Study of excited states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>208</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Pb by particle-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>coincidences with the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>207</mml:mn></mml:mrow></mml:msup></mml:mr

Schramm, Michael; Maier, K. H.; Rejmund, M.; Wood, L.D.; N, Roy; Kuhnert, A.; Aprahamian, A.; Becker, J. A.; Brinkman, M. J.; Decman, D.J.; Henry, E. A.; Hoff, R. W.; Manatt, D.R.; Mann, L.G.; Meyer, R.A.; Stoeffl, W.; Struble, G.L.; Wang, T.-F.

doi:10.1103/physrevc.56.1320

Cited by 34 publications

(31 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…12 and extending up to the highest-spin 14 -level at 6744 keV is rather complete and has been broadly discussed in Refs. [17,21,28] as well as in the most recent work by Heusler et al [24]. The new data presented in this work provided more detailed information on the γ-decay paths out of several states.…”

Section: Shell-model Calculations and Interpretation Of High-spin Levelssupporting

confidence: 63%

“…Spectra from calibration sources were used to normalize the yields measured from the 11 rings of detectors located at different angles θ with respect to the beam direction. In the final analysis, the data were reduced to six angles (17,35,53,70,80, and 90 deg.) by adding spectra from forward and backward rings located symmetrically around 90 deg.…”

Section: B Electron-conversion Coefficients γ-Ray Angular Distributmentioning

confidence: 99%

“…However, a more complete set of 148 states has been listed and discussed in the study of Ref. [17] following (d, pγ) and (t, αγ) reactions. The latter work extends to a 7.4 MeV excitation energy and covers a spin range from the ground state up to the highest-spin 14 -level at 6744 keV.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Doubly magic Pb208 : High-spin states, isomers, and E3 collectivity in the yrast decay

et al. 2017

View full text Add to dashboard Cite

Abstract:Yrast and near-yrast levels up to spin values in excess of I = 30ħ have been delineated in the doubly-magic 208 Pb nucleus following deep-inelastic reactions involving 208 Pb targets and, mostly, 430-MeV 48 Ca and 1440-MeV 208 Pb beams. The level scheme was established up to an excitation energy of 16.4 MeV, based on multi-fold γ-ray coincidence relationships measured with the Gammasphere array. Below the well-known, 0.5-μs 10 + isomer, ten new transitions were added to earlier work. The delineation of the higher parts of the level sequence benefited from analyses involving a number of prompt-and delayed-coincidence conditions. Three new isomeric states were established along the yrast line with I π = 20 -(10342 keV), 23 + (11361 keV), and 28 -(13675 keV), and respective half-lives of 22(3), 12.7(2), and 60(6) ns. Gamma transitions were also identified preceding in time the 28 -isomer, however, only a few could be placed in the level scheme and no firm spin-parity quantum numbers could be proposed. In contrast, for most states below this 28 -isomer, firm spin-parity values were assigned, based on total electron-conversion coefficients, deduced for low-energy (<500 keV) transitions from γ-intensity balances, and on measured γ-ray angular distributions. The latter also enabled the quantitative determination of mixing ratios. The transition probabilities extracted for all isomeric transitions in 208 Pb have been reviewed and discussed in terms of the intrinsic structure of the initial and final levels involved. Particular emphasis was placed on the many observed E3 transitions as they often exhibit significant enhancements in strength (of the order of tens of W.u.) comparable to the one seen for the neutron j 15/2 →g 9/2 E3 transition in 209 Pb. In this context, the enhancement of the 725-keV E3 transition (56 W.u.) associated with the decay of the highest-lying 28 -isomer observed in this work remains particularly challenging to explain. Large-scale shell-model calculations were performed with two approaches, a first one where the 1, 2, and 3 particle-hole excitations do not mix with one another, and another more complex one, in which such mixing takes place. The calculated levels were compared with the data and a general agreement is observed for most of the 208 Pb level scheme. At the highest spins and energies, however, the 2 correspondence between theory and experiment is less satisfactory and the experimental yrast line appears to be more regular than the calculated one. This regularity is notable when the level energies are plotted versus the I(I+1) product and the observed, nearly linear, behavior was considered within a simple "rotational" interpretation. Within this approximate picture, the extracted moment of inertia suggests that only the 76 valence nucleons participate in the "rotation" and that the 132 Sn spherical core remains inert. --------------------------

show abstract

Section: Shell-model Calculations and Interpretation Of High-spin Levelssupporting

confidence: 63%

Section: B Electron-conversion Coefficients γ-Ray Angular Distributmentioning

confidence: 99%

See 1 more Smart Citation

Doubly magic Pb208 : High-spin states, isomers, and E3 collectivity in the yrast decay

et al. 2017

View full text Add to dashboard Cite

show abstract

“…One-particle-one-hole excitations dominate the level structure up to an excitation energy of E x ≈ 5.3 MeV, the position of a collective double octupole state [1][2][3]. The structure of the observed states agrees with theoretical expectations up to E x = 4.5 MeV [3,4]. At higher energies not all states expected from the shell model have been detected [5,6] and many spin assignments are still ambiguous.…”

Section: Introductionsupporting

confidence: 68%

Thei11/2f5/2andi11/2
Heusler
¹
,
Graw
²
,
Hertenberger
³

et al. 2006
Phys. Rev. C
23
4
43
1
View full text Add to dashboard Cite

Inelastic proton scattering via isobaric analog resonances allows derivation of rather complete information about neutron particle-hole states. We applied this method to the doubly-magic nucleus 208 Pb by measuring angular distributions of the reaction 208 Pb(p, p ) on top of the isobaric analog resonances in 209 Bi with the Q3D magnetic spectrograph at München. We identify the six states of the i 11/2 f 5/2 multiplet and the four states of the i 11/2 p 3/2 multiplet in the energy range 4.6 MeV < E x < 5.3 MeV. Firm spin assignments for the 10 states are given, most of them new. Additional measurements of the reaction 207 Pb(d, p) confirm the assignments. A new state at E x = 5239 keV has a dominant proton particle-hole structure with spin 4 − .

show abstract

“…The excitation energy in the SSM is derived from the masses of the nuclei 207 Tl,209 Bi,208 Pb and 207 Pb,209 Pb,208 Pb, the excitation energies of the particle states in 209 Bi,209 Pb, and the hole states in 207 Tl,207 Pb, for proton and neutron particle-hole configurations, respectively. Particle spectroscopy offers tools to determine some particle-hole components [1][2][3][4][5].…”

Section: Experiments With the Q3d Magnetic Spectrograph At Garchingmentioning

confidence: 99%

Complete Spectroscopy of negative parity states in²⁰⁸Pb with E_x< 6.3 MeV

Heusler

Hertenberger

Wirth

et al. 2014

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. Using the Q3D magnetic spectrograph at the Maier-Leibnitz-Laboratorium, Garching, experiments with the 208 Pb(p, p ′ ) reaction via isobaric analog resonances and using the 207 Pb(d, p) reaction have been performed with a HWHM of 1.5 keV on the low energy side. All 70 particle-hole states with negative parity predicted by the schematic shell model without residual interaction below E x = 6.3 MeV are identified. Except for the states with spins 1 − and 2 − , more than 80% of the strength in each state can be described by at most four configurations; for spins 0 − , 4 − , 6 − , 7 − , and 8 − two configurations or even one configuration describe more than 95% of the strength. Natural parity configurations are more strongly mixed than unnatural parity configurations.

show abstract

Study of excited states in208Pb by particle-γcoincidences with the207

Cited by 34 publications

References 17 publications

Doubly magic Pb208 : High-spin states, isomers, and E3 collectivity in the yrast decay

Doubly magic Pb208 : High-spin states, isomers, and E3 collectivity in the yrast decay

Thei11/2f5/2andi11/2
Heusler
¹
,
Graw
²
,
Hertenberger
³

et al. 2006
Phys. Rev. C
23
4
43
1
View full text Add to dashboard Cite

Complete Spectroscopy of negative parity states in²⁰⁸Pb with E_x< 6.3 MeV

Contact Info

Product

Resources

About

Study of excited states in208Pb by particle-γcoincidences with the207

Cited by 34 publications

References 17 publications

Doubly magic Pb208 : High-spin states, isomers, and E3 collectivity in the yrast decay

Doubly magic Pb208 : High-spin states, isomers, and E3 collectivity in the yrast decay

Thei11/2f5/2andi11/2Heusler1, Graw2, Hertenberger3 et al. 2006Phys. Rev. C234431View full textAdd to dashboardCite

Complete Spectroscopy of negative parity states in208Pb with Ex< 6.3 MeV

Contact Info

Product

Resources

About

Thei11/2f5/2andi11/2
Heusler
¹
,
Graw
²
,
Hertenberger
³

et al. 2006
Phys. Rev. C
23
4
43
1
View full text Add to dashboard Cite

Complete Spectroscopy of negative parity states in²⁰⁸Pb with E_x< 6.3 MeV