共查询到20条相似文献,搜索用时 15 毫秒
1.
L. L. Litvinsky 《Zeitschrift für Physik A Hadrons and Nuclei》1994,349(2):147-153
A combined analysis of the available data on the primaryγ-ray intensities from the113Cd(n, γ) reaction atE n=1.9 and 24.3 keV neutron energies together with the data on113Cd neutron capture cross sections in theE n=3–200 keV energy region was carried out. The neutron strength functions were determined asS n0=(0.260±0.073) 10?4 and Sn1=(5.06±0.67) 10?4. No spin-orbit splitting of thep-wave neutron strength function was found. The energy dependence of theE 1 radiative strength function {ie147-01} was fitted by the Kadmenski-Furman model somewhat better than by a standard Lorentzian. TheM 1 giant resonance parameters were obtained as E G M 1 =8.8±1.6 MeV and Γ G M 1 = 4.7±2.6 MeV. The neutron capture cross section of113Cd from its isomeric state ({ie147-02}=11/2?, E 1 m =263.7 keV) was calculated. 相似文献
2.
Physics of Atomic Nuclei - The spectrum, angular distribution, and linear polarization of gamma rays from the (n, n′γ) reaction on 166Er were measured in a beam of reactor fast neutrons.... 相似文献
3.
We calculate the Coulomb dissociation of 15C on a Pb target at 68 MeV/u incident beam energy within the fully quantum mechanical distorted wave Born approximation formalism of breakup reactions. The capture cross-section and the subsequently rate of the 14C(n, γ) 15C reaction are calculated from the photodisintegration of 15C, using the principle of detailed balance. Our theoretical model is free from the uncertainties associated with the multipole strength distributions of the projectile. 相似文献
4.
《Nuclear Physics A》1986,455(2):231-293
The nucleus 178Hf was studied through thermal neutron and averaged resonance neutron capture reactions. The γ-ray and conversion electrons were measured with high resolution spectrometers. A level scheme up to an excitation energy of ∼2.1 MeV was constructed. It includes ∼65 levels, most of which are ordered into 18 rotational bands. The level scheme is complete up to about 1800keV for spins between 2 and 5. The neutron binding energy was established to be at 7626.3 (3) keV. The consistent Q form of the IBA-1 (CQF) was used to describe the low-lying collective γ and Kπ = 0+ bands. The agreement with the data was found to be excellent for the energies and B(E2) ratios of the ground and γ bands, whereas the agreement was poor for the Kπ = 0+ bands. 相似文献
5.
M. R. Beitins S. T. Boneva V. A. Khitrov L. A. Malov Yu. P. Popov P. T. Prokofjev G. L. Rezvaya L. I. Simonova A. M. Sukhovoj E. V. Vasilieva 《Zeitschrift für Physik A Hadrons and Nuclei》1992,341(2):155-170
A singles-ray spectrum and a spectrum of summed amplitudes of coinciding pulses (SACP) were measured in the186W(n, )187W reaction experiment on the thermal neutron beam. It was for the first time that the data on187W-transitions were obtained in the excitation energy region from 1500–2500 keV. The neutron binding energy was determined to beB
n=5467.25 (4) keV (statistical error only). In result the level scheme of187W was developed in the excitation energy interval 1E
f
< 3.4=" mev,=" which=" contained=" 105=" levels=" with=" about=" 70=" of=" them=" being=" identified=" for=" the=" first=" time.=" the=" experimental=" values=" for=" summed=" intensities=" of=" two-step=" cascades=" were=" established=" to=" exceed=" those=" predicted=" by=" the=" modern=" statistical=" theory=" (by=" 36±6%).=" this=" is=" explained=" by=" a=" considerable=" contribution=" of=" few-quasiparticle=" components=" to=" wave=" functions=" of=" compound=" and=" intermediate="> 相似文献
6.
Y. Kuno J. Imazato K. Nishiyama K. Nagamine T. Yamazaki T. Minamisono 《Hyperfine Interactions》1984,19(1-4):907-914
The average polarization Pav of the recoil nucleus12B (ground state) produced by the polarized-muon capture reaction12C(–,v
)12B was measured by a new approach which involved the muon spin resonance, and the adoption of Grafoil as a carbon target where the polarization of12 B can be preserved completely under 3 kG holding field. Our observed resultP
av=0.473±0.053 yields gp/gA=9.6
–2.7
2.4
which seems to be consistent with the canonical PCAC prediction within the error.The authors would like to express their sincere thanks to the members of the Meson Science Laboratory and of the Van de Graaff Accerelator at Osaka University. They also acknowledge helpful discussions and suggestions given by Professors M. Morita, H. Ohtsubo and K. Kubodera. This work is supported by the Grant-in-Aid of the Ministry of Education, Science and Culture. 相似文献
7.
Energies and intensities of the gamma-ray transitions following the thermal neutron capture in130Te are determined. The neutron separation energy for131Te is evaluated to be 5929.4 ±±0.3 keV. A statistically significant correlation between the reduced transition intensities and the spectroscopic factors from the (d, p) reactions is found. Evidence for the presence of potential capture mechanism is given.On leave fromAl-Faateh University, Physics Department, P.O. Box 13371, Tripoli, Libya. 相似文献
8.
9.
An irradiation of 238U with a beam of reactor fast neutrons permits revealing about 550 gamma transitions associated with the respective (n, n′γ) reaction and with fission fragments. The use of all known data on gamma radiation from fission fragments makes it possible to identify gamma transitions belonging to 238U with a high probability. The scheme of levels and gamma transitions is composed for 238U. New levels (including those of spin-parity J π = 0+) at excitation energies below 2 MeV are proposed. The low-lying levels in the rotational band for two-phonon octupole excitations are determined. It is found that a hybrid state is formed upon the crossing of this band and the band based on two-quasiparticle excitations. This hybrid state must involve excitations of both types. A small value of the rotational-band parameter in the isomer of energy 2559.0(4) keV is explained by the contribution to this state from two-quasiparticle configurations belonging to the 1k 17/2 subshell. The same circumstance may also be responsible for an enhanced yield of ternary fission for this isomer. 相似文献
10.
P. Corvisiero M. Anghinolfi L. Z. Dzhilavyan G. Gervino G. Ricco M. Ripani M. Sanzone M. Taiuti A. Zucchiatti 《Few-Body Systems》1991,10(4):135-141
The2H(d, )4He differential cross section was measured at deuteron laboratory energies of 20, 24, and 28 MeV between cm=45° and cm=135°. AtE
d
=28 MeV a complete angular distribution was determined and fitted with Legendre polynomials. The ratioR=d/d (cm=90°)/d/d (cm=135°) was measured for each deuteron energy. 相似文献
11.
12.
The possibility of separating, with the aid of photoemulsion, channels of the reaction 12C(γ, n 3He)2α that involve the formation of 7Be and 8Be intermediate nuclei in excited states is studied. The experimental energy distributions of these nuclei are obtained. The relative yields from these reaction channels are estimated. 相似文献
13.
M. S. Onegin M. S. Yudkevich 《Bulletin of the Russian Academy of Sciences: Physics》2012,76(10):1081-1084
We calculate the yield of 176m Lu isomer in dependence on neutron energy using the Huizenga-Vandenbosch and Hauser-Feshbach statistical models. The results are compared to experimental data. We discuss the impact of uncertainty in calculating the isomer yield on the isotopic ratio 176Lu/175Lu in the core of the Oklo reactor. 相似文献
14.
The astrophysical S-factor of the4He+12C radiative capture is calculated in the potential model at the energy range 0.1-2.0 MeV.Radiative capture12C(α,γ)16O is extremely relevant for the fate of massive stars and determines if the remnant of a supernova explosion becomes a black hole or a neutron star.Because this reaction occurs at low energies,the experimental measurements are very difficult and perhaps impossible.In this paper,radiative capture of the12C(α,γ)16O reaction at very low energies is taken as a case study.In comparison with other theoretical methods and available experimental data,good agreement is achieved for the astrophysical S-factor of this process. 相似文献
15.
LI ZhiHong SU Jun GUO Bing LI ZhiChang BAI XiXiang LIU JianCheng LI YunJu YAN ShengQuan WANG BaoXiang WANG YouBao LIAN Gang ZENG Sheng LI ErTao CHEN YongShou SHU NengChuan FAN QiWen & LIU WeiPing China Institute of Atomic Energy Beijing China 《中国科学:物理学 力学 天文学(英文版)》2010,(4)
The angular distribution of the 12C(7Li,6He)13N reaction at E(7Li) = 44.0 MeV was measured at the HI-13 tandem accelerator of Beijing, China. The asymptotic normalization coefficient (ANC) of 13N → 12C + p was derived to be (1.64 ± 0.11) fm-1/2 through the distorted wave Born approximation (DWBA) analysis. The ANC was then used to deduce the astrophysical S (E) factors and reaction rates for the 12C(p,γ)13N direct capture reaction at energies of astrophysical relevance. 相似文献
16.
Levels of138Ce and140Nd have been studied using the138Ba(α,4nγ)138Ce and140Ce(α, 4nγ)140Nd reactions. Singleγ-ray spectra,γ-γ coincidence spectra, angular and time distributions with respect to the beam bursts have been measured. A number of higher excited states with excitation energies up to about 5 MeV and with spin value up to 12 are populated in both nuclei. The lower states with spins and parities 7?, 5?, 6? and 10+ can be explained by two-quasiparticle neutron configurations of the types (h 11/2 ?1 ,d 3/2 ?1 ) 7? , (h 11/2 ?1 ,S 1/2 ?1 ) 5?, 6? and (h 11/2 ?2 ) 10+. Several high-spin states observed in138Ce and140Nd can be explained qualitatively as four-quasiparticle states with two-proton-two-neutron configurations. The 3? state at an energy of 2,137.4 keV is observed in138Ce. The evidence for the existence of the low-lying 3? states in140Nd at 2,124.0 keV is discussed. Beside the known 9.6 ms (7?) isomeric state in138Ce another state at 3,538.5keV (10+) with a half life of about 200 ns has been observed. The observed levels in the138Ce and140Nd nuclei are compared with theoretical predictions using delta force interaction. 相似文献
17.
Varlachev V. A. Dudkin G. N. Nechaev B. A. Pen’kov F. M. Filipowicz M. Philippov A. V. Flusova D. S. Chumakov D. K. Shuvalov E. N. 《JETP Letters》2021,113(4):231-237
JETP Letters - The T(1H, γ)4He reaction has been studied for the first time in the energy range Elab = 12–34 keV in the laboratory coordinate system (E = 7.8–20.1 keV in the... 相似文献
18.
《Nuclear Physics A》1987,475(2):207-218
The 64Zn(p, γ)65Ga reaction has been studied in the proton energy ranges Ep = 2.0–2.9 and 3.3–4.3 MeV. Using a three-crystal pair spectrometer, gamma-ray spectra of primary transitions were measured throughout this proton energy interval in steps of about 20 keV. An average gamma ray spectrum for each energy region was formed by adding all the relevant individual spectra after adjustment due to the change of the proton energy. In the excitation energy range 0.0–3.7 MeV 50 levels, of which 20 are new, were observed. The gamma strength function was deduced from the average intensities of the primary gamma-rays. The absolute value of the strength function was found to be 5–10 times smaller than that expected from the extrapolation of the lorentzian shape of the El giant resonance. 相似文献
19.
The125Te(n, )126Te reaction has been studied with thermal neutrons. Totally 113 lines in the -ray spectrum were assigned to radiative transitions in the126Te isotope. The neutron separation energy of126Te was evaluated to be 9113.8±0.1 keV. The experimental values of the partial cross sections of the primary E1-transitions were compared with predictions of the Lane-Lynn theory. 相似文献
20.
《Nuclear Physics A》1987,462(4):605-620
We have measured the angular and momentum distributions of the scattered pions from the reaction 12C(π+, π+p)11B and 6Li(π+, π+ p)5He in a coincidence experiment. We compare our results with the plane and distorted wave impulse approximations. 相似文献