Shape coexistence in the odd-odd 186Au nucleus

Porquet, M. G.; Bourgeois, C.; Kilcher, P.; Sauvage-Letessier, J.

doi:10.1016/0375-9474(83)90508-0

Cited by 28 publications

(5 citation statements)

References 34 publications

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“…The data available do not allow any conclusion to be drawn as to whether the strong deformation expected around N~105 is reached in a smooth way or by a sudden onset of deformation caused by the nearby magic proton number. Recent investigations of ~86Au by nuclear spectroscopy indicate a similar shape coexistence in this nucleus [62] as found for lSSHg [5]. Hence, a sudden change of the nuclear shape is also expected in the very neutron-deficient Au isotopes.…”

Section: Leadmentioning

confidence: 71%

Isotope shifts of neutron-deficient gold isotopes with 193?A?190

et al. 1985

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The isotope shift between 197Atl (stable) and the radioactive Au isotopes 19~ 191Au, 192Au and 193Au were determined by resonance fluorescence spectroscopy in the 6sZS1/2-6pZP1/2. 2=267.6nm line. The unstable Au isotopes were produced at the ISOLDE mass separator at CERN. The nuclei were investigated semi on-line in a resonance vessel, heated to 1,400~The results are (~v 190'197= -11.12(39) GHz, 6V191'197=--9.67(12) GHz, GHz, 0V193't97=--6.29(ll) GHz, corresponding to a change of the mean-square charge radius by 6~r2) 19~ =0.261(12) fm 2, 6(r2)19a,197=0.227(5)fm2, 6(rz)192,197=0.195 (5)

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Section: Leadmentioning

confidence: 71%

Isotope shifts of neutron-deficient gold isotopes with 193?A?190

et al. 1985

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“…[8]. The reduced transition probabilities B(EI) and Weisskopf hindrance factors FW calculated for the transitions depopulating the 228.6 keV isomeric level are compared, in table 1, to the B(E1) and FW values calculated for similar transitions in the odd-A 18lOs [12] and 181pt [13,14] nuclei, and in the doubly-odd 182Ir [15], 184Ir [16,17] and 186Au [18]. The similarities observed in …”

mentioning

confidence: 78%

Spin and parity of isomeric and ground states of the doubly-odd nucleus184Au

Ibrahim

Kilcher

Roussière

et al. 1994

Z. Physik A - Hadrons and Nuclei

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: Low-spin states in doubly-odd 184Au have been populated in the [~+/EC decay of 184Hg produced by bombarding 148Sm targets with an 185 MeV 40Ar beam.Radioactive Hg nuclei were transported by a He jet system. A new level scheme has been established from T-y-t and X-y-t coincidence measurements. Spin and parity values I x = 5 +, IX = 2 + and I n = 3-were assigned to the ground state and the two isomeric states of 184Au, respectively. The structure of these states is discussed using B(E1) values. PACS : 23.20.Lv, 27.70.+q, 21.10. Hw, 21.10.Tg The NICOLE group discovered that the alleged ground state of the doubly-odd nucleus 184Au is, actually, an isomer with spin value I = 2 or 3 linked to the ground state with spin value I = 5 or 6 by an M3 isomeric transition [1]. An unusual fact is that the ground-state decay half-life is shorter than the isomer one, which explains why it was unknown until now [2,3].Moreover, the ground-state spin value and the existence of an isomer are difficult to understand with the v | x prolate configurations that are expected in 184Au from the neutron and proton states lying at low energy in the neighbouring odd-A nuclei [4]. This led us to search for answers to the following questions : is the ground-state nuclear shape oblate or prolate, and what are the spin and parity values of the isomeric and ground states ?We answered the first point by studying the properties of the rotational bands observed in in-beam experiments. They indicate clearly that, at low excitation energy, the t84Au nucleus has a prolate shape [4,5].

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“…It is worth noting that the 1 + level at 1002.5 keV, strongly fed in the β decay of 182 Pt, de-excites mainly towards the 2 − states located at 321.1 and 345.9 keV. It behaves in a similar manner to the most fed 1 + states of 184,186 Au and 184 Ir that also decay mainly to negative-parity states with I = 1, 2 levels [43,44,45]. From table 3 the 1 + levels expected at rather high energy could have the following configurations:…”

Section: Two-quasiparticle Axial-rotor Calculationsmentioning

confidence: 99%

Structure of low-spin states in the doubly-odd 182Ir nucleus

et al. 2007

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Low-spin states of 182 Ir were populated through the β + /EC decay of 182 Pt. Two strong E2 transitions were observed for the first time: a 25.7 keV transition in 182 Ir and a 34.0 keV transition in Re of probable mass A = 178. Spin and parity, I π = 3 + , are firmly assigned to the 182 Ir ground state (g.s.). For the excited states, the parity is established and the spin determined or restricted. These assignments support most of the interpretations of the level structure previously suggested. The systematics for the known 5 + → 3 + transitions in π h 9/2 ⊗ ν 1/2 − [521] bands is presented. Using a semi-microscopic twoquasiparticle axial-rotor coupling model, particle configurations have been attributed or suggested for most of the coupled states lying at low energy in 182 Ir.

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Shape coexistence in the odd-odd 186Au nucleus

Cited by 28 publications

References 34 publications

Isotope shifts of neutron-deficient gold isotopes with 193?A?190

Isotope shifts of neutron-deficient gold isotopes with 193?A?190

Spin and parity of isomeric and ground states of the doubly-odd nucleus184Au

Structure of low-spin states in the doubly-odd 182Ir nucleus

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