Approaching complete low-spin spectroscopy of 210Bi with a cold-neutron capture reaction

被引：19

作者：

Cieplicka-Orynczak, N. ^{[1
,2
]}

Fornal, B. ^{[2
]}

Leoni, S. ^{[1
,3
]}

Bazzacco, D. ^{[4
,5
]}

Blanc, A. ^{[6
]}

Bocchi, G. ^{[3
]}

Bottoni, S. ^{[3
]}

de France, G. ^{[7
]}

Jentschel, M. ^{[6
]}

Koster, U. ^{[6
]}

Mutti, P. ^{[6
]}

Simpson, G. ^{[8
]}

Soldner, T. ^{[6
]}

Szpak, B. ^{[2
]}

Ur, C. ^{[9
]}

Urban, W. ^{[10
]}

机构：

[1] Ist Nazl Fis Nucl, Sez Milano, Via Celoria 16, I-20133 Milan, Italy

[2] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland

[3] Univ Milan, Via Celoria 16, I-20133 Milan, Italy

[4] Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy

[5] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[6] Inst Laue Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble 9, France

[7] GANIL, Blvd Becquerel,BP 55027, F-14076 Caen 05, France

[8] Univ Grenoble 1, CNRS, IN2P3, Inst Natl Polytech Grenoble,LPSC, F-38026 Grenoble, France

[9] Ist Nazl Fis Nucl, Sez Padova, Via F Marzolo 8, I-35131 Padua, Italy

[10] Univ Warsaw, Fac Phys, Ulica Hoza 69, PL-02681 Warsaw, Poland

来源：

PHYSICAL REVIEW C | 2016年 / 93卷 / 05期

关键词：

STATES;

D O I：

10.1103/PhysRevC.93.054302

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The low-spin structure of the Bi-210 nucleus was investigated in the neutron capture experiment Bi-209(n, gamma) 210Bi performed at ILL Grenoble at the PF1B cold-neutron facility. By using the EXILL multidetector array, consisting of 46 high-purity germanium crystals, and gamma gamma-coincidence technique, 64 primary gamma rays were observed (40 new) and a total number of 70 discrete states (33 new) were located below the neutron binding energy in Bi-210. The analysis of the angular correlations of gamma rays provided information about transitions multipolarities, which made it possible to confirm most of the previously known spin-parity assignments and helped establish new ones. The obtained experimental results were compared to shell-model calculations involving one-valence-proton, one-valence-neutron excitations outside the Pb-208 core. It has been found that while up to the energy of similar to 2 MeV each state observed in Bi-210 has its calculated counterpart; at higher excitation energies some levels cannot be described by the valence particle couplings. These states may arise from couplings of valence particles to the 3(-) octupole phonon of the doubly magic Pb-208 core and may serve as a testing ground for models which describe single particle-phonon excitations.

引用

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