Nuclear magnetic and quadrupole moments for nuclear structure research on exotic nuclei

Neyens, G.

doi:10.1088/0034-4885/66/4/205

Cited by 187 publications

(164 citation statements)

References 199 publications

(226 reference statements)

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“…The calculated deformation parameters β 2 are positive, and indicate the prolate deformation for the isomeric states with I π = 13/2 + . The Hg and Pb isotopes with I π = 13/2 + were reported to be prolate deformation with β 2 ∼ 0.09 and 0.03 [42], respectively. This systematic was consistent with the present theoretical calculation.…”

Section: Discussionmentioning

confidence: 99%

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: Discussionmentioning

confidence: 99%

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

et al. 2017

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“…Examples from the present studies, where isomers have provided the sensitivity required to study nuclei that are difficult to access, include the cases of 206 Hg [3] and 211 Pb [4]. Isomerism also enables the measurement of detailed properties such as electromagnetic moments [5].…”

Section: Introductionmentioning

confidence: 99%

High-spin yrast structure ofHg204from the decay of a four-hole,22+isomer

et al. 2015

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“…Interpretation of the measured magnetic moments can help to determine which of these three options is the leading configuration of the ground state and, consequently, what its parity is. Assuming weak coupling of protons and neutrons, and using the additivity rule for moments [31], the magnitude and sign of the magnetic moment for these three configurations is calculated. For the single proton and neutron configurations, respectively the free nucleon, effective, and empirical moments are used and the results are presented in Table II 56 Ni core with a proton and neutrons in the f 5/2 pg 9/2 orbits.…”

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confidence: 99%

Experimental determination of anIπ=2−ground state inCu72

et al. 2010

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This article reports on the ground-state spin and moments measured in 72,74 Cu using collinear laser spectroscopy at the CERN On-Line Isotope Mass Separator (ISOLDE) facility. From the measured hyperfine coefficients, the nuclear observables µ( 72 Cu) = −1.3472(10)µ N , µ( 74 Cu) = −1.068(3)µ N , Q( 72 Cu) = +8(2) efm 2 , Q( 74 Cu) = +26(3) efm 2 , I ( 72 Cu) = 2, and I ( 74 Cu) = 2 have been determined. Through a comparison of the measured magnetic moments with different models, the negative moment reveals a strong πf 5/2 ⊗ νg 9/2 component in the ground-state wave function. Consequently, a negative parity has been assigned to the ground states of 72,74 Cu. Large-scale shell-model calculations illustrate the strong sensitivity of the nuclear moments to configuration mixing and to the effective interaction employed. The neutron-rich nuclei surrounding the Z = 28 and N = 50 shell closures have received a great deal of experimental and theoretical attention in the last decade. This region presents a key proving ground for the latest shell-model interactions, since it offers an attractively simple structure of the excited states in terms of particle-particle or particle-hole couplings. A compelling question in this region is related to the rapid reduction in energy of the 5/2 − state as the νg 9/2 orbital is filled in the Cu isotopes [1,2]. Given that this state remains static at approximately 1 MeV as neutrons fill the fp shell, its abrupt change at N = 40 garnered a great deal of interest and motivated further experimental and theoretical attention [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A major step in understanding the evolution of nuclear structure in this region was the suggestion to include the monopole term from the tensor force interaction [18,19]. This work predicted a reduction in energy of the 5/2 − state and an inversion with the 3/2 − state in the mid-shell region, which was recently confirmed to occur at N = 46 in the odd-Cu isotopes [20]. Effective shell-model interactions which include this effect have recently been developed in the fpg model space. Two of these interactions start from a 56 Ni core [21,22], while the most recent one also includes excitations of protons from the πf 7/2 orbit across Z = 28 [23]. The odd-odd Cu isotopes are an ideal testing ground for these models, as their properties are extremely sensitive to the proton-neutron interaction.Recent beta-decay studies of 72 Ni [8] have tentatively assigned a spin I = 2 to the ground state (gs) of 72 Cu. Shell-model calculations, based on effective and realistic interactions, could not reproduce such gs spin [8], but placed the 2 − and 2 + states around 400 keV. A gs spin I = 2 is particularly interesting since the spins of 71,73 Cu now have been measured as I = 3/2, and their magnetic moments are compatible with a leading πp 3/2 configuration [20]. However, a [πp 3/2 ⊗ νg 3 9/2 , σ = 1] cannot couple to spin 2, so this configuration cannot be the leading term in the gs wave function of 72 Cu. Alternatively it could be...

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Nuclear magnetic and quadrupole moments for nuclear structure research on exotic nuclei

Cited by 187 publications

References 199 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

High-spin yrast structure ofHg204from the decay of a four-hole,22+isomer

Experimental determination of anIπ=2−ground state inCu72

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