Jenna Deaven - Academia.edu (original) (raw)

Papers by Jenna Deaven

Nuclear Data Sheets, 2014

Nuclear Data Sheets, 2014

Abstract The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration is devel... more Abstract The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration is developing a Time Projection Chamber (TPC) to measure neutron-induced fission cross sections with unprecedented accuracy. Modifying \{TPC\} technology for nuclear physics applications is a challenging endeavor, and frequent testing and evaluation is required to ensure that all components are behaving as expected. In-beam tests of the \{NIFFTE\} \{TPC\} at

Nuclear Data Sheets, 2014

Abstract A fission \{TPC\} is being developed to measure the energy-dependent neutron induced fis... more Abstract A fission \{TPC\} is being developed to measure the energy-dependent neutron induced fission cross sections of the major and minor actinides to an accuracy of better than 1%. Achieving such an accuracy will depend in part, on the ability of the \{TPC\} to provide precise tracking and identification of charged particles. A measurement of the α-decay to spontaneous fission

Nuclear Data Sheets, 2014

Abstract The \{NIFFTE\} collaboration has developed a time projection chamber to study neutron-in... more Abstract The \{NIFFTE\} collaboration has developed a time projection chamber to study neutron-induced fission events in actinide targets by tracking and identifying fission fragments in three dimensions as they traverse a gas volume. This paper will provide an overview of the analysis software that has been developed by the \{NIFFTE\} collaboration, as well as examples of its success in analyzing

Nuclear Data Sheets, 2014

Abstract When fully instrumented, the \{NIFFTE\} Time Projection Chamber will consist of nearly 6... more Abstract When fully instrumented, the \{NIFFTE\} Time Projection Chamber will consist of nearly 6000 channels, each of which requires a preamplifier, ADC, and digital readout. To minimize channel cost and size, the EtherDAQ data acquisition system utilizes off-the-shelf \{FPGA\} and Ethernet fiber technology. This application of commercially-available components made it possible to meet the requirements of the \{DAQ\} system with

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2014

The fission Time Projection Chamber (fissionTPC) is a compact (15 cm diameter) two-chamber MICROM... more The fission Time Projection Chamber (fissionTPC) is a compact (15 cm diameter) two-chamber MICROMEGAS TPC designed to make precision cross section measurements of neutron-induced fission. The actinide targets are placed on the central cathode and irradiated with a neutron beam that passes axially through the TPC inducing fission in the target. The 4π acceptance for fission fragments and complete charged particle track reconstruction are powerful features of the fissionTPC which will be used to measure fission cross sections and examine the associated systematic errors. This paper provides a detailed description of the design requirements, the design solutions, and the initial performance of the fissionTPC.

A low-energy neutron detector array is being developed for use in (p,n) charge-exchange experimen... more A low-energy neutron detector array is being developed for use in (p,n) charge-exchange experiments with radioactive beams. The array will consist of 25 plastic-scintillator bars that are capable of detecting neutrons with energies as low as approximately 200 keV. Since the kinematical reconstructing of a (p,n) reaction is performed using the energy and angle information from the neutron, accurate energy (measured by time-offlight) and angle resolutions are important. In the initial testing stage, a single scintillator bar is tested using Na and Cf sources. To reconstruct the kinematical information for each event, it is important to be able to accurately determine the position (and thus the angle) in which a particle strikes the array. Each unit of the array consists of a 30-cm long plastic scintillator bar and the energy deposited by particles in the detector is measured at the top and bottom using photomultiplier tubes. The hit position of the particle can then be obtained from t...

Bulletin of the American Physical Society, 2005

One way to determine the rho\rho rhoR (areal density) of IFC capsules is through tertiary-induced neu... more One way to determine the rho\rho rhoR (areal density) of IFC capsules is through tertiary-induced neutron activation of elements with appropriately high thresholds such as 65^{65}65Cu or 12^{12}12C. Since the tertiary neutron yield is many orders of magnitude lower than the ...

ABSTRACT Inertial Confinement Fusion (ICF) implosions can be characterized by the target areal de... more ABSTRACT Inertial Confinement Fusion (ICF) implosions can be characterized by the target areal density (rhoR). The rhoR of ICF targets in the National Ignition Facility (NIF) target chamber can be determined by tertiary-induced neutron activation of elements with appropriately high thresholds. In such materials as ^12C, neutron activation results in beta decay and the emission of 511-keV coincidences which are detected by a pair of NaI(Tl) detectors. Optimal diagnostic thickness, contamination effects, and detector response have been modeled using MCNPX. Results will be presented.

Bulletin of the American …, 2007

A low-energy neutron detector array is being developed for use in (p,n) charge-exchange experimen... more A low-energy neutron detector array is being developed for use in (p,n) charge-exchange experiments with radioactive beams. The array will consist of 25 plastic-scintillator bars that are capable of detecting neutrons with energies as low as approximately 200 keV. Since the kinematical ...

Inertial Confinement Fusion (ICF) implosions can be characterized by the target areal density (rh... more Inertial Confinement Fusion (ICF) implosions can be characterized by the target areal density (rhoR). The rhoR of ICF targets in the National Ignition Facility (NIF) target chamber can be determined by tertiary-induced neutron activation of elements with appropriately high thresholds. In such materials as ^12C, neutron activation results in beta decay and the emission of 511-keV coincidences which are detected by a pair of NaI(Tl) detectors. Optimal diagnostic thickness, contamination effects, and detector response have been modeled using MCNPX. Results will be presented.

Nuclear Data Sheets, 2014

Abstract The general properties needed in targets (sources) for high precision, high accuracy mea... more Abstract The general properties needed in targets (sources) for high precision, high accuracy measurements are reviewed. The application of these principles to the problem of developing targets for the Fission \{TPC\} is described. Longer term issues, such as the availability of actinide materials, improved knowledge of energy losses and straggling and the stability of targets during irradiation are also discussed.

Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014), 2015

Nuclear Data Sheets, 2014

Abstract The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration is devel... more Abstract The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration is developing a Time Projection Chamber (TPC) to measure neutron-induced fission cross sections with unprecedented accuracy. Modifying \{TPC\} technology for nuclear physics applications is a challenging endeavor, and frequent testing and evaluation is required to ensure that all components are behaving as expected. In-beam tests of the \{NIFFTE\} \{TPC\} at

Nuclear Data Sheets, 2014

Abstract A fission \{TPC\} is being developed to measure the energy-dependent neutron induced fis... more Abstract A fission \{TPC\} is being developed to measure the energy-dependent neutron induced fission cross sections of the major and minor actinides to an accuracy of better than 1%. Achieving such an accuracy will depend in part, on the ability of the \{TPC\} to provide precise tracking and identification of charged particles. A measurement of the α-decay to spontaneous fission

Physical Review C, 2015

ABSTRACT To study the Gamow-Teller (GT) transitions from the T z = +1 nucleus 42 Ca to the T z = ... more ABSTRACT To study the Gamow-Teller (GT) transitions from the T z = +1 nucleus 42 Ca to the T z = 0 nucleus 42 Sc, where T z is the z component of isospin T , we performed a (p,n)-type (3 He ,t) charge-exchange reaction at 140 MeV/nucleon and scattering angles around 0 •. With an energy resolution of 29 keV, states excited by GT transitions (GT states) could be studied accurately. The reduced GT transition strengths B(GT) were derived up to the excitation energy of 13 MeV, assuming the proportionality between the cross sections at 0 • and B(GT) values. The main part of the observed GT transition strength is concentrated in the lowest 0.611-MeV, J π = 1 + GT state. All the other states at higher energies are weakly excited. Shell-model calculations could reproduce the gross feature of the experimental B(GT) distribution, and random-phase-approximation calculations including an attractive isoscalar interaction showed that the 0.611-MeV state has a collective nature. It was found that this state has all of the properties of a " low-energy super-Gamow-Teller state. " It is expected that low-lying J π = 1 + GT states have T = 0 in the T z = 0 nucleus 42 Sc. However, T = 1 states are situated in a higher energy region. Assuming an isospin-analogous structure in A = 42 isobars, analogous T = 1, 1

Nuclear Data Sheets, 2014

Nuclear Data Sheets, 2014

Abstract The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration is devel... more Abstract The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration is developing a Time Projection Chamber (TPC) to measure neutron-induced fission cross sections with unprecedented accuracy. Modifying \{TPC\} technology for nuclear physics applications is a challenging endeavor, and frequent testing and evaluation is required to ensure that all components are behaving as expected. In-beam tests of the \{NIFFTE\} \{TPC\} at

Nuclear Data Sheets, 2014

Abstract A fission \{TPC\} is being developed to measure the energy-dependent neutron induced fis... more Abstract A fission \{TPC\} is being developed to measure the energy-dependent neutron induced fission cross sections of the major and minor actinides to an accuracy of better than 1%. Achieving such an accuracy will depend in part, on the ability of the \{TPC\} to provide precise tracking and identification of charged particles. A measurement of the α-decay to spontaneous fission

Nuclear Data Sheets, 2014

Abstract The \{NIFFTE\} collaboration has developed a time projection chamber to study neutron-in... more Abstract The \{NIFFTE\} collaboration has developed a time projection chamber to study neutron-induced fission events in actinide targets by tracking and identifying fission fragments in three dimensions as they traverse a gas volume. This paper will provide an overview of the analysis software that has been developed by the \{NIFFTE\} collaboration, as well as examples of its success in analyzing

Nuclear Data Sheets, 2014

Abstract When fully instrumented, the \{NIFFTE\} Time Projection Chamber will consist of nearly 6... more Abstract When fully instrumented, the \{NIFFTE\} Time Projection Chamber will consist of nearly 6000 channels, each of which requires a preamplifier, ADC, and digital readout. To minimize channel cost and size, the EtherDAQ data acquisition system utilizes off-the-shelf \{FPGA\} and Ethernet fiber technology. This application of commercially-available components made it possible to meet the requirements of the \{DAQ\} system with

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2014

The fission Time Projection Chamber (fissionTPC) is a compact (15 cm diameter) two-chamber MICROM... more The fission Time Projection Chamber (fissionTPC) is a compact (15 cm diameter) two-chamber MICROMEGAS TPC designed to make precision cross section measurements of neutron-induced fission. The actinide targets are placed on the central cathode and irradiated with a neutron beam that passes axially through the TPC inducing fission in the target. The 4π acceptance for fission fragments and complete charged particle track reconstruction are powerful features of the fissionTPC which will be used to measure fission cross sections and examine the associated systematic errors. This paper provides a detailed description of the design requirements, the design solutions, and the initial performance of the fissionTPC.

A low-energy neutron detector array is being developed for use in (p,n) charge-exchange experimen... more A low-energy neutron detector array is being developed for use in (p,n) charge-exchange experiments with radioactive beams. The array will consist of 25 plastic-scintillator bars that are capable of detecting neutrons with energies as low as approximately 200 keV. Since the kinematical reconstructing of a (p,n) reaction is performed using the energy and angle information from the neutron, accurate energy (measured by time-offlight) and angle resolutions are important. In the initial testing stage, a single scintillator bar is tested using Na and Cf sources. To reconstruct the kinematical information for each event, it is important to be able to accurately determine the position (and thus the angle) in which a particle strikes the array. Each unit of the array consists of a 30-cm long plastic scintillator bar and the energy deposited by particles in the detector is measured at the top and bottom using photomultiplier tubes. The hit position of the particle can then be obtained from t...

Bulletin of the American Physical Society, 2005

One way to determine the rho\rho rhoR (areal density) of IFC capsules is through tertiary-induced neu... more One way to determine the rho\rho rhoR (areal density) of IFC capsules is through tertiary-induced neutron activation of elements with appropriately high thresholds such as 65^{65}65Cu or 12^{12}12C. Since the tertiary neutron yield is many orders of magnitude lower than the ...

ABSTRACT Inertial Confinement Fusion (ICF) implosions can be characterized by the target areal de... more ABSTRACT Inertial Confinement Fusion (ICF) implosions can be characterized by the target areal density (rhoR). The rhoR of ICF targets in the National Ignition Facility (NIF) target chamber can be determined by tertiary-induced neutron activation of elements with appropriately high thresholds. In such materials as ^12C, neutron activation results in beta decay and the emission of 511-keV coincidences which are detected by a pair of NaI(Tl) detectors. Optimal diagnostic thickness, contamination effects, and detector response have been modeled using MCNPX. Results will be presented.

Bulletin of the American …, 2007

A low-energy neutron detector array is being developed for use in (p,n) charge-exchange experimen... more A low-energy neutron detector array is being developed for use in (p,n) charge-exchange experiments with radioactive beams. The array will consist of 25 plastic-scintillator bars that are capable of detecting neutrons with energies as low as approximately 200 keV. Since the kinematical ...

Inertial Confinement Fusion (ICF) implosions can be characterized by the target areal density (rh... more Inertial Confinement Fusion (ICF) implosions can be characterized by the target areal density (rhoR). The rhoR of ICF targets in the National Ignition Facility (NIF) target chamber can be determined by tertiary-induced neutron activation of elements with appropriately high thresholds. In such materials as ^12C, neutron activation results in beta decay and the emission of 511-keV coincidences which are detected by a pair of NaI(Tl) detectors. Optimal diagnostic thickness, contamination effects, and detector response have been modeled using MCNPX. Results will be presented.

Nuclear Data Sheets, 2014

Abstract The general properties needed in targets (sources) for high precision, high accuracy mea... more Abstract The general properties needed in targets (sources) for high precision, high accuracy measurements are reviewed. The application of these principles to the problem of developing targets for the Fission \{TPC\} is described. Longer term issues, such as the availability of actinide materials, improved knowledge of energy losses and straggling and the stability of targets during irradiation are also discussed.

Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014), 2015

Nuclear Data Sheets, 2014

Abstract The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration is devel... more Abstract The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration is developing a Time Projection Chamber (TPC) to measure neutron-induced fission cross sections with unprecedented accuracy. Modifying \{TPC\} technology for nuclear physics applications is a challenging endeavor, and frequent testing and evaluation is required to ensure that all components are behaving as expected. In-beam tests of the \{NIFFTE\} \{TPC\} at

Nuclear Data Sheets, 2014

Abstract A fission \{TPC\} is being developed to measure the energy-dependent neutron induced fis... more Abstract A fission \{TPC\} is being developed to measure the energy-dependent neutron induced fission cross sections of the major and minor actinides to an accuracy of better than 1%. Achieving such an accuracy will depend in part, on the ability of the \{TPC\} to provide precise tracking and identification of charged particles. A measurement of the α-decay to spontaneous fission

Physical Review C, 2015

ABSTRACT To study the Gamow-Teller (GT) transitions from the T z = +1 nucleus 42 Ca to the T z = ... more ABSTRACT To study the Gamow-Teller (GT) transitions from the T z = +1 nucleus 42 Ca to the T z = 0 nucleus 42 Sc, where T z is the z component of isospin T , we performed a (p,n)-type (3 He ,t) charge-exchange reaction at 140 MeV/nucleon and scattering angles around 0 •. With an energy resolution of 29 keV, states excited by GT transitions (GT states) could be studied accurately. The reduced GT transition strengths B(GT) were derived up to the excitation energy of 13 MeV, assuming the proportionality between the cross sections at 0 • and B(GT) values. The main part of the observed GT transition strength is concentrated in the lowest 0.611-MeV, J π = 1 + GT state. All the other states at higher energies are weakly excited. Shell-model calculations could reproduce the gross feature of the experimental B(GT) distribution, and random-phase-approximation calculations including an attractive isoscalar interaction showed that the 0.611-MeV state has a collective nature. It was found that this state has all of the properties of a " low-energy super-Gamow-Teller state. " It is expected that low-lying J π = 1 + GT states have T = 0 in the T z = 0 nucleus 42 Sc. However, T = 1 states are situated in a higher energy region. Assuming an isospin-analogous structure in A = 42 isobars, analogous T = 1, 1