共查询到20条相似文献,搜索用时 203 毫秒
1.
Angular distributions of vector analyzing power have been measured for the reaction at a beam energy of 10 MeV. The observed j-dependence of vector analyzing power allows unambiguous spin assignments to be made for the following states in 63Ni (excitation energies in MeV): ; ; ; ; ; ; ; ; ; ; ; . An assignment of is suggested for the state at 2.519 MeV. The data for the unresolved ln = 4, 1 doublet (1.294, 1.327) MeV indicate the spin assignment for the 1.327 MeV state. The main features for all the data are in agreement with DWBA calculations. 相似文献
2.
New uv absorption spectra have been observed for SiBr. Five Rydberg states are identified to the states , , , , and by comparison with SiF and SiCl. The ionization potentials of SiCl and SiBr have been determined for the first time, and were 6.82 and 6.67 eV, respectively. 相似文献
3.
4.
C.P. Bust J.R. Carter W.W. Neale J.G. Rushbrooke D.R. Ward R.E. Ansorge B.Y. Oh M. Pratap G. Sionakides G.A. Smith J. Whitmore R. Raja L. Voyvodic 《Nuclear Physics B》1978,140(3):409-422
We have investigated the reactions . The final state is dominated by diffractive production of a system which shows a strong tendency to form . The process is also observed in this reaction, indicating an energy dependence of s?1.5±0.1. The channel shows less single diffraction, and has a doubly diffractive component consistent with pomeron factorization. Strong Δ++(Δ++) production is agoain seen, but in contrast to the channel we also observe considerable ?0 production. 相似文献
5.
T. Minamisono J.W. Hugg D.G. Mavis T.K. Saylor H.F. Glavish S.S. Hanna 《Physics letters. [Part B]》1976,61(2):155-157
Polarized β-emitting , nuclei were produced in the reaction in thick polycrystalline targets of KBr, KCaBr3, and KCaI3 which served as hosts for the nuclei. The net polarization transferred to the nuclei was detected by measuring the asymmetry in the β-decay. The magnetic dipole moment of was measured by NMR detection. Including a diamagnetic correction we obtain ω=1.0216(2) nm. 相似文献
6.
Harry Partridge Charles W. Bauschlicher James R. Stallcop 《Journal of Quantitative Spectroscopy & Radiative Transfer》1985,33(6):653-655
Potential energy curves for the , and states of N+2 that dissociate to N () and , have been determined from a complete active space self-consistent field calculation. The state is found to be significantly bound (De = 2.68 eV) with a minimum at 1.72 Å. 相似文献
7.
G.T.A. Squier W.E. Burcham S.D. Hoath J.M. Freeman P.H. Barker R.J. Petty 《Physics letters. [Part B]》1976,65(2):122-124
The reaction threshold has been measured as 8007.7 ± 1.8 keV, equivalent to an energy release of 6030.6 ± 1.8 keV in the beta decay. The half-life has been measured as 422.28 + 0.23 ms. The corresponding ft value is reasonably consistent with those of other superallowed Fermi decays. 相似文献
8.
L.K. Fifield T.J.M. Symons C.H. Zimmerman M.J. Hurst F. Watt K.W. Allen 《Physics letters. [Part B]》1977,68(2):125-128
Levels at 7.17, 8.29, 8.96 and 9.88 MeV in 19F have been assigned spin and parity , , and , respectively, from resonance strength and γ-ray angular distribution measurements employing the 15N(α,γ) 19F reaction. An earlier assignment of to the 8.96 MeV level is incorrect. The measured properties of the states are compared with the results of both SU (3) shell model and cluster model calculations. 相似文献
9.
The high-dispersion absorption spectrum of the CuH molecule has been photographed in the ~2500- to 1750-Å region. Observations include the previously reported and transitions and four new transitions which occur between 2100 and 1890 Å: , , , and . The state has been characterized through v = 2 while the new observations on include v = 11 through 16. The F, H, and I states are characterized through v = 1. All of the upper states exhibit perturbations. In addition the H 1± and I 1± states show signs of predissociation. 相似文献
10.
P. Allen H. Grässler D. Lanske R. Schulte K. Böckmann C. Geich-Gimbel B. Nellen H. Saarikko P. Bosetti V.T. Cocconi A. Grant P.O. Hulth H. Klein D.R.O. Morrison Ch. Peyrou P. Schmid K. Sliwa B. Saitta 《Physics letters. [Part B]》1982,112(1):88-92
Charge properties of the hadronic systems from νp and scattering in BEBC are studied in the framework of the quark-parto model (QPM). The average charges and of a quark jet and a d-qua jet, respectively, are determined according to two different methods. The difference is in agreement with e QPM value of 1. Scaling of charge and energy flow in the angular variable λ is demonstrated. The ratios of charge flows in νp a scattering are in accord with the QPM in both hemispheres. 相似文献
11.
Compound nucleus states in and have been investigated with the and three-particle reactions. The observed states (EX≈20 MeV) can be understood, in analogy to the ground states of the A=5 system, by coupling a nucleon to the first 0+ excited state of . 相似文献
12.
The three-body final states and produced from πp interactions at 1.69 GeV/c are examined. The quasi-two-body state Λ(1405)K0 is discussed in detail. In particular, the spin of Λ(1405) is determined, via the method of Byers and Fenster, to be consistent with . The Σ±π? mass spectrum is compared to that produced by various zero-range and effective-range parametrizations and the Λ(1405) is found to have a mass of 1405 MeV and width of 45–55 MeV. Production and decay characteristics of the quasi-two-body states are reported. 相似文献
13.
M.A. Jabiol D. Denegri C. Louedec F. Grard C. Poiret R. Windmolders M.I. Bogoljubsky A.M. Moiseev E.H. Starchenko E. De Wolf M. Barth M. Van Immerseel K.G. Zaitsev E.S. Lukin A.S. Proskurjakov L.N. Smirnova 《Nuclear Physics B》1981,183(3):330-348
The cross sections of several exclusive reactions in interactions are given. In the channels which dominate the interactions, the single and double diffractive dissociations are analysed and compared to the results obtained with K±p interactions at the same energy, pp and interactions at other energies. The test of factorization at the p → pπ+π? vertex is well verified. The process is studied and the cross sections of production are also given. 相似文献
14.
Sugimitsu Tsuyoshi 《Nuclear Physics A》1974,224(1):199-220
Excitation functions of γ-rays from the 75As(p, n)75Se reaction were measured with 2.0 to 3.6 MeV protons to establish the level scheme of 75Se up to about 1.5 MeV excitation energy. Internal conversion electrons following the same reaction were measured at 4.5 and 5.0 MeV proton energy. Using theoretical predictions of the statistical compound nucleus model together with deduced internal conversion coefficients, unique spin assignments were obtained for the and levels. Probable spins were proposed to the for one of the doublet and or for the other), 579.4 or , or and or levels. Alow-lying level was tentatively assigned at 133.2 keV energy. It was found that a low-lying level which appears systematically in other odd Se nuclei is absent in 75Se. 相似文献
15.
16.
B. Jongejans R. Blokzijl J.C. Kluyver G.G.G. Massaro H. Voorthuis M. Cerrada Ph. Gavillet R.J. Hemingway M.J. Losty J.J. Engelen W.J. Metzger C.L.A. Pols B. Foster L. McDowell J. Wells 《Nuclear Physics B》1978,139(4):383-393
A 2.5 standard deviation signal is observed for the decay . From this signal a partial width of 13.0 ± 5.0 MeV for the decay mode is deduced under the assumption that the ππ system is in an I = 1 state. For the rare decay mode no signal is observed. The following upper limits can be given for the decay widths: , , . 相似文献
17.
Comparisons of exact finite-range (EFR) DWBA calculations and zero-range (ZR) calculations are presented for the cross sections and analysing powers of the reaction to the ground state (), states. The data for the states are quite well fitted and show the characteristic j-dependence of the analysing powers. Only small differences between the EFR and ZR calculations are seen. The analysing power data for the state are poorly fitted by the EFR or ZR calculations but better agreement is obtained when the coupling to other levels is included in a coupled channel Born approximation (CCBA) calculation. 相似文献
18.
We calculate the production of narrow resonances with even charge conjugation in e+e? annihilation in the quarkonium and vectordominance models. We give unitarity bounds for in terms of and . The electromagnetic production dominates through the neutral current at low energies independent of details of the model. For masses above 10 GeV the situation is reversed. 相似文献
19.
We consider the possibility that the scalar partners of the neutrinos are the least massive supersymmetric partners, and show that this alternative is compatible with cosmological constraints, which put a significant lower bound on photino masses but not on masses. Various consequences are examined: the photon counting rate for may be large; the rate for by exchange is enhaced; Z0→ increases Γ(Z0) by about 0.25 GeV; may be enhanced; the decay may be detectable; there can be additional contributions to the rare decay ; restrictions on gluino masses, which depend on photinos interacting before they decay, have to be re-examined; scalar neutrinos have suitable characteristics as candidates for dark matter in the universe. We discuss one currently fashionable class of models that can predicr a light . 相似文献
20.
J.D. Petke Gerald M. Maggiora Lester L. Shipman Ralph E. Christoffersen 《Journal of Molecular Spectroscopy》1978,73(2):311-331
Ab initio configuration interaction wavefunctions and energies are reported for the ground state and many low-lying singlet and triplet states of magnesium chlorin and chlorin, and are employed in an analysis of the electronic absorption spectra of these systems.In chlorin, the calculated visible spectrum consists of two states, the lower energy, y-polarized state exhibiting moderate absorption intensity in contrast to the very weak absorption of the higher energy x-polarized state. The configurational composition of both states is well described by the four-orbital model. Five states are responsible for the Soret band envelope. A moderately intense y-state lies under the low energy edge of the band envelope, while two x-polarized states of moderate and strong intensity, respectively, are responsible for the band maximum. The final two states lie at the high energy edge of the Soret band and introduce a measure of asymmetry into the band envelope. Two states of very weak oscillator strength are also found in this region of the spectrum. All the Soret states are of complex configurational composition, and several of the higher lying states contain contributions from doubly excited configurations.The calculated visible spectrum of magnesium chlorin also consists of two states, with the weakly absorbing x-polarized state lying approximately 200 cm?1 lower in energy than the moderately intense y-polarized state. The configurational composition of both states is well described by the four-orbital model. Four states constitute the bulk of the intensity in the Soret band envelope. In distinction to chlorin, the moderately intense state at the low energy edge of the band envelope is x-polarized. Two intense states of y- and x-polarization, respectively, constitute the band maximum region, and a single x-polarized state of moderately strong intensity can be assigned to the high energy shoulder of the band envelope. Two other weakly absorbing states are also found in this region, along with another weakly absorbing state of mixed in-plane and out-of-plane polarization. No clearly defined states are observed. As was the case for chlorin, all the Soret states are of complex configurational composition, and some of the higher energy states contain significant contributions from doubly excited configurations.Chlorin and magnesium chlorin both possess three states which lie below S1 and a single which lies slightly above S2. All four of the low-lying states in each molecule are well described by the four-orbital model, with T1 being essentially a single configuration in each case. The remainder of the states are clustered in the same energetic region as the comparable Soret states, with comparably complex configurational compositions.Dipole moments and charge distributions for low-lying singlet and triplet states are also reported, and are used to rationalize chemical reactivity characteristics. 相似文献