Electromagnetic properties of isomers in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Pb</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>210</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Decman, D.J.; Becker, J. A.; Carlson, J.B.; Lanier, R.G.; Mann, L.G.; Struble, G.L.; Maier, K. H.; Stöffl, W.; Sheline, Raymond K.

doi:10.1103/physrevc.28.1060

Cited by 20 publications

(16 citation statements)

References 13 publications

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“…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%

“…A pure E2 decay is expected [26] to have α T h tot = 1.6, so there is little doubt this assignment is correct and the spin and parity of the 1181 keV level is J π = 13/2 + as shown in Fig 3. Again, this decay is a close analog of the 210 Pb core J π = 6 + to 4 + which has energy 98 keV. The J π = 6 + state in 210 Pb is isomeric with a half-life of 49(6) ns [24]. We find that the time distribution of all the γ rays below the 1181 keV state are consistent with the presence of two higher-lying isomers, the lower state being best fitted with T 1/2 = 14(5) ns, as shown in Figure 4, and implying reduced matrix element B(E2) = 4.2(18) W.u.…”

Section: E the 1181 Kev Statementioning

confidence: 99%

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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: 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%

Section: E the 1181 Kev Statementioning

confidence: 99%

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γ -ray spectroscopy of Tl209

et al. 2017

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“…[4]. 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].…”

Section: Introductionmentioning

confidence: 99%

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
17
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3
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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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