Structure of $^{191}$Pb from α- and β-decay spectroscopy

T E Cocolios (1) , a N Andreyev (1, 2) , S Antalic (3) , A Barzakh (4) , B Bastin (1) , J Büscher (1) , I G Darby (1) , W Dexters (1) , D V Fedorov (4) , V N Fedosseev (5) , K T Flanagan (6, 7) , S Franchoo (8) , G Huber (9) , M Huyse (1) , M Keupers (1) , U Köster (10) , Yu Kudryavtsev (1) , E Mané (11) , B A Marsh (5) , P Molkanov (4) , R D Page (12) , M D Seliverstov (4, 9, 1) , a M Sjoedin (5, 13) , I Stefan (8) , J van de Walle (1, 14) , P van Duppen (1) , M Venhart (1, 15) , S Zemlyanoy (16)

1 Instituut voor Kern- en Stralingsfysica
2 School of Engineering and Science
3 Department of Physics and Biophysics
4 Petersburg Nuclear Physics Institute
5 Engineering Department
6 University of Manchester [Manchester]
7 CSNSM SNO
8 IPNO - Institut de Physique Nucléaire d'Orsay
9 Institut für Physik [Mainz]
10 ILL - Institut Laue-Langevin
11 Department of Physics
12 Oliver Lodge Laboratory
13 KTH - KTH Royal Institute of Technology [Stockholm]
14 ISOLDE
15 Institute of Physics
16 FLNR - Flerov Laboratory of Nuclear Reactions [Dubna]

Complementary studies of 191 Pb have been made in the β decay of 191 Bi at LISOL (CRC) and in the α decay of 195 Po at ISOLDE (CERN). Fine structures in the α decay of the low-spin and high-spin isomers of 195 Po have been fully resolved. Identification of the parent state is made possible via isomer selection based on narrowband laser frequency scanning. The α-particle and γ-ray energies have been determined with greater precision. New α-particle and γ-ray energies are identified. Branching ratios in the decay of 195 Po and 191 Pb have been examined. Structure of 191 Pb from α- and β-decay spectroscopy 2 PACS numbers: 23.20.Nx Internal conversion, 23.60.+e α decay, 27.80.+w 190 ≤ A ≤ 219, 29.38.-c Radioactive beams, 32.10.Fn Fine and hyperfine structure Structure of 191 Pb from α- and β-decay spectroscopy 3

Mots clés: NEUTRON-DEFICIENT PB; CLOSED-SHELL NUCLEI; SHAPE COEXISTENCE; INTRUDER STATES; BRANCHING RATIOS; MASS NUCLEI; ISOTOPES; PO; POLONIUM; NEUTRON-DEFICIENT PB

Domaines: Physique [physics]; Physique Nucléaire Expérimentale [nucl-ex]

T E Cocolios, a N Andreyev, S Antalic, A Barzakh, B Bastin, et al.. Structure of $^{191}$Pb from α- and β-decay spectroscopy. Journal of Physics G: Nuclear and Particle Physics, 2010, 37 (12), pp.125103. ⟨10.1088/0954-3899/37/12/125103⟩. ⟨hal-00600787⟩