tidskriftsartikel (refereegranskat)abstract
- A generalization of the Geiger-Nuttall law is deduced, which is valid for the radioactivity of all clusters (including alpha particles), by considering the clusterization and subsequent decay of nucleons within the nucleus. This universal decay law (UDL) is a linear relation between the half-lives of the decaying clusters and the corresponding Q-values. In this universal decay law (UDL) the penetrability is still a dominant quantity. By using three free parameters only, one finds that all known ground state to ground state radioactive decays are explained rather well. This allows us to search for new cluster decay modes and to carry out a simple and model-independent study of the decay properties of nuclei over the whole nuclear chart. It also helps in distinguishing the role played by pairing collectivity in the clustering process in heavy nuclei.
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| 6. |
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| 7. |
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| 8. |
- Qi, Chong, 1983-, et al.
(författare)
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Spin-aligned neutron-proton pair coupling in the era of large scale computing
- 2012
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Ingår i: Journal of Physics, Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 381:1, s. 012106-
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Tidskriftsartikel (refereegranskat)abstract
- Shell model calculations reveal that the ground and low-lying yrast states of the N = Z nuclei Pd-92(46) and Cd-96(48) are mainly built upon isoscalar spin-aligned neutron-proton pairs each carrying the maximum angular momentum J = 9 allowed by the shell 0g(9/2) which is dominant in this nuclear region. This mode of excitation is unique in nuclei and indicates that the spin-aligned pair has to be considered as an essential building block in nuclear structure calculations. In this contribution we will discuss this neutron-proton pair coupling scheme in detail. It may help in understanding the intrinsic structure of the shell-model wave function. In particular, we will explore the competition between the normal monopole pair coupling and the spin-aligned coupling schemes.
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| 9. |
- Qi, Chong, 1983-, et al.
(författare)
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Suppression of alpha formation probability around the N = 126 shell closure
- 2011
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Ingår i: Frontiers In Nuclear Structure, Astrophysics, And Reactions (FINUSTAR 3). - : AIP. - 9780735409378 ; , s. 296-300
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Konferensbidrag (refereegranskat)abstract
- alpha formation amplitudes extracted from experimental data are presented and an abrupt change around the N = 126 shell closure is noted. It is explained as a sudden hindrance of the clustering of nucleons. The clustering induced by the pairing mode acting upon the four nucleons is inhibited if the configuration space does not allow a proper manifestation of the pairing collectivity.
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| 10. |
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