John M. Carpenter

Debris Disks in the Upper Scorpius OB Association (2009)

Carpenter, John M., Mamajek, Eric E., Hillenbrand , Lynne A., Meyer, Michael R.

We present MIPS 24 μm and 70 μm photometry for 205 members of the Upper Scorpius OB Association. These data are combined with published MIPS photometry for 15 additional association members to...

Debris Disks in the Upper Scorpius OB Association (2009)

Carpenter, John M., Mamajek, Eric E., Hillenbrand, Lynne A., Meyer, Michael R.

We present MIPS 24um and 70um photometry for 205 members of the Upper Scorpius OB Association. These data are combined with published MIPS photometry for 15 additional association members to assess...

Structure and Evolution of Pre-main-sequence Circumstellar Disks (2009)

Isella, Andrea, Carpenter, John M., Sargent, Anneila I.

We present new subarcsecond (~0".7) Combined Array for Research in Millimeter-wave Astronomy (CARMA) observations of the 1.3 mm continuum emission from circumstellar disks around 11 low- and...

Dynamically Driven Evolution of the Interstellar Medium in M51 (2009)

Koda, Jin, Scoville, Nick, Sawada, Tsuyoshi, La Vigne, Misty A., Voguel, Stuart N., Potts, Ashley E., ...

Massive star formation occurs in giant molecular clouds (GMCs); an understanding of the evolution of GMCs is a prerequisite to develop theories of star formation and galaxy evolution. We report the...

Testing the Evolutionary Sequence of High-Mass Protostars with CARMA (2009)

Schnee, Scott, Carpenter, John M.

We present 1" resolution Combined Array for Research in Millimeter-wave Astronomy (CARMA) observations of the 3 mm continuum and 95 GHz CH_3OH masers toward 14 candidate high-mass protostellar...

Structure and evolution of pre-main sequence circumstellar disks (2009)

Isella, Andrea, Carpenter, John M., Sargent, Anneila I.

We present new sub-arcsecond (0.7'') Combined Array for Research in Millimeter-wave Astronomy (CARMA) observations of the 1.3 mm continuum emission from circumstellar disks around 11 low and...

Grain Growth and Global Structure of the Protoplanetary Disk Associated with the Mature Classical T Tauri Star, PDS 66 (2009)

Cortes, Stephanie R., Meyer, Michael R., Carpenter, John M., Pascucci, Ilaria, Schneider, Glenn, Wong, Tony, ...

We present Australia Telescope Compact Array interferometric observations of the old (13 Myr), nearby (86 pc) classical T Tauri star (cTTS), PDS 66. Unresolved 3 and 12 mm continuum emission is...

Interferometric evidence for resolved warm dust in the DQ Tau system (2009)

Boden, Andrew F., Akeson, Rachel L., Sargent, Anneila I., Carpenter, John M., Ciardi, David R., Bary, Jeffrey S., ...

We report on near-infrared (IR) interferometric observations of the double-lined pre-main sequence binary system DQ Tau. We model these data with a visual orbit for DQ Tau supported by the...

Spitzer spectroscopy of circumstellar disks in the 5 Myr old upper Scorpius OB association (2009)

Dahm, S. E., Carpenter, John M.

We present mid-infrared spectra between 5.2 and 38 μm for 26 disk-bearing members of the ~5 Myr old Upper Scorpius OB association obtained with the Infrared Spectrograph (IRS) onboard the Spitzer...

Anachronistic Grain Growth and Global Structure of the Protoplanetary Disk Associated with the Mature Classical T Tauri Star, PDS 66 (2009)

Cortes, Stephanie R., Meyer, Michael R., Carpenter, John M., Pascucci, Ilaria, Schneider, Glenn, Wong, Tony, ...

We present ATCA interferometric observations of the old (13 Myr), nearby (86pc) classical T Tauri star, PDS 66. Unresolved 3 and 12 mm continuum emission is detected towards PDS 66, and upper limits...

Formation and evolution of planetary systems : properties of debris dust around solar-type stars (2009)

Carpenter, John M., Bouwman, Jeroen, Mamajek, Eric E., Meyer, Michael R., Hillenbrand, Lynne A., Backman, Dana E., ...

We present Spitzer photometric (IRAC and MIPS) and spectroscopic (IRS low resolution) observations for 314 stars in the Formation and Evolution of Planetary Systems Legacy program. These data are...

Spitzer Spectroscopy of Circumstellar Disks in the 5 Myr Old Upper Scorpius OB Association (2009)

Dahm, S. E., Carpenter, John M.

We present mid-infrared spectra between 5.2 and 38 microns for 26 disk-bearing members of the ~5 Myr old Upper Scorpius OB association obtained with the Infrared Spectrograph onboard the Spitzer...

A Resolved Ring of Debris Dust around the Solar Analog HD 107146 (2009)

Corder, Stuartt, Carpenter, John M., Sargent, Anneila I., Zauderer, B. Ashley, Wright, Melvyn C. H., White, Stephen M., ...

We present resolved images of the dust continuum emission from the debris disk around the young (80-200 Myr) solar-type star HD 107146 with CARMA at λ = 1.3 mm and the CSO at λ = 350 μ. Both...

A Sample of Very Young Field L Dwarfs and Implications for the Brown Dwarf “Lithium Test” at Early Ages (2008)

Kirkpatrick, J. Davy, Cruz, Kelle L., Barman, Travis S., Burgasser, Adam J., Looper, Dagny L., Tinney, C. G., ...

Using a large sample of optical spectra of late-type dwarfs, we identify a subset of late-M through L field dwarfs that, because of the presence of low-gravity features in their spectra, are believed...

The Formation and Evolution of Planetary Systems: Description of the Spitzer Legacy Science Database (2008)

Carpenter, John M., Bouwman, Jeroen, Silverstone, Murray D., Kim, Jinyoung Serena, Stauffer, John, Cohen, Martin, ...

We present the science database produced by the Formation and Evolution of Planetary Systems (FEPS) Spitzer Legacy program. Data reduction and validation procedures for the IRAC, MIPS, and IRS...

A Large-Area Search for Low-Mass Objects in Upper Scorpius. II. Age and Mass Distributions (2008)

Slesnick, Catherine L., Hillenbrand, Lynne A., Carpenter, John M.

We present continued results from a wide-field, ~150deg^2, optical photometric and spectroscopic survey of the northern part of the ~5 Myr old Upper Scorpius OB association. Photometry and spectral...

Formation and Evolution of Planetary Systems (FEPS): Properties of Debris Dust around Solar-type Stars (2008)

Carpenter, John M., Bouwman, Jeroen, Mamajek, Eric E., Meyer, Michael R., Hillenbrand, Lynne A., Backman, Dana E., ...

We present Spitzer photometric (IRAC and MIPS) and spectroscopic (IRS low resolution) observations for 314 stars in the Formation and Evolution of Planetary Systems (FEPS) Legacy program. These data...

A Large-Area Search for Low-Mass Objects in Upper Scorpius II: Age and Mass Distributions (2008)

Slesnick, Catherine L., Hillenbrand, Lynne A., Carpenter, John M.

We present continued results from a wide-field, ~150 deg^2, optical photometric and spectroscopic survey of the northern part of the ~5 Myr-old Upper Scorpius OB Association. Photometry and spectral...

A Sample of Very Young Field L Dwarfs and Implications for the Brown Dwarf "Lithium Test" at Early Ages (2008)

Kirkpatrick, J. Davy, Cruz, Kelle L., Barman, Travis S., Burgasser, Adam J., Looper, Dagny L., Tinney, C. G., ...

Using a large sample of optical spectra of late-type dwarfs, we identify a subset of late-M through L field dwarfs that, because of the presence of low-gravity features in their spectra, are believed...

Proplyds and massive disks in the Orion Nebula Cluster imaged with CARMA and SMA (2008)

Eisner, J. A., Plambeck, R. L., Carpenter, John M., Corder, S. A., Qi, C., Wilner, D.

We imaged a 2' × 2' region of the Orion Nebula Cluster (ONC) in 1.3 mm wavelength continuum emission with the recently commissioned Combined Array for Research in Millimeter Astronomy (CARMA) and...

The Formation and Evolution of Planetary Systems: Description of the Spitzer Legacy Science Database (2008)

Carpenter, John M., Bouwman, Jeroen, Silverstone, Murray D., Kim, Jinyoung Serena, Stauffer, John, Cohen, Martin, ...

We present the science database produced by the Formation and Evolution of Planetary Systems (FEPS) Spitzer Legacy program. Data reduction and validation procedures for the IRAC, MIPS, and IRS...

Molecular Gas in the z = 1.2 Ultraluminous Merger GOODS J123634.53+621241.3 (2008)

Frayer, David T., Koda, Jin, Pope, Alexandra, Huynh, Minh T., Chary, Ranga-Ram, Scott, Douglas, ...

We report the detection of CO(2→1) emission from the z = 1.2 ultraluminous infrared galaxy (ULIRG) GOODS J123634.53+621241.3 (also known as the submillimeter galaxy GN 26). These observations...

Molecular Gas in the z=1.2 Ultraluminous Merger GOODS J123634.53+621241.3 (2008)

Frayer, David T., Koda, Jin, Pope, Alexandra, Huynh, Minh T., Chary, Ranga-Ram, Scott, Douglas, ...

We report the detection of CO(2-1) emission from the z=1.2 ultraluminous infrared galaxy (ULIRG) GOODS J123634.53+621241.3 (also known as the sub-millimeter galaxy GN26). These observations represent...

The complete census of 70 μm-bright debris disks within "the formation and evolution of planetary systems" Spitzer legacy survey of sun-like stars (2008)

Hillenbrand, Lynne A., Carpenter, John M., Kim, Jinyoung Serena, Meyer, Michael R., Backman, Dana E., Moro-Martín, Amaya, ...

We report detection of cool dust surrounding solar-type stars from observations performed as part of the Spitzer Legacy Science Program FEPS. From a sample of 328 stars having ages ~0.003-3 Gyr we...

Proplyds and Massive Disks in the Orion Nebula Cluster Imaged with CARMA and SMA (2008)

Eisner, J. A., Plambeck, R. L., Carpenter, John M., Corder, S. A., Qi, C., Wilner, D.

[Abridged] We imaged a 2' x 2' region of the Orion Nebula cluster in 1.3 mm wavelength continuum emission with the recently commissioned Combined Array for Research in Millimeter Astronomy (CARMA)...

The complete Census of 70 μm-bright debris disks within ``the formation and evolution of planetary systems'' Spitzer Legacy Survey of Sun-like stars (2008)

Hillenbrand, Lynne A., Carpenter, John M., Kim, Jinyoung Serena, Meyer, Michael R., Backman, Dana E., Moro-Martí­n, Amaya, ...

We report detection of cool dust surrounding solar-type stars from observations performed as part of the Spitzer Legacy Science Program FEPS. From a sample of 328 stars having ages ~0.003-3 Gyr we...

The formation and evolution of planetary systems: description of the Spitzer Legacy Science database (2008)

Carpenter, John M., Bouwman, Jeroen, Silverstone, Murray D., Kim, Jinyoung Serena, Stauffer, John, Cohen, Martin, ...

We present the science database produced by the Formation and Evolution of Planetary Systems (FEPS) Spitzer Legacy program. Data reduction and validation procedures for the IRAC, MIPS, and IRS...

The Complete Census of 70-um-Bright Debris Disks within the FEPS (Formation and Evolution of Planetary Systems) Spitzer Legacy Survey of Sun-like Stars (2007)

Hillenbrand, Lynne A., Carpenter, John M., Kim, Jinyoung Serena, Meyer, Michael R., Backman, Dana E., Moro-Martin, Amaya, ...

(abbreviated) We report detection with the Spitzer Space Telescope of cool dust surrounding solar type stars. The observations were performed as part of the Legacy Science Program, ``Formation and...

The moth : an unusual circumstellar structure associated with HD 61005 (2007)

Hines, Dean C., Schneider, Glenn, Hollenbach, David, Mamajek, Eric E., Hillenbrand, Lynne A., Metchev, Stanimir A., ...

We present the discovery of an unusual spatially resolved circumstellar structure associated with the ≈90 Myr, nearby, G dwarf star HD 61005. Observations from the FEPS Spitzer Legacy Science...

Dynamical Masses for Pre-Main-Sequence Stars: A Preliminary Physical Orbit for V773 Tau A (2007)

Boden, Andrew F., Torres, Guillermo, Sargent, Anneila I., Akeson, Rachel L., Carpenter, John M., Boboltz, David A., ...

We report on interferometric and radial velocity observations of the double-lined 51 day period binary (A) component of the quadruple pre-main-sequence (PMS) system V773 Tau. With these observations...

� 1996. The American Astronomical Society. All rights reserved. Printed in U.S.A. A MASSIVE COMETARY CLOUD ASSOCIATED WITH IC 1805 (2007)

Mark H. Heyer, Christopher Brunt, Ronald L. Snell, John Howe, F. P. Schloerb, John M. Carpenter, ...

High-resolution, wide field imaging of 12 CO, 21 cm line and continuum, and IRAS far-infrared emissions from the outer Galaxy have identified a massive cometary molecular cloud associated with IC...

The dust, planetesimals and planets of HD 38529 (2007)

Moro-Martin, Amaya, Malhotra, Renu, Carpenter, John M., Hillenbrand, Lynne A., Wolf, Sebastian, Meyer, Michael R., ...

HD 38529 is a post-main sequence G8III/IV star (3.5 Gyr old) with a planetary system consisting of at least two planets having Msin(i) of 0.8 MJup and 12.2 MJup, semimajor axes of 0.13 AU and 3.74...

The dust, planetesimals, and planets of HD 38529 (2007)

Moro-Martín, Amaya, Malhotra, Renu, Carpenter, John M., Hillenbrand, Lynne A., Wolf, Sebastian, Meyer, Michael R., ...

HD 38529 is a post-main-sequence G8 III/IV star (3.5 Gyr old) with a planetary system consisting of at least two planets having Msini of 0.8 and 12.2 MJup, semimajor axes of 0.13 and 3.74 AU, and...

Are debris disks and massive planets correlated? (2007)

Moro-Martín, Amaya, Carpenter, John M., Meyer, Michael R., Hillenbrand, Lynne A., Malhotra, Renu, Hollenbach, David, ...

Using data from the Spitzer Space Telescope Legacy Science Program Formation and Evolution of Planetary Systems (FEPS), we have searched for debris disks around nine FGK stars (2-10 Gyr), known from...

The moth: an unusual circumstellar structure associated with HD 61005 (2007)

Hines, Dean C., Schneider, Glenn, Hollenbach, David, Mamajek, Eric E., Hillenbrand, Lynne A., Metchev, Stanimir A., ...

We present the discovery of an unusual spatially resolved circumstellar structure associated with the ~90 Myr, nearby, G dwarf star HD 61005. Observations from the FEPS Spitzer Legacy Science survey...

� 2007. The American Astronomical Society. All rights reserved. Printed in U.S.A. THE MOTH: AN UNUSUAL CIRCUMSTELLAR STRUCTURE ASSOCIATED WITH HD 61005 (2007)

Dean C. Hines, Glenn Schneider, David Hollenbach, Eric E. Mamajek, Lynne A. Hillenbr, Stanimir A. Metchev, ...

We present the discovery of an unusual spatially resolved circumstellar structure associated with the ≈90 Myr, nearby, G dwarf star HD 61005. Observations from the FEPS Spitzer Legacy Science...

Are Debris Disks and Massive Planets Correlated? (2006)

Moro-Martín, Amaya, Carpenter, John M., Meyer, Michael R., Hillenbrand, Lynne A., Malhotra, Renu, Hollenbach, David, ...

Using data from the Spitzer Space Telescope Legacy Science Program ``Formation and Evolution of Planetary Systems'' (FEPS), we have searched for debris disks around 9 FGK stars (2-10 Gyr), known from...

Evidence for Mass-dependent Circumstellar Disk Evolution in the 5 Myr-old Upper Scorpius OB Association (2006)

Carpenter, John M., Mamajek, Eric E., Hillenbrand, Lynne A., Meyer, Michael R.

We present 4.5, 8, and 16um photometry from the Spitzer Space Telescope for 204 stars in the Upper Scorpius OB Association. The data are used to investigate the frequency and properties of...

A Distributed Population of Low Mass Pre-Main Sequence Stars near the Taurus Molecular Clouds (2006)

Slesnick, Catherine L., Carpenter, John M., Hillenbrand, Lynne A., Mamajek, Eric E.

We present a drift scan survey covering a ~5 deg by 50 deg region toward the southern portion of the Taurus-Auriga molecular cloud. Data taken in the B,R,I filters with the Quest-2 camera on the...

Massive Protoplanetary Disks in the Trapezium Region (2006)

Eisner, J. A., Carpenter, John M.

(abridged) We determine the disk mass distribution around 336 stars in the young Orion Nebula cluster by imaging a 2.5' x 2.5' region in 3 mm continuum emission with the Owens Valley Millimeter...

The formation and evolution of planetary systems (FEPS): Discovery of an unusual debris system associated with HD 12039 (2006)

Hines, Dean C., Backman, Dana E., Bouwman, Jeroen, Hillenbrand, Lynne A., Carpenter, John M., Meyer, Michael R., ...

We report the discovery of a debris system associated with the ~30 Myr old G3/5V star HD 12039 using Spitzer Space Telescope observations from 3.6-160 mum. An observed infrared excess...

Constraining the Evolutionary Stage of Class I Protostars: Multi-wavelength Observations and Modeling (2005)

Eisner, J. A., Hillenbrand, L. A., Carpenter, John M., Wolf, S.

(abridged) We present new Keck images at 0.9 micron and OVRO 1.3 mm continuum images of five Class I protostars in the Taurus star forming region. We analyze these data in conjunction with broadband...

Formation and Evolution of Planetary Systems: Cold Outer Disks Associated with Sun-like stars (2005)

Kim, Jinyoung Serena, Hines, Dean C., Backman, Dana E., Hillenbrand, Lynne A., Meyer, Michael R., Rodmann, Jens, ...

We present the discovery of debris systems around three solar mass stars based upon observations performed with the Spitzer Space Telescope as part of a Legacy Science Program, ``the Formation and...

Evolution of cold circumstellar dust around solar-type stars (2005)

Carpenter, John M., Wolf, Sebastian, Schreyer, Katharina, Launhardt, Ralf, Henning, Thomas

We present submillimeter (Caltech Submillimeter Observatory 350 mum) and millimeter (Swedish-ESO Submillimetre Telescope [SEST] 1.2 mm, Owens Valley Radio Observatory [OVRO] 3 mm) photometry for 127...

Formation and evolution of planetary systems: Cold outer disks associated with sun-like stars (2005)

Kim, Jinyoung Serena, Hines, Dean C., Backman, Dana E., Hillenbrand, Lynne A., Meyer, Michael R., Rodmann, Jens, ...

We present the discovery of debris systems around three Sun-like stars based on observations performed with the Spitzer Space Telescope as part of a Legacy Science Program, ``The Formation and...

Constraining the evolutionary stage of class I protostars: Multiwavelength observations and modeling (2005)

Eisner, J. A., Hillenbrand, L. A., Carpenter, John M., Wolf, S.

We present new Keck images at 0.9 mum and OVRO 1.3 mm continuum images of five Class I protostars in the Taurus star-forming region. We analyze these data in conjunction with broadband spectral...

Evolution of Cold Circumstellar Dust Around Solar-Type Stars (2004)

Carpenter, John M., Wolf, Sebastian, Schreyer, Katharina, Launhardt, Ralf, Henning, Th.

We present submillimeter (CSO 350um) and millimeter (SEST 1.2 mm, OVRO 3 mm) photometry for 125 solar-type stars from the FEPS Spitzer Legacy program that have masses between ~0.5 and 2.0 Msun and...

The Spectroscopically Determined Substellar Mass Function of the Orion Nebula Cluster (2004)

Slesnick, Catherine L., Hillenbrand, Lynne A., Carpenter, John M.

We present a spectroscopic study of candidate brown dwarf members of the Orion Nebula Cluster (ONC). We obtained new J- and/or K-band spectra of ~100 objects within the ONC which are expected to be...

Detection of cool dust around the G2V star HD 107146 (2003)

Williams, Jonathan P., Najita, Joan, Liu, Michael C., Bottinelli, Sandrine, Carpenter, John M., Hillenbrand, Lynne A., ...

We report the detection of dust emission at sub-millimeter wavelengths from HD 107146, a G2V star with an age estimated to lie between 80 and 200 Myr. The emission is resolved at 450um with a size...

Distribution of Circumstellar Disk Masses in the Young Cluster NGC 2024 (2003)

Eisner, J. A., Carpenter, John M.

We determine the distribution of circumstellar disk masses in the young (~0.3 Myr) cluster NGC 2024 by imaging a 2.5'x2.5' region in 3mm continuum emission to an RMS noise level of ~0.75 mJy/beam...

2MASS Studies of Differential Reddening Across Three Massive Globular Clusters (2003)

Law, David R., Majewski, Steven R., Skrutskie, Michael F., Carpenter, John M., Ayub, Hina F.

J, H, and K_S band data from the Two Micron All-Sky Survey (2MASS) are used to study the effects of differential reddening across the three massive Galactic globular clusters Omega Centauri, NGC...

Constraints on the Circumstellar Disk Masses in the IC 348 Cluster (2002)

Carpenter, John M.

A 5.2' x 5.2' region toward the young cluster IC 348 has been imaged in the millimeter continuum at 4.0" x 4.9" resolution with the OVRO interferometer to a RMS noise level of 0.75 mJy/beam at 98...

Near-Infrared Photometric Variability of Stars Toward the Chamaeleon I Molecular Cloud (2002)

Carpenter, John M., Hillenbrand, Lynne A., Skrutskie, M. F., Meyer, Michael R.

We present the results of a J, H, and K_s photometric monitoring campaign of a 0.72 x 6 sq deg. area centered on the Chamaeleon I star forming region. Data were obtained on 15 separate nights over a...

Near-Infrared Photometric Variability of Stars Toward the Orion A Molecular Cloud (2001)

Carpenter, John M., Hillenbrand, Lynne A., Skrutskie, M. F.

We present an analysis of J, H, and K time series photometry obtained with the southern 2MASS telescope over a 0.84 x 6 deg^2 region centered near the Orion Nebula Cluster. These data are used to...

Color Transformations for the 2MASS Second Incremental Data Release (2001)

Carpenter, John M.

Transformation equations are presented to convert colors and magnitudes measured in the AAO, ARNICA, CIT, DENIS, ESO, LCO (Persson standards), MSSSO, SAAO, and UKIRT photometric systems to the...

The Orion Star-Forming Region (2000)

Hillenbrand, Lynne A., Carpenter, John M., Feigelson, Eric D.

General properties of the Orion star-forming region are discussed, with a focus on the dense Orion Nebula Cluster (ONC). This cluster contains between 2500 and 4500 objects located within a few...

Periodic Photometric Variability in the Becklin-Neugebauer Object (2000)

Hillenbrand, Lynne A., Carpenter, John M., Skrutskie, M. F.

The Becklin-Neugebauer (BN) object in the Orion Nebula Cluster (ONC) is a well-studied optically invisible, infrared-bright young stellar object, thought to be an intermediate-mass protostar. We...

2MASS Observations of the Perseus, Orion A, Orion B, and Monoceros R2 Molecular Clouds (2000)

Carpenter, John M.

We use the 2MASS Second Incremental Release Point Source Catalog to investigate the spatial distribution of young stars in the Perseus, Orion A, Orion B, and MonR2 molecular clouds. After subtracting...

Embedded Stellar Clusters in the W3/W4/W5 Molecular Cloud Complex (2000)

Carpenter, John M., Heyer, Mark H., Snell, Ronald L.

We analyze the embedded stellar content in the vicinity of the W3/W4/W5 HII regions using the FCRAO Outer Galaxy 12CO(J=1-0) Survey, the IRAS Point Source Catalog, published radio continuum surveys,...

Constraints on the Stellar/Sub-stellar Mass Function in the Inner Orion Nebula Cluster (2000)

Hillenbrand, Lynne A., Carpenter, John M.

We present the results of a 0.5-0.9" FWHM imaging survey at K (2.2 micron) and H (1.6 micron) covering 5.1' x 5.1' centered on Theta 1C Ori, the most massive star in the Orion Nebula Cluster (ONC)....

The Stellar Initial Mass Function: Constraints from Young Clusters and Theoretical Perspectives (1999)

Meyer, Michael R., Adams, Fred C., Hillenbrand, Lynne A., Carpenter, John M., Larson, Richard B.

We summarize recent observational and theoretical progress aimed at understanding the origin of the stellar initial mass function (IMF) with specific focus on galactic star-forming regions. We...

The W51 Giant Molecular Cloud (1998)

Carpenter, John M., Sanders, D. B.

We present 45"-47" angular resolution maps at 50" sampling of the 12CO and 13CO J=1-0 emission toward a 1.39 deg x 1.33 deg region in the W51 HII region complex. These data permit the spatial and...

Measurement of the delayed neutron fraction and correction of small angle scattering data from a pulsed spallation source (1990)

Epperson, J. E., Carpenter, John M., Thiyagarajan, P., Heuser, B.

The fraction of delayed neutrons in a moderated beam from the enriched uranium, pulsed spallation source at the intense pulsed neutron source at Argonne National Laboratory has been measured and...

Mixing of phases in non-crystalline materials: Application to carbon (1983)

Summerfield, G. C., Mildner, David Francis Raymond, Carpenter, John M.

The atomic structure of non-crystalline solids is described by the correlation function. When more than one phase is present, the simple addition of the correlation functions for the various phases...

A mechanical time-of-flight neutron diffractometer (1974)

Carpenter, John M., Mildner, David Francis Raymond, Pelizzari, Charles Arthur, Sutton, John David, Gunning, J. E.

A mechanical time-of-flight (TOF) neutron diffractometer has been constructed and a system of data analysis developed for the study of noncrystalline substances through radial density functions....

Equal-path time-of-flight neutron diffraction (1972)

Carpenter, John M., Sutton, John David

Measurements of the neutron diffraction patterns of liquids and non-crystalline solids with crystal spectrometer facilities and time-of-flight diffraction techniques are discussed. It is shown that...

Pulsed moderator studies using a time focused crystal spectrometer (1970)

Graham, K. F., Carpenter, John M.

A technique is reported for measuring the joint time and energy dependence of the rate of emission of slow neutrons emerging from moderators pulsed with fast neutrons. A crystal spectrometer selects...

Lattice vibrations of BeO (1967)

Brugger, R. M., Strong, K. A., Carpenter, John M.

Parts of the dispersion relations for BeO have been measured. These relations are for waves moving in the [100] direction with their polarization vectors in the (0001) plane. The initial slopes of...

A very-thin walled sample holder for liquids (1963)

Striffler, C. D., Carpenter, John M.

A sample holder for liquids is described which was developed for use in neutron scattering measurements. The design is very simple and inexpensive to fabricate, yet the walls of the container are...