Magnetic moment ofAg104mand the hyperfine magnetic field of Ag in Fe using nuclear magnetic resonance o

Abstract

Nuclear magnetic resonance (NMR/ON) measurements with β-and γ -ray detection have been performed on oriented 104 , the anisotropy of the β particles provided the NMR/ON resonance signal at ν = 627.7(4) MHz. Using the new value for the hyperfine field of Ag in Fe, this frequency corresponds to the magnetic moment µ( 104m Ag) = +3.691(3) µ N , which is significantly more precise than previous results. The magnetic moments of the even-A 102-110 Ag isotopes are discussed in view of the competition between the (πg 9/2 ) −37/2 + (νd 5/2 νg 7/2 ) 5/2 + and the (πg 9/2 ) −3 9/2 + (νd 5/2 νg 7/2 ) 5/2 + configurations. The magnetic moments of the ground and isomeric states of 104 Ag can be explained by an almost complete mixing of these two configurations.

The on-line low temperature nuclear orientation facility NICOLE

“…69 As]=+1.6229 (16) μ N , using the beta-NMR technique at the NICOLE facility [15]. Assuming the odd-proton to be in the f 5/2 shell outside a (Z=20, N=28) core, the moment differed considerably from the π f 5/2 single particle value obtained with g factors for a free proton.…”

“…To improve on the previous value of B hf acting on silver implants in iron, the ground state of ) has been subject to NMR. Combining the resonance frequency with the known magnetic moment of this isotope, the hyperfine field of Ag was found to be |B hf (AgFe)|=44.709(35) T [16]. Detailed analysis of other relevant data available in the literature yielded three more values for this hyperfine field.…”

“…This improvement was achieved by using a new value of the hyperfine field of Ag in iron, determined as described in section 3.1. The systematics of magnetic moments of even-A 102-110 Ag was discussed in terms of mixing between the p (ν d 5/2 ν g 7/2 ) 5/2+ configurations [16].…”

“…The mass-separated molecular 180m HfF 3 + beam from the ISOLDE mass separator [21] was implanted into an iron foil maintained at mK temperatures, producing higher degrees of polarization than were achieved in previous studies [22]. The value found for the irregular E2/M2 mixing ratio ε=−0.0324 (16), is in close agreement with the previous published average value ε=−0.030(2) [22], in full confirmation of the presence of E2 admixture in the 501 keV transition. The temperature dependence of the forward-backward asymmetry has been measured over a more extended range of nuclear polarization than previously possible, giving further evidence for parity mixing of the 8 − and 8 + levels and the deduced E2/M2 mixing ratio.…”