A digital data acquisition system for the detectors at gammasphere

Anderson, J.; David, H. M.; Alcorta, M.; Campbell, C. M.; Carpenter, M. P.; Chiara, C. J.; Cromaz, M.; Doering, D.; Doherty, D. T.; Hoffman, C. R.; Janssens, R. V. F.; Joseph, J.; Khoo, T. L.; Kreps, A.; Lauritsen, T.; Lee, I. Y.; Lionberger, C.; Lister, C. J.; Madden, Tim; Oberling, M.; Rogers, A. M.; Seweryniak, D.; Wilt, P.; Zimmermann, S.

doi:10.1109/nssmic.2012.6551368

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…246 Fm [367] or 256 Rf studies [167]. Similarly, the 'Digital Gammasphere' project at ANL aims at the implementation of digital electronics, based on GRETINA developments [368].…”

Section: Prompt Spectroscopy Techniquesmentioning

confidence: 99%

Nuclear structure features of very heavy and superheavy nuclei—tracing quantum mechanics towards the ‘island of stability’

Ackermann

Theisen

2017

Phys. Scr.

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The quantum-mechanic nature of nuclear matter is at the origin of the vision of a region of enhanced stability at the upper right end of the chart of nuclei, the so-called ‘island of stability’. Since the 1960s in the early second half of the last century, various models predict closed shells for proton numbers 114–126 and neutron numbers such as 172 or 184. Being stabilized by quantum-mechanic effects only, those extremely heavy man-made nuclear species are an ideal laboratory to study the origin of the strong nuclear interaction which is the driving force for matter properties in many fields ranging from microscopic scales like hadronic systems to cosmic scales in stellar environments like neutron stars. Since the 1950s, experiments on the synthesis of new elements and isotopes have also revealed various exciting nuclear structure features. The contribution of Bohr, Mottelson and Rainwater with, in particular, the development of the unified model played an essential role in this context. Although not anticipated in the region of the heaviest nuclei, many phenomena were subsequently discovered like the interplay of collective features manifesting themselves e.g. in nuclear deformation, ranging from spherical to prolate and oblate shapes with the possible occurrence of triaxial symmetries, and single particle states and their excitation into quasiparticle configurations. The continuous development of modern experimental techniques employing advanced detection set-ups was essential to reveal these exciting nuclear structure aspects in the actinide and transactinide regions since the production cross-section becomes extremely small with increasing mass and charge. Further technological progress, in particular, high intensity stable ion beam accelerator facilities presently under construction, as well as potentially in the farther future radioactive neutron rich ion beams provide a high discovery potential for the basic understanding of nuclear matter.

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“…246 Fm [367] or 256 Rf studies [167]. Similarly, the 'Digital Gammasphere' project at ANL aims at the implementation of digital electronics, based on GRETINA developments [368].…”

Section: Prompt Spectroscopy Techniquesmentioning

confidence: 99%

Nuclear structure features of very heavy and superheavy nuclei—tracing quantum mechanics towards the ‘island of stability’

Ackermann

Theisen

2017

Phys. Scr.

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“…A minimum of three γ -rays within a 2-μ s coincidence window was required for events to be recorded to disk, although a narrower, sub-microsecond coincidence constraint was imposed in the offline analysis. We operated the array with a digital data acquisition system (Digital Gammasphere 18 ) at average event rates of 40-50 kHz. We collected data for about 62 h in this configuration.…”

mentioning

confidence: 99%

Isomer depletion as experimental evidence of nuclear excitation by electron capture

Chiara

Carroll

Carpenter

et al. 2018

Nature

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The atomic nucleus and its electrons are often thought of as independent systems that are held together in the atom by their mutual attraction. Their interaction, however, leads to other important effects, such as providing an additional decay mode for excited nuclear states, whereby the nucleus releases energy by ejecting an atomic electron instead of by emitting a γ-ray. This 'internal conversion' has been known for about a hundred years and can be used to study nuclei and their interaction with their electrons. In the inverse process-nuclear excitation by electron capture (NEEC)-a free electron is captured into an atomic vacancy and can excite the nucleus to a higher-energy state, provided that the kinetic energy of the free electron plus the magnitude of its binding energy once captured matches the nuclear energy difference between the two states. NEEC was predicted in 1976 and has not hitherto been observed. Here we report evidence of NEEC in molybdenum-93 and determine the probability and cross-section for the process in a beam-based experimental scenario. Our results provide a standard for the assessment of theoretical models relevant to NEEC, which predict cross-sections that span many orders of magnitude. The greatest practical effect of the NEEC process may be on the survival of nuclei in stellar environments, in which it could excite isomers (that is, long-lived nuclear states) to shorter-lived states. Such excitations may reduce the abundance of the isotope after its production. This is an example of 'isomer depletion', which has been investigated previously through other reactions, but is used here to obtain evidence for NEEC.

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“…With the development of high-speed and high-precision ADCs, waveform digitization becomes a better choice to improve the ability to capture precise waveform information and the flexibility of data processing and analyzing. In the next generation of the Gammasphere, a digital data acquisition system is adopted to increase data throughput and event rates [8]. The data acquisition system adopts 14-bit and 100 MSample/s waveform digitizers and constructs a synchronization, trigger, and control network with high-speed serial links.…”

Section: Introductionmentioning

confidence: 99%

Prototype of readout electronics for GAEA gamma spectrometer of Back-n facility at CSNS

Xie¹,

Cao²,

Yu³

et al. 2022

J. Inst.

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The back-streaming neutrons (Back-n) facility at China Spallation Neutron Source (CSNS) provides an excellent white neutron source for accurate nuclear data measurements. At Back-n, the GAmma spectrometer with GErmanium Array (GAEA) in planning is designed to measure neutron-induced cross-sections, nuclear structure, and in-beam nuclear spectroscopy. As GAEA consists of various detectors, developing and maintaining the readout electronics for this spectrometer is challenging. A prototype of readout electronics based on the universal digital readout platform is proposed in this paper. The digitizer in the platform consists of a data processing carrier and a signal acquire mezzanine. Different mezzanines are designed to accommodate various detectors in GAEA. The carrier's firmware also has a universal part for data readout and a reconfigurable module for real-time data processing. In order to synchronize all digitizers, a time synchronization module is designed, based upon which a global synchronous network is constructed with PXIe chassis. Critical signals as the clock, trigger, and control can be synchronously distributed over this network with high precision, significantly simplifying the whole readout electronics. Several tests were carried out to evaluate the prototype. The measured FWHM of the 22Na characteristic peak at 1274.5 keV is better than 0.15% for the HPGe detector. The measured time resolution of the readout electronics is 34.7 ps. Test results show that the performance of the readout electronics can meet GAEA requirements.

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A digital data acquisition system for the detectors at gammasphere

Cited by 6 publications

References 7 publications

Nuclear structure features of very heavy and superheavy nuclei—tracing quantum mechanics towards the ‘island of stability’

Nuclear structure features of very heavy and superheavy nuclei—tracing quantum mechanics towards the ‘island of stability’

Isomer depletion as experimental evidence of nuclear excitation by electron capture

Prototype of readout electronics for GAEA gamma spectrometer of Back-n facility at CSNS

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