Investigation of the high-spin structure of 200,202Pb

Fant, B.; Weckström, T.; Jain, H. C.; Norlin, L. O.; Rensfelt, K. G.; Carlé, P.; Rosengård, U.

doi:10.1016/0375-9474(87)90170-9

Cited by 25 publications

(27 citation statements)

References 30 publications

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“…As we did not see a 665 keV conversion line, which is only consistent with an E 1 assignment, the spin and parity assignments 16 +, 17-and 19-for the states on top of the 16+ state (Fig. 5a) are deduced confirming the results of [15]. The spectrum of electrons following the 45 keV conversion lines (Fig.…”

Section: Pb"supporting

confidence: 76%

“…In the following discussion we will use these two alternative approaches to the structure of the lead isotopes. [15], whereas the 9-7-transition with the present lifetime fits well into the experimental and theoretical E2 systematics [2].…”

Section: Discussionsupporting

confidence: 52%

“…The multipolarity of the 197 keV line was determined to be M 1 from its K/L ratio. This provides an independent check for the spin and parity assignment of the I n = 17-and 19-states, which so far are based on the configuration of the I n = 19-isomer as deduced from a g-factor measure- The long delayed background (940-1240 ns) is subtracted ment [15]. As we did not see a 665 keV conversion line, which is only consistent with an E 1 assignment, the spin and parity assignments 16 +, 17-and 19-for the states on top of the 16+ state (Fig.…”

Section: Pb"mentioning

confidence: 99%

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Conversion electron measurement of isomeric primary transitions in196, 198, 199, 200, 201Pb

Sun

Rosengård

Grawe

et al. 1989

Z. Physik A - Atomic Nuclei

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The transition energies of nine low energy primary transitions from high spin isomers in 196, i98,199,zoo,zolpb have been measured with conversion electron spectroscopy using e-e-and e-7 coincidences. B(E2) values as deduced from the measured lifetimes and transition energies are discussed in terms of seniority shell model configurations and of a quasiparticle Tamm-Dancoff approach using the surface delta interaction. A revised discussion of the effective E2 charge in neutron deficient Pb isotopes is presented.

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Section: Pb"supporting

confidence: 76%

Section: Discussionsupporting

confidence: 52%

Section: Pb"mentioning

confidence: 99%

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Conversion electron measurement of isomeric primary transitions in196, 198, 199, 200, 201Pb

Sun

Rosengård

Grawe

et al. 1989

Z. Physik A - Atomic Nuclei

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“…at 2154 keV, 9 − [(νf 5/2 ) −1 (νi 13/2 ) −1 ] at 2183 keV, and 6 − (similar configuration as the 5 − or 7 − state) at 2257 keV in 200 Pb [53], which is the isotone of 205 Fr, are formed by the valence neutron pairs. It is worth noting that these core states are very stable in level energy against changing neutron number; see, for instance, the studies (and references therein) for systematics in lead [54] and polonium [55] nuclei. Similar negative-parity states are expected to exist in 204 Rn, although a complete set of them has not yet been observed [9].…”

Section: Discussionmentioning

confidence: 99%

Recoil-decay tagging study of205Fr

et al. 2012

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The nucleus 205 Fr has been studied through γ-ray and electron spectroscopy using the recoil-decay tagging technique. The resulting level scheme presents a spherical structure built on the 9/2 − ground state and a rotational structure on top of a short-lived isomer. The isomer, with a spin and parity of 13/2 + and a half-life of 80(20) ns, de-excites by an M2 transition directly to the 9/2 − ground state. Another, longer-lived, isomer, with a half-life of 1.15(4) ms, has also been found and assigned a spin and parity of 1/2 +. Transitions populating and de-exciting this isomer have been observed as well.

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“…In some cases the same nucleus was observed in several identification plots. In this instance, the delayed decay data (i.e., γ -ray energy and time) associated with a given nucleus [19][20][21][22][23]. A time gate t was applied to separate the isomeric decay from the prompt radiation flash observed by some germanium detectors following fragment implantation.…”

Section: A Identification Of Reaction Residuesmentioning

confidence: 99%

Population of high-spin isomeric states following fragmentation of238U

Bowry¹,

Podolyák²,

Piétri³

et al. 2013

Phys. Rev. C

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Isomeric ratios have been determined for 23 metastable states identified in A ≈ 200 nuclei from Pt to Rn near the valley of stability following fragmentation of 238 U. This includes high-spin states with angular momenta ranging from (39/2)h to 25h. The experimental results are discussed together with those of similar experiments performed in this mass region. Isomeric ratios are compared with theoretical predictions where the angular momentum of the fragment arises purely due to the angular momentum of nucleons removed from the projectile. The theoretical yield of low-spin states is generally overestimated. In these cases the assumption of 100% feeding of the isomer may require modification. However, the yield of high-spin isomeric states [I m (39/2)h] is significantly underestimated and highlights the requirement for a more complete theoretical framework in relation to the generation of fragment angular momentum. The enhanced population of high-spin states reported here is advantageous to future studies involving isomeric beams at fragmentation facilities such as the Rikagaku Kenkyusho RI Beam Factory (Japan) and next-generation facilities at the Facility for Antiproton and Ion Research (Germany) and Facility for Rare Isotope Beams (USA).

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Investigation of the high-spin structure of 200,202Pb

Cited by 25 publications

References 30 publications

Conversion electron measurement of isomeric primary transitions in196, 198, 199, 200, 201Pb

Conversion electron measurement of isomeric primary transitions in196, 198, 199, 200, 201Pb

Recoil-decay tagging study of205Fr

Population of high-spin isomeric states following fragmentation of238U

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