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in subjects: "Decay"

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Precision Measurement of X-Rays and Gamma Rays in Radioactive Decay

Thesis discussing the examination of radiation spectra emitted in the decay of various nuclides using a 10-inch bent-crystal spectrometer. For the most part, the radiations observed were x-rays and very soft gamma rays.

Date: June 1952

Creator: Browne, Charles Idol Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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New Radionuclide Generator Systems for Use in Nuclear Medicine

A current emphasis in nuclear medicine is to better match the physical lifetime of the radionuclides used in vivo for diagnosis and treatment to the biological lifetime of the diagnostic procedure or to minimize radiation dose to areas other than those to be treated. In many cases the biological lifetime is on the order of minutes. Since the direct production of radionuclides with half lives of minutes requires the user to be near a suitable reactor or accelerator, this study was undertaken to … more

Date: 1979

Creator: Atcher, Robert Whitehill

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Tables for the Calculation of Radioactive Equilibrium From Bateman's Equation

Abstract: Tables of decay constants and functions thereof are presented to simplify the problem of calculating the constants involved in the Bateman equation. An alternate method of solving for the amounts of the nth member of a radioactive series is given in the form of a power series.

Date: July 1953

Creator: Flanagan, F. J. & Senftle, F. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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K⁻ -p Interactions at 2.24 Bev/c II: Production Properties

The purpose of this note is to report various properties of the production modes of K -p interactions at 2.24 Bev/c. Specifically, we present 1) preliminary estimates of the partial cross sections, 2) production angular distributions for those combinations of channels which we believe to be well identified, and 3) for channels of particular interest, we present up-down decay distributions from which hyperon polarization information is obtained. Many of the observed final states which are called… more

Date: 1962

Creator: Bertanza, L.; Brisson, V.; Connolly, P.L.; Hart, E. L.; Mittra, I.S.; Moneti, G.C. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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2007 Nuclear Data Review

The results of a review and evaluation of neutron and non-neutron nuclear data published in the scientific literature are presented. The status of new chemical elements is examined. Data on revised values for the isotopic composition of the elements are reviewed and recommended values are presented. Half-lives of very long-lived nuclides are presented, including double beta decay, double electron capture, long-lived alpha decay and long-lived beta decay. Data from new measurements on the very h… more

Date: May 5, 2008

Creator: Holden, N. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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HALF-LIVES OF LONG-LIVED ALPHA DECAY, BETA DECAY, ELECTRON CAPTURE DECAY, BETA BETA-DECAY, PROTON DECAY AND SPONTANEOUS FISSION DECAY NUCLIDES.

In his review of radionuclides for dating purposes, Roth noted that there were a large number of nuclides, normally considered ''stable'' but which are radioactive with a very long half-life. Roth suggested that I review the data on the half-life values of these long-lived nuclides for the 2001 Atomic Weights Commission meeting in Brisbane. I provided a report, BNL-NCS-68377, to fulfill Roth's request. Peiser has now made a similar suggestion that I review these data for our next Commission mee… more

Date: August 8, 2003

Creator: HOLDEN, H. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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An Experimental Check On The Range-Energy Curve Of Pions In Propane

The kinetic energies of pions from radioactive decays in propane have been determined by using the information given by the angles of the secondary particles. This method is independent of any range-energy relation.

Date: October 24, 1960

Creator: Patrick, Jack W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Delayed neutron emission from mass-separated fission products

Thesis. Delayed neutron characteristics of six fission product nuclides were determined using a mass separator operated on-line with a nuclear reactor. Beta-decay half-lives were- measured using neutron multiscaling techniques for the precursors /sup 88/Br, /sup 89/Br, /sup 98/Kr, /sup 93/Kr, /sup 137/I, and / sup 138/I. The observed half-lives were 16.52 plus or minus .17 seconds, respectively.. Energy spectra were measured for delayed neutrons emitted in the beta-decays of /sup 17/N, /sup 137… more

Date: February 1, 1974

Creator: Norman, J.H.

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

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The decay pi{sup 0} {yields} gamma gamma to next to leading order in Chiral Perturbation Theory

The pi{sup 0} {yields} gamma gamma decay width is analyzed within the combined framework of Chiral Perturbation Theory and the 1/N{sub c} expansion up to order(p{sup 6}) and order(p{sup 4} x 1/N{sub c}) in the decay amplitude. The eta' is explicitly included in the analysis. It is found that the decay width is enhanced by about 4% due to the isospin-breaking induced mixing of the pure U(3) states. This effect, which is of leading order in the low energy expansion, is shown to persist nearly unc… more

Date: May 1, 2002

Creator: Goity, J. L.; Bernstein, A. M.; Donoghue, J. F. & Holstein, B. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Radiative Decays, Nonet Symmetry and SU(3) Breaking

We re-examine the problem of simultaneously describing in a consistent way all radiative and leptonic decays of light mesons (V {yields} P{gamma}, P {yields} V{gamma}, P {yields} {gamma}{gamma}, V {yields} e{sup +}e{sup -}). For this purpose, we rely on the Hidden Local Symmetry model in both its anomalous and non-anomalous sectors. We show that the SU(3) symmetry breaking scheme proposed by Bando, Kugo and Yamawaki, supplemented with nonet symmetry breaking in the pseudoscalar sector, allows o… more

Date: June 30, 1999

Creator: O'Connell, Heath B

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Partial waves of baryon-antibaryon in three-body B mesondecay

The origin of the reversed angular correlation in thecontext of the pp-bar partial waves in the baryonic decay modes of Bmesons.

Date: September 20, 2006

Creator: Suzuki, Mahiko

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nuclear Decay Schemes in the Actinium Family

Abstract: "With magnetic alpha-particle and electron high-resolution spectrographs and scintillation gamma-ray spectrometers, a study was made of the nuclear decay of a number of members of the actinium family - U-235, Th-227, Ra-223, Em-219, Po-215, and Bi-211. Decay schemes are presented for each of these nuclides, together with such correlations as are possible with present theoretical nuclear models. The decay scheme of U-235 and a portion of that of Th-227 are interpretable in terms of the… more

Date: July 1957

Creator: Pilger, Richard Christian, Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Nuclear structure problems in double beta decay

We summarize some of the nuclear structure issues in theoretical treatments of BETABETA decay, emphasizing several of the less well-tested approximations commonly made. 16 refs.

Date: January 1, 1984

Creator: Haxton, W. C. & Stephenson Jr., G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nuclear Thermodynamics of the Heaviest Elements. II

The masses of the isotopes of the heaviest elements have been calculated from known decay data in the region, extended by means of decay energies calculated from closed decay-energy cycles and estimated from the systematics of alpha and beta decay energies. The absolute values of the masses are based on the mass-spectrometrically determined mass of Pb{sup 208} and a few measured neutron binding energies. The half-life systematics of alpha decay and spontaneous fission are also presented, and so… more

Date: October 1, 1957

Creator: Foreman Jr., Bruce M. & Seaborg, Glenn T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Nuclear Thermodynamics of the Heaviest Elements. II

Date: January 1, 1958

Creator: Foreman Jr., Bruce M. & Seaborg, Glenn T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Heavy meson observables via Dyson-Schwinger equations

The authors summarize a Dyson-Schwinger-equation-based calculation of an extensive range of light- and heavy-meson observable, characterized by heavy-meson leptonic decays, semileptonic heavy-to-heavy and heavy-to-light transitions--B {yields} D*, D, {rho}, {pi}; D {yields} K*, K, {pi}, radiative and strong decays--B*{sub (s)} {yields} B{sub (s)}{gamma}; D*{sub (s)}{gamma} and the rare B {yields} K*{sub {gamma}} flavor-changing neutral-current process. In the calculation the heavy-quark mass fu… more

Date: June 28, 2000

Creator: Ivanov, M. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Measurement of the t tbar production cross section at D0

We report on the results from the analyses of {ital t}{ital {anti t}} decays in {ital dilepton} and {ital lepton+jets} modes with {approx}100 pb{sup -1} of {ital p}{ital {anti p}} Collider data at {radical}s = 1.8 TeV collected by the D{null} experiment at the Fermilab Tevatron. We have observed 37 {ital t}{ital {anti t}} candidate events while the estimated background is 13.4 {+-} 3.0 events. The {ital t}{ital {anti t}} production cross section has been measured to be 5.2 {+-} 1.8 pb at a top … more

Date: August 1, 1996

Creator: Bhat, P.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nuclear Decay Schemes of Some of the Isotopes of Tantalum (Master's Thesis)

This report discusses a nuclear spectroscopic study of the radiations resulting from the electron capture decay of Ta-176, Ta-177, and Ta-178, analyzing data of nuclear decay schemes.

Date: January 25, 1956

Creator: Felber, Frank Frederick, Jr.

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

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A,B,C`s of nuclear science

This introductory level presentation contains information on nuclear structure, radioactivity, alpha decay, beta decay, gamma decay, half-life, nuclear reactions, fusion, fission, cosmic rays, and radiation protection. Nine experiments with procedures and test questions are included.

Date: August 7, 1995

Creator: Noto, V.A.; Norman, E.B.; Chan, Yuen-Dat; Dairiki, J.; Matis, H.S.; McMahan, M.A. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Neutrino mass

Neutrinos play a dominant role in both particle physics, astrophysics, and cosmology. In the our present understanding of the strong, weak, and electromagnetic forces, the group structure of the Standard Model is SU(3)[sub C] [circle times] SU(2)[sub L] [circle times] U(I)[sub EM]. In the Weinberg-Salam-Glashow Standard Electroweak Model, left-handed neutrinos sit in a doublet, while right-handed neutrinos are in a singlet, and therefore do not interact with the other known particles. Also in t… more

Date: January 1, 1993

Creator: Bowles, T. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The many aspects of neutrino physics

In mid-November, over seventy physicists gathered at Fermilab for an informal workshop on the Many Aspects of Neutrino Physics, which dovetailed with and also helped lay the groundwork for the succeeding more narrowly focused conference on Long Baseline Neutrino Oscillations. The workshop indeed covered many of the interrelated aspects of neutrino physics: 17 keV neutrinos (experiments, theoretical models, and astrophysical constraints), neutrino properties (double beta decay experiments, neutr… more

Date: January 1, 1992

Creator: Frieman, J.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Squark Mixing Contributions to CP violating phase gamma

We investigate the possibility that the CP violation due to the soft supersymmetry breaking terms in squark mixing can give significant contributions to the various $\gamma$ related parameters in B decays, different from those of the Standard Model. We derive the new limits on $(\delta^u_12)_LL,LR,RR$ and on $(\delta^d_23)_LL,LR,RR$ from the recent data on $D^0$--$\barD^0$ oscillation as well as those on $B_s^0$--$\barB_s^0$ oscillation. We show that, together with all the other constraints, th… more

Date: September 17, 2001

Creator: Chang, Darwin; Chang, We-Fu; Keung, Wai-Yee; Sinha, Nita & Sinha, Rahul

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Factorization in B ---> V Gamma Decays

The factorization properties of the radiative decays B {yields} V{gamma} are analyzed at leading order in 1/m{sub b} using the soft-collinear effective theory. It is shown that the decay amplitudes can be expressed in terms of a B {yields} V form factor evaluated at q{sup 2} = 0, light-cone distribution amplitudes of the B and V mesons, and calculable hard-scattering kernels. The renormalization-group equations in the effective theory are solved to resum perturbative logarithms of the different… more

Date: March 1, 2005

Creator: Becher, Thomas; Hill, Richard J. & Neubert, Matthias

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Search for Oscillation of the Electron-Capture Decay Probability of Pm-142

We have searched for time modulation of the electron capture decay probability of 142Pm in an attempt to confirm a recent claim from a group at the Gesellschaft fur Schwerionenforschung (GSI). We produced 142Pm via the 124Sn(23Na, 5n)142Pm reaction at the Berkeley 88-Inch Cyclotron with a bombardment time short compared to the reported modulation period. Isotope selection by the Berkeley Gas-filled Separator is followed by implantation and a long period of monitoring the 142Nd K alpha x-rays fr… more

Date: July 3, 2008

Creator: Vetter, Paul A; Vetter, Paul; Clark, Roderick; Dvorak, Jan; Freedman, Stuart; Gregorich, Kenneth et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department