The g-factor of the 6+ state in 50Ti

The rotation of the angular distribution pattern of the 524 keV γ-radiation from the 6⁺, 3200 keV state in ⁵⁰Ti was measured in an external magnetic field using the ⁴⁸Ca(α, 2n) reaction. The IPAD method was applied. From the experimental precession angle, the value of the g-factor, g = 1.57 ± 0.17, has been derived.     

Measurement of the g-factor of the 0.57 ms 7+ state in202Tl

The spin rotation of the 0.57 ms 7⁺state in²⁰²Tl has been observed by use of a pulsed magnetic field and the g-factor was determined to be 0.128 ± 0.006. The isomeric state was excited via the ²⁰⁴Hg(p, 3n)²⁰²Tl reaction with a 28 MeV pulsed beam of 1.2 ms interval. From the results, the main configuration of the 7⁺ state in²⁰²Tl is interpreted as ().     

The g-factor of the first excited 2+ state in 26Mg from transient field precession measurements

Transient field (TF) precessions of the first excited 2⁺ state in ^24,26Mg have yielded g = +0.50 (13) for ²⁶Mg. Contrary to an earlier measurement the present data is in good agreement with Hartree-Fock calculations. The large effective TF of 280 (30) T at Mg nuclei for ν_ion ≈ 2.0 ν₀ is attributed to K-shell polarization of the ions.     

Recoil-distance measurements of the g-factor of 22Ne(21+)

Time-differential recoil-into-vacuum measurements with a plunger have been performed on the first-excited I^π = 2⁺ state of ²²Ne. The state was populated with the ⁴He(¹⁹F, p)²²Ne reaction on ⁴He-implanted foils. The measurements lead to a $\text{g-}\text{factor}\text{of}\text{¦g¦ = 0.326 ± 0.012}$ and to a mean life of τ_m = 5.2 ± 0.3 ps. The analysis also yields the population of excited two-electron ions and indicates that the population may depend on the thickness of the ¹²C contamination layer through which the ions recoil into vacuum.     

g-factor of the 91.5 keV state in 151Sm

The g-factor of the 91.5 keV state in ¹⁵¹Sm has been measured by the TDPAC method using γγ cascades following the β-decay of 28 h ¹⁵¹Pm. The result is g = ?0.21±0.01. The anisotropy of the angular correlation for the 232.2-25.7 keV cascade is measured to be A = +0.058±0.006. From this an M1/E2 mixing ratio of δ² = 0.008±0.002 for the 232.3 keV transition is concluded. No attenuation of the anisotropy of the angular correlation is observed for aqueous solution sources of SmC1 in excess of hydrochloric acid. Spin and parity assignments for excited states in ¹⁵¹Sm are presented.     

The g-factor and lifetime of the 3− (298 keV) state in 16N

The g-factor of the 3^? (298 keV) state in ¹⁶N has been measured by observing the hyperfine modulation of the γ-ray anisotropy in one-electron ions recoiling in vacuum following the ²H(¹⁵N, p)¹⁶N reaction. From the observed spatial frequency the g-factor was deduced to be |g| = 0.532±0.020. Simultaneous lifetime determinations for this state and the 1^? (397 keV) state in ¹⁶N gave values of τm = 131.7±1.9 ps and τ_m = 5.63±0.05 ps, respectively. These and other electromagnetic observables associated with the lowest four levels in ¹⁶N are compared to shell-model calculations.     

The g-factor difference for the 61+ and 88+ states in 210Po

The difference in g-factors for the 6₁⁺ and 8₁⁺$\text{(πh}{}_{\mathrm{<mtext>9</mtext><mtext>2</mtext>}}{}^2\text{)}$ states in ²¹⁰Po has been measured as $\text{(g}{}_6\text{? g}{}_8\text{)}\text{g}{}_8\text{= 2.0 ± 0.7\%}$. This result represents a small violation of additivity. A value of g₈ = 0.909 ± 0.011, independent of g₆, was also obtained.     

Measurement of the g-factor and lifetime of the first-excited state of 20O

The g-factor and mean lifetime of the first-excited 2⁺ state at 1.67 MeV in ²⁰O have been determined by means of a plunger set-up. The state was populated by the ³H(¹⁸O, pγ)²⁰O reaction at $\text{E(}{}^{18}\text{O}\text{) = 24.5}\text{MeV}$. The analysis of p-γ anisotropies as a function of flight path of the recoiling ion in vacuum leads to a value for the g-factor of |g| = 0.352±0.015 and to a mean life of τ = 10.7±0.4 ps.     

Nuclear g-factor of the 172+ isomeric state in 63Cu

The nuclear g-factor of the 4498 keV $\text{17}\text{2}$⁺ isomeric state in ⁶³Cu was measured with the in-bearn perturbed angular distribution method, through the ⁶²Ni(α, p2nγ)⁶³Cu reaction, to be g_exp = 0.184 ± 0.012. This value is in good agreement with a semiempirical g-factor for the three-quasiparticle configuration [π2p_{$\text{3}\text{2}$}(v1f_{$\text{5}\text{2}$}, 1g_{$\text{9}\text{2}$})₇]_{$\text{17}\text{2}$⁺} calculated using the experimental single-particle g-factors of neighbouring nuclei. At the same time the internal magnetic field at the Cu nuclei in Ni metal was obtained to be B_int = ?46.6 ± 1.3 kG.     

The 1Σ+-X1Σ+ transition of the PN molecule

The recently observed ¹Σ⁺-X¹Σ⁺ transition of the PN molecule (J. Phys. B.13, 2251–2254 (1980)) has been photographed at high dispersion in the 1600–1900-Å region. A rotational analysis is carried out and shows 11 vibrational levels of the new ¹Σ⁺ state. These levels are perturbed and absolute vibrational numbering cannot be determined. Some perturbations can be accounted for by interactions with the A¹Π state. Weakening of lines are explained as accidental predissociations and allow us to discuss the dissociation energies of the X¹Σ⁺ and A¹Π states.     

Recoil-distance measurements of g-factors for 24Mg(21+) and 20Ne(21+)

Time-differential recoil-into-vacuum measurements have been performed with a plunger on the first-excited I^π = 2⁺ states of ²⁴Mg and ²⁰Ne. The states were populated by the reactions ¹²C(¹⁶O, α)²⁴Mg and ¹²C(¹²C, α)²⁰Ne. The measured anisotropy of the α-γ angular correlation was greatly increased by means of a vertical slit on the annular particle detector. Values of $\text{¦g¦= 0.51 ± 0.02}\text{and}\text{0.54 ± 0.04}$ have been deduced for the ²⁴Mg and ²⁰Ne g-factors, respectively. The mean lives of these states have been determined as τ_m = 2.09 ± 0.13 ps and 0.8 ± 0.2 ps, respectively. Various theoretical calculations are discussed and compared with the measured g-factors.The analysis of the measurement also yields values for the populations of electronic states contributing to the hyperfine interaction. For ²⁰Ne the populations of the different electronic configurations are compared with the results of a separate time-integral measurement, in which the correlations were measured for each ionic state separately. Large fractions of two-electron excited states are found to contribute.     

Spectroscopic analysis of the d1Σ+→a1Σ+ and d1Σ+→b1Π green band systems of XeO

A comprehensive high resolution spectroscopic analysis has been made on the XeO green bands photographed in emission from an RF discharge source. Rotation-vibration constants derived from the analysis of the spectrum of the isotopically enriched species ¹²⁹Xe¹⁶O and ¹²⁹Xe¹⁸O were used to give RKR potential curves for the d¹Σ⁺ and b¹Π states. The bond distances and dissociation energies of the d¹Σ⁺ and b¹Π states were respectively found to be $\text{r}{}_{\mathrm{e}}\text{= 2.852 ± 0.002}\text{A}\text{?}$, D_e = 693 ± 10 cm^?1 and $\text{r}{}_{\mathrm{e}}\text{= 2.548 ± 0.002}\text{A}\text{?}$, D_e = 461 ± 10 cm^?1. For the a¹Σ⁺ state it was not possible to establish a unique vibrational numbering or to construct an RKR potential curve, since observed bands of the d¹Σ⁺→a¹Σ⁺ system involve only high vibrational levels of the a¹Σ⁺ state, which are severely predissociated. The observations are consistent with a fairly deep well, in agreement with the latest ab initio calculations which give a well depth of 0.7 eV.     

Franck-Condon factors and R-centroids for the A1∑+-X1∑+ and B3Π(0+)−X1∑+ band system of 63Cu1H and 63Cu2H

The recently reported new RKR potential energy curves for the X¹∑⁺, A¹∑⁺, and B³Π(0⁺) electronic states of ⁶³Cu¹H and ⁶³Cu²H are used to calculate Franck-Condon factors and r-centroids for the A?X and B?X band systems for 0≤v″≤20, 0≤v′≤10 and J = 0, 30, 40. The r-centroid approximation is verified and a physical interpretation of the r-centroid is discussed.     

Negative-parity states in Pb isotopes: g-factor of the 480 ns,if Jπ = 9− isomer in 200Pb

The g-factor of the 480 ns, 9^? isomer at 2.237 MeV in ²⁰⁰Pb was measured by the time-differential perturbed angular distribution method. The result, g = ?0.0285±0.0011 confirms the rather pure $\text{(}\text{f}{}_{\mathrm{<mtext>5</mtext><mtext>2</mtext>}}{}^{\mathrm{?1}}\text{i}{}_{\mathrm{<mtext>13</mtext><mtext>2</mtext>}}{}^{\mathrm{?1}}\text{)}$ quasiparticle structure of this state. Half-lives of 480±20 ns, 43±3 ns and 42±4 ns have been measured for the 2237 keV 9^?, 2154 keV 7^? states in ²⁰⁰Pb and the 2208 keV state in ²⁰²Pb, respectively; E2 transitions and g-factors of negative-parity states in even, neutron-deficient Pb isotopes are discussed.     

Vibrational analysis of the a3Σ+-X1Σ+ and b3Π-X1Σ+ band systems of GeS

Spectra of GeS have been obtained in a chemiluminescent flame produced by the reaction Ge + OCS → GeS + CO. Neither of the known band systems, D¹Π-X¹Σ⁺ and E¹Σ⁺-X¹Σ⁺, was observed, but two new band systems in the regions 350–400 and 420–650 nm were obtained. By comparison with similar systems in isovalent molecules, these were assigned as b³Π₁-X¹Σ⁺ and a³Σ⁺-X¹Σ⁺, respectively. Vibrational assignments were made with the help of the germanium isotope effect and vibrational constants were obtained for the states involved. Approximate Morse potential Franck-Condon factors were computed and were shown to fit the general trend of the intensity distribution for both systems. Addition of active nitrogen to the flame was shown to increase the intensity of the b-X system by an order of magnitude while hardly affecting the a-X system. Constants (in cm^?1) obtained for the two new states are: a³Σ⁺: T_e = 21986.3 ± 2.3, ω_e = 388.9 ± 1.0, ω_ex_e = 1.35 ± 0.11; b³Π₁: T_e = 27192.0 ± 1.8, ω_e = 435.4 ± 1.1, ω_ex_e = 1.68 ± 0.20.     

Configuration of 3.59 MeV 0+ state in 44Ca

Results obtained with the ⁴⁸Ti(d, ⁶Li) reaction, at E_d = 55 MeV, establish the 3.59 MeV 0⁺ level of ⁴⁴Ca as virtually pure 8 p?4h, with T_h = 0.     

The isospin forbidden 1− → 0+ transition in 40Ca

The isospin forbidden transition 1^? (6.95 MeV) → 0⁺ (g.s.) in ⁴⁰Ca is explained within a model that mixes isospin through single-particle energy differences and the two-body Coulomb interaction. There is no need to introduce an isospin non-conserving part of the nucleon-nucleon interaction to explain this anomalously fast transition.     

Effects of effective potential on g-factor in Si inversion layers

Taking into consideration the effective potential and the magnetic field dependent dielectric function, the effective g-factor and the magnetic susceptibility have been calculated. Results show that both quantities oscillate with magnetic field.The amplitude of the effective g-factor found in this way has the value between 3.26 and 2.49 for surface electron densities n ranging from 1.0×10¹² to 7.0×10¹² cm^-2. The enhancement of g-factor is divided into two parts, noninteracting and interacting part. The interacting part is dominant and shows $\text{n}{}^{\mathrm{<mtext>-3</mtext><mtext>2</mtext>}}$ behavior.     

钾双原子分子21∑+u─x1∑+sub>g跃迁连续谱带研究

理论计算了钾双原子分子21∑+ｕ─ｘ1∑+ｇ跃迁所得到的扩散带荧光谱，并与Gondal等[4]和Luh等[5]以及Milosevic等[6]的实验结果进行了比较。计算结果与Luh等和Milosevic等的实验结果符合很好，排除了600 nm附近扩散带来自Ｋ221∑+ｕ─ｘ1∑+ｇ跃迁的可能性。