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Susumu Ohya 《Nuclear Physics A》1974,235(2):361-377
The energy levels of 97Ru have been studied through the decay of 31.1 min 97gRh and 44.3 min 97mRh using Ge(Li), Si(Li), Nal, plastic and anthracene detectors in singles and in coincidence experiments. A total of 139 γ-rays were observed. Ninety-eight γ-rays have been placed into the decay schemes involving 38 excited levels in 97Ru. The level energy of 97mRh was determined to be 258.6 keV. The spin and parity of 97gRh and 97mRh are assigned as , respectively. The fraction of decay of the isomer by the isomeric transition was measured with the Si(Li) detector, and αk values were determined for strong transitions. The half-life of the 188.6 keV, state in 97Ru was determined as 0.23 ± 0.02 ns by delayed e-γ coincidence measurements. The nuclear structure of low-lying levels is compared with similar levels in other odd-mass nuclei (N = 53) isotones and Ru isotopes). 相似文献
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H.H. Eggenhuisen L.P. Ekström G.A.P. Engelbertink H.J.M. Aarts J.A.J. Hermans 《Nuclear Physics A》1977,285(1):167-188
Yrast levels in 40K and 40Ar have been investigated with the 26Mg(16O, pnγ)40K and 26Mg(16O, 2pγ)40Ar reactions at a beam energy of 34 MeV. Gamma-ray angular distribution and γ-γ coincidence measurements have been performed with a high-resolution large volume Ge(Li)-NaI(Tl) Compton-suppression spectrometer. Gamma-ray linear polarizations have been measured with a three-crystal Ge(Li) Compton polarimeter. The 40K decay scheme involves new high-spin levels at Etx = 4365.6±0.3, 4875.6±0.4 and 6227.0±0.5 keV with lifetime limits of < 1, < 1 and < 2ps, respectively. Unambiguous spin-parity assignments of to the 40K levels at Ex = 0.89, 2.88, 4.37, 4.88 and 6.23 and of levels at Ex = 2.89 and 3.46 MeV, respectively, have been obtained. Branching ratios and multipole mixing ratios are reported. 相似文献
4.
The spin-isospin flip (6Li, 6He) reaction has been studied. The experiment was performed with a 34 MeV 6Li beam incident upon 25, 26Mg and 27Al targets. Angular distributions associated with the lowest states were measured. Microscopic DWBA calculations were performed using Yukawa central and r2. Yukawa (r2 · Y) tensor (μ = 1.0 fm?1) potentials averaged over the 6Li(6He) cluster model wave functions. Knock-on (KO) exchange corrections corresponding to the central interaction are included using the local-energy approximation (LEA) method. The conclusion is that the quasi-elastic process is of major importance in the (6Li, 6He) transition studied in this work. 相似文献
5.
The anisotropies of the 177, 326, and 503 keV γ-transitions between negative parity states of 131Xe have been remeasured in the decay of oriented 131I nuclei. In addition the linear polarization of the 503 keV radiation has been determined with a Compton polarimeter consisting of two Ge(Li) detectors. A combined analysis of the reported experiment and earlier internal conversion and angular distribution data yields the unique assignments for the levels at 341 and 667 keV. The mixing ratios of the 177 and 326 keV transitions are δ(177) = ?4.5 ± 1.5 and δ(326) = ?4.4 ± 1.6. The intensity of the L = 2 component in the first forbidden β-decay to the 667 keV level is at most 60 %. 相似文献
6.
A. Filevich A. Ceballos M.A.J. Mariscotti P. Thieberger E. Der Mateosian 《Nuclear Physics A》1978,295(3):513-524
The 6? and 7? isomeric states in 66Ga and 68Ga at 1440.9 and 1229.6 keV, respectively, have been populated with the (13C, 2np) and (15N, n2p) reactions on natural Fe. The half-lives of these states have been measured to be and . Using previous data on the hyperfine field of Ga in Fe, the g-factors of these states have been determined by means of the TDPAD method. The results are and . These values are in very good agreement with the independent particle model if one assumes the and configurations and uses the empirical proton and neutron g-factors from odd-A neighboring nuclei instead of the Schmidt values. The large disagreements with experiment when Schmidt values are used show that core polarization effects are important in these nuclei. 相似文献
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About ScienceDirect 《Nuclear Physics A》1983,410(3):531-533
High-spin states in 167,168Hf and 170, 171W have been excited by the reactions . The yrast bands have been observed up to in 167Hf, Jπ = 28+ in 168Hf, in 171W and Jπ = 22+ in 170W. Both even-even nuclei display a strong backbend around Jπ = 14+, whereas 167Hf shows an upbend at ω ~- 0.33 MeV and 171W exhibits a progressive gain in aligned angular momentum above ω ~- 0.26 MeV. At even higher rotational frequencies, bridges have been found in the central valleys of the γ-γ correlation matrices at ω ~- 0.42 and 0.52 MeV for the Hf isotopes and ω ~- 0.45 and 0.47 MeV for the W isotopes. Deduced moments of inertia for the Hf isotopes using the correlation data show a smooth increase up to about the rigid-sphere value at ω ~- 0.5 MeV. The data are satisfactorily accounted for by cranked shell-model calculations. In particular, a qualitative interpretation is given for the experimentally observed systematic difference in the strength of the interaction potential for the N = 95 and N = 97 isotopes of Hf and W. 相似文献
9.
M. Langevin C. Détraz D. Guillemaud F. Naulin M. Epherre R. Klapisch S.K.T. Mark M. De Saint Simon C. Thibault F. Touchard 《Nuclear Physics A》1981,366(3):449-460
β-delayed emission of α-particles from 9Li and of both α and 6He particles from 11Li is observed. Singles energy spectra and two-dimensional energy spectra of coincident particles are measured. A time-of-flight versus energy measurement is used to identify the mass of the particle. New β-branches are observed which populate high-energy levels in the daughter nuclei. The branching ratios are measured and the β-delayed neutron emission probabilities are deduced. 相似文献
10.
H.J.M. Aarts G.A.P. Engelbertink H.H. Eggenhuisen L.P. Ekström 《Nuclear Physics A》1979,321(2):515-532
High-spin states of 38Ar have been studied with the 35Cl(α, pγ)38Ar reaction at Eα = 18 MeV and with the 24Mg(16O, 2pγ)38Ar reaction at . The 38Ar level scheme is obtained with the former reaction from a proton-γ coincidence measurement. Gamma-gamma coincidence, γ-ray angular distribution and linear polarization experiments have been performed with a Ge(Li)-Na(Tl) Compton suppression spectrometer and a three-crystal Ge(Li) Compton polarimeter. Unambiguous spin-parity assignments of to the 38Ar levels at Ex = 7.51, 8.08, 8.57, 8.97, 10.17 and 11.61 MeV, respectively, are obtained. The 8.57 MeV, 8+ level has a mean life below 0.8 ps. Excitation energies, branching ratios, multipole mixing ratios and transition strengths are reported. The experimental results are compared with shell-model calculations. 相似文献
11.
Analog (fp)3 states preferentially excited in the and the reactions have been identified in the mass 43 mirror nuclei. A simple zero-range DWBA calculation made with a cluster form factor gives good agreement with the measured angular distributions, but spectroscopic strengths deduced for mirror levels do not agree. The 3p-0h states are excited with a rather uniform cross section not strongly correlated with spins. 相似文献
12.
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
13.
H.H. Eggenhuisen L.P. Ekström G.A.P. Engelbertink H.J.M. Aarts W.G.J. Langeveld 《Nuclear Physics A》1978,299(1):175-188
Yrast states of 41K and 41Ca have been investigated with the 26Mg(18O, p2nγ)41K and 26Mg(18O, 3nγ)41Ca reactions at a beam energy of 34 MeV. Gamma-gamma coincidence, γ-ray angular distribution and linear polarization measurements were performed with a Ge(Li)-NaI(Tl) Compton suppression spectrometer and a three-crystal Ge(Li) Compton polarimeter. Unambiguous spin-parity assignments of , , , , and to the 41K levels at Ex = 1.68, 2.53, 2.76, 2.77, 4.27 and 4.98 MeV and of to the 41Ca levels at Ex = 3.20, 3.37 and 3.83 MeV, respectively, have been obtained. Excitation energies, branching ratios, multipole mixing ratios and transition strengths are reported. The main features of the 41K and 41Ca level and decay schemes are reproduced in a 2p-1h and 3p-2h shell-model calculation. 相似文献
14.
Nuclear magnetic resonance of oriented 71As and 72As nuclei has been observed in an iron host lattice at low temperatures. The resonance frequencies are vl = 174.96(10) MHz and 282.00(11) MHz respectively for zero external field. Using Bh.f.(FeAs) = 342.9(3) kG the g-factors of the two isotopes are derived as . Combining nuclear orientation data with these results the spin of 71As has been confirmed as . The magnetic moments of the and 2? states in the As isotopes are discussed in the framework of the shell model with configuration mixing. 相似文献
15.
H.H. Bingham C.W. Farwell W.B. Fretter G.M. Irwin S. Kahn A. Lu B. Daugeras D. Fournier J. Hennessy M. Novak J.J. Veillet A.M. Cnops F.R. Huson R.I. Louttit D.J. Miller J.S. ONeall M. Di Carato M. Rollier J. Ginestet 《Nuclear Physics B》1973,52(1):31-69
Coherent production of final states from A ~ 20 nuclei by K? beams of 5.5, 10.0 and 12.7 GeV is analyzed. Final states with ? 2πO are included. Coherent production occurs (although forbidden via 0+ exchange) and is dominated by the 1 (890). The shape of the t distribution, the alignment of the produced meson and the ratio of the cross section on nuclei to that on hydrogen are consistent with optical model predictions assuming that 1 (890) are produced on single nucleons by exchange of isoscalar trajectories of natural parity (JP = 1?, 2+, etc.) and that the 1 (890) absorption in nuclear matter equals that of the K?. Coherent production (allowed via 0+, 1?, 2+, etc. exchange) is dominated by the Q phenomenon. A Dalitz plot and angular correlation analysis yields values for fractions, and shows that dominates the coherently produced Q. The helicity of the Q is found to be compatible with 0. The Q? -nucleaon total cross section is estimated to be 0.98?0.37+024 times the ? -nucleon total cross section from a comparison of the coherent Q-production cross section with corresponding hydrogen cross sections at 10 and 12.7 GeV. We observe coherent production of ω. The ration coherently produced in the Q mass region is (4 ± 1)%. Coherent production of is observed in the L region. Coherent production is not observed in the K4π channels. 相似文献
16.
Internal rotation A-E splittings have been observed in the ground state for both 35Cl and 37Cl isotopic species of S-methylchlorothioformate. The values and have been obtained. The anaalysis of the hyperfine structure gave , and , . Only the syn-conformation of the methyl group with respect to the carbonyl group has been observed. A partial r0 structure is given. 相似文献
17.
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
18.
The existence of states which change the number of particles in four and wich are specifically excited in α-transfer reactions like (16O, 12C), (6Li, d), etc. is predicted, as a consequence of the existence of proton and neutron pairing vibrations which are strongly excited in two-particle transfer reactions. In particular a Jπ = 0+ two-phonon σ-vibration (4p?4h) state is expected at ≈ 7 MeV of excitation in 208Pb and with a relative cross section . Similar states are expected in neighbouring nuclei. 相似文献
19.
Electromagnetic studies have established that the ground state doublet in 7Li is well described by the LS coupling shell model, provided quadrupole effective charge is introduced. The results of microscopic calculations for the excitation of the level in inelastic proton scattering shown within indicate that an equivalent renormalization of the 7Li quadrupole neutron transition densities is also necessary. This verifies the assumption which was made in a previous calculation of the cross section for the excitation of the level in the 7Li+24Mg reaction. 相似文献
20.
M.A. Van Driel G.A.P. Engelbertink H.H. Eggenhuisen L.P. Ekström J.A.J. Hermans 《Physics letters. [Part B]》1975,59(4):336-338
Angular correlation measurements with a Compton-suppression spectrometer in combination with polarization measurements with a three-crystal Ge(Li) Compton polarimeter of γ-rays produced in the reaction result in an unambiguous Jπ = 6+ assignment to the 6408.3 ± level. It is exclusive decay to the 5?, 4.59 MeV level is discussed. 相似文献