Direct Reaction Measurements Using GODDESS

Pain, S. D.; Ratkiewicz, A.; Baugher, T.; Febbraro, M.; Lepailleur, A.; Ayangeakaa, A. D.; Allen, J.; Anderson, J.; Bardayan, D. W.; Blackmon, J. C.; Blanchard, Romain; Burcher, S.; Carpenter, M. P.; M., S.; Chae, K. Y.; Chipps, K. A.; Cizewski, J. A.; Engelhardt, A.; Garland, Heather; Jones, K. L.; Kozub, R. L.; Lee, E. J.; Hall, M. R.; Hall, O.; Hu, Jiliang; O’Malley, P. D.; Marsh, I.; Rasco, B. C.; Santiago-Gonzales, D.; Seweryniak, D.; Shadrick, S.C.; Sims, Howard E.; Smith, K.; Smith, M. S.; Tai, Pei-Luan; Thompson, P.; Thornsberry, C.; Varner, R. L.; Walter, D.; Wilson, G. L.

doi:10.1016/j.phpro.2017.09.051

Cited by 19 publications

(94 citation statements)

References 6 publications

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“…The commissioning experiment exploited 134 Xe beams with ≈1 mg/cm 2 CD 2 targets to measure excitations in 135 Xe including candidates for 2f7/2 and 3p3/2 excitations above the N=82 shell gap. Preliminary results have been reported [13] and show gamma-ray events in coincidence with protons well above the neutron separation energy, the surrogate (n,n'γ) excitation region. ORRUBA can also be coupled to GRETINA [15] and a new LaBr3(Ce)-based Hybrid Array of Gamma-Ray Detectors (HAGRiD) currently being developed under the leadership of the University of Tennessee [16].…”

Section: Developing Techniques To Measure (Dpγ) Reactions With Ribsmentioning

confidence: 91%

“…We are part of the Gammasphere ORRUBA: Dual Detectors for Experimental Structure Studies (GODDESS) collaboration [13] that has developed the techniques to couple the Oak Ridge Rutgers University Barrel Array (ORRUBA) of position-sensitive silicon strip detectors [14] to the Gammasphere array of up to 110 Compton-suppressed HPGe detectors at the ATLAS accelerator at Argonne National Laboratory. The commissioning experiment exploited 134 Xe beams with ≈1 mg/cm 2 CD 2 targets to measure excitations in 135 Xe including candidates for 2f7/2 and 3p3/2 excitations above the N=82 shell gap.…”

Section: Developing Techniques To Measure (Dpγ) Reactions With Ribsmentioning

confidence: 99%

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Neutron capture on short-lived nuclei via the surrogate (d,pγ) reaction

Cizewski

Ratkiewicz

2018

EPJ Web Conf.

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Abstract. Rapid r-process nucleosynthesis is responsible for the creation of about half of the elements heavier than iron. Neutron capture on shortlived nuclei in cold processes or during freeze out from hot processes can have a significant impact on the final observed r-process abundances. We are validating the (d,pγ) reaction as a surrogate for neutron capture with measurements on 95 Mo targets and a focus on discrete transitions. The experimental results have been analyzed within the Hauser-Feshbach approach with non-elastic breakup of the deuteron providing a neutron to be captured. Preliminary results support the (d,pγ) reaction as a valid surrogate for neutron capture. We are poised to measure the (d,pγ) reaction in inverse kinematics with unstable beams following the development of the experimental techniques.

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Section: Developing Techniques To Measure (Dpγ) Reactions With Ribsmentioning

confidence: 91%

Section: Developing Techniques To Measure (Dpγ) Reactions With Ribsmentioning

confidence: 99%

Neutron capture on short-lived nuclei via the surrogate (d,pγ) reaction

Cizewski

Ratkiewicz

2018

EPJ Web Conf.

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“…13 (top) in the under-depleted case (80 V) with the condition that the multiplicity is equal to 1. The signal from the protons, deuterons and tritons on one side and from 4 He and then Li isotopes on the other side align on an almost parabolic shape. The punchthroughs of the protons, deuterons, tritons appear as a straight line and are mixed up.…”

Section: Pulse Shape Discrimination and Effect Of Strip Lengthmentioning

confidence: 97%

“…The measurement of the light ejectiles only will not be sufficient to identify the populated states and coupling with gamma-rays detectors will be crucial. This is the reason for which the new generation of Silicon arrays like GODDESS [4], T-REX [5] and GRIT [6] are designed to be coupled with state-of-the-art gamma arrays.…”

Section: Introductionmentioning

confidence: 99%

Pulse shape discrimination for GRIT: beam test of a new integrated charge and current preamplifier coupled with high granularity Silicon detectors

Dormard¹,

Assié²,

Grassi³

et al. 2021

Preprint

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The GRIT (Granularity, Resolution, Identification, Transparency) Silicon array is intended to measure direct reactions. Its design is based on several layers (three layers in the forward direction, two backward) of custom-made trapezoidal and square detectors. The first stage is 500 µm thick and features 128×128 orthogonal strips. Pulse shape analysis for particle identification is implemented for this first layer. Given the compacity of this array and the large number of channels involved (>7,500), an integrated preamplifier, iPACI, that gives charge and current information has been developed in the AMS 0.35 µm BiCMOS technology. The design specifications and results of the test bench are presented. Considering an energy range of 50 MeV and an energy resolution (FWHM) of 12 keV (FWHM) for the preamplifier, the energy resolution for one strip obtained from alpha source measurement in real conditions is 35 keV. The current output bandwidth is measured at 130 MHz for small signals and the power consumption reaches 40 mW per detector channel. A first beam test was performed coupling a nTD trapezoidal double-sided stripped Silicon detector of GRIT with the iPACI preamplifier and a 64-channel digitizer. Z=1 particles are discriminated with pulse shape analysis technique down to 2 MeV for protons, 2.5 MeV for deuterons and 3 MeV for tritons. The effect of the strip length due to the

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“…To realize (d, pγ) reaction studies with radioactive ion beams, the Gammasphere ORRUBA: Dual Detectors for Experimental Structure Studies (GODDESS) [299] was commissioned with the Oak Ridge Rutgers University Barrel Array (ORRUBA) of position-sensitive silicon strip detectors augmented with annular arrays of end cap detectors. Preliminary results [300] with the N=80 134 Xe beam showed population of a candidate for the 3p 3/2 3/2 − state important for DSD capture and the gamma-decay probability data at high excitation energy that would be needed for a surrogate (n, γ) analysis, should statistics be sufficient.…”

Section: Recent and Planned Experiments With Radioactive Ionsmentioning

confidence: 99%

FRIB and the GW170817 Kilonova

Aprahamian,

Surman,

Frebel

et al. 2018

Preprint

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In July 2018 an FRIB Theory Alliance program was held on the implications of GW170817 and its associated kilonova for r-process nucleosynthesis. Topics of discussion included the astrophysical and nuclear physics uncertainties in the interpretation of the GW170817 kilonova, what we can learn about the astrophysical site or sites of the r process from this event, and the advances in nuclear experiment and theory most crucial to pursue in light of the new data. Here we compile a selection of scientific contributions to the workshop, broadly representative of progress in r-process studies since the GW170817 event.

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Direct Reaction Measurements Using GODDESS

Cited by 19 publications

References 6 publications

Neutron capture on short-lived nuclei via the surrogate (d,pγ) reaction

Neutron capture on short-lived nuclei via the surrogate (d,pγ) reaction

Pulse shape discrimination for GRIT: beam test of a new integrated charge and current preamplifier coupled with high granularity Silicon detectors

FRIB and the GW170817 Kilonova

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