Nuclear data sheets for A = 209

Martin, M.J.

doi:10.1016/s0090-3752(05)80012-2

Cited by 132 publications

(76 citation statements)

References 178 publications

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“…Breaking of the N=126 neutron core must occur to observe states of higher spin and energy than this state. Similar states have been observed in, for example, 206 Hg, 209 Bi, 207 Pb, and 209 Pb [1,6,7].…”

Section: Introductionsupporting

confidence: 78%

Study of²⁰⁷Tl₁₂₆Produced in Deep-Inelastic Reactions

Wilson

Podolyák

Fornal

et al. 2014

EPJ Web of Conferences

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Abstract. Deep-inelastic collisions of a 208 Pb beam on a 208 Pb target were performed using the ATLAS accelerator at Argonne National Laboratory. The Gammasphere detector array was used for the detection of prompt and delayed gamma-rays of the reaction products. 207 Tl is one proton away from the 208 Pb doubly-magic nucleus. Its low-energy level structure is dominated by the single proton-hole states πs −1 1/2 , πd −1 3/2 , and πh −1 11/2 . The 11/2 − state is isomeric with T 1/2 = 1.33(11) s. The reaction partner of 207 Tl is 209 Bi, which has a relatively well established level scheme compared to 207 Tl. Cross-coincidences between these two nuclei were used to confirm or establish levels above the 11/2 − isomeric state in 207 Tl. These states are obtained via breaking of the neutron core. Angular correlation analysis was performed on known transitions in 208 Pb, proving the applicability of this method for multipolarity assignment.

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Section: Introductionsupporting

confidence: 78%

Study of²⁰⁷Tl₁₂₆Produced in Deep-Inelastic Reactions

Wilson

Podolyák

Fornal

et al. 2014

EPJ Web of Conferences

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“…In the case of nuclei with Z < 82 and N > 126, excited states were reported only in 208 Tl [8] and 209 Tl [9,10]. The lack of information on nuclei in this region is mainly from the difficulties in creating and populating excited states in these neutron-rich nuclei.…”

mentioning

confidence: 99%

Nuclear structure “southeast” ofPb208: Isomeric states inHg208
Al‐Dahan¹,
Podolyák²,
Regan³
et al. 2009
Phys. Rev. C
33
1
15
0
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The nuclear structure of neutron-rich N > 126 nuclei has been investigated following their production via relativistic projectile fragmentation of a E/A = 1 GeV 238 U beam. Metastable states in the N = 128 isotones 208 Hg and 209 Tl have been identified. Delayed γ -ray transitions are interpreted as arising from the decay of I π = (8 + ) and (17/2 + ) isomers, respectively. The data allow for the so far most comprehensive verification of the shell-model approach in the region determined by magic numbers Z < 82 and N > 126. The understanding of how shell structure arises and develops is a major goal in contemporary nuclear physics. To this end, it is of particular importance to measure the properties of nuclei in the vicinity of closed shells. Information on the single-particle energies, proton-neutron interactions, and twobody residual interactions can be derived from experimental observables such as masses, energies of excited states, and transition probabilities [1].Furthermore, information on the global behavior of nuclei can be obtained from the energy spacing of the lowest lying states in even-even systems. Recently, it was shown that there is direct empirical correlation between the p-n interaction strength and the growth of collectivity determined from the energies of the first 2 + and 4 + excitations [2]. The p-n interaction [2-4], especially among valence nucleons, is an important factor in controlling the onset and development of collectivity and deformation in nuclei and in determining the structure of nuclear transition regions. However, there is no double-magic nucleus (above mass 48), around which * Corresponding author: Z.Podolyak@surrey.ac.uk spectroscopic data are available in all four quadrants beyond the one-and two-particle neighbors.Although many nuclei in the 208 Pb region have been studied, we have no information on the excited states of even-even nuclei in the "southeast" quadrant defined by Z < 82 and N > 126. Yet, such nuclei, representing the particle-hole sector surrounding 208 Pb, are critical for understanding the effects of seniority, the onset of proton-neutron configuration mixing that drives collectivity and nuclear deformation. This study provides the first spectroscopic data on an even-even nucleus in this region, namely 208 Hg, and it allows the first detailed verification of the shell-model approach and nucleonnucleon interaction in this region away from the semi-magic nuclei and the particle-hole neighbor 208 Tl [5]. Recently, the mass of 208 Hg was measured [4], allowing the extraction of the average p-n interaction for 210 Pb, the first value in the proton-hole-neutron-particle quadrant. The combination of mass and spectroscopic data is essential in understanding the evolution of structure near doubly magic nuclei. Indeed, it has recently been shown that the link between masses and structure is stronger and more sensitive than hitherto thought [6]. Furthermore, because the newly accessible region near 132 Sn [7] shares many similarities with the Pb region, studies

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“…As in the case of the π (h 9/2 ) 2 4 + ⊗ νi 11/2 configuration levels, these levels are probably from the middle of the configuration spin range. The single-neutron states νd 5/2 and νs 1/2 in 209 Pb reside at 1567 and 2032 keV, respectively [24][25][26]. In the current work, the assigned levels for the corresponding single-particle states in 211 Po are the (5/2) level at 1584 keV and the 1/2 level at 2033 keV, shown in the level scheme presented in Fig.…”

Section: Discussionmentioning

confidence: 72%

“…3 [20], 209 Pb data are taken from Refs. [24][25][26], and 211 Po data are taken from Refs. [7,9] and current work.…”

Section: Discussionmentioning

confidence: 99%

In-beam γ -ray spectroscopy of low- and medium-spin levels in Po211

et al. 2017

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The structure of the low-and medium-spin levels of the 211 Po nucleus have been studied with in-beam γ -ray spectroscopy with the 208 Pb(α,n) 211 Po fusion-evaporation reaction. The level scheme was further extended with levels of the configurations π (h 9/2 ) 2 2 + −4 + ⊗ νg 9/2 , π (h 9/2 ) 2 8 + ⊗ νg 9/2 , π (h 9/2 ) 2 2 + −4 + ⊗ νi 11/2 , π (h 9/2 ) 2 2 + −4 + ⊗ νj 15/2 , π (h 9/2 f 7/2 ) 8 + ⊗ νg 9/2 , and π (h 9/2 ) 2 0 + ⊗ ν(g 9/2 ) 2 0 + (s 1/2 ) −1 . The single-particle neutron states νd 5/2 and νs 1/2 were also identified. Furthermore, a number of states feeding the low-spin structures were added.

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Nuclear data sheets for A = 209

Cited by 132 publications

References 178 publications

Study of²⁰⁷Tl₁₂₆Produced in Deep-Inelastic Reactions

Study of²⁰⁷Tl₁₂₆Produced in Deep-Inelastic Reactions

Nuclear structure “southeast” ofPb208: Isomeric states inHg208
Al‐Dahan¹,
Podolyák²,
Regan³
et al. 2009
Phys. Rev. C
33
1
15
0
View full text Add to dashboard Cite

In-beam γ -ray spectroscopy of low- and medium-spin levels in Po211

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Nuclear data sheets for A = 209

Cited by 132 publications

References 178 publications

Study of207Tl126Produced in Deep-Inelastic Reactions

Study of207Tl126Produced in Deep-Inelastic Reactions

Nuclear structure “southeast” ofPb208: Isomeric states inHg208Al‐Dahan1, Podolyák2, Regan3 et al. 2009Phys. Rev. C331150View full textAdd to dashboardCite

In-beam γ -ray spectroscopy of low- and medium-spin levels in Po211

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Study of²⁰⁷Tl₁₂₆Produced in Deep-Inelastic Reactions

Study of²⁰⁷Tl₁₂₆Produced in Deep-Inelastic Reactions

Nuclear structure “southeast” ofPb208: Isomeric states inHg208
Al‐Dahan¹,
Podolyák²,
Regan³
et al. 2009
Phys. Rev. C
33
1
15
0
View full text Add to dashboard Cite