80m Br/ 80 Br – A New Electron-Gamma PAC Probe

Applied Radiation and Isotopes, 1994

The decay of 82Br has been investigated through gamma-ray and conversion electron measurements. A level at 2172 keV in 82Kr has been proposed to place the newly observed gamma-rays of 215 and 1395 keV. The presence of gamma-rays of energies 280, 470, 599 and 932 keV has been confirmed. The K conversion coefficients for 8 transitions and (L + M + .) conversion coefficients for 4 transitions are reported. The gy-directional correlation measurements have been used to determine the mixing ratio of 10 transitions, of which the multipolarities for 221 and 273keV transitions have been deduced.

Il Nuovo Cimento A, 1992

The conversion coefficients ~r and ~K the 48.85keV M3 isomeric transition in the decay of S°mBr were measured to be 297.8 + 10.6 and 209.9 + 21.2, respectively employing a low-energy high-resolution photon detector. These results are in agreement with the theory and the experimental values due to the earlier authors.

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2011

The photo-neutron cross-sections of 208Pb and 209Bi induced by 50–70 MeV bremsstrahlung have been measured by using the off-line γ-ray spectrometric technique in the electron linac at the Pohang Accelerator Laboratory. The experimental 208Pb(γ,xn) and the 209Bi(γ,xn) reactions cross-sections at the bremsstrahlung energy region of 50–70 MeV, which are determined for the first time, are in general good agreement with the theoretical values based on the TALYS 1.0 code. We observed that the photo-neutron cross-sections for the (γ,xn) reactions of 209Bi and 208Pb increase with increasing of bremsstrahlung energy from 50 to 70 MeV, which indicates the role of excitation energy. It was also observed that the (γ,xn) reaction cross-sections of the doubly magic shell nuclei 82Pb126 are always higher than those of the singly magic shell nuclei 83Bi126 in the bremsstrahlung energy of 50–70 MeV. This may be due to the fact that either the shell effect are washed out at the higher excitation energy or due to the lower fission cross-section of 208Pb compared to that of 209Bi. This observation indicates that there is a competition reaction between fission and neutron emission.

2011

Photo-neutron cross-sections 208 Pb(c,xn) and 209 Bi(c,xn) reactions Off-line c-ray spectrometric technique a b s t r a c t The photo-neutron cross-sections of 208 Pb and 209 Bi induced by 50-70 MeV bremsstrahlung have been measured by using the off-line c-ray spectrometric technique in the electron linac at the Pohang Accelerator Laboratory. The experimental 208 Pb(c,xn) and the 209 Bi(c,xn) reactions cross-sections at the bremsstrahlung energy region of 50-70 MeV, which are determined for the first time, are in general good agreement with the theoretical values based on the TALYS 1.0 code. We observed that the photo-neutron cross-sections for the (c,xn) reactions of 209 Bi and 208 Pb increase with increasing of bremsstrahlung energy from 50 to 70 MeV, which indicates the role of excitation energy. It was also observed that the (c,xn) reaction cross-sections of the doubly magic shell nuclei 82 Pb 126 are always higher than those of the singly magic shell nuclei 83 Bi 126 in the bremsstrahlung energy of 50-70 MeV. This may be due to the fact that either the shell effect are washed out at the higher excitation energy or due to the lower fission cross-section of 208 Pb compared to that of 209 Bi. This observation indicates that there is a competition reaction between fission and neutron emission.

Nuclear Physics A, 2013

The photo-neutron cross-sections of 93 Nb at the end-point bremsstrahlung energies of 12, 14 and 16 MeV as well as 45, 50, 55, 60 and 70 MeV have been determined by the activation and the off-line γ-ray spectrometric techniques using the 20 MeV electron linac (ELBE) at Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany, and 100 MeV electron linac at Pohang Accelerator Laboratory (PAL), Pohang, Korea. The 93 Nb(γ , xn, x = 1-4) reaction cross-sections as a function of photon energy were also calculated using computer code TALYS 1.4. The flux-weighted average values were obtained from the experimental and the theoretical (TALYS) values based on mono-energetic photons. The experimental values of present work are in good agreement with the flux-weighted theoretical values of TALYS 1.4 but are slightly higher than the flux-weighted experimental data of mono-energetic photons. It was also found that the theoretical and the experimental values of present work and literature data for the 93 Nb(γ , xn) reaction cross-sections increase from the threshold values to a certain energy, where other reaction channels

Nuclear Physics A, 1994

e g-%cton of the 217, 523 and 761 keV levels in 79Br have been measured using Cou cnib excitation of 79Br beams are the transient field technique with Gd as ferromagnetic host, Lifetimes of several state:. have been determined using the Doppler-shift attet%Uatioil method. Mixing ratios of y-u aasiYions were deduced from measured angular carriQlatiotts. The data are discussed in the framework of the weak particle-core coupling and the petifcle-axial-rotor coupling models.

Hyperfine Interactions, 1977

Nuclear orientation measurements are used to determine the hyperfine hamiltonian for 82Br implanted into Fe single crystals (dose 5 X 1014/cm -2 implant energy 80 keV). Using a model based upon channeling measurements a good fit to the temperature-dependent gamma anisotropy is obtained for a pure magnetic interaction experienced by the 36 • 5% of Br which implants substitutionally of magnitude Bhf (substitutional) = 840 _+ 120 kG, with Bhf (non-substitutional) <150 kG. This hamiltonian is used to deduce unknown multipole mixing ratios in the daughter 82Kr decay. Hyperfine field systematics are shown to indicate a substitutional FeBr field of ~ 1000 kG, and the origins of this field and the smaller interstitial interaction are discussed.

Nuclear Physics A, 1977

255-264;©NartJé-FaJlaed Px6ädYGry Co., dnrrtddaÑ oe to be re°sedsroed b7 pLotoprlnt a müaeBha wltLoat wrlrtm pasmistlem ânm tLe pablisLer LEVEL STRUCTURE OF a~Rb STUDIED WITH TIC~Br(ot, 30) BEACTION t M. HEHAR, A. FILEVICH, Ci. C3ARCIA BERMÛDI3Z tt and M. A. J. MARI3COTTI DePaTtanMnto de Fl~laa, ComLrl6n Nadonal da~5reryla AtQnriea, B+renos Abat, Arpentera . Abstraet: States of°Rb wen excited through the ''Hr(a, 3n) reaction at bombarding between 30 and SS MeV. Excüetion flmetiona, y-ray angular distributions, yy coincidences and y-time distributions with respect to the beam bursts wen determined. Levels with the following exc3tetion energies (ia keV) and spin-panty velues sn proposed: 173.6 2, 334.9

European Physical Journal A, 1979

77Br has been investigated by the reaction64Ni(16O,p2nγ) at 60 MeV. The following mean lives (in parentheses) have been determined by the recoil distance Doppler shift method (energies in keV): 161.9 (718±50 ps), 575.2 (14.2±2.1 ps), 639.0 (14.1±0.8 ps), 782.0 (4.3±0.9 ps), 790.1 (6.2±0.8 ps), 1,273.2 (4.0±1.0 ps), 1,303.0 (4.0±1 ps), 1,480.8 (0.6 ±0.2 ps). The resultingB(E2) values are compared with rotor plus particle calculations. Nuclear reaction64Ni(16O,p2nγ)E 0=60 MeV; measuredE γ, recoil distance Doppler shift; deducedT 1/2. Enriched target, Ge(Li).

Physics Letters B, 2019

The proton-rich isotope 68 Br was discovered in secondary fragmentation reactions of fast radioactive beams. Proton-rich secondary beams of 70,71,72 Kr and 70 Br, produced at the RIKEN Nishina Center and identified by the BigRIPS fragment separator, impinged on a secondary 9 Be target. Unambiguous particle identification behind the secondary target was achieved with the ZeroDegree spectrometer. Based on the expected direct production cross sections from neighboring isotopes, the lifetime of the ground or long-lived isomeric state of 68 Br was estimated. The results suggest that secondary fragmentation reactions, where relatively few nucleons are removed from the projectile, offer an alternative way to search for new isotopes, as these reactions populate preferentially low-lying states.