Energies of the n2S12 and n2D32,52 states of Cs

Using the technique of Doppler-free two-photon spectroscopy the energies of the n²S_{$\text{1}\text{2}$} (12 ? n ? 35) and n²D_{$\text{3}\text{2}$,$\text{5}\text{2}$} (11 ? n ? 48) states of CsI have been measured with a thermionic detector. The absorption spectrum of molecular iodine was used as a reference giving us a total estimated accuracy of about 2 × 10^-7. Taking also into account the energies of the 7–11 ²S_{$\text{1}\text{2}$} and 5 and 6 ²D_{$\text{3}\text{2}$,$\text{5}\text{2}$} states measured by other authors and using an extended Ritz-formula we found the ionization limit to be E_i = 31406.468 ± 0.006 cm^-1.     

Laser spectroscopy investigation of the hyperfine structure of highly excited 2P32 states in alkali atoms

Highly excited ²P_{$\text{3}\text{2}$} levels in alkali atoms were populated using a multi-step excitation, involving a tunable dye laser. The hyperfine structure of the 9 ²P_{$\text{3}\text{2}$} level in ⁸⁷Rb and the 11, 12 ²P_{$\text{3}\text{2}$} levels in ¹³³Cs was determined with optical double resonance.     

Collisional quenching of HgBr(B2∑+12)

Rate coefficients for the quenching of HgBr(B²∑⁺_{$\text{1}\text{2}$}) by HgBr₂, H₂, CO₂, CO, O₂, N₂, Xe, and Br₂ are reported. HgBr(B²∑⁺_{$\text{1}\text{2}$}) is formed by the photolysis of HgBr₂ with the output from an ArF laser. The rate coefficients are determined by monitoring the time resolved B²∑⁺_{$\text{1}\text{2}$} → X²∑⁺_{$\text{1}\text{2}$} emission as quenching species are added. Radiative lifetimes at particular emission frequencies are also reported, and quenching mechanisms are discussed.     

S12-P12-lambshift in the n = 5 and n = 6 states of ionized helium

The S_{$\text{1}\text{2}$}-P_{$\text{1}\text{2}$}-splittings in the n = 5 and n = 6 states of He⁺ have been determined by an r.f. method to be (905.2 ± 1.0) MHz and (526.7 ± 2.5) MHz, respectively (theory: 906 and 524.2 MHz). The electric fields in the resonance cell and their dependence on the experimental parameters have been examined.     

On spin-52 gauge fields

We present and discuss the theory of free, massless gauge fields with spin $\text{5}\text{2}$.     

Lifetime measurements of the metastable 1s2s2p 4P52 state in the lithium-like N,O and Ne

Lifetimes of the metastable three electron 1s2s2p ⁴P_{$\text{5}\text{2}$} state have been studied with a time-of-flight beam-foil technique. The lifetimes were measured to be 53.5 ± 13, 20.0 ± 3 and 10.4 ± 1.5 nsec for nitrogen, oxygen and neon respectively. Lifetimes and energies of this state are in excellent agreement with theoretical values.     

The rotational bands 12+[411]and 12−[541]in 175Lu

In a study of the γ-radiation emitted in the reaction ¹⁷⁶Yb(p, 2n) excited states of the nucleus ¹⁷⁵Lu up to spin I = $\text{13}\text{2}$ have been investigated. The main results concern the rotational bands $\text{1}\text{2}$⁺ [411]and $\text{1}\text{2}$^? [541]with the corresponding band heads found at 626.60 and 370.88 keV, respectively. The half-life of the $\text{1}\text{2}$⁺[411] level has been determined to be $\text{T}{}_{\mathrm{<mtext>1</mtext><mtext>2</mtext>}}\text{= 10.7±0.5}\text{ns}$. Furthermore, the band heads $\text{3}\text{2}$^?[532]and $\text{3}\text{2}{}^{\mathrm{+}}$[411]are proposed at energies of 999.0 and 1150.8 keV, respectively. Experimental E1 transition probabilities between both $\text{K =}\text{1}\text{2}$ bands are compared with calculations including the Coriolis and pairing effects, as well as theoretically deduced quadrupole deformation parameters.     

Investigation of i132 excitations in 197Hg and 191Pt

The level schemes of the odd-neutron nuclei ¹⁹⁷Hg and ¹⁹¹Pt have been studied using in-beam spectroscopic methods. Energies, intensities, angular distributions and coincidences of the γ-rays following (α, 2n) reactions were measured. Also conversion electrons and delayed γ-ray spectra were recorded. Most of the levels in both nuclei are de-populated via the $\text{13}\text{2}{}^{\mathrm{+}}$ isomers. Besides the yrast states, several additional states with spin values between $\text{13}\text{2}$ and $\text{21}\text{2}$ were identified. The negative parity of a side band in ¹⁹⁷Hg starting with an $\text{f =}\text{21}\text{2}$ state was proved by the conversion electron measurement. The families of positive-parity states were compared with model calculations where the core was described as rigid triaxial rotor or anharmonic vibrator. For ¹⁹⁷Hg both models give similarly good results for the energy spectrum and the branching ratios of electromagnetic transitions. Several negative-parity states found in ¹⁹⁷Hg are compared with the predictions of a pairing-plus-quadrupole model.     

Facteur de lande du niveau 83S1 du mercure

The g_J factor of the 8³S₁ state of mercury has been measured with two different techniques. The obtained value is of the same order of magnitude as for the 7³S₁ state and larger than the Landé factor of the free electron.     

Transient field g-factor measurements for the 321+ AND 521+ states in 31P

Transient field integral precession measurements have been performed on the first two excited states of ³¹P with the IMPAC technique on recoil into magnetized iron. The results were analyzed with an empirical parametrization of the transient magnetic field for light nuclei. This yields g-factors of $\text{g(}\text{3}\text{2}{}^{\mathrm{+}}\text{) = +0.20±0.05}\text{and}\text{g(}\text{5}\text{2}{}^{\mathrm{+}}\text{) = +1.13±0.18}$ for the first and second excited state, respectively. These results are compared with calculations, which reproduce the measured values rather well.     

The vibration spectra of the intercalation complexes TaS2·(pyridine)12 and NbS2·(pyridine)12

Using incoherent inelastic neutron scattering we have obtained the vibration spectra of the MS₂ ·(pyridine)_{$\text{1}\text{2}$} complexes (M = Nb, Ta) between 200 and 1000 cm^-1. The vibrations of the pyridine have been perturbed upon intercalation but in a different manner to that which occurs on Lewis complex formation. Implications of these results are mentioned.     

Measurements of 12C(π+, πN)11C and 19F(π+, πN)18F cross sections near the 32, 32 resonance

Reaction cross sections for ¹²C(π⁺, πN)¹¹C at 134, 161, 177, and 200 MeV and for ¹⁹F(π⁺,πN) at 161, 177, and 200 MeV were measured by activation methods.     

Integral rotation of 32− levels in 65Zn and 67Zn

Low-lying levels of ⁶⁵Zn and ⁶⁷Zn were excited by the Ni(α, n) reaction using enriched Ni and Ni₁₀Fe₉₀ targets. From the angular distributions of gamma rays, E2/M1 mixing ratios were obtained. In the iron alloy targets, integral spin precession was observed and used to measure the g-factors of two $\text{3}\text{2}{}^{\mathrm{?}}$ levels of ⁶⁵Zn. The results are discussed in terms of the shell and unified models of the odd Zn isotopes.     

The systematics of h112 proton alignment in 157, 158, 159Er

Rotational bands have been observed in ^{157, 158, 159}Er to very high spin ($\text{J ～ 41}\text{h}\text{?}$). Upbends are found, due to the alignment of two h_{$\text{11}\text{2}$} protons at $\text{0.40 ?}\text{h}\text{?}\text{ω ? 0.46}\text{MeV}$ in all bands. A systematic shift with neutron number of the band-crossing frequency is observed and is related to a change in quadrupole deformation ?₂.     

The approximation of the Fermi-Dirac integral F12 (η)

This paper presents the approximation of the Fermi-Dirac integral of order $\text{1}\text{2}$ with a relative error not exceeding 0.4% for any value of the position of the Fermi level.     

Sudden change of quadrupole moment between the first 52− states of 197Hg and 199Hg

Low-temperature time differential perturbed angular correlation experiments with the 164 keV-134 keV cascade of ^197mHg in a zinc matrix give evidence that the hitherto accepted value of the quadrupole moment of the first $\text{5}\text{2}{}^{\mathrm{?}}$ state of ¹⁹⁷Hg is erroneous. A new value is derived from a time differential perturbed angular correlation experiment with the 374 keV?158 keV cascade of ^199mHg implanted into a Be single crystal and comparison with an analogous experiment for ^197mHg. Taking $\text{Q(}\text{5}\text{2}{}^{\mathrm{?}}\text{,}{}^{199}\text{Hg) = +0.95(7)}\text{b}$ we derive $\text{|Q(}\text{5}\text{2}{}^{\mathrm{?}}\text{,}{}^{197}\text{Hg)¦= 0.081(6)}\text{b}$. This change of quadrupole moment is discussed in the framework of the shell model.     

The (7Li, 8Li) reaction to the (h92)−1 state in 207Pb

Relative differential cross sections for the reaction ²⁰⁸ P(⁷Li, ⁸Li) leading to the predominantly single-hole states in ²⁰⁷Pb have been analysed using the DWBA to determine the rms radius of the 1h_{$\text{9}\text{2}$} neutron orbital in ²⁰⁸Pb by comparison with known sizes of the 3p_{$\text{1}\text{2}$} and 2f_{$\text{7}\text{2}$} orbits. The experiment was performed at a beam energy of 52 MeV. The insensitivity of the technique to unknown input parameters to the DWBA analysis is demonstrated and a value of 5.94±0.11 fm for the rms radius of the 1h_{$\text{9}\text{2}$} orbit obtained assuming 70% of the hole strength is concentrated on the $\text{9}\text{2}{}^{\mathrm{?}}$, 3.41 MeV state in ²⁰⁷Pb. Effects due to fragmentation of the different hole strengths are examined and a value of 6.00 ± 0.11 fm is extracted as the best value for the rms radius of the neutron excess in ²⁰⁸Pb. The relevance of these data to mean-field calculations of nuclei is discussed.     

Stark effect investigation of highly excited 2D32 states in 133Cs utilizing a CW tunable dye laser

Stark effect measurements on the 8, 9 and 10 ²D_{$\text{3}\text{2}$} levels in ¹³³Cs were performed with the level crossing technique. The levels were populated using a two-step excitation, involving a tunable dye laser. The sign of the hyperfine constants could be determined.     

Scattering of solitons with fermion number ±12

In a model of a Dirac field coupled to a sine-Gordon system, we have soliton solutions with half-integral fermion number. Scattering problems of such solitons are investigated. For soliton-soliton and soliton-antisoliton solutions, we find explicit solutions to the Dirac equations which are localized at the position of the (anti-)solitons. It is shown that the fermion number is generally transferred between the soliton and the (anti-)soliton in the scattering process.     

New superalgebra and goldstone spin-32 particle

A new supersymmetry group is introduced, whose algebra contains a spinor-vector generator. The non-linear realizations of this group lead to a Goldstone particle of spin-$\text{3}\text{2}$. The introduction of local gauge symmetry (Higgs effect) is discussed.