Investigation of proton induced reactions in light nuclei using proportional counter

by John Orem Fillmore Dorsett

Publisher: Ohio State University

Written in English
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  • Nuclear physics
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Open LibraryOL24979597M

  D Chemical-Shift Standards and Units. Chemical shifts always are measured with reference to a standard. For protons or \(^{13}C\) in organic molecules, the customary standard is a tetramethylsilane, \(\left(CH_3 \right)_4 Si\), which gives strong, sharp nmr signals in regions where only a very few other kinds of protons or carbon nuclei absorb.. Chemical shifts often are expressed in. Fusion measurements in light and medium mass heavy-ion reactions: Progress report for the period of June 1, induced fission (NF), charged-particle induced fission (CPF), and projectile fragmentation or fission (PF). The stable isotopes were identified using mass spectroscopy (MS). Heavy ions are all nuclei with an atomic mass larger than A = 4 [13]. Light particles also include neutrons produced by accelerators.   Proton Decay • The proton decay reaction is thus;- 𝑍 𝐴 𝑃 → 𝑧−1 𝐴−1 𝐷∗ − + 1 1 𝑝 • In this reaction P and D refer to atoms of the parent and daughter. Electron Capture • In the quantum mechanical model of an atom, the orbital electrons have a finite (but small) probability of spending some time inside the.

Heavy ions are all nuclei with an atomic mass larger than A=4 [14]. Light particles also include neutrons produced by accelerators. The discovery of each sodium isotope is discussed in detail and a summary is presented in Table 1. 18Na Zerguerras et al. discovered 18Na as reported in the paper \Study of light proton-rich nuclei by complete. Abstract. Light proton-rich bound and unbound nuclei were produced by means of stripping reactions of secondary beams of 20 Mg and 18 Ne. The decays of the unbound nuc19 Na have been measured by detecting their decay produ18 Ne and one proton and by performing an invariant-mass reconstruction. For 18 Na, the present work is the first measurement of its decay. helium. The heavier nuclei such as nuclei of carbon, oxygen, etc., could be synthesized only in the course of thermonuclear reactions in stars. The cause of it is that there is a certain interval of instability of light nuclei located near the lithium nucleus, and this interval cannot be surmounted in the course of the primeval nucleosynthesis. Abstract. The cross sections for the production of 7 Be, 22 Na, 24 Na, 28 Mg, 38 S, 38 Cl, and 39 Cl nuclei from Sn, Sn, Sn, and Sn targets irradiated with , , and GeV protons were measured by the method of induced activity. In analyzing resulting data, it was established that the above nuclei are produced in the fragmentation process and that the reaction cross.

The proton–proton chain reaction, also commonly referred to as the p-p chain, is one of two known sets of nuclear fusion reactions by which stars convert hydrogen to dominates in stars with masses less than or equal to that of the Sun, whereas the CNO cycle, the other known reaction, is suggested by theoretical models to dominate in stars with masses greater than about times. happen in some nuclei, and when it does the charge of the nucleus goes up by one, and an electron and a neutrino are spit out. The electron is called a "beta particle" in this context. - Other nuclei decay differently, for example by emitting an entire helium-4 nucleus (ppnn), called in . Deep nuclear spallation reactions induced by high-energy light particles on complex nuclei were investigated. Experimental studies involve activation of various medium to heavy mass targets bombarded by pi-mesons, protons and alpha particles. A prime objective is to deconvolve the cascade and evaporation steps in the reaction mechanism. Two proton radioactivity in Fe and Ni - CERN Posted by kahyl on Leave a comment (0) Go to comments [PDF] Two-proton radioactivity and three-body decay.

Investigation of proton induced reactions in light nuclei using proportional counter by John Orem Fillmore Dorsett Download PDF EPUB FB2

Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection Investigation of proton induced reactions in light nuclei using proportional counter.

knowledge of proton-induced spallation reactions is relevant both for fundamental research and for technical applications. Among the latter, the design of accelerator-driven systems (ADS) and radioactive ion-beam facilities (RIB) relies strongly on the knowledge of the formation cross sections of residual nuclei produced in such reactions.

This. Proton-proton cycle, chain of thermonuclear reactions that is the chief source of the energy radiated by the Sun and other cool main-sequence stars. Another sequence of thermonuclear reactions, called the carbon cycle, provides much of the energy released by hotter stars.

In a proton-proton cycle. The cross sections of photon induced reactions have been measured using monochromatic radiation from proton capture in light nuclei.

The most commonly used radiation has been the Li^(p,y)Be^ reaction at the Kev resonance. The (y»p) and (p,y) reaction cross sec­Author: Bruce Mainsbridge.

The reaction products were analysed by the usual A E l E technique, the AE detector being a gas-filled proportional counter, the E detector a silicon sur- face barrier counter.

With targets of about 80 fig/cm2 and windows of 1 x mm2 in a distance of mm from the target, the total energy resolution was keV for light reaction Cited by: the average kinetic energy of protons in the two nuclei as a function of the maximum measured momentum.

It is crucial to measure these in A = 3 nuclei since these are the simplest asymmetric mirror nuclei and the only ones for which precisions calculations of the (e,e. p) reaction exist. This proposal was deferred by PAC After investigations on fundamental properties of a newly constructed BCC using heavy ion beams and alpha-particles, this method was applied successfully to a fragment production measurement for 70 MeV proton-induced reactions on carbon.

With this technique, the energy threshold of the BCC was improved without introducing an additional detector. Differential cross sections at the first peak of L = 0 angular distributions of ground-state transitions in (p, t) reactions have been measured with a MeV proton beam for target nuclei with A.

The excited states of 71Ge have been investigated via the 71Ga (P, nγ) 71Ge reaction with the proton beam Investigation of proton induced reactions in light nuclei using proportional counter book from to MeV.

The parameters of the nuclear level density formula have. Reaction cross sections for Cr and Y induced by neutrons at MeV were measured by using 7Li(p,n) reaction at N0 beam line in the Research Center for Nuclear Physics (RCNP), Osaka University. Triton, α-particle, five- and nine-nucleon transfer reactions induced by 19 F in 12 C and 16 O in 11 B at incident energies above the Coulomb barrier have been measured in order to study the nuclear structure of 15 N, 16 O and 20 Ne, and the reaction mechanism.

The possibility of obtaining spectroscopic information by a comparison of the spectra and cross sections in the different reactions. most probable scenario of proton - nucleus reaction, what will be shown also in this dissertation. The main idea of this work concerns theoretical study of proton induced spallation reactions in wide range of incident energy and mass of target nuclei; fission and fragmentation are not discussed in details.

In continuation of our high-spin studies in neutron-rich ^Pu, ^Cm nuclei, using deep-inelastic and transfer reactions [1], we report on new spectroscopic information in the N =   The quasi-free scattering reactions 11 C (p, 2 p) 11,12 C (p, p n) have been studied in inverse kinematics at beam energies of – MeV/u at the R 3 B-LAND setup.

The outgoing proton-proton and proton-neutron pairs were detected in coincidence with the reaction fragments in kinematically complete measurements. particles from nuclear reactions induced by protons of M~V. In particular, studies of (p, p‘) (Strauch and Titus a, b, Dickson and SalterTyrCn and Maris a, b, ) and (p,2p) reactions (TyrCn, Hillman and MarisGooding and Pugh ) cast much light on nuclear structure problems.

Measurement of double-differential cross-sections of charged-particle emission induced by 14 MeV neutrons is quite important for estimating the nuclear heating and material damage of a fusion reactor. However, there are few experimental data available in spite of the importance of the nuclear reactions of light nuclei in fusion reactor development.

Double-differential cross sections for proton and deuteron production in fast neutron induced reactions on carbon are reported for three incident neutron energies:, and MeV.

In this paper the survey of the current state of investigation of two-proton radioactivity and related processes (three-body decays) is presented. The three-body (core + p + p) theoretical model of two-proton radioactivity based on the hyperspherical harmonics method and approximate boundary conditions of the Coulomb’s three-body problem specific for the studied class of processes is considered.

IMF region, obtained from reactions induced by MeV protons on heavy target nuclei, and the corresponding analysis performed with Monte Carlo calculations using the CRISP code [8, 9], as described below.

THEORETICALASPECTS OF IMF FORMATION It is generally assumed that, at intermediate energies, the nuclear reaction proceeds in two stages. The number of nuclei in a sample that will decay in a given interval of time is proportional to the number of nuclei in the sample.

This condition leads to radioactive decay showing itself as an exponential process, as shown in Fig. The number, N, of the original nuclei remaining after a time t from an original sample of N 0 nuclei is N. Proton and neutron density distributions where Vc(r) is the Coulomb in order to calculate the neutron distribution, the term proportional to (N - Z)/A in the nucleon-nucleus potential is replaced by Pl(r)/Po(r) where where p(r) is the radial density, and the self-consistent solution to the coupled equations for neutrons and protons with.

Over the last few years, much progress has been made towards the understanding of basic properties of nuclei with extreme neutron to proton ratios.

However, the study of phenomena involving spin polarized nuclei near the drip lines remains practically unexplored. The importance of such studies lies in the fact that the most complete knowledge of the scattering matrix is obtained in reactions.

P01 –Studies of low-energy K interactions with light nuclei by AMADEUS Raffaele Del Grande, INFN-LNF, Italy P10 Efficiency investigation of wide area gas proportional counter in relationship with pressure and type of filled gas P72 Investigation of fusion dynamics for reactions induced by Si isobars at similar Ec.m.

through a variety of -particle induced reactions. For instance, the 13C(;n)16O and 22Ne(;n)25Mg reac-tions which are the main sources of neutrons in the slow neutron-capture process (s-process).

Moreover, many (;n) reactions have been found to be relevant for the nucleosynthesis of light nuclei in the rapid. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link). Excitation functions of the /sup 24/Mg(/sup 16/O,/sup 12/C)/sup 28/Si and /sup 24/Mg(/sup 16/O,/sup 16/O)/sup 24/Mg reactions to the ground states and first-excited 2/sup +/ states in /sup 28/Si and /sup 24/Mg have been measured at theta/sub c.m./=/sup 0/ over the energy range 24reaction is known to exhibit a.

The total non-elastic cross-section for proton-induced nuclear reactions has a threshold, on the order of 8 MeV in the atomic nuclei of biologically relevant elements, which rises rapidly to a maximum at around 20 MeV, then asymptotically declines.

arXiv:nucl-th/v1 24 Jan EPJ manuscript No. (will be inserted by the editor) K+ production in proton-nucleus reactions and the role of momentum-dependent potentials Z.

Rudy 1, W. Cassing2, L. Jarczyk1, B. Kamys1, and P. Kulessa,3 1 M. Smoluchowski Institute of Physics, Jagellonian University, PL Cracow, Poland 2 Institut fu¨r Theoretische Physik, Justus Liebig Universitat. The use of (3 He, n) reactions [41–44] is also a convenient method for studying proton-rich nuclei of astrophysical interest.

Starting from a stable target, the reaction often has been used to study radioactive nuclei that may be important in explosive astrophysical scenarios. Abstract. Various targets were bombarded with protons in the 40 to Mev region, and the gamma spectra were detected and analyzed.

Under the assumption that the gamma rays originated from the deflected protons, the purpose of the experiment was to obtain information about the nature of the nuclear interactions through which the protons suffered changes of states.

Investigation of Proton-Proton Short-Range Correlations via the 12C(e,e′pp) struck proton in the quasi-elastic (p,2p) reaction. Data labeled by 94 and 98 are from Refs. [28,30], respectively. A schematic plot of a single auxiliary plane counter, with the light guide, the PMT.a proton in the nucleus breaks down into nuetron under the influence of the weak nucleur force a beta plus particle and an electron nuetrino are emmited.

A beta plus particle is a positron. Beta plus occurs in nuclei where there are too many protons compared to nuetrons, relative to the zone of stability. Charge and mass must be conserved. Double-differential cross sections (DDXs) have been measured for light-charged particle production in proton-induced reactions on 12 C, 27 Al, 58 Ni, 90 Zr, Au, and Bi at incident energies of 42 and 68 MeV.

The measured DDXs for 12 C, 27 Al, and 58 Ni are compared with the LA evaluation. Good overall agreement is found except for the (p, xd) reaction.