Nuclear Data Sheets for A = 191

Vanin, V. R.; Maidana, Nora L.; Castro, R. M.; Achterberg, E.; Capurro, O. A.; Martí, G. V.

doi:10.1016/j.nds.2007.10.002

Cited by 53 publications

(15 citation statements)

References 295 publications

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“…In 191 Re, we are unable to suggest a level scheme. Most likely the isomer feeds the π 9/2 − [514] band head as the energy of the 140-keV transition is in agreement with the (11/2 − ) →(9/2 − ) energy difference [52]. The strong x rays as well as the lifetime suggest an M2 decay from the isomer, possibly arising from the same proton configuration change (with a broken neutron pair) as in 193 Re.…”

Section: -17supporting

confidence: 57%

“…According to the interpretation proposed here, the isomers observed in the odd-mass Pt isotopes have similar structure to that in the neighboring even-even Pt isotopes, with an added neutron in the i 13/2 orbital. Isomeric states with similar structure were previously identified in lighter Pt isotopes, such as 191,193 Pt [52,53]. This interpretation differs from the previously suggested one [40] for 201 Pt (the data on the isomers in 197,199 Pt is new).…”

Section: In 200mentioning

confidence: 42%

“…The strong x rays as well as the lifetime suggest an M2 decay from the isomer, possibly arising from the same proton configuration change (with a broken neutron pair) as in 193 Re. We note that the 9/2 − band head at 145(3) keV [52] is likely to be isomeric with a similar lifetime, decaying into the 5/2 + band head at 97(3) keV (but the observed x rays are not from this decay and the 97(3)-keV transition is not observed).…”

Section: -17mentioning

confidence: 81%

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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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Section: -17supporting

confidence: 57%

Section: In 200mentioning

confidence: 42%

Section: -17mentioning

confidence: 81%

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

et al. 2011

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“…5-7 for the even-odd [187][188][189][190][191][192][193][194][195][196][197] Pt isotopes. In these figures, the IBFM calculations (energies, spin and parity) are in good agreements with the experimental data [25, [37][38][39][40][41][42]. The levels with '( )' correspond to cases for which the spin and/or parity of the corresponding states are not well established experimentally.…”

Section: Energy Levelssupporting

confidence: 71%

Negative parity low-spin states of even–odd 187–197 Pt isotopes

Kassim

Sharrad

2015

Nuclear Physics A

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“…12 but for the 191,193 Ir [23,24] and 197 Au [25] isotopes indicate that the cross sections for the (n, 4n) channels become comparable to those in the (n, 3n) channels at E n ∼ 28 MeV, as it is shown for the case of 197 Au in Fig. 13.…”

Section: Discussionmentioning

confidence: 67%

Feeding of Rh and Ag isomers in fast-neutron-induced reactions

et al. 2016

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Background: In (n, n ′ ) reactions on stable Ir and Au isotopes in the mass A = 190 region the experimentally established feeding of the isomers relative to the feeding of the corresponding ground states increases with increasing neutron energy up to the neutron energy where the (n, 2n) reaction channel opens up and then decreases.Purpose: In order to check for similar behavior in the mass A = 100 region the feeding of isomers and ground states in fast-neutron-induced reactions on stable isotopes in this mass region was studied. This is of especial interest for Rh which can be used as a radiochemical detector.Methods: Excited states were studied using the (n, n ′ γ), (n, 2nγ) and (n, 3nγ) reactions on 103 Rh and 109 Ag. A germanium-detector array for γ-ray detection and the broad-spectrum pulsed neutron source of the Los Alamos Neutron Science Center's Weapons Neutron Research facility were used for the measurement. The energy of the incident neutrons was determined using the time-of-flight technique.Results: Absolute partial γ-ray cross sections were measured for 57 transitions feeding isomers and ground states in 101,102,103 Rh and 107,108,109 Ag. The feeding of the isomers was found to be very similar in the corresponding reaction channels and it is compared to the feeding determined for the ground states. Conclusions:The opening of reaction channels at higher neutron energies removes angular momentum from the residual nucleus and reduces the population of the higher-spin isomers relative to the feeding of the lower-spin ground states. Similar behavior was observed in the mass A = 190 region in the feeding of higher-spin isomers, but the reverse behavior was observed in 176 Lu with a lower-spin isomer and a higher-spin ground state.PACS numbers: PACS number(s): 25.40.-h, 28.20.-v, 24.10.-i, 25.40.Fq * fotia@lanl.gov 2

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Nuclear Data Sheets for A = 191

Cited by 53 publications

References 295 publications

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

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

Negative parity low-spin states of even–odd 187–197 Pt isotopes

Feeding of Rh and Ag isomers in fast-neutron-induced reactions

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