The structure of low-lying 1(-) states in Zr-90,Zr-94 from (alpha, alpha 'gamma) and (p, p 'gamma) reactions
文献类型：期刊论文
| 作者 | Crespi, F. C. L.11,12; Bracco, A.11,12; Lanza, E. G.13; Tamii, A.14; Blasi, N.12; Camera, F.11,12; Wieland, O.12; Aoi, N.14; Balabanski, D. L.15; Bassauer, S.16 |
| 刊名 | PHYSICS LETTERS B
 |
| 出版日期 | 2021-05-10 |
| 卷号 | 816页码:7 |
| ISSN号 | 0370-2693 |
| 关键词 | Nuclear structure Dipole excitation around neutron threshold Inelastic scattering |
| DOI | 10.1016/j.physletb.2021.136210 |
| 通讯作者 | Bracco, A.(Angela.Bracco@mi.infn.it) |
| 英文摘要 | The low-lying dipole strength in the Zr-90,Zr-94 nuclei was investigated via (p, p'gamma) at 80 MeV and (alpha, alpha'gamma) at 130 MeV. The experiments, made at RCNP, used the magnetic spectrometer Grand Raiden for the scattered particles and the array CAGRA with HPGe detectors for the gamma-decay. For Zr-94 these are the first data for both reactions and for Zr-90 these are the first data with (p, p'gamma) and the first ones at high resolution for (alpha, alpha'gamma). The comparison of the present results for the two nuclei with existing (gamma, gamma') data shows that both nuclear probes produce an excitation pattern different than that of the electromagnetic probes. DWBA calculations were made using form factors deduced from transition densities, based on RPA calculations, characterized by a strong neutron component at the nuclear surface. A combined analysis of the two reactions was performed for the first time to investigate the isoscalar character of the 1(-) states in Zr-90,Zr-94. The (p, p'gamma) cross section was calculated using values for the isoscalar electric dipole energy-weighted sum rule (E1 ISEWSR) obtained from the (alpha, alpha'gamma) data. The isoscalar strength for Zr-90 was found to exhaust 20 +/- 2.5% of the EWSR in the energy range up to 12 MeV. In case of Zr-94, a strength of 9 +/- 1.1% of the EWSR was found in the range up to 8.5 MeV. Although an overall general description was obtained in the studied energy intervals, not all proton cross sections were well reproduced using the isoscalar strength from (alpha, alpha'gamma). This might suggest mixing of isoscalar and isovector components and that this mixing and the degree of collectivity are not the same for all the 1(-) states below the particle binding energy. (C) 2021 The Authors. Published by Elsevier B.V. |
| WOS关键词 | PYGMY DIPOLE RESONANCE ; INELASTIC-SCATTERING ; GAMMA-DECAY ; ISOSCALAR ; EXCITATION |
| 资助项目 | Italian Institute of Nuclear Physics (INFN) ; Competitiveness Operational Program for the ELI-NP Project Phase II[1] ; Competitiveness Operational Program for the ELI-NP Project Phase II[1334] ; US National Science Foundation[PHY-1565546] ; US National Science Foundation[PHY-1913554] ; State of Hesse under grant Nuclear Photonics within the LOEWE program ; German DFG[SFB 1245] ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)[SFB 1245] ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)[279384907] ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)[510/7-1] ; EU Development Fund |
| WOS研究方向 | Astronomy & Astrophysics ; Physics |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000647421500050 |
| 资助机构 | Italian Institute of Nuclear Physics (INFN) ; Competitiveness Operational Program for the ELI-NP Project Phase II ; US National Science Foundation ; State of Hesse under grant Nuclear Photonics within the LOEWE program ; German DFG ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) ; EU Development Fund |
| 源URL | [http://119.78.100.186/handle/113462/137370]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Bracco, A. |
| 作者单位 | 1.Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa 2.Inst for Basic Sci Korea, Rare Isotope Sci Project, Daejeon 305811, South Korea 3.Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan 4.Univ Tokyo, Ctr Nucl Study, Tokyo 1130033, Japan 5.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 6.Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA 7.GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany 8.Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA 9.Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA 10.Michigan State Univ, Ctr Evolut Elements, Joint Inst Nucl Astrophys, E Lansing, MI 48824 USA |
| 推荐引用方式 GB/T 7714 | Crespi, F. C. L.,Bracco, A.,Lanza, E. G.,et al. The structure of low-lying 1(-) states in Zr-90,Zr-94 from (alpha, alpha 'gamma) and (p, p 'gamma) reactions[J]. PHYSICS LETTERS B,2021,816:7. |
| APA | Crespi, F. C. L..,Bracco, A..,Lanza, E. G..,Tamii, A..,Blasi, N..,...&Zilges, A..(2021).The structure of low-lying 1(-) states in Zr-90,Zr-94 from (alpha, alpha 'gamma) and (p, p 'gamma) reactions.PHYSICS LETTERS B,816,7. |
| MLA | Crespi, F. C. L.,et al."The structure of low-lying 1(-) states in Zr-90,Zr-94 from (alpha, alpha 'gamma) and (p, p 'gamma) reactions".PHYSICS LETTERS B 816(2021):7. |
入库方式： OAI收割
来源：近代物理研究所
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