Shape transition in neutron deficient Pt isotopes

Duong, H. T.; Pinard, J.; Liberman, S.; Savard, G.; Lee, J.K.P.; Crawford, J. E.; Thekkadath, G.; Blanc, F. Le; Kilcher, P.; Obert, J.; Oms, J.; Putaux, J.C.; Roussière, B.; Sauvage, J.

doi:10.1016/0370-2693(89)90068-3

Cited by 57 publications

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“…4(b), taking into account the isotope shift as a fixed parameter. The IS value was evaluated from the measured values for the 192,194,196,198 Pt isotopes, considering the linear relation of the isotope shift [25,26]. The value A ex = 1.17 ± 0.10 GHz for the λ 1 laser power 70 μJ/pulse and 88 kPa gas cell pressure was obtained as a best-fit result.…”

Section: -5mentioning

confidence: 99%

“…As a first step, the magnetic dipole moments of 199g Pt (Z = 78, N = 121, I π = 5/2 − , and t 1/2 = 30.8(2) min) ground state and 199m Pt (I π = (13/2) + , and t 1/2 = 13.6(4) s) isomeric state [23] were measured by in-gas-cell laser ionization spectroscopy. The nuclear structures of platinum isotopes with 178 A 198 have been well studied through measurements of μ, Q, and charge radius by laser spectroscopy [24][25][26][27][28]. In the lighter, neutron-deficient region 178 A 183, shape coexistence was found and has been discussed in relation to the charge radii evaluated from the measured isotope shift (IS) [28].…”

Section: Introductionmentioning

confidence: 99%

“…In the lighter, neutron-deficient region 178 A 183, shape coexistence was found and has been discussed in relation to the charge radii evaluated from the measured isotope shift (IS) [28]. For the heavier region 183 A 198, the prolate (183 A 188), triaxial (190 A 194), and oblate (196 A 198) shapes have been discussed and compared with theoretical models [24][25][26][27]. In the more neutron-rich region, a spherical shape is dominant toward the shell closure at N = 126 in the same way as seen for lead (Z = 82) and mercury (Z = 80) isotopes [29], predicted by the droplet model [30] with β 2 = 0.…”

Section: Introductionmentioning

confidence: 99%

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In-gas-cell laser spectroscopy of the magnetic dipole moment of the N≈126 isotope Pt199

et al. 2017

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The magnetic dipole moment and mean-square charge radius of 199g Pt (I π = 5/2 − , t 1/2 = 30.8 min) ground state and 199m Pt (E ex = 424 keV, I π = (13/2) + , t 1/2 = 13.6 s) isomeric state are evaluated for the first time from investigations of the hyperfine splitting of the λ 1 = 248.792 nm transition by in-gas-cell laser ionization spectroscopy. Ground and isomeric states of neutron-rich 199 Pt nucleus were produced by a multinucleon transfer reaction at the KEK Isotope Separation System (KISS), designed for the study of nuclear spectroscopy in the vicinity of N = 126. The measured magnetic dipole moments +0.75(8)μ N and −0.57(5)μ N are consistent with the systematics of those of nuclei with I π = 5/2 − and I π = 13/2 + , respectively.

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Section: -5mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In-gas-cell laser spectroscopy of the magnetic dipole moment of the N≈126 isotope Pt199

et al. 2017

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“…Such alterations have shown alternating shape transitions and deformation changes between neighboring isotopes. This was observed in mercury [1,2], gold [3][4][5], and to a lesser degree in platinum isotopes [6,7]. Different deformations have also been observed in the states of the same nucleus.…”

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confidence: 92%

Nuclear Moments and Deformation Change inA184ug,m
Blanc
¹
,
Obert
²
,
Oms
³

et al. 1997
Phys. Rev. Lett.
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Resonance ionization spectroscopy (RIS) was performed on desorbed Au, and the complete hyperfine spectrum of both isomeric and ground states of the short lived 184 Au nucleus has been recorded from the 5d 10 6s 2 S 1͞2 ! 5d 10 6p 2 P 3͞2 optical transition. The nuclear moments of both states and the mean square charge radius changes were measured. The magnetic moments were determined to be m 184g Light gold isotopes belong to a mass region where drastic changes in the nuclear charge radius have been measured by laser spectroscopy. Such alterations have shown alternating shape transitions and deformation changes between neighboring isotopes. This was observed in mercury [1,2], gold [3][4][5], and to a lesser degree in platinum isotopes [6,7]. Different deformations have also been observed in the states of the same nucleus. The best example is 185 Hg where the large radius difference measured between its ground and isomeric state [8] has shown a prolate-oblate shape coexistence which was confirmed later from g-ray spectroscopic studies [9,10].In this context, the doubly odd nucleus 184 Au with its isomeric state at 68 keV excitation energy [11,12] is particularly interesting to investigate since it is located in the middle of this transitional region [13,14]: States corresponding to prolate and oblate or triaxial shapes coexist in 183,185 Au [9,15,16] and 185 Hg, while 183 Pt is prolate in all its low energy states [17][18][19]. Several nuclear spectroscopy studies were performed on 184 Au, and it has been established that (i) a shape coexistence is excluded at low excitation energy [20], and (ii) the spin and parity are 5 1 for the ground state and 2 1 for the isomer with the following proton-neutron ͑p ≠ n͒ configurations: ph 9 2 ≠ n 7 2 ͓514͔ and ph 9 2 ≠ n 1 2 ͓521͔, respectively [21]. Furthermore, calculations using rotor 1 one-quasiparticle and rotor 1 two-quasiparticle coupling models were performed on the N 105 isotones 183 Pt, 182 Ir [22], 185 Hg, and 184 Au [23]. They show that the relative energy location of the 5 1 and 2 1 states suggests a deformation change, either between 184 Au g and 184 Au m or between 184 Au and its neighboring isotopes. Therefore, the determination of the quadrupole moment in both isomer and ground states, as well as the change in the mean square charge radius between them, is crucial to fully characterize their nuclear shape. Moreover, a measurement of the magnetic moments of the two states will allow a clear confirmation of the p ≠ n configurations. In addition, the p ≠ n coupling scheme can be defined from the quadrupole moment values.In this Letter, we present optical measurements on 184 Au. The hyperfine structure is measured providing the magnetic A and electrostatic B hyperfine constants of the levels involved in the atomic transition as well as the isomeric shift. A is related to the magnetic moment m I , and B to the spectroscopic quadrupole moment Q s . The isomeric shift, which is the displacement of the centers of gravity of the two hyperfine spectra, determines the...

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“…For the first time a coherent study of the transitional nuclei of the refractory elements below Hg has been achieved. This work goes far beyond similar experiments at ISOLDE [1] and ISOCELE [2]. These nuclei have also been investigated extensively by nuclear spectroscopy studies using on-line mass separators [3,5] and heavy-ion reactions [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Sauvage

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et al. 2000

Hyperfine Interactions

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Laser spectroscopy measurements have been carried out on very neutron-deficient isotopes of Au, Pt and Ir, produced as daughter elements from a Hg ISOLDE beam. For these transitional region nuclides, the hyperfine structure (HFS) and isotope shift (IS) were measured by Resonance Ionization Spectroscopy (RIS). Magnetic moments µ, spectroscopic quadrupole moments Qs and changes of the nuclear mean square charge radius δ r 2 c along isotopic series have been extracted. For some results, a detailed comparison with theoretical predictions is presented.

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Shape transition in neutron deficient Pt isotopes

Cited by 57 publications

References 22 publications

In-gas-cell laser spectroscopy of the magnetic dipole moment of the N≈126 isotope Pt199

In-gas-cell laser spectroscopy of the magnetic dipole moment of the N≈126 isotope Pt199

Nuclear Moments and Deformation Change inA184ug,m
Blanc
¹
,
Obert
²
,
Oms
³

et al. 1997
Phys. Rev. Lett.
Self Cite
46
0
19
0
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Shape transition in neutron deficient Pt isotopes

Cited by 57 publications

References 22 publications

In-gas-cell laser spectroscopy of the magnetic dipole moment of the N≈126 isotope Pt199

In-gas-cell laser spectroscopy of the magnetic dipole moment of the N≈126 isotope Pt199

Nuclear Moments and Deformation Change inA184ug,mBlanc1, Obert2, Oms3 et al. 1997Phys. Rev. Lett.Self Cite460190View full textAdd to dashboardCite

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Nuclear Moments and Deformation Change inA184ug,m
Blanc
¹
,
Obert
²
,
Oms
³

et al. 1997
Phys. Rev. Lett.
Self Cite
46
0
19
0
View full text Add to dashboard Cite