Search results for "nuclear fusion"
showing 10 items of 437 documents
The two particle-phonon multiplet ?h 11/2 ?f 7/2 � 3? and higher-lying four-nucleon yrast states in the doubly-odd nucleus 146 63 Eu83
1988
From in-beamγ-ray measurements we have established the high-spin states in146Eu up to 3.5 MeV excitation andIπ=(15+). The highest levels observed are formed by alignment of four nucleons, involving excitation of the144Sm core. Negative-parity states at about 2 MeV are classified asπh11/2νf7/2 × 3− octupole excitations. Quantitative analyses for the octupole multiplet members and for theν=4 states based on empirical data from neighbouring nuclei are presented.
Low-energy rotational bands in the nucleus155Eu
1984
Excited states in the nucleus155Eu have been produced during in-beam bombardments of a154Sm target with3He beams at 22 and 27 MeV. Decay gamma rays were detected using coincidence equipment optimized for low-energy photons. The level scheme is based on the observedγγ-coincidence relationships combined with the information on relative intensities. Tentatively suggested spin assignments follow from the apparent rotational character of the nucleus. Experimental observations are compared with predictions calculated from a particle-rotor model with a nonspheroidal Woods-Saxon potential.
Die zirkulare Polarisation der inneren Bremsstrahlung beim K-Einfang von A37
1958
The circular polarization of the internal bremsstrahlung was measured for various photon energies by scattering on magnetized iron. In the spectral range investigated, complete polarization was found within the measuring error. An average value of P/sub c/ = +1.03 plus or minus 0.04 was obtained. This shows that the maximum parity violation occurs also in K-capture. (tr-auth)
The angular distribution of the 12C(γ,pn) reaction for Eγ=120−150 MeV
1998
The angular distribution of nucleons emitted in the 12C(γ,pn) reaction has been measured using tagged photons at the Mainz microtron MAMI. The variation of the reaction strength with the polar angles of the two emitted nucleons is reported for Eγ=120−150 MeV. The proton angular distribution peaks at more backward angles than the 2H(γ,p) differential cross section indicating a departure from the simple quasi-deuteron model of 2N photo-emission. The distribution shape is in reasonable agreement with microscopic theoretical models which include both π- and ρ-exchange.
Messung der zirkularen Polarisation der inneren und �u�eren Bremsstrahlung
1961
The polarisation of the internal bremsstrahlung γ's was detected by the Compton-forward-scattering with polarised electrons for three differentβ-decays: 1. for the allowed transition (P32), 2. for the unique forbidden transition (Sr90+Y90), and 3. for the forbidden transition with forbidden spectrum (Bi210=RaE). The detected polarisation values of P32 and (Sr90+Y90) agree with the theoretical values for the allowed transitions. The detected polarisation values for Bi210 are smaller than the theoretical values of the allowedβ-transition by a factor of 0.62±0.08.
Few-neutron removal from238U at relativistic energies
1995
As part of a comprehensive study of uranium fragmentation at relativistic energies at the GSI projectile fragment separator, FRS, inclusive neutron-removal cross sections have been measured for severalxn channels at projectile energies of 600 and 950A MeV using targets of Al, Cu and Pb. The variation of the experimental cross sections with target nuclear charge is used to disentangle nuclear and electromagnetic contributions. The electromagnetic cross sections agree surprisingly well with a simple harmonic oscillator calculation of giant dipole resonances based on measured photonuclear cross sections and do not require an extra enhancement of the two-phonon giant dipole excitation as conclu…
The binding energy of 184 476 X in the droplet model
1985
The positron spectrum emitted in the U-U-reaction at subthreshold energy could be interpreted in terms of the formation of a giant nucleus if the binding of the latter is 100 MeV stronger than predicted by the usual droplet model parametrisation. We analyse the extrapolation to giant nuclei by accounting properly for the error propagation when the parameters are fitted to measured binding energies and radii. The influence of higher order terms is discussed.
First observation of gamma-rays from the proton emitter 171Au
2003
Gamma-rays from the alpha- and proton-unstable nuclide 171Au have been observed for the first time. The gamma-rays were correlated with both a proton- and an alpha-particle decay branch, confirming that the nucleus decays by alpha and proton emission from a single (11/2-) state. The measurement confirms the previously determined half-lives for these particle decays but the present values are of higher precision. In addition, a longer half-life than determined in previous work was measured for the proton-unstable tentative ground state. The results are discussed in relation to structures in neighbouring nuclei and compared with a Strutinsky-type TRS calculation.
Evidence for rotational bands in103Nb
1984
The nucleus103Nb62 has been studied through the s− decay of the fission product103Zr at LOHENGRIN and JOSEF. The energies of the lowlying levels and the γ transitions indicate rotational bands based on the Nilsson proton configurations [422 5/2+] [303 5/2−] and [301 3/2−] at 0, 164 and 248 keV, respectively. The measured half-lives of (4.7±0.5) ns and (2.0±0.6) ns of the levels at 164 and 248 keV are consistent with the Nilsson-model estimates including pairing.
Masses of neutron-rich Ni and Cu isotopes and the shell closure at Z = 28 , N = 40
2007
The Penning trap mass spectrometer JYFLTRAP, coupled to the Ion Guide Isotope Separator On-Line (IGISOL) facility at Jyvaskyla, was employed to measure the atomic masses of neutron-rich 70-73Ni and 73, 75Cu isotopes with a typical accuracy less than 5keV. The mass of 73Ni was measured for the first time. Comparisons with the previous data are discussed. Two-neutron separation energies show a weak subshell closure at 68 28Ni40 . A well established proton shell gap is observed at Z = 28 .