Nuclear g factors and structure of high-spin isomers in 190,192,194Pt and 196,198Hg

Levon, A. I.; Nosenko, Yu. V.; Onischuk, V. A.; Schevchuk, A. A.; Stuchbery, A.E.

doi:10.1016/j.nuclphysa.2005.09.016

Cited by 42 publications

(19 citation statements)

References 32 publications

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“…Measured values of g factors for the 12 + states viz. -0.18(9), -0.17(7) in 192,194 Pt [12] substantiate this assignment.…”

Section: Discussionsupporting

confidence: 65%

Isomers and oblate collectivity at high spin in neutron-rich Pt isotopes

Tandel

2016

EPJ Web of Conferences

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Abstract. Isomers and high-spin structures with rotation-aligned oblate configurations have been studied in several Pt isotopes. The 12 + states in the even Pt isotopes from 192−198 Pt are found to be metastable, and have (i 13/2 ) 2 neutron character. The progression of E2 transition probabilities from the 12 + to 10 + states across the Pt isotopic chain implies reduction in collectivity, followed by an abrupt decrease at N=120 ( 198 Pt). This behavior is quite distinct from the gradual decrease of B(E2) values near the respective ground states. A large contribution from aligned angular momentum, to the rotational sequences built on the 12 + states, is visible. This is due to the relatively small crossing frequencies for nucleons in low-Ω orbitals at oblate deformation in comparison to higher values for prolate shapes. As a result, oblate rotation is found to be increasingly favored for higher neutron numbers.

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“…Measured values of g factors for the 12 + states viz. -0.18(9), -0.17(7) in 192,194 Pt [12] substantiate this assignment.…”

Section: Discussionsupporting

confidence: 65%

Isomers and oblate collectivity at high spin in neutron-rich Pt isotopes

Tandel

2016

EPJ Web of Conferences

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“…The maximal alignment of the intrinsic angular momentum of the two i 13/2 quasineutrons generates the 12 + state. Subsequent g-factor measurements have confirmed the neutron character of this 12 + level [8].…”

Section: Introductionmentioning

confidence: 65%

Rotation-aligned isomer and oblate collectivity inPt196

Wahid¹,

Chowdhury²,

Janssens³

et al. 2015

Phys. Rev. C

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An oblate rotational sequence, built on an aligned, two-quasineutron isomeric state has been established in 196 Pt. The isomer has a half-life of 7.7(7) ns and is associated with the I π =12 + , (i 13/2 ) 2 neutron configuration. Excited states, with angular momentum generated primarily through successive nucleon alignments, have been populated through 1p transfer from 197 Au. The nucleus 196 Pt is the most neutron-rich Pt isotope for which high-spin states, beyond the 12 + isomeric state, have been established thus far. Cranked shell model calculations have been performed to understand shape evolution with spin, and the role of nucleons occupying specific Nilsson orbitals in generating aligned angular momentum for both prolate and oblate deformations has been explored.

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“…The even-even Pt nuclei are characterized by a 7 − isomeric state with a predominantly π (h −1 11/2 d −1 3/2 )7 − configuration. g-factor measurements [50] in lighter, 190−194 Pt, isotopes support this interpretation. Due to the large number of nucleons outside the closed shell, theoretical calculations were done for 202 Pt only.…”

Section: In 200mentioning

confidence: 74%

Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a208Pb beam

et al. 2011

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Heavy neutron-rich nuclei were populated via the fragmentation of a E/A = 1 GeV 208 82 Pb beam. Secondary fragments were separated and identified and subsequently implanted in a passive stopper. By the detection of delayed γ rays, isomeric decays associated with these nuclei have been identified. A total of 49 isomers were detected, with the majority of them observed for the first time. The newly discovered isomers are in 204,205 80 Hg, 201,202,204,205 79 Au, 197,203,204 78 Pt, 195,[199][200][201][202][203] 193,[197][198][199] 196 75 Re, 190,191 74 W, and 189 73 Ta. Possible level schemes are constructed and the structure of the nuclei discussed. To aid the interpretation, shell-model as well as BCS calculations were performed.

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Nuclear g factors and structure of high-spin isomers in 190,192,194Pt and 196,198Hg

Cited by 42 publications

References 32 publications

Isomers and oblate collectivity at high spin in neutron-rich Pt isotopes

Isomers and oblate collectivity at high spin in neutron-rich Pt isotopes

Rotation-aligned isomer and oblate collectivity inPt196

Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a208Pb beam

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