64Ni Reaction Research Articles

Calculation the Cross Sections for64Cu(n,p)64Ni Reaction By Reciprocity Theory

In this study intermediate elements 64Ni , 64Cu for 64Ni (p,n)64Cu reaction with proton energy from (1.0) MeV to (132) MeV with threshold energy (2.496) MeV are used according to the available data of reaction cross sections. We calculated the cross sections for 64Cu(n,p)64Ni reaction by application in nuclear technology (reciprocity theory). In reciprocity theory we derive the mathematical formula for 64Cu(n,p)64Ni and we deduced high probability to produced 64Ni because it is very important such as it used in technology field .The evaluated cross sections as a functions of neutron energy between (En =0.504MeV) to (En=129.506MeV) of (0.0106barn) (0.254barn) respectively and statistical factor (gp,n=1 and gn,p=1/3) .

Cross-section measurement for the 67Zn(n, $ \alpha$ )64Ni reaction at 6.0 MeV

Up to now, no experimental cross-section data exist for the 67Zn (n, $ \alpha$ ) 64Ni reaction in the MeV neutron energy region. In the present work, the cross-section of the 67Zn (n, $ \alpha$ ) 64Ni reaction was measured at E n = 6.0 MeV. Experiments were performed at the Van de Graaff accelerator of Peking University, China. Fast neutrons were produced through the D (d, n) 3He reaction using a deuterium gas target. Absolute neutron flux was determined by a small 238U fission chamber and a BF3 long counter was used as a neutron flux monitor. A twin gridded ionization chamber was employed as the $ \alpha$ -particle detector and two back-to-back 67Zn samples were used for $ \alpha$ events measurement. Background was measured and subtracted from foreground. The measured cross-section of the 67Zn (n, $ \alpha$ ) 64Ni reaction was 7.3 (1±15%) mb at 6.0MeV. The present result was compared with existing evaluations and TALYS code calculations.

Recent results at HRIBF using neutron-rich radioactive ion beams

Several recent experiments at the Holifield Radioactive Ion Beam Facility using neutron-rich radioactive ion beams (RIBs) are briefly described. These experiments contribute significantly to the growing list of techniques currently used with RIBs. Recent fusion-evaporation cross-section measurements below the Coulomb barrier for the 132Sn + 64Ni reaction suggest enhancement as compared to 124Sn + 64Ni reaction. These studies are being expanded to include reactions with 134Sn. The g factor of the first 2+ state in 132Te has been measured to be 0.35(5) through the recoil-in-vacuum technique. Angular distributions have been measured in the reaction 13C(134Te,135Te)12C at 550 MeV and used to suggest the spin and parity of a new 2109 keV state in 135Te as , suggesting a single-particle configuration of . Decay spectroscopy may be further enhanced using a ranging-out technique to reduce the isobaric impurity of neutron-rich beams.

Production and separation of neutron-rich rare isotopes around and below the Fermi energy

The production of n-rich rare isotopes around and below the Fermi energy is investigated using beams from the K500 Superconducting Cyclotron and the MARS recoil separator at the Cyclotron Institute of Texas A&M University. The experimental results from the reactions of 25 MeV/nucleon 86Kr + 64Ni and 21 MeV/nucleon 124Sn + 124Sn are presented and compared with simulations. The calculations involve a deep inelastic transfer (DIT) code for the primary interaction stage followed by the code GEMINI for the de-excitation stage. The results are also compared with the EPAX parametrization. The data on the 25 MeV/nucleon 86Kr + 64Ni reaction show that both proton-removal and several-neutron pick-up isotopes are produced. An enhancement is observed in the production of n-rich isotopes close to the projectile relative to the predictions of DIT/GEMINI and the expectations of EPAX. The data of 21 MeV/nucleon 124Sn + 124Sn for fragments away from the projectile ( Z=30–20) show also production of very n-rich nuclides, despite the less peripheral character of these collisions. In general, the large cross sections of n-rich nuclides from these reactions around the Fermi energy indicate that they may be exploited to produce beams of very n-rich rare isotopes. The application of such reactions in current plans of rare beam production at Texas A&M using a superconducting solenoid line will be described.

Yrast excitations in A = 126–131 Te nuclei from deep inelastic 130Te+ 64Ni reactions

Thick target γγ coincidence measurements for the system 130Te + 275 MeV 64Ni have been performed using the GASP Ge detector array at Legnaro. For the isotopic assignments of previously unknown γ-ray cascades, prompt γγ coincidences observed between Te and Ni partner products were of vital importance. The results yield much new information about excited states of moderate spins in A = 126–131 tellurium nuclei, especially about yrast excitations of the little studied odd- A isotopes 127Te, 129Te, and 131Te. Level systematics of tellurium nuclei are presented, and both single-particle and collective aspects of the level spectra are discussed.

A three-stage detector for heavy fragments and light particles emitted in heavy ion collisions

A low threshold charged particle three-stage detector has been designed, built and successfully tested. A truncated pyramidal geometry has been chosen to use the device as an element in a large solid angle array for heavy ion nuclear experiments. Angular resolution of 0.4° at 35 cm from the target, energy resolution of about 1% for the elastically scattered ions and Z resolving power of 63 for Z = 17 have been achieved in the 35Cl+ 64Ni reaction at 280 MeV incident energy.

Fluctuations in the excitation functions of dissipative heavy ion collisions

Excitation functions have been measured for different charge products of the 28Si + 64Ni reaction in the range 120–126.75 MeV in 250 keV steps (lab). Dissipative cross sections have shown fluctuations with coherence energies in the range 200–800 keV (CM). The formation of a dinuclear intermediate system is suggested.

Thermal neutron induced ?-particle reaction on64, 65, 67Zn and77Se

The (n th,α) reaction spectroscopy was done on64, 65, 67zn and77Se at the 87 m curved thermal neutron guide of the Grenoble high flux reactor. In each of the64Zn(n, α)61 Ni and67 Ni(n, α) 64Ni reactions, one line showed up corresponding to anα-particle transition to the first excited state in61Ni and64Ni withσ α1=11±3 μb and 159±20 μb respectively. In the case of the radioactive65Zn(T 1/2=244d) nucleus, two lines showed up corresponding to the ground state and the first excited state transitions in62Ni with large values ofσ α0=1.0±0.1b andσ α1=1.0±0.1b. For the77Se(n, α)74Ge reaction, the ground state and first excited transitions were present withσ α0=940±20 μb andσ α1 = 30±5 μb respectively. The spin-parity (J π) of the neutron resonance contributing at thermal energy are discussed.

Do many-particle reactions contribute to ‘deep-inelastic’ peaks?

Energy spectra and angular distributions of light particles ( Z = 3–8) produced in the reactions 13C+ 58, 60, 64Ni have been measured at 105 MeV. Coincidence events between light outgoing particles Li, Be, B and α, p have been observed for the first time in the 13C+ 58Ni and 13C+ 64Ni reactions. The results show that at least part of the ‘deep-inelastic’ events are due to many-particle reactions.