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Some Comments on the La Primavera Geothermal Field, Mexico

Description: The La Primavera geothermal field is located about 20 km west of the city of Guadalajara, Jalisco, in the western part of the Mexican Neovolcanic Axis. Initial results of five deep exploration wells (down to 2000 m depth) were very promising; measured downhole temperatures exceed 300/sup 0/C. During production, however, downhole temperatures dropped, and the chemistry of the fluids changed. The analysis of geologic, mineralogic, geochemical, and well completion data indicate that colder fluids … more
Date: December 1, 1983
Creator: A., B. Dominguez & Lippmann, M. J.
open access

Some Comments on the La Primavera Geothermal Field, Mexico

Description: The La Primavera geothermal field is located about 20 km west of the city of Guadalajara, Jalisco, in the western part of the Mexican Neovolcanic Axis. Initial results of five deep exploration wells (down to 2000 m depth) were very promising; measured downhole temperatures exceed 300{degrees}C. During production, however, downhole temperatures dropped, and the chemistry of the fluids changed. The analysis of geologic, mineralogic, geochemical, and well completion data indicate that colder fluid… more
Date: December 15, 1983
Creator: A., Bernardo Dominguez & Lippmann, Marcelo J.
open access

Development and evaluation of systems for controlling parallel high di/dt thyratrons

Description: Increasing numbers of high power, high repetition rate applications dictate the use or thyratrons in multiple of hard parallel configurations to achieve the required rate of current rise, di/dt. This in turn demands the development of systems to control parallel thyratron commutation with nanosecond accuracy. Such systems must be capable of real-time, fully-automated control in multi-kilohertz applications while still remaining cost effective. This paper describes the evolution of such a contro… more
Date: January 1, 1982
Creator: A., Litton. & McDuff, G.
open access

Management of intermediate-level radioactive wastes in the United States

Description: While used extensively, the term intermediate-level waste is not a clearly defined waste category. Assuming the ILW includes all radioactive wastes requiring shielding but not ordinarily included in a high-level waste canister, its major sources include power plant operations, spent fuel storage, and spent fuel reprocessing. While the volume is approx. 10/sup 2/ greater than that of high-level waste, ILW contains only approx. 1% of the radioactivity. Power plant waste, constituting approx. 87% … more
Date: July 1, 1980
Creator: Aaberg, R.L.; Lakey, L.T. & Greenborg, J.
open access

Measurement of instantaneous shut-in pressure in crystalline rock

Description: A method is defined which was found useful, not only for determining the instantaneous shut-in pressure (ISIP) during fracture creation, but also for determining the pressure inside the fracture, near the exit and entrance wellbores, when a circulation of fluid through a fracture is taking place. The basic assumption of the Muskat method is that, after a short transient period, the shut-in pressure approaches an asymptotic value, Pa, in an exponential fashion, i.e., if Pa is subtracted from P a… more
Date: January 1, 1981
Creator: Aamodt, L. & Kuriyagawa, M.
open access

Hot dry rock geothermal reservoir engineering

Description: Two wells, GT-2 and EE-1, were originally drilled to a depth of 9600 ft (2.93 km) and 10,000 ft (3.05 km), respectively, and, after some difficulties, including redrilling of the bottom portion of GT-2, a good fracture connection was made between EE-1 and GT-2B, as the modified GT-2 was called. The circulation system was studied extensively for the purpose of establishing a number of fracture properties. Techniques were developed to determine orientation, geometry, heat exchange area, volume, f… more
Date: January 1, 1980
Creator: Aamodt, R. L.
open access

Development of thin foils for use in generating neutral particle beams

Description: The Isotope Research Materials Laboratory (IRML) was requested to prepare large-area, ultrathin aluminum and carbon foils for use in beam neutralization experiments. There were two major parts to this request. The first was to immediately provide a number of 5-cm-dia foils 5 to 20 ..mu..g/cm/sup 2/ thick for use in experiments at the Fusion Materials Irradiation Test (FMIT) facility and at Argonne National Laboratory (ANL). The second, longer-term request was to develop methods to prepare 25-cm… more
Date: January 1, 1986
Creator: Aaron, W. S.; Zevenbergen, L. A.; Adair, H. L.; Culpepper, C. A.; McCulla, W. H.; Nolan, T. A. et al.
open access

Preparation of thin films for use in generating neutral particle beams

Description: Large-area, thin aluminum foils were prepared for use in beam neutralization experiments. The foils were made using either electron beams of resistance heating. Foil thickness and uniformity were determined using alpha particles. The foils perform very well when bombarded by energetic H/sup -/ ions. (DLC)
Date: January 1, 1986
Creator: Aaron, W.S.; Zevenbergen, L.A. & Adair, H.L.
open access

Limit on tau neutrino mass

Description: Using the complete data sample of 300 pb/sup -1/ collected by the HRS spectrometer in e/sup +/e/sup -/ collisions at 29 GeV, mass limit for the tau neutrino is set. The end point of the hadronic mass spectrum is determined in the decays tau ..-->.. 5..pi../sup + -/nu/sub tau/ and tau ..-->.. 5..pi../sup + -/..pi../sup 0/nu/sub tau/. At 95% confidence level, an upper limit of M/sub nu/sub tau// < 76 MeV/c/sup 2/, is found. 8 refs., 4 figs.
Date: January 1, 1986
Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Beltrami, I.; Blockus, D.; Bonvicini, G. et al.
open access

Charm D production in e/sup +/e/sup -/ annihilation at 29 GeV

Description: Results are presented on the analysis of charm D Production from 300 pb/sup -1/ of data taken with the HRS Detector at PEP. The electroweak asymmetry is -8.4 +- 3.6% and R (D + D*) = 1.57 +- 0.17. Fragmentation functions for D/sup 0/, D/sup +/, D*/sup +/ production and the results of a search for the D** are given. 10 refs., 9 figs.
Date: January 1, 1986
Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
open access

Inclusive. eta. production in. tau. decays

Description: We have searched for inclusive eta production in tau decays using a sample of 2553 events of e{sup +}e{sup minus} {yields} {tau}{sup +}{tau}{sup minus} in the one-three topology. The data were taken with the High Resolution Spectrometer at {radical}s = 29 GeV. Our results are based on an analysis of the {pi}{sup +}{pi}{sup minus} invariant mass spectrum to find the narrow peak resulting from the decay sequence {tau} {yields} {eta}x and {eta} {yields} {pi}{sup +}{pi}{sup minus}{pi}{degree}. No c… more
Date: January 1, 1987
Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
open access

Limit on tau decay to 7-charged tracks

Description: Using the complete data sample of 300 pb/sup -1/ from e/sup +/e/sup -/ collisions at 29 GeV, the HRS collaboration has searched for tau decay to 7 charged particles and any number of neutrals. No events were found. The corresponding upper limit to the branching ratio is B(tau ..-->.. 7..pi../sup + -/ + n..gamma.. + nu/sub tau/) < 3.8 x 10/sup -4/ at 90% confidence level. Using the final HRS data sample we also report updated branching ratios for tau ..-->.. 5..pi../sup + -/ + nu/sub tau/ and ta… more
Date: January 1, 1986
Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
open access

Measurement of the D/sup 0/ meson lifetime

Description: We report the measurement of the lifetime of the D/sup 0/ meson. The direct observation of the decay vertex distribution in the process D/sup 0/ ..-->.. K/sup -/..pi../sup +/ was made using a vertex chamber installed in the HRS detector at PEP. The measured lifetime is found to be tau/sub D/sup 0// = .42 +- .09 +- .06ps. 5 refs., 4 figs.
Date: January 1, 1986
Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
open access

Measurement of the electroweak asymmetry in the reaction e/sup +/e/sup -/. -->. tau/sup +/tau/sup -/ at 29 GeV

Description: This paper reports the electroweak asymmetry in the reaction e/sup +/e/sup -/ ..-->.. tau/sup +/tau/sup -/ at 29 GeV. The results came from data taken with the High Resolution Spectrometer at PEP corresponding to an integrated luminosity of 256 pb/sup -1/. The 7372 observed events give A/sub tau tau/ = -(4.4 +- 1.4 +- 0.5)%. Events selected in the central region of the detector measure a total cross section of R/sub tau tau/ = 1.06 +- 0.02 +- 0.04. 5 refs., 1 fig.
Date: June 1, 1986
Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
open access

Multiplicity distributions in e/sup +/e/sup -/ annihilation at 29 GeV: a comparison with hadronic data

Description: The charged particle multiplicity distributions for single jets in e/sup +/e/sup -/ annihilation at 29 GeV have been measured using the High Resolution Spectrometer at PEP. The shape of the distribution agrees well with a Poisson distribution. No correlation is observed between the multiplicities in the two jets of an event. For fixed values of the prong number of the total event, the multiplicity sharing between the two jets is in good agreement with a binomial distribution. These observations… more
Date: June 1, 1986
Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
open access

Search for spin-dependent effects in c-quark fragmentation

Description: Events of the reaction e/sup +/e/sup -/ ..-->.. c anti c at 29 GeV were isolated by observing D* mesons through D*/sup +/ ..-->.. D/sup 0/..pi../sup +/ decay. The D/sup 0/ decay modes used are D/sup 0/ ..-->.. K..pi.., K3..pi.., and K..pi..(..pi../sup 0/). The data, which correspond to an integrated luminosity of 300 pb/sup -1/, were collected by the High Resolution Spectrometer at PEP. All angular distributions examined are consistent with being isotropic; there is no evidence for D* alignment… more
Date: 1986
Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
open access

Upper limit on the D*(2010) decay width

Description: We report a measurement of the upper limit of the decay width for the D*/sup +/(2010) meson using the High Resolution Spectrometer at PEP. We observed the charged D* production in the decay mode of D*/sup +/ ..-->.. D/sup 0/..pi../sup +/ with the D/sup 0/ decaying into the K/sup -/..pi../sup +/ mode. The peak in the mass difference distribution M(K/sup -/..pi../sup +/..pi../sup +/)-M(K/sup -/..pi../sup +/) was used to directly measure the decay width. The width is dominated by the detector reso… more
Date: June 1986
Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
open access

Production of eta mesons in e/sup +/e/sup -/ annihilations at. sqrt. s = 29 GeV

Description: Data from e/sup +/e/sup -/ annihilations at 29 GeV have been used to measure the production and fragmentation of eta mesons. The signal is observed in the eta ..-->.. ..gamma gamma.. decay channel. The fragmentation function for p/sub eta/ > 1.5 GeV/c agrees well with the shapes predicted by both the Lund and Webber models. However, the mean multiplicity is measured to be < n/sub eta/ > = 0.37 +- 0.08 eta mesons per hadronic annihilation event, which is significantly lower than the values predi… more
Date: June 15, 1987
Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J.M. et al.
open access

Search for D/sup *//sup 0/. -->. D/sup +/. pi. /sup -/

Description: We report on a search for the decay mode D/sup *//sup 0/(2007) ..-->.. D/sup +/..pi../sup -/ using the High Resolution Spectrometer at PEP. Although this decay is kinematically forbidden for the central mass value, it can occur through the natural width of the D/sup *//sup 0/. The D/sup +/ was reconstructed in the K/sup -/..pi../sup +/..pi../sup +/ decay mode. The mass difference distribution (K/sup -/..pi../sup +/..pi../sup +/..pi../sup +/) - (K/sup -/..pi../sup +/..pi../sup -/), which shows n… more
Date: January 1, 1987
Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J.M. et al.
open access

Asymmetry in the angular distribution of inclusive A baryons from e/sup +/e/sup -/ annihilations at. sqrt. s = 29 GeV

Description: The forward-backward asymmetry A expected from the ..gamma.. - Z/sup 0/ interference term in the process e/sup +/e/sup -/ ..-->.. q anti q is observed in the lab production angular distribution of high momentum A baryons. The data were collected with the High Resolution Spectrometer at PEP and an integrated luminosity of 256 pb/sup -1/ at ..sqrt..s = 29 GeV was used in the analysis. The asymmetry is seen to increase with the fractional energy z = 2E/..sqrt..s of the A due to the decreasing pres… more
Date: May 1986
Creator: Abachi, S.; Baringer, P.; Beltrami, I.; Bylsma, B. G.; DeBonte, R.; Koltick, D. et al.
open access

lambda. production in e/sup +/e/sup -/ annihilations at 29 GeV

Description: This paper presents measurements of the inclusive production cross sections of ..lambda.. baryons in e/sup +/e/sup -/ annihilations at ..sqrt..s = 29 GeV. The data sample corresponds to an integrated luminosity of 256 pb/sup -1/ collected with the High Resolution Spectrometer at PEP. Comparisons are made to the predictions of the Lund model. The data are well described using a strange diquark suppression parameter, (us/ud)/(s/d), of 0.89 +- 0.10/sub -0.16//sup +0.56/, and the measured ..lambda.… more
Date: May 1, 1986
Creator: Abachi, S.; Baringer, P.; Beltrami, I.; Bylsma, B.G.; DeBonte, R.; Koltick, D. et al.
open access

Observation of tensor and scalar mesons produced in e/sup +/e/sup -/ annihilation at 29 GeV

Description: The production of the tensor mesons, integral/sup 0/(1270) and K*/sup 0/(1430), and the scalar meson S(975) have been observed in e/sup +/e/sup -/ annihilation at 29 GeV center of mass energy, using data obtained with the HRS detector at the PEP storage ring. The mean multiplicities for meson momenta greater than 1450 MeV/c are <n/sub f/sup 0//> = 0.11 +- 0.04, <n/sub K*/sup 0/(1430)/> = 0.10 +- 0.06, and <n/sub S/> = 0.05 +- 0.02 per hadronic event. The fragmentation functions of the tensor me… more
Date: January 1, 1986
Creator: Abachi, S.; Baringer, P.; Bylsma, B. G.; DeBonte, R.; Koltick, D.; Loeffler, F. J. et al.
open access

Prospects for top at the Tevatron collider in the 1990's

Description: We calculated the signal and background rates for top masses of 90, 120, 150, and 180 GeV for both the CDF and D{null} detectors. This allowed us to determine the prospects for both discovery as well as detailed study of heavy top depending on the luminosity. We have focused on the leptons + jets and dilepton signatures. We also consider the question of tagging b-jets and how that should reduce background and help in making a mass determination. 8 refs., 5 figs., 5 tabs.
Date: January 1, 1989
Creator: Abachi, S.; Butler, J. (Fermi National Accelerator Lab., Batavia, IL (USA)); Baden, D. (Harvard Univ., Cambridge, MA (USA)); Barnett, B.; Matthews, J. A. (Johns Hopkins Univ., Baltimore, MD (USA)); Buchholz, D. (Northwestern Univ., Evanston, IL (USA)) et al.
open access

DIFFUSION IN VERY CHAOTIC HAMILTONIAN SYSTEMS

Description: We study nonintegrable Hamiltonian dynamics: H(I,{theta}}) = H{sub 0}(I)+kH{sub 1}(I,{theta}) for large k; that is, far from integrability. An integral representation is given for the conditional probability P(I,{theta},t|I{sub 0},{theta}{sub 0},t{sub 0}) that the system is at I,{theta} at t, given it was at I{sub 0},{theta}{sub 0} at t{sub 0}. By discretizing time into steps of size {epsilon}, we show how to evatuate physical observables for large k, fixed {epsilon}. An explicit calculation of… more
Date: December 1, 1980
Creator: Abarbanel, Henry D.I. & Crawford, John David
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