The low-spin structure of the Bi210 nucleus was investigated in the neutron capture experiment Bi209(n,γ)Bi210 performed at ILL Grenoble at the PF1B cold-neutron facility. By using the EXILL multidetector array, consisting of 46 high-purity germanium crystals, and γγ-coincidence technique, 64 primary γ rays were observed (40 new) and a total number of 70 discrete states (33 new) were located below the neutron binding energy in Bi210. The analysis of the angular correlations of γ 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 Pb208 core. It has been found that while up to the energy of ∼2 MeV each state observed in Bi210 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 Pb208 core and may serve as a testing ground for models which describe single particle-phonon excitations.

Approaching complete low-spin spectroscopy of Bi 210 with a cold-neutron capture reaction / N. Cieplicka-Oryńczak, B. Fornal, S. Leoni, D. Bazzacco, A. Blanc, G. Bocchi, S. Bottoni, G. De France, M. Jentschel, U. Köster, P. Mutti, G. Simpson, T. Soldner, B. Szpak, C. Ur, W. Urban. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 93:5(2016), pp. 054302.1-054302.22.

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

S. Leoni;G. Bocchi;S. Bottoni;
2016

Abstract

The low-spin structure of the Bi210 nucleus was investigated in the neutron capture experiment Bi209(n,γ)Bi210 performed at ILL Grenoble at the PF1B cold-neutron facility. By using the EXILL multidetector array, consisting of 46 high-purity germanium crystals, and γγ-coincidence technique, 64 primary γ rays were observed (40 new) and a total number of 70 discrete states (33 new) were located below the neutron binding energy in Bi210. The analysis of the angular correlations of γ 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 Pb208 core. It has been found that while up to the energy of ∼2 MeV each state observed in Bi210 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 Pb208 core and may serve as a testing ground for models which describe single particle-phonon excitations.
Nuclear and High Energy Physics
Settore FIS/01 - Fisica Sperimentale
Article (author)
File in questo prodotto:
File Dimensione Formato  
PRC93-Cieplicka-2016-054302.pdf

accesso aperto

Tipologia: Publisher's version/PDF
Dimensione 1.31 MB
Formato Adobe PDF
1.31 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/511722
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 16
  • ???jsp.display-item.citation.isi??? 16
social impact