High spin states in 210Pb

Rejmund, M.; Maier, K. H.; Broda, R.; Lach, M.; Wrzesiński, J.; Agramunt, J.; Blomqvist, J.; Gadea, A.; Gerl, J.; Górska, M.; Grawe, H.; Kaspar, M.; Kozhoukharov, I.; Peter, I.; Schaffner, H.; Schubart, R.; Schlegel, C.; Stengel, Gudrun; Wan, Shaolong; Wollersheim, H. J.

doi:10.1007/s002180050397

Cited by 27 publications

(24 citation statements)

References 12 publications

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“…The present coincidence analysis confirmed the main part of the level scheme first reported in Ref. [8], and discussed more completely in Ref. [9].…”

Section: B Identification Of ν G 9/2 I 11/2 Statessupporting

confidence: 78%

“…These results also confirm the earlier tentative assignments of Refs. [8,9], which were merely based on shell-model expectations. The 12 − spin parity assigned to the 3212.2-keV level follows from the anisotropy of the 703.8-keV γ ray, which is compatible with a I = 1, M1 transition.…”

Section: B Identification Of ν G 9/2 I 11/2 Statesmentioning

confidence: 99%

“…These were based mostly on a study of 210 Tl β decay [5] that, together with data from (t, p) [6] and (t, pγ ) [7] reactions, established the low-spin part of the level scheme. The high-spin levels were investigated in earlier DIHIR experiments using γ -ray spectroscopy techniques [8,9]. The resulting 210 Pb level scheme was fairly well developed, but spin-parity assignments remained speculative in the absence of multipolarity information.…”

Section: Introductionmentioning

confidence: 99%

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Two-neutron and core-excited states in Pb210 : Tracing E3 collectivity and evidence for a new β -decaying isomer in
Broda
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Iskra
²
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Janssens
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et al. 2018
Phys. Rev. C
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Yrast and near-yrast levels up to an I = 17h spin value and a 6-MeV excitation energy have been delineated in the "two-neutron" 210 Pb nucleus following deep-inelastic reactions involving 208 Pb targets and a number of heavy-ion beams at energies ∼25% above the Coulomb barrier. The level scheme was established on the basis of multifold prompt and delayed coincidence relationships measured with the Gammasphere array. In addition to the previously known states, many new levels were identified. For most of the strongly populated states, spin-parity assignments are proposed on the basis of angular distributions. The reinvestigation of the ν(g 9/2 ) 2 , 8 + isomeric decay results in the firm identification of the low-energy E2 transitions involved in the 8 + → 6 + → 4 + cascade, and in a revised 6 + level half-life of 92(10) ns, nearly a factor of 2 longer than previously measured. Among the newly identified states figure spin I = 4-10h levels associated with the νg 9/2 i 11/2 multiplet, as well as yrast states involving νg 9/2 j 15/2 , νi 11/2 j 15/2 , and ν(j 15/2 ) 2 neutron couplings. The highest-spin excitations are understood as 1p-1h core excitations and the yrast population is found to be fragmented to the extent that levels of spin higher than I = 17h could not be reached. Four E3 transitions are present in the 210 Pb yrast decay; three of these involve the g 9/2 → j 15/2 octupole component, as reflected in the 21(2) and > 10 Weisskopf unit enhancements of the B(E3) rates of the first two. The fourth, 16 + → 13 − E3 transition corresponds to the 3 − core octupole excitation built on the νi 11/2 j 15/2 state, in analogy to a similar E3 coupling to the νj 15/2 level in 209 Pb. Shell-model calculations performed for two-neutron states and 1p-1h 208 Pb core excitations are in good agreement with the data. Evidence was found for the existence of a hitherto unknown high-spin β-decaying isomer in 210 Tl. Shell-model calculations of the 210 Tl levels suggest the possibility of a 11 + long-lived, β-decaying state, and the delayed yields observed in various reactions fit rather well with a 210 Tl assignment.

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“…The present coincidence analysis confirmed the main part of the level scheme first reported in Ref. [8], and discussed more completely in Ref. [9].…”

Section: B Identification Of ν G 9/2 I 11/2 Statessupporting

confidence: 78%

Section: B Identification Of ν G 9/2 I 11/2 Statesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two-neutron and core-excited states in Pb210 : Tracing E3 collectivity and evidence for a new β -decaying isomer in
Broda
¹
,
Iskra
²
,
Janssens
³

et al. 2018
Phys. Rev. C
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“…This technique allowed to study the yrast structure in many nuclei in the vicinity of 208 Pb that were hitherto inaccessible for this kind of spectroscopic investigations, especially at the neutron-rich edge of the region (e.g. [4][5][6]). Moreover, in some of the already well-studied nuclei, the range of the observed excited states could be significantly extended to include yrast structures up to spin values of approx.…”

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confidence: 99%

High-spin states and isomers in the one-proton-hole and three-neutron-hole204Tl isotope

et al. 2011

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“…Deep-inelastic scattering reactions populated high-spin states in 208−210 Pb [1][2][3] and 211 Bi [4], yielding information on single-particle states and their coupling to collective modes. At FRS-GSI Pfützner et al [5] identified eight previously unobserved isotopes with Z = 80-84 in the fragmentation of a 1 GeV/nucleon 238 U beam.…”

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confidence: 99%

β−decay of the neutron-rich isotope215Pb

et al. 2013

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This Brief Report reports on the first observation of the β − -delayed γ decay of 215 Pb, feeding states in 215 Bi. The 215 Pb beam was produced using resonant laser ionization and mass separated at the ISOLDE-CERN on-line mass separator. This ensured clean identification of the γ rays as belonging to the decay of 215 Pb or its β-decay daughters. A half-life of 147 (12) Despite the wealth of experimental data available for the doubly magic nucleus 208 Pb (Z = 82,N = 126) and its closest neighbors, the more neutron-rich lead isotopes remain poorly explored. The reason for the limited spectroscopic information lies in the experimental difficulties to access this region of the nuclear chart. Indeed the high N/Z ratio of these isotopes rules out heavy-ion fusion-evaporation reactions to produce the nuclei of interest and spallation reactions suffer from high contamination levels from more abundantly produced isobars.However for which data were collected during the same experimental campaign have been reported elsewhere.The β − decay of 215 Pb has been observed at ISOLDE in a high-energy proton induced spallation reaction. A 1.4 GeV pulsed proton beam bombarded a thick (50 g/cm 2 ) UC x target. The proton beam, with an intensity of 3.1 × 10 13 particles per pulse was delivered by the PS booster, during a 16.8 s long supercycle, made of 14 equidistant pulses, 1.2 μs long each. Out of these 14 pulses, seven were sent to the ISOLDE target. After diffusion out of the target, the spallation products were selectively ionized in the resonance ionization laser ion source [10,11]. The element-selective laser ionization of the lead isotopes in the hot niobium cavity (2100 • C, 3 mm diameter, 30 mm length) was achieved in three steps: after doubling of the fundamental frequency in a nonlinear BBO (β barium borate) crystal, a tunable pulsed dye laser delivered a photon beam with a wavelength λ = 283.305 nm to raise a valence electron out of the 6p 2 (1/2,1/2) 0 ground state to a first excited atomic state 6p7s(1/2,1/2) 1 . For the second step, the wavelength of the second dye laser was tuned to 600.186 nm, thus exciting the atoms to a 6p8p(1/2,3/2) 2 state. The copper-vapor lasers, pumping the dye lasers, simultaneously provided the necessary energy for the final ionizing step.Subsequently, the ions were extracted by a 60 kV extraction voltage and mass separated by the ISOLDE-GPS separator. After every proton impact, the beam-gate was closed for 100 ms reducing the isobaric contamination, lowering the amount of 067303-1 0556-2813/2013/87(6)/067303(5)

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High spin states in 210Pb

Cited by 27 publications

References 12 publications

Two-neutron and core-excited states in Pb210 : Tracing E3 collectivity and evidence for a new β -decaying isomer in
Broda
¹
,
Iskra
²
,
Janssens
³

et al. 2018
Phys. Rev. C
Self Cite
17
0
3
1
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Two-neutron and core-excited states in Pb210 : Tracing E3 collectivity and evidence for a new β -decaying isomer in
Broda
¹
,
Iskra
²
,
Janssens
³

et al. 2018
Phys. Rev. C
Self Cite
17
0
3
1
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High-spin states and isomers in the one-proton-hole and three-neutron-hole204Tl isotope

β−decay of the neutron-rich isotope215Pb

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High spin states in 210Pb

Cited by 27 publications

References 12 publications

Two-neutron and core-excited states in Pb210 : Tracing E3 collectivity and evidence for a new β -decaying isomer in Broda1, Iskra2, Janssens3 et al. 2018Phys. Rev. CSelf Cite17031View full textAdd to dashboardCite

Two-neutron and core-excited states in Pb210 : Tracing E3 collectivity and evidence for a new β -decaying isomer in Broda1, Iskra2, Janssens3 et al. 2018Phys. Rev. CSelf Cite17031View full textAdd to dashboardCite

High-spin states and isomers in the one-proton-hole and three-neutron-hole204Tl isotope

β−decay of the neutron-rich isotope215Pb

Contact Info

Product

Resources

About

Two-neutron and core-excited states in Pb210 : Tracing E3 collectivity and evidence for a new β -decaying isomer in
Broda
¹
,
Iskra
²
,
Janssens
³

et al. 2018
Phys. Rev. C
Self Cite
17
0
3
1
View full text Add to dashboard Cite

Two-neutron and core-excited states in Pb210 : Tracing E3 collectivity and evidence for a new β -decaying isomer in
Broda
¹
,
Iskra
²
,
Janssens
³

et al. 2018
Phys. Rev. C
Self Cite
17
0
3
1
View full text Add to dashboard Cite