Approaching complete low-spin spectroscopy of $^{210}$Bi 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

Approaching complete low-spin spectroscopy of $^{210}$Bi with a cold-neutron capture reaction

N. Cieplicka-Oryńczak B. Fornal S. Leoni D. Bazzacco A. Blanc ¹ G. Bocchi S. Bottoni G. de France ² M. Jentschel ¹ U. Köster ¹ P. Mutti ¹ G. Simpson ³ T. Soldner ¹ B. Szpak C. Ur W. Urban

1 ILL - Institut Laue-Langevin

2 GANIL - Grand Accélérateur National d'Ions Lourds

3 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

Abstract : The low-spin structure of the 210Bi nucleus was investigated in the neutron capture experiment 209Bi(n,γ )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 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 210Bi. 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 208Pb core. It has been found that while up to the energy of ∼2 MeV each state observed in 210Bi 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 208Pb core and may serve as a testing ground for models which describe single particle-phonon excitations.

Keywords : EXILL EXOGAM

Document type :

Journal articles

Domain :

Physics [physics] / Nuclear Experiment [nucl-ex]

Complete list of metadatas

http://hal.in2p3.fr/in2p3-01310737
Contributor : Michel Lion <>
Submitted on : Tuesday, May 3, 2016 - 10:07:01 AM
Last modification on : Tuesday, May 22, 2018 - 9:48:11 PM

Approaching complete low-spin spectroscopy of $^{210}$Bi with a cold-neutron capture reaction

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Approaching complete low-spin spectroscopy of $^{210}$Bi with a cold-neutron capture reaction

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