G. Christian
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Research Interests
G. Christian has a total of 107 co-authors. Here are the top co-authors by number of shared publications:
- Chris Ruiz
TRIUMF
3 shared publications G. Lotay
3 shared publicationsA. Katrusiak
2 shared publicationsA. Lennarz
2 shared publicationsA. Saastamoinen
Texas A&M University
2 shared publications- Annika Lennarz
TRIUMF
2 shared publications
Latest Publications
- Open Access
- 3 November 2026
- Published by Elsevier in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- Vol. 1095
DEMAND: An organic glass scintillator array for direct measurements of (α,n) and (p,n) reactions in inverse kinematics
- 3 November 2026
- Published by Elsevier in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- Vol. 1095
Open AccessDEMAND: An organic glass scintillator array for direct measurements of (α,n) and (p,n) reactions in inverse kinematics
- Open Access
- 20 February 2026
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 999 (1)
Direct Measurement of 59 Cu( p , α ) 56 Ni Precludes a Strong NiCu Cycle in Type-I X-Ray Bursts
Model-observation comparisons of type-I X-ray bursts (XRBs) can reveal the properties of accreting neutron star systems, including the neutron star compactness. XRBs are powered by nuclear burning, and a handful of reactions have been shown to impact the model results. Reactions in the NiCu cycles, featuring a competition between 59 Cu( p , γ ) 60 Zn and 59 Cu( p , α ) 56 Ni, have been shown to be among the most important reactions as they are a critical checkpoint in rp -process flow and significantly impact the light curves and burst ashes. We report a direct measurement of 59 Cu( p , α ) 56 Ni, bringing stringent constraints on this reaction rate. New results rule out a strong NiCu cycle in XRBs, with a negligible degree of recycling, ≤5% up to 1.5 GK. The new reaction rate, when varied within new uncertainty limits, shows no impact on one-zone XRB model light curves tailored for clocked-burster GS1826–24 , hence removing an important nuclear physics uncertainty in the model-observation comparison.
- 20 February 2026
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 999 (1)
Open AccessDirect Measurement of 59 Cu( p , α ) 56 Ni Precludes a Strong NiCu Cycle in Type-I X-Ray Bursts
Model-observation comparisons of type-I X-ray bursts (XRBs) can reveal the properties of accreting neutron star systems, including the neutron star compactness. XRBs are powered by nuclear burning, and a handful of reactions have been shown to impact the model results. Reactions in the NiCu cycles, featuring a competition between 59 Cu( p , γ ) 60 Zn and 59 Cu( p , α ) 56 Ni, have been shown to be among the most important reactions as they are a critical checkpoint in rp -process flow and significantly impact the light curves and burst ashes. We report a direct measurement of 59 Cu( p , α ) 56 Ni, bringing stringent constraints on this reaction rate. New results rule out a strong NiCu cycle in XRBs, with a negligible degree of recycling, ≤5% up to 1.5 GK. The new reaction rate, when varied within new uncertainty limits, shows no impact on one-zone XRB model light curves tailored for clocked-burster GS1826–24 , hence removing an important nuclear physics uncertainty in the model-observation comparison.
- 28 May 2025
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 134 (21) , 212501
Experimental Test of the Ratio Method for Nuclear-Reaction Analysis
Nuclear halos are exotic quantal structures observed far from stability. They are mostly studied through reactions. The ratio of angular cross sections for breakup and scattering is predicted to be independent of the reaction process and to be very sensitive to the halo structure. We test this new observable experimentally for the first time on the collision of ^{11}Be on C at 22.8 MeV/nucleon and using existing data on Pb at 19.1 MeV/nucleon. The theoretical predictions are verified, which offers the possibility of developing a new spectroscopic tool to study nuclear structure far from stability.
- 28 May 2025
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 134 (21) , 212501
Experimental Test of the Ratio Method for Nuclear-Reaction Analysis
Nuclear halos are exotic quantal structures observed far from stability. They are mostly studied through reactions. The ratio of angular cross sections for breakup and scattering is predicted to be independent of the reaction process and to be very sensitive to the halo structure. We test this new observable experimentally for the first time on the collision of ^{11}Be on C at 22.8 MeV/nucleon and using existing data on Pb at 19.1 MeV/nucleon. The theoretical predictions are verified, which offers the possibility of developing a new spectroscopic tool to study nuclear structure far from stability.
- Open Access
- 6 January 2025
- Published by Elsevier in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- Vol. 1072
First in-beam demonstration of a hybrid LaBr/CeBr/BGO array to measure radiative capture resonance energies in an extended gas target using a novel time of flight technique- 6 January 2025
- Published by Elsevier in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- Vol. 1072
Open AccessFirst in-beam demonstration of a hybrid LaBr/CeBr/BGO array to measure radiative capture resonance energies in an extended gas target using a novel time of flight technique - 20 November 2023
- Published by Elsevier in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- Vol. 1059
BlueSTEAl: A pair of silicon arrays and a zero-degree phoswich detector for studies of scattering and reactions in inverse kinematics
- 20 November 2023
- Published by Elsevier in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- Vol. 1059
BlueSTEAl: A pair of silicon arrays and a zero-degree phoswich detector for studies of scattering and reactions in inverse kinematics
- 27 January 2022
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 128 (4) , 042701
Radiative Capture on Nuclear Isomers: Direct Measurement of the ReactionWe present the first direct measurement of an astrophysical reaction using a radioactive beam of isomeric nuclei. In particular, we have measured the strength of the key 447-keV resonance in the reaction to be and find that this resonance dominates the thermally averaged reaction rate for temperatures between 0.3 and 2.5 GK. This work represents a critical development in resolving one of the longest standing issues in nuclear astrophysics research, relating to the measurement of proton capture reactions on excited quantum levels, and offers unique insight into the destruction of isomeric in astrophysical plasmas.- 27 January 2022
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 128 (4) , 042701
Radiative Capture on Nuclear Isomers: Direct Measurement of the ReactionWe present the first direct measurement of an astrophysical reaction using a radioactive beam of isomeric nuclei. In particular, we have measured the strength of the key 447-keV resonance in the reaction to be and find that this resonance dominates the thermally averaged reaction rate for temperatures between 0.3 and 2.5 GK. This work represents a critical development in resolving one of the longest standing issues in nuclear astrophysics research, relating to the measurement of proton capture reactions on excited quantum levels, and offers unique insight into the destruction of isomeric in astrophysical plasmas.- Open Access
- 12 October 2011
- Published by American Physical Society (APS) in Physical Review C
- Vol. 84 (4) , 044309
Search for theBe ground stateA two-proton knockout reaction from a C beam at 55 MeV/u was used to produce the unbound nucleus Be. No significant number of events were observed for the decay of Be into a neutron and a Be fragment. An upper limit for the Be production cross section of 0.0790.038 mb was extracted, which is more than an order of magnitude smaller than the predicted two-proton knockout reaction cross section. Based on these results we conclude that any populated states in Be decay through three sequential neutron decays into Be, via the unbound first excited state of Be. Therefore, these states in Be must be neutron unbound by more than 1.54 MeV, which is the location of the first excited 2 state in Be.- 12 October 2011
- Published by American Physical Society (APS) in Physical Review C
- Vol. 84 (4) , 044309
Open AccessSearch for theBe ground stateA two-proton knockout reaction from a C beam at 55 MeV/u was used to produce the unbound nucleus Be. No significant number of events were observed for the decay of Be into a neutron and a Be fragment. An upper limit for the Be production cross section of 0.0790.038 mb was extracted, which is more than an order of magnitude smaller than the predicted two-proton knockout reaction cross section. Based on these results we conclude that any populated states in Be decay through three sequential neutron decays into Be, via the unbound first excited state of Be. Therefore, these states in Be must be neutron unbound by more than 1.54 MeV, which is the location of the first excited 2 state in Be.