Hyperfine structure of CH3OH

Hyperfine structure of the (0, 0, 1) - (1, 0, 1) transition of methanol has been investigated by beam absorption and of the (J, 1, 3?) → (J, 1, 3+) transitions for J = 2, 3, and 6 by beam-maser spectroscopy. The best-fit results for the spin-rotation and spin-spin coupling constants $\text{C}{}_{\mathrm{JK\tau \pm }}{}^{\mathrm{(i)}}$ and $\text{D}{}_{\mathrm{JK\tau \pm }}{}^{\mathrm{(i)}}$, respectively, are in kHz¹: $\text{C}{}_{101}{}^{\mathrm{(1)}}\text{= 2.4(10)}$, $\text{C}{}_{101}{}^{\mathrm{(2)}}\text{= ?0.6(10)}$, $\text{D}{}_{101}{}^{\mathrm{(1)}}\text{= ?13.8(9)}$, $\text{D}{}_{101}{}^{\mathrm{(2)}}\text{= 7.0(9)}$, $\text{C}{}_{\mathrm{213?}}{}^{\mathrm{(1)}}\text{= ?5.0(10)}$, $\text{C}{}_{\mathrm{213?}}{}^{\mathrm{(2)}}\text{= ?5.5(10)}$ and ($\text{C}{}_{\mathrm{J13?}}{}^{\mathrm{(2)}}\text{- C}{}_{\mathrm{J13+}}{}^{\mathrm{(2)}}\text{) = 0.98(9)}$.     

Optical absorption spectrum of VO2+ in calcium tartrate tetrahydrate

Single srystals of calcium tartrate doped with VO²⁺ are grown from silica gel. Its optical absorption spectrum is studied at laboratory and liquid air temperatures. The spectrum is analysed and ascribed to VO²⁺ ion in C_4v symmetry. The following crystal field parameters are evaluated.

$\text{Dq = 1835}\text{cm}{}^{\mathrm{?1}}\text{, Ds = ?1980}\text{cm}{}^{\mathrm{?1}}\text{, Dt = 1280}\text{cm}{}^{\mathrm{?1}}$

     

Coupling constants for several light nuclei from a dispersion analysis of nucleon and deuteron scattering amplitudes

A forward dispersion relation cannot be applied to charged particle scattering amplitudes unless the influence of the Coulomb interaction is explicitly considered. Earlier studies have shown how Coulomb effects can be taken into account when direct (s-channel or bound-state) poles are investigated. In this paper we extend the Coulomb modification to include I = 0 exchange (u-channel) processes as well. We then apply a forward dispersion relation to empirical d + α, p + d and n + d elastic scattering amplitudes which contain both direct and exchange poles with and without Coulomb effects. We obtain detailed and model-independent information on the following vertices: ⁶Li-α-d (S- and D-state) ⁴He-d-d, ³He-d-p, ³H-d-n and d-p-n. From the coupling constants we calculate the asymptotic normalization (spectroscopic factors) C²₁ of the corresponding cluster wave functions, which become: $\text{C}{}^2{}_0\text{(}{}^6\text{Li}\text{, α}\text{d}\text{) = 4.62 ± 0.23}$, $\text{C}{}^2{}_2\text{(}{}^6\text{Li}\text{, α}\text{d}\text{) = (1 ± 6) × 10}{}^{\mathrm{?4}}$, C²₀(α, dd) < 2, $\text{C}{}^2{}_0\text{(}{}^3\text{He, dp}\text{) = 3.5 ± 0.4}$, $\text{C}{}^2{}_0\text{(}{}^3\text{H, dn}\text{) = 2.6 ± 0.3}\text{and}\text{C}{}^2{}_0\text{(}\text{d, np}\text{) = 1.66 ± 0.1}$.     

Prolate deformation in neutron-dificient lanthanum isotopes

The odd-A La isotopes from A = 125 to 137 have been studied by in-beam γ-ray spectroscopy of $\text{Sn}\text{(}{}^{14}\text{N}\text{, x}\text{n}\text{)}\text{La}$ reactions and from A = 131 to 139 by particle spectroscopy of the Ba(α, t) La and Ba(τ, d) La single-proton transfer reactions. In the latter experiments a low-lying$\text{11}\text{2}{}^{\mathrm{?}}$ level was systematically identified, and the rotational bands built on these levels were observed in the γ-ray work. The strong resemblance of the transition energies in these bands to the ground-band transitions in the neighbouring even Ba isotopes is very striking. These results can be understood as a decoupling of an $\text{h}{}_{\mathrm{<mtext>11</mtext><mtext>2</mtext>}}$ single proton from the Ba core. This interpretation of the observed bands requires a prolate deformation for these nuclei, which is in contrast to previous conclusions.     

Band structure in 131,132,133Ba observed by (12C,xn) reactions

High-spin levels in Ba isotopes are observed in the reactions ^122,124Sn(¹²C,3nγ)^131,133Ba and ¹²⁴Sn(¹²C,4nγ)¹³²Ba. They are studied by in-beam spectroscopic methods such as prompt and delayed spectra, excitation functions, γ-γ coincidences and angular distributions. Bands are found on the $\text{11}{}^{\mathrm{?}}\text{2}$ isometric state in ¹³³Ba and on the $\text{9}{}^{\mathrm{?}}\text{2}$ isomeric state in ¹³¹Ba which are in agreement with the structure of other nuclei with 77 and 75 neutrons and with prolate deformation. A negative-parity band with both even- and odd-spin members from 5^? to 9^? is found in ¹³²Ba.