共查询到20条相似文献,搜索用时 0 毫秒
1.
The g-factors of the 10? isomeric states in 202Bi and 204Bi have been measured by the method of in-beam TDPAD. The experimental values confirm the previously suggested shell-model configuration. 相似文献
2.
H. Richel G. Albouy G. Auger F. Hanappe J.M. Lagrange M. Pautrat C. Roulet H. Sergolle J. Vanhorenbeeck 《Nuclear Physics A》1978,303(3):483-499
Level schemes for 201Pb and 199Pb, studied from the radioactive decay of bismuth isobars, are proposed on the basis of γ-ray, electron spectra and γ-γ coincidence measurements. The experimental results are compared mainly with those of two theoretical approaches. 相似文献
3.
F. Bernthal B.B. Back O. Bakander J. Borggreen J. Pedersen G. Sletten H. Beuscher D. Haenni R. Lieder 《Physics letters. [Part B]》1978,74(3):211-214
A new 710 ns isomer in 179W is found to decay directly into backbending region of the gorund-state band. The band is observed up to spin and shows no evidence for backbending at core rotational frequencies, where the effect is observed in the 179W and 180W ground-state bands. 相似文献
4.
W.E. Meyerhof D.L. Clark Ch. Stoller E. Morenzoni W. Wölfli F. Folkmann P. Vincent P.H. Mokler P. Armbruster 《Physics letters. A》1979,70(4):303-306
We have measured the spectra of continuum X-rays above the characteristic K lines for 4.5 to 4.8 MeV/N 20882Pb → 20882Pb, Pb → Bi, Bi → Pb and Bi → Bi collisions. Above ≈400 keV X-ray energy the spectral shape and intensity agree roughly with calculations of Kirsch et al. for the 1sσ molecular-orbital (MO) X-ray spectrum from Pb-Pb. Deviations from the theory below ≈400 keV suggest transitions to other MO's. 相似文献
5.
A long-lived high-spin isometric state in 95Pd with a half-life of 14 ± 1s and with has been identified. It has been found that this state is a β delayed proton precursor. A decay scheme of 95Pd has been derived. 相似文献
6.
7.
We have performed axially symmetric Skyrme force time-dependent Hartree-Fock calculations for the 136Xe + 209Bi system at E(lab) = 940 MeV and 1130 MeV. The evolution of the nuclear geometry is studied in detail. The calculated final fragment kinetic energies, scattering angles, and charges are in good agreement with experiment, but the fragment charge dispersion is greatly underestimated. Studies of head-on collisions for 900 MeV ? E(lab) ? 2000 MeV show no evidence for fusion and indicate a dramatic transparency for E(lab) ? 1500 MeV. 相似文献
8.
C.P. Swann 《Nuclear Physics A》1973,201(3):534-540
The Doppler-broadened 7.117 MeV line from the 19F(p, αγ)16O reaction has been used to resonantly excite levels in 208Pb at 7071±2 and 7091±2 keV, in 207Pb at 7186±5 and 7206±5 keV and in 209Bi at 7179±5 and 7202±5 keV. On the basis of angular distribution measurements the 7071 and 7091 keV levels of 208Pb are assigned spins of 1 and assuming 100% ground state branching the widths are calculated to be 31±3 and 17±2 eV respectively. It is suggested that the states in 207Pb and 209Bi arise from the weak coupling of a neutron hole and an proton respectively to one or the other of the 208Pb levels. The widths obtained in terms of gΓo2/Γ are 15±4 and 25±5 eV for the 7186 and 7206 keV levels of 207Pb and 24±5 and 30±5 for the levels of 209Bi respectively. These values are consistent with the weak-coupling suggestion. 相似文献
9.
The half-life of 207Bi was obtained from the genetic relation between 207Po and 207Bi, and between 211At and 207Bi. The half-life was found to be 33.4 ± 0.8 y. The half-life of 207Po was determined to be 5.81 ± 0.04 h by following the decay of the characteristic γ-rays from 207Po. The half-life of 211 At was determined tobe 7.23 ± 0.02 h by following the decay of γ-rays and α-particles from 211At and 211Po. The half-lives determined in the present work for 207Po and 211At agree with the literature although the half-life of 207Bi differs considerably from the currently accepted value of 38 y. The branching ratio of 211 At decaying through EC and α-decay modes was determined together with the branching ratios of the three α-particles emitted from 211Po. 相似文献
10.
An isomeric 587.3 keV transition was investigated using several target-ion combinations: 197Au+12C, 193Ir+16O and 196Pt+15N. From the measured excitation functions for the At reaction it follows that this transition belongs to 204At. The isomeric level is ascribed to the 10? state of the configuration π(h)3ν(i)?1. 相似文献
11.
D.R. Haenni H. Beuscher B. Bochev T. Kutsarova T. Morek M. Müller-Veggian A. Neskakis C. Mayer-Böricke 《Nuclear Physics A》1981,365(2):229-236
A new 9? isomeric state having a 5.0 ns half-life has been observed in 144Eu following the 144Sm(α, p3n) reactions at 50 MeV. The new isomer most likely has a configuration. 相似文献
12.
An isomer of 161Lu with a half-life of 7.3 ± 0.4 ms has been discovered in the heavy-ion reaction 148Sm(19F, 6n)161mLu. Oneγ-ray transition with energy 135.8 ± 0.2 keV was observed, and a K-conversion coefficient of 1.1 ± 0.3 deduced in the decay of this isomer. 相似文献
13.
Within the theory of finite Fermi systems we calculate the distribution of single-particle strengths in the odd mass nuclei surrounding 208Pb. The Dyson equation with an energy dependent mass operator is solved and the resulting single-particle propagator is analysed. It turns out that the concept of quasiparticles used in this theory is very well justified for nearly all the states in the first and the second shells below and above the Fermi surface. 相似文献
14.
15.
E.M. Szanto A.Szanto De Toledo H.V. Klapdor G. Rosner M. Schrader 《Nuclear Physics A》1983,404(1):142-166
High-spin states in 22Ne have been investigated by the reactions 11B(13C, d)22Ne and 13(11B, d)22Ne up to . Yrast states were observed at 11.02 MeV (8+) and 15.46 MeV (10+) excitation energy. A backbending in 22Ne is observed around spin 8+. The location of high-spin states I ≦ 10 is discussed in terms of the rotational band structure, Strutinsky-type calculations, and pure shell-model predictions. 相似文献
16.
R.F. Davie A.R. Poletti G.D. Dracoulis A.P. Byrne C. Fahlander 《Nuclear Physics A》1984,430(2):454-484
The properties of high-spin states in 205At have been investigated to and an excitation energy of > 4.0 MeV. The properties of the + isomer at 2340 keV have been established and those of the + isomer at 2063 keV have been further investigated. In the present study the mean lives of these isomers have been determined as 11.2±0.2μs and 98±2 ns respectively. The M2 branch of the + state at 970 keV to the + ground state has been measured. This decay is attributed to a proton single-particle transition. The trend of excitation energies of a number of proton excitations in the odd-mass nuclei from 211At to 201At has been compared to the corepolarization model and the average interaction energy has been deduced. Comments are made upon probable configurations for many of the levels. 相似文献
17.
T.R. Canada R.A. Eisenstein C. Ellegaard P.D. Barnes J. Miller 《Nuclear Physics A》1973,205(1):145-167
The γ-decay of excited states in 210Bi up to 3330 keV excitation energy has been studied using the 209Bi(d, pγ)210Bi reaction. From the observed decay scheme, tentative Jπ values are made for 25 states. The excitation energies, (d, p) strengths and decay branching ratios of these states are compared with those calculated using the two-particle shell-model wave functions of Kim and Rasmussen and Kuo and Herling. 相似文献
18.
M. Matoba M. Hyakutake H. Tawara K. Tsuji H. Hasuyama S. Matsuki A. Katase M. Sonoda 《Nuclear Physics A》1973,204(1):129-137
Differential cross sections for the elastic and inelastic scattering of 14.1 MeV neutrons from 209Bi have been measured with a time-of-flight system which had an energy resolution of 650 keV. For elastic scattering from 209Bi, an optical-model analysis gave the best-fit potential parameters. The absolute cross sections for excitation of collective (2.66 and 4.36 MeV) states are reproduced by the results of distorted-wave calculations under the assumption of a core (208Pb) excitation model using deformation parameters obtained from (p, p') reactions. 相似文献
19.
R. Kroth S.K. Bhattacherjee C. Günther M. Guttormsen K. Hardt H. Hübel A. Kleinrahm 《Physics letters. [Part B]》1980,97(2):197-199
The g-factors of the 10+ isomeric states in 194Hg and 196Hg have been measured using the in beam IPAD method. The results and are in agreement with the value expected for an (?2) neutron satructure and clearly contradict the previous assignment as () proton configurations. Cranking model calculations show that the neutron excitation energies in the rotating frame agree satisfactorily with the experimental energies and that the proton excitations are expected ≈2 MeV above the experimental yrast line 相似文献
20.
H. Prade L. Käubler U. Hagemann H.U. Jäger M. Kirchbach L. Schneider F. Stary Z. Roller V. Paar 《Nuclear Physics A》1980,333(1):33-66
High-spin states of 143Pm have been studied in the reactions 141Pr(α, 2n)143Pm and 143Nd(d, 2n)143Pm by means of in-beam spectroscopy. The level scheme, spin and parity assignments are based on results obtained from singles γ-ray spectra, conversion electron spectra, prompt and delayed γ-γ coincidences, γ-ray angular distribution and linear polarization measurements. Positive- and negative-parity states with energies up to 4580 keV and spins up to have been established including 22 new levels. For two nanosecond isomeric states the nuclear spin precession in an external magnetic field was observed providing the following g-factors: The experimental results are well understood by calculations which have been performed in the framework of the shell model (for positive-parity states of 11 valence protons above a Z = 50, N = 82 core) and of the cluster-vibration model (for 3 holes in a Z = 64, N = 82 core). In the case of positive-parity states no evidence for particle-core coupling could be found, while the negative-parity states could qualitatively be understood within the particle-core coupling picture. 相似文献