Level-crossing-Untersuchung der Hyperfeinstruktur des 3d 10 4p 2 P 3/2-Terms von Cu63 und Cu65

Ney, J.

doi:10.1007/bf01330908

Cited by 43 publications

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“…The obtained values for 63,65 Cu are in agreement with literature [26,27]. For 62 Cu, 64 Cu and 66 Cu the ratio of hyperfine parameters was fixed to the literature value 30.13(2) [26,27]. The results of 71−75 Cu have already been published in [14,28].…”

Section: Resultssupporting

confidence: 80%

Nuclear spins, magnetic moments, and quadrupole moments of Cu isotopes fromN=28toN=46: Probes for core polarization effects

et al. 2010

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Measurements of the ground-state nuclear spins and magnetic and quadrupole moments of the copper isotopes from 61 Cu up to 75 Cu are reported. The experiments were performed at the CERN online isotope mass separator (ISOLDE) facility, using the technique of collinear laser spectroscopy. The trend in the magnetic moments between the N = 28 and N = 50 shell closures is reasonably reproduced by large-scale shell-model calculations starting from a 56 Ni core. The quadrupole moments reveal a strong polarization of the underlying Ni core when the neutron shell is opened, which is, however, strongly reduced at N = 40 due to the parity change between the pf and g orbits. No enhanced core polarization is seen beyond N = 40. Deviations between measured and calculated moments are attributed to the softness of the 56 Ni core and weakening of the Z = 28 and N = 28 shell gaps.

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Section: Resultssupporting

confidence: 80%

Nuclear spins, magnetic moments, and quadrupole moments of Cu isotopes fromN=28toN=46: Probes for core polarization effects

et al. 2010

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“…A and B coefficients for I = 2, along with deduced moments, are shown in Table I. The moments were deduced relative to 65 Cu, using A( 2 S 1/2 ) = 6 284.405(5) MHz, B( 2 P 3/2 ) = −25.9(6) MHz, µ( 65 Cu) = +2.3817(3)µ N , and Q( 65 Cu) = −19.5(4) efm 2 [28][29][30].…”

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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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“…Both isotopes have nuclear spinI--3/2 and 63/~i=2.21750 , 6s/~i=2.375541 [12,13]. This was done for the ground state 3dl~ and the two J.-L. Heully: 42S1/2, 42P1/2, 42pa/2 States in the 3dl~ Configuration of Cu first excited states in this configuration 3da~…”

Section: Resultsmentioning

confidence: 98%

Calculation of the hyperfine structure of the 42 S 1/2, 42 P 1/2, 42 P 3/2 states in the 3d 10 nl configuration of Cu

Heully

1984

Z Physik A

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The hyperfine structure of the 42S1/2, 42P1/2, 42P3/2 states in the 3dl~ configuration of Cu has been evaluated using many-body perturbation theory. Polarisation effects were included in all orders and correlation to third-order. By the use of iteration methods, a large number of higher order diagrams were also included. The correlation effects between the valence electron and the 3d shell were found to be very important. The results for A(2S1/2) and A(2P1/2) 5827MHz and 440 MHz, respectively, are in good agreement with the experimental results, whereas the result for A(EP3/2)= 83 MHz is far from the experimental value. No explanation was found for the discrepancy. The quadrupole values were found to be -206 mb for 63Cu and -185 mb for 65Cu.

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Level-crossing-Untersuchung der Hyperfeinstruktur des 3d 10 4p 2 P 3/2-Terms von Cu63 und Cu65

Cited by 43 publications

References 0 publications

Nuclear spins, magnetic moments, and quadrupole moments of Cu isotopes fromN=28toN=46: Probes for core polarization effects

Nuclear spins, magnetic moments, and quadrupole moments of Cu isotopes fromN=28toN=46: Probes for core polarization effects

Experimental determination of anIπ=2−ground state inCu72

Calculation of the hyperfine structure of the 42 S 1/2, 42 P 1/2, 42 P 3/2 states in the 3d 10 nl configuration of Cu

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