共查询到20条相似文献,搜索用时 31 毫秒
1.
M. Mizumoto 《Nuclear Physics A》1981,357(1):90-108
Neutron capture and transmission measurements have been carried out on the separated isotopes of 147Sm (98.34 %) and 149Sm (97.72 %) at the 55 m time-of-flight station of the Japan Atomic Energy Research Institute electron linear accelerator. Resonance energies and neutron widths for a large number of resolved resonances were determined up to 2 keV for 147Sm and 520 eV for 149Sm. Radiation widths for 5 resonances in 147Sm + n and 7 resonances in 149Sm + n were derived. The s-wave strength functions, average level spacings and average radiation widths were obtained to be: and ; a and . The average capture cr sections were deduced from 3.3 to 300 keV with an estimated accuracy of 5 to 15 %. The measured capture cross sections for 149Sm are largely different from the evaluated data, which are obtained based on the statistical model calculation. Possible reasons for this disagreement are discussed. 相似文献
2.
The magnetic hyperfine splitting vM=|gμNBHF/h| of 196mAu (jπ=12?; configuration ¦(π(; as dilute impurity in Ni has been determined with nuclear magnetic resonance on oriented nuclei as 96.0(2) MHz. With the known hyperfine field BHF = ?264.4(3.9) kG corrected for hyperfine anomalies the g-factor and magnetic moment of 196mAu are deduced to be |g| = 0.476(7) and |μ| = 5.72(8) μN. Taking into account the known magnetic properties of and isomeric states in the neighbouring odd Pt, Au and Hg nuclei the structure of the 12? state is discussed. 相似文献
3.
J. Rekstad M. Guttormsen T. Engeland G. Løvhøiden O. Straume J. Lien C.E. Ellegaard 《Nuclear Physics A》1979,320(2):239-259
The level structure of 153Sm has been studied by means of the 150Nd(α, n)153Sm reaction. The experiment included measurements of the γ-γ coincidences and γ-ray yield as a function of projectile energy. The rotational band built on the [505] Nilsson orbital was observed up to spin , and two ΔI = 2 bands of positive parity were identified with spins up to , respectively. These bands are associated with the single-particle structure.The data obtained in the present work together with data available in the literature are compared to the result of a particle-rotor coupling calculation. The 153Sm nucleus is found to be a wellbehaved rotor. An appropriate single-particle level scheme for 153Sm is established. 相似文献
4.
The magnetic hyperfine splitting νM = |gμNBHF/h| of ; in Fe has been measured with the technique of nuclear magnetic resonance on oriented nuclei as 320.4(1) MHz. With the known hyperfine field the magnetic moment of the ground state of 175Ta is deduced to be . 相似文献
5.
The quadrupole interaction frequencies in the 5? state of 118Sn have been measured by time differential perturbed angular correlation technique in Sn, Sb and (95% Sn+5% Sb) environments. The ω0 for 116Sn was determined in Sn environment only. With the help of the known electric field gradient 1) of Sn in a Sn lattice the quadrupole moments have been deduced as . These values together with the known2) quadrupole moment of the analogous 5? state in 120Sn are interpreted in terms of the pure single-particle model. The data exhibit the expected strong systematic variation of QI with the number of particles in the h. subshell which is being filled with 1, 3 and 5 neutrons in 116Sn, 118Sn, and 120Sn, respectively. 相似文献
6.
A. Zemel C. Broude E. Dafni A. Gelberg M.B. Goldberg J. Gerber G.J. Kumbartzki K.-H. Speidel 《Nuclear Physics A》1982,383(1):165-188
Employing the static hyperfine fields at cerium nuclei in magnetized Fe and Gd hosts, the g-factor of the 134Ce(10+) state at backbending (Ex = 3719.3 keV) has been determined as g = ? 0.30 (25). The coexistence of this neutron-dominated state with the ( isomer (Ex = 3208.5 keV, g = ?0.19(1)) is unexpected. A comprehensive spectroscopic study following the 122Sn(16O, 4n) reaction, including γ-angular distributions, prompt and delayed γ coincidence and recoil-distance measurements has yielded new information on quasi-collective bands of both parities. The properties of the low-lying positive-parity states are well described by the interacting boson model. 相似文献
7.
The (1-0), (2-0), and (3-0) transitions of 15N16O and 15N18O are investigated. The wavenumbers of the rotation-vibration lines are reported for the overtone bands and the (1-0) subband. It is shown that in the data reduction it is advantageous to calculate first merged spectroscopic constants ignoring the Λ-type doubling. The vibrational constants ωe, ωexe, ωeye and the vibrational dependence of the rotational constants are determined. The study of 15N18O allows the determination of the equilibrium values of the centrifugal distortion correction ADe to the spin-orbit constant and of the spin-rotation constant γe from the isotopic invariance of the ratios and . It is found that and . 相似文献
8.
R.M. Lieder A. Neskakis M. Müller-Veggian Y. Gono C. Mayer-Böricke S. Beshai K. Fransson C.G. Linden Th. Lindblad 《Nuclear Physics A》1978,299(2):255-284
High-spin states in 195, 197Tl have been populated with (α, xn) reactions and studied by means of in-beam γ-ray and e? spectroscopic methods. Complementary studies of the decay of 195, 197Pb to 195, 197Tl have been carried out. Several new features have been observed in these nuclei. The bands of 195, 197T1. extended to and , respectively, show a quenching of energy spacings between the , , and states. This has been interpreted as resulting from the coupling of a proton to the ( configurations in the core nuclei 194, 196Hg. Furthermore, positive-parity bands based on states were established up to the and states in 195, 197Tl respectively. Probably these bands originate from the coupling of a h proton to a broken neutron pair. This pair consists of a rotation-aligned neutron and a low-j neutron in the , or shell. It is known to constitute the 5? bands in 194, 196Hg. 相似文献
9.
Levels of the N = 81 nucleus 145Gd have been investigated by in-beam γ-ray and conversion electron spectroscopy with the 144Sm(3He, 2n) reaction. Fourteen new low- and medium-spin states between 1.0 and 2.4 MeV excitation, the known yrast levels up to spin , five other high-spin non-yrast states and a new 20.4 ns isomer at 2200.2 keV in 145Gd have been observed. The isomer decays via a fast 927.3 keV E3 transition with B(E3) = 48 ± 7 W.u. Another weaker decay branch is a mixed, strongly hindered E1 + M2 + E3 transition to the state. We propose an octupole main configuration for the isomer, analogous to the 997 keV isomer in 147Gd. The levels of 145Gd are discussed on the basis of the spherical shell model. 相似文献
10.
The hyperfine splitting frequencies gμNBH.F./h of 2.7 h 93Tc , 4.9 h 94Tc (Jπ = 7+) and 20 h 95Tc as dilute impurities in Fe have been measured with NMR on oriented nuclei as 336.36(5) MHz, 175.11(1) MHz and 315.97(2) MHz, respectively. From the resonance shifts with an external magnetic field B0 the hyperfine field of Tc has been determined as -317(5) kG. Taking this into account the nuclear g-factors are deduced as . 相似文献
11.
N. Bräuer A. Goldmann J. Hadijuana M. Von Hartrott K. Nishiyama D. Quitmann D. Riegel W. Zeitz H. Schweickert 《Nuclear Physics A》1973,206(3):452-458
The isomeric levels in 204Po and 206Po have been measured with the stroboscopic method. The results obtained are: . These and other known states in the 208Pb region are compared with theoretical predictions in order to analyze the dependence of the proton g-value on the core constitution. The variation of the g-values is systematically smaller than expected from first-order configuration mixing theory, if pure shell-model wave functions are assumed. 相似文献
12.
Nuclear spectroscopic quadrupole moments of the radioactive isotopes 131Cs, 132Cs, and 136Cs have been determined from the hyperfine structure of the state by the level crossing method. The results including a Sternheimer correction are: , , . The quadrupole moments of all the Cs isotopes from A = 131 to A = 137 are recalculated. It is shown, that nuclear quadrupole moments of a specific isotope obtained from different atomic P-states only agree within the limits of error after application of the Sternheimer correction. The increase of Qs with decreasing neutron number conforms with other observations and theoretical calculations stating that for elements around Z = 55 nuclear deformation develops below N = 82. The staggering of the sign of Qs may be interpreted as consequence of an oblate-prolate degeneracy of the nuclear energy surface. Some magnetic moments have been slightly improved: , (corrected for diamagnetism). 相似文献
13.
D. Ziemińska 《Nuclear Physics A》1975,242(3):461-466
The branching ratios are calculated for 11ΛB decay to the 11C ground and excited states below 8 MeV for two possible spin values of 11ΛB. It is found that the decay rate to the 11C★ state at E★ = 6.48 MeV is comparable in magnitude to that leading to the 11C ground state if is assumed. This result, unlike the branching ratios calculated for the case, is in accord with experiment and lends support to the assumption that holds for 11ΛB. The necessity of the reinterpretation of some of the so-called 13ΛC events in terms of is indicated. 相似文献
14.
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
15.
The magnetic hyperfine splitting νM = |gμNBHF/h| of ; as a dilute impurity in Ni has been measured with nuclear magnetic resonance on oriented nuclei as 226.4(2) MHz. With the known hyperfine field BHF = ?264.4(3.9) kG corrected for hyperfine anomalies the g-factor and magnetic moment of 193mAu are deduced to be |g| = 1.123(17) and |μ| = 6.18(9) μN. 相似文献
16.
C.V.K. Baba D.B. Fossan T. Faestermann F. Feilitzsch P. Kienle C. Signorini 《Physics letters. [Part B]》1973,43(6):483-486
The difference in g-factors for the 61+ and 81+ states in 210Po has been measured as . This result represents a small violation of additivity. A value of g8 = 0.909 ± 0.011, independent of g6, was also obtained. 相似文献
17.
The B3Π(0+) → X1Σ+ band system of Cl2, excited by the recombination of ground state atoms at total pressures near 2 Torr, has been rotationally analyzed in the range 6300–9900 Å. About 30 bands, with 0 ≤ v′ ≤ 6 and 5 ≤ v″ ≤ 14, were investigated, mostly for both 35Cl35Cl and 35Cl37Cl. The band origins and rotational constants for the B state were obtained with the help of the known constants for the ground state. The principal molecular constants (cm?1) for the B3Π(0+) state of 35Cl35Cl are as follows: Te′ = 17 817.67(3); ωe′ = 255.38(3); ωe′xe′ = 4.59(1); ωe′ye′ = ?0.038(8); De′ = 3341.17(14); Be′ = 0.16313(3); αe′ = 2.42(3) × 10?3; γe′ = ?5.7(7) × 10?5. The equilibrium internuclear separation is 2.4311(2) Å. The results of Briggs and Norrish on a transient absorption spectrum of Cl2 assigned as are reinterpreted with the present constants. 相似文献
18.
M. Ionescu-Bujor E.A. Ivanov A. Iordachescu D. Plostinaru G. Pascovici 《Physics letters. [Part B]》1976,64(1):36-38
The quadrupole coupling constant of the 8? 606 keV level of 112In has been measured by the DPAD method in the hexagonal lattice of metallic cadmium. The quadrupole moment of the level is deduced to be |Q| = 0.093(6) in agreement with the theoretical value for the configuration . 相似文献
19.
M.A.J. Mariscotti H. Beuscher W.F. Davidson Y. Gono H.M. Jäger R.M. Lieder M. Müller-Veggian A. Neskakis D.R. Haenni D.R. Zolnowski 《Nuclear Physics A》1978,311(3):395-412
A level scheme of 144Gd has been established using the 144Sm(α, 4nγ) reaction and in-beam spectroscopy methods. Excitation functions, γ-ray angular distributions, γ-γ coincidence spectra, γ-spectra time related to the cyclotron beam bursts and conversion coefficients for the delayed transitions have been measured.The level scheme comprises 11 levels with spins up to I = 12. Two isomers, a 13 ± 2 ns, 7? state at 2471.4 keV and a 145 ± 30 ns, 10+ state at 3433.0 keV have been observed. The former has similar excitation energy as the 7? isomers in 142Sm, 140Nd and 138Ce and it may arise from the configuration although its lifetime seems to indicate some degree of collectivity. The 10+ state has a similar excitation energy as the 10+ isomer found in 138Ce and it may arise from the dominant configuration. Below the 10+ isomer in 144Gd only two excited states have positive parity; the hitherto known first 2+ and 4+ states. The 11+ and 12+ states must include four-particle configurations or they have to be of collective nature. The latter possibility is supported by the considerable E2/M1 mixture (≈ 20 %) observed for the 11+ to 10+ transition. An analysis of the systematics of ground band levels in the N = 80 isotones shows the same gradual behavior between the two VMI solutions previously found for the Te isotopes. 相似文献
20.