Structure of exotic nuclei near and above 208Pb populated via deep-inelastic collisions

Lane, G. J.; Broda, R.; Fornal, B.; Byrne, Aidan; Dracoulis, George; Blomqvist, J.; Clark, R.M.; Cromaz, M.; Deleplanque, M. A.; Diamond, R.M.; Fallon, P.; Janssens, R. V. F.; Lee, I.Y.; Macchiavelli, A. O.; Maier, K. H.; Rejmund, M.; Stephens, F. S.; Svensson, C. E.; Vetter, K.; Ward, D.; Wiedenhöver, I.; Wrzesiński, J.

doi:10.1016/s0375-9474(00)00624-2

Cited by 31 publications

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“…The side-feeding transitions of 250 keV and 516 keV helped fix the ordering of the main cascade, as they were not coincident with the highest decays.The structure of these states is anticipated to be due to the excitation of the neutrons to states above the νg 9/2 level and their coupling to the proton hole. The spectrum of excited neutron states has been experimentally observed in 211 Pb [23]. However, the coupling leads to a myriad of states and our current data on 209 Tl is too statistically marginal to allow any spin assignments which would allow the exact configurations to be inferred.…”

Section: Configurations Above the Isomermentioning

confidence: 82%

“…The fully aligned ν(g 9/2 ) 2 J π = 8 + state in 210 Pb at 1278 keV [23] is isomeric, with a half-life of T 1/2 = 201(17) ns [24], and has reduced matrix element B(E2) = 0.7(3) W.u [25]. The isomerism arises from the fact that the fastest electromagnetic de-excitation is an E2 decay to the J π = 6 + member of the multiplet, which lies only 83(3) keV lower.…”

Section: Resultsmentioning

confidence: 99%

“…The isomerism arises from the fact that the fastest electromagnetic de-excitation is an E2 decay to the J π = 6 + member of the multiplet, which lies only 83(3) keV lower. The J π = 6 + member of the decay cascade in 210 Pb is also isomeric, it decays by a 97(3) keV γ-transition [23] and has a half-life of T 1/2 = 49(6) ns [24] implying B(E2) = 2.1(8) W.u. [25].…”

Section: Resultsmentioning

confidence: 99%

“…The fully aligned ν(g 9/2 ) 2 J π = 8 + state in 210 Pb lies at 1278 keV [23] and has T 1/2 = 201 ns [24]. One may expect a similar isomer in 209 Tl, fully aligned to J π = 17/2 + .…”

Section: F the 1228 Kev T 1/2 =146(10) Ns Isomermentioning

confidence: 96%

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γ -ray spectroscopy of Tl209

et al. 2017

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States in 209 Tl were populated using a multi-nucleon transfer reaction with a 136 Xe beam impinging on a thick 208 Pb target at E = 785 MeV. The beam was pulsed at 825 ns intervals in order to perform isomer decay spectroscopy. The known J π = 17/2 + isomer in 209 Tl was located at 1228(4) keV and measured to have a half-life of T 1/2 = 146(10) ns. A second isomer with J π = 13/2 + was found to have T 1/2 = 14(5) ns. The previously suggested low-energy "X" and "Y" transitions were found to have energies 57(2) and 47(2) keV respectively, while the measurement of conversion coefficients and a new decay path make the spin assignments below the isomers experimentally firm. Correlating the delayed γ-transitions with the prompt beam flash allowed the decay of states above the isomer to be found. The longer-lived isomer represents full alignment of the simplest two-particle, one-hole configuration, and illuminates the remarkably weak coupling of the proton hole to the 210 Pb core.

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Section: Configurations Above the Isomermentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…The fully aligned ν(g 9/2 ) 2 J π = 8 + state in 210 Pb lies at 1278 keV [23] and has T 1/2 = 201 ns [24]. One may expect a similar isomer in 209 Tl, fully aligned to J π = 17/2 + .…”

Section: F the 1228 Kev T 1/2 =146(10) Ns Isomermentioning

confidence: 96%

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γ -ray spectroscopy of Tl209

et al. 2017

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“…However, the bismuth isotopes, one proton above lead, are not all reachable via decay of easy-toproduce heavy nuclei. The 211 Bi isotope has been studied via transfer and fragmentation reactions [1,4,5] and via the β and α decay of 211 Pb and 215 At, respectively [6,7], leading to the discovery of two isomeric states in the same decay sequence. The 213 Bi nucleus has also been studied by α decay of 217 At, and its first excited state, I π = 13/2 − , was observed [8].…”

Section: Introductionmentioning

confidence: 99%

Isomeric decay spectroscopy of theBi217isotope

Gottardo¹,

Lunardi²,

Gadea³

et al. 2014

Phys. Rev. C

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The structure of the neutron-rich bismuth isotope 217 Bi has been studied for the first time. The fragmentation of a primary 238 U beam at the FRS-RISING setup at GSI was exploited to perform γ -decay spectroscopy, since μs isomeric states were expected in this nucleus. Gamma rays following the decay of a t 1/2 = 3 μs isomer were observed, allowing one to establish the low-lying structure of 217 Bi. The level energies and the reduced electric quadrupole transition probability B(E2) from the isomeric state are compared to large-scale shell-model calculations.

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Production of exotic nuclear isomers in multi-nucleon transfer reactions

Regan¹,

Valiente-Dobón²,

Wheldon³

et al. 2004

Laser Phys. Lett.

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This paper reports on recent work using multinucleon transfer reactions to populate metastable states in neutron-rich, rare-earth and transitional nuclei with A∼180-200. The use of a position sensitive gas-filled detector, CHICO, allowed the directions of the binary fragments to be measured, thereby enabling event-by-event Doppler corrections to be made for the prompt, in-beam transitions depopulating the nuclei of interest. By using the temporal calibration provided by (i) the measurement of the binary reaction fragments and (ii) the natural pulsing of the cyclotron beam, transitions from metastable states with lifetimes in the nano-to-microsecond regime could be identified. The complementarity of this technique with the novel use of relativistic projectile fragmentation reactions is outlined, together with potential future avenues for this research, with a particular emphasis on the population of exotic isomeric states at high angular momentum and excitation energy values.

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Structure of exotic nuclei near and above 208Pb populated via deep-inelastic collisions

Cited by 31 publications

References 0 publications

γ -ray spectroscopy of Tl209

γ -ray spectroscopy of Tl209

Isomeric decay spectroscopy of theBi217isotope

Production of exotic nuclear isomers in multi-nucleon transfer reactions

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