Low lying levels of Fe55

Angular distributions of 413 and 1,322keV gamma rays from the Mn⁵⁵(p,nγ)Fe⁵⁵ reaction and the (n-γ) angular correlation measurements have been measured at proton energies below 2.50 MeV. The experimental results show agreement with the Sheldon formula. The multipole mixture parameters for the 933 and 1,322 keV gamma rays in Fe⁵⁵ have been determined. The sum coincidence technique is used to give some information about the scheme of excited levels in the Fe⁵⁵ nucleus.     

Levels in124Te populated in the decay of124Sb

The levels in¹²⁴Te have been investigated by studying the gamma rays emitted following the decay of 60d¹²⁴Sb. Gamma-gamma coincidence spectra have been taken with gates set at 603, 646, 709, 714 and 723 keV gamma rays by using 105 cm³ Ge(Li)-110 cm³ HPGe coincidence system. 69 gamma rays have been observed and nine of them are reported for the first time. Four new levels in¹²⁴Te at 2512, 2550.2, 2808 and 2814.5 keV are proposed. Levels reported in literatures at 2412 and 2733 keV are excluded from the level scheme of¹²⁴Te based on the present study. The experimentally determined energy spectrum of low-lying positive parity states, B(E2) ratios and electric quadrupole moment of the first excited state are compared with the IBM-1 predictions.     

Low lying energy levels of CsFeCl3

Submillimeter wave ESR has been performed to investigate the singlet ground state and the first excited doublet of the quasi-1D hexagonal magnet CsFeCl₃ at 4.2 K. Using backward travelling wave tubes of 220 GHz and 370 GHz bands combined with pulsed magnetic fields up to 10 T, we succeeded in observing all five possible transitions for H//c and HIc for the first time. The results suggest that the single ion model is not applicable to this system in order to interpret all the absorption lines observed in our experiment.     

Low lying energy levels of56Fe from γ-γ coincidences

The level scheme of⁵⁶Fe was built up from γ-γ coincidence measurements using Ge(Li) detectors and a Dual Parameter data collection system. The previously suggested γ-transitions [8] of 263.3, 410.9, 485.2, 674.7 and 1,462.3 keV were confirmed and evidence found for a new 655.0 keV γ-transition between the levels at 4,100.32 and 3,445.32 keV. No evidence was found for the transition of 2,657.4 keV and the previously proposed β⁺-feeding of the level at 3,600.3 keV is ruled out, while the existence of a level at 4,447.5 keV is suggested. The relative intensities and branching ratios of 44 transitions were determined. A calculation of experimentalK-shell internal conversion coefficients α(K) showed large discrepancies from previous studies for the 3,009.6 and 3,451.2 keV transitions, the latter being assigned a different multipolarity. Logft values were calculated and spins and parities of the levels deduced. In particular the assignment of 3⁺ is verified for the level at 4,297.97 keV.     

Low lying octupole excitations in 15N

The inelastic electron scattering form factors for the $\text{5.27}\text{MeV}\text{(}\text{5}\text{2}{}^{\mathrm{+}}\text{), 7.15}\text{MeV}\text{(}\text{5}\text{2}{}^{\mathrm{+}}\text{), 7.30}\text{MeV}\text{(}\text{3}\text{2}{}^{\mathrm{+}}\text{)}\text{and}\text{7.56}\text{MeV}\text{(}\text{7}\text{2}{}^{\mathrm{+}}\text{)}$ levels have been measured in the momentum transfer range between 0.6 and 1.1 fm^?1. The resulting B(E3) values are discussed in terms of weak coupling models and the spherical shell model of Zuker, Buck and McGrory.     

Low lying excitations in a pair-potential well

Recently a new method has been developed for solving the Bogoliubov equations in the absence of magnetic field. In this work we apply the method to calculate low-Lying bound states in a paramagnetic-superconducting contact. It is assumed that the pairpotential drops from its bulk value inside the superconductor to zero at the interface, with finite slope. Impurity scattering is neglected. No sharp energy gap is found in the limit of vanishing thickness of the paramagnetic normal layer contrary to former work. The influence of neglecting a small term in the kinetic energy investigated. It is shown that for bound states the correction to the energy due to this term in the first order perturbation theory is zero.     

Low energy nuclear states in124Te

The energy level scheme of¹²⁴Te has been established on the basis of singlesγ-spectra, andγ-γ coincidence measurements carried out using a dual parameter data collection system. Ge(Li) detectors were used to study the gamma spectra produced in theβ ^? decay of¹²⁴Sb. Eleven new transitions and two new energy levels are proposed. Relative intensities, branching ratios,α(K) and logft values were calculated and multipolarities, spins and parities deduced. Comparisons are made with predictions of the Interacting Boson Model: in a first order perturbation approximation to theSU (5) limit, using the complete IBA-1 Hamiltonian, and in theO(6) limit.     

124Ba Decay to the 55 124 Cs69 low-spin levels

The decay of¹²⁴Ba to the levels of odd-odd¹²⁴Cs has been studied with on-line mass-separated sources delivered at the Isocele facility. The energy level scheme has been established fromγ-ray singles,γ?γ?t coincidence ande?γ?t coincidence spectra. Spin and parity of several low-lying levels have been assigned on the basis of internal conversion coefficient measurements andβ-branchings. A completely new level pattern including approximately 50 levels and 180γ-rays is proposed for¹²⁴Cs. Several features of this level scheme are discussed and compared to those of neighbouring isotopes.     

Investigation of the low lying levels in9B

The reaction¹⁰B(³He, α)⁹B(p)⁸Be(g.s.) has been studied using a 1.8 MeV³He⁺ beam. Coincidence spectra were measured at θ_α=?150? and θ_α=22.5?, 30?, 37.5?, 45?, 52.5?, 60? and 67.5? for the indentification of the levels in⁹B which decay by proton emission. Possible new excited levels in⁹B were observed at (1.9±0.1), (2.1±0.1), (2.6±0.1) and (3.1±0.1) MeV.     

Electromagnetic properties of low lying levels in75As

Theg-factors of the 265 and 280 keV levels have been measured to be 0.61±0·16 and 0·30±0·05 respectively. The PAC technique was used for the measurements. In addition, the half-life of the 280 keV level has been remeasured to beT _1/2=0·32±0·02 ns using γ-γ delayed coincidences. Electromagnetic properties of the various levels calculated on the core-particle coupling model agree with the experimental results. The results are compared with other existing theoretical calculations.     

Low lying 8 and 12 hole states in light nuclei

The positions of 4, 8 and 12 hole states in alpha particle nuclei from ²²⁰Ne to ⁵²Fe are calculated using a j dependent monopole-monopole interaction with an A⁻¹ dependence. The 12 hole states in ⁴⁰Ca and ⁴⁴Ti are lower than the 8 hole states and are calculated to be at 5 and 3 MeV respectively. B(E2)'s are calculated for ⁴⁰Ca and the nature of the 5.21 MeV state is discussed.     

Messung der Zirkularpolarisationskorrelation bei Fe59, Sb124 und Ru103

TheΒ-γ circular polarization asymmetry for three nuclides has been measured using a special polarimeter developed at Karlsruhe. The results of the measurements are

Low lying structural instabilities and entropy of monoatomic liquids

The entropy of simple liquids is calculated within a model which reproduces the observed volume and entropy changes at the melting point reasonably well. The model is based on a sequeezed-atom instability originally proposed to explain low lying excitations in glasses. The process of flowing can be understood qualitatively in terms of formation and annihilation of these structural instabilities.     

Low lying states of 96Tc

The ⁹⁶Mo(p, n) and ⁹⁶Mo(p, nγ) reactions have been studied for proton energies between 3.8 and 5.5 MeV. Energy levels in ⁹⁶Tc up to 632 keV excitation energy have been determined. Possible spin and parity assignments are given for several levels based on the neutron enhancement and angular distributions observed on and off resonance of the $\text{5}\text{2}{}^{\mathrm{>+}}$ isobaric analog state in ⁹⁷Tc, as well as the observed γ-yields. The first excited state reported at 34 keV was found to be a close doublet only 0.8 keV apart. The observation of this doublet in the (p, n) reaction was used to determine the ground state Q-value Q = ? 3.760±0.010 MeV.     

Low lying excited states of the bound exciton in a spherical model

We report the calculation of the S-like excited states of the bound exciton produced by exciting the outer particle. We find that in spherical model for all but very small (?0.03) and very large (?10) mass ratios these states are unbound. We have tentatively identified some of the excited states as being those observed for the donor bound exciton in Gap.     

Nuclear level structure of low lying levels of109Cd

Nuclear level structure of low lying levels of¹⁰⁹Cd from¹⁰⁹In decay has been investigated by gamma-gamma angular correlation experiments using a Ge(Li)-NaI(Tl) fast coincidence arrangement. From the measurement on the 347.4?326.3, 347.4–650.1, 287.7–650.1, 203.3–420.5, 203.3–619.3 keV cascades spin-parity assignments of 5/2⁺,1/2⁺,7/2⁺,5/2⁺, 7/2⁺,5/2⁺,9/2⁺, and 9/2⁺, have been made to the ground, 59.5, 203.3, 347.4, 623.8, 673.7, 822.5 and 997.5 keV states, respectively, of¹⁰⁹Cd. The results have been discussed and compared with the previous works.     

Excited levels in the neutron deficient nucleus111Sb

The level scheme of the neutron deficient isotope¹¹¹Sb up to about 3.7 MeV is established from in-beam gamma-ray spectroscopy experiments. The identification of the reaction channel using cross bombardments:⁹⁵Mo+¹⁹F (56–68 MeV),¹⁰⁶Cd+⁷Li (20–30 MeV),¹⁰²Pd+¹¹B (45 MeV), charged partice-γ and neutron-γ coincidences is discussed.     

In-source resonance ionization spectroscopy of high lying energy levels in atomic uranium

In-source resonance ionization spectroscopy of uranium has been carried out as preparation for the analysis of low contaminations of nuclear material in environmental samples via laser mass spectrometry. Using three-step resonance ionization spectroscopy, 86 levels of odd parity in the energy range from 37,200–38,650 cm^???1 were studied, 51 of these levels were previously unknown. Suitable excitation schemes for analytic applications are discussed.     

Spin values of the low lying nuclear levels of201Hg

Gamma-gamma directional correlations have been investigated for the cascades of 135-30 keV and 135-32 keV in²⁰¹Hg from the decay of²⁰¹Tl. A combination of NaI (Tl) and Si (Li) detectors was used for the experiments. Spin values ofI=1/2, 3/2 and 1/2 have been assigned to 1.58, 32.19 and 167.49 keV energy levels. In addition, the relative intensities of theγ rays have been measured with a Ge (Li) detector system. The results are 2.2±0.2, 2.2±0.2, 26.5±1.3, 1.6±0.1 and 100 for theγ rays of 30.60, 32.19, 135.34, 165.88 and 167.43 keV energies, respectively.