B. Davids

Direct measurement of resonances in $^{7}$ Be( $I^\pm, I^^{3}$ ) $^{11}$ C relevant to $I^½ p$ -process nucleosynthesis

A. Psaltis, A. A. Chen, R. Longland +18

We have performed the first direct measurement of two resonances of the $^{7}$ Be( $I^\pm, I^^{3}$ ) $^{11}$ C reaction with unknown strengths using an intense radioactive $^{7}$ Be beam and the DRA…

Proton-decaying states in 22Mg and the nucleosynthesis of 22Na in novae

B. Davids, J. P. M. Beijers, A. M. van den Berg +9

Populating states in 22Mg via the (p,t) reaction in inverse kinematics with a 55 MeV/nucleon 24Mg beam, we have measured the proton-decay branching ratios of the levels at 5.96 MeV…

physics.ins-det2018

The GRIFFIN Facility for Decay-Spectroscopy Studies at TRIUMF-ISAC

A. B. Garnsworthy, C. E. Svensson, M. Bowry +101

Gamma-Ray Infrastructure For Fundamental Investigations of Nuclei, GRIFFIN, is a new high-efficiency $I^^{3}$ -ray spectrometer designed for use in decay spectroscopy experiments with l…

astro-ph.SR2025

Solar fusion III: New data and theory for hydrogen-burning stars

B. Acharya, M. Aliotta, A. B. Balantekin +47

In stars that lie on the main sequence in the Hertzsprung-Russel diagram, like our sun, hydrogen is fused to helium in a number of nuclear reaction chains and series, such as the p…

nucl-ex2012

Measurement of the 18Ne(a,p_0)21Na reaction cross section in the burning energy region for X-ray bursts

P. J. C. Salter, M. Aliotta, T. Davinson +14

The 18Ne(a,p)21Na reaction provides one of the main HCNO-breakout routes into the rp-process in X-ray bursts. The 18Ne(a,p_0)21Na reaction cross section has been determined for the…

astro-ph.SR2013

Constraining nova observables: direct measurements of resonance strengths in 33S(p,Î³)34Cl

J. Fallis, A. Parikh, P. F. Bertone +32

The 33S(p,Î³)34Cl reaction is important for constraining predictions of certain isotopic abundances in oxygen-neon novae. Models currently predict as much as 150 times the solar ab…

Single neutron transfer on 23Ne and its relevance forthepathway ofnucleosynthesis in astrophysical X-ray bursts

G. Lotay, J. Henderson, W. N. Catford +32

We present new experimental measurements of resonance strengths in the astrophysical 23Al(p, Î³)24Si reaction, constraining the pathway of nucleosynthesis beyond 22Mg in X-ray burs…

physics.ins-det2019

Initial operation of the recoil mass spectrometer EMMA at the ISAC-II facility of TRIUMF

B. Davids, M. Williams, N. E. Esker +8

The Electromagnetic Mass Analyser (EMMA) is a new vacuum-mode recoil mass spectrometer currently undergoing the final stages of commissioning at the ISAC-II facility of TRIUMF. EMM…

The astrophysical rate of 15O(alpha,gamma)19Ne via the (p,t) reaction in inverse kinematics

B. Davids, A. M. van den Berg, P. Dendooven +11

A recoil coincidence technique has been applied to measure the alpha-decay branching ratios of near-threshold states in 19Ne. Populating these states using the (p,t) reaction in in…

nucl-ex2008

Gamow-Teller strengths in 24Na using the 24Mg(t,3He) reaction at 115 AMeV

M. E. Howard, R. G. T. Zegers, Sam M. Austin +16

Gamow-Teller transitions from 24Mg to 24Na were studied via the (t,3He) reaction at 115 AMeV using a secondary triton beam produced via fast fragmentation of 150 AMeV 16O ions. Com…

The astrophysical rate of 15O(alpha,gamma)19Ne via recoil-decay tagging and its implications for nova nucleosynthesis

B. Davids, J. Jose

The 15O(alpha,gamma)19Ne reaction is one of two known routes for breakout from the hot CNO cycles into the rp process. Its astrophysical rate depends on the decay properties of exc…

Elastic scattering of 3He+4He with SONIK

S. N. Paneru, C. R. Brune, D. Connolly +22

Measurements of the elastic scattering cross section of 3He and 4He are important in order to improve constraints on theoretical models of 4He(3He,g)7Be, a key reaction in Big Bang…

nucl-ex2010

Solar fusion cross sections II: the pp chain and CNO cycles

E. G. Adelberger, A. B. Balantekin, D. Bemmerer +45

We summarize and critically evaluate the available data on nuclear fusion cross sections important to energy generation in the Sun and other hydrogen-burning stars and to solar neu…

Observation of excited states in $^{20}$ Mg sheds light on nuclear forces and shell evolution

J. S. Randhawa, R. Kanungo, M. Holl +35

The exotic Borromean nucleus $^{20}$ Mg with $N$ = 8, located at the proton drip-line provides a unique testing ground for nuclear forces and the evolution of shell structure in the…

nucl-ex2005

Reaction and proton-removal cross sections of $^{6}$ Li, $^{7}$ Be, $^{10}$ B, $^{9, 10, 11}$ C, $^{12$N, $^{13, 15}$ O and $^{17}$ Ne on Si at 15 to 53 MeV/nucleon

R. E. Warner, F. Carstoiu, J. A. Brown +12

Excitation functions for total reaction cross sections, $I ¨ _{R}$ , were measured for the light, mainly proton-rich nuclei $^{6}$ Li, $^{7}$ Be, $^{10}$ B, $^{9, 10, 11}$ C, $^{12}$ N, $^{13, 15}$ …

Systematic investigation of the elastic proton-deuteron differential cross section at intermediate energies

K. Ermisch, H. R. Amir-Ahmadi, A. M. van den Berg +16

To investigate the importance of three-nucleon forces (3NF) systematically over a broad range of intermediate energies, the differential cross sections of elastic proton-deuteron s…

nucl-ex2015

Nuclear structure beyond the neutron drip line: the lowest energy states in $^{9}$ He via their T=5/2 isobaric analogs in $^{9}$ Li

E. Uberseder, G. V. Rogachev, V. Z. Goldberg +10

The level structure of the very neutron rich and unbound $^{9}$ He nucleus has been the subject of significant experimental and theoretical study. Many recent works have claimed that…

astro-ph.HE2025

Direct measurement of $^{59}$ Cu( $p$ , $I^\pm$ ) $^{56}$ Ni precludes a strong NiCu cycle in Type-I X-ray bursts

N. Bhathi, J. S. Randhawa, R. Kanungo +36

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…

nucl-ex2001

S17(0) Determined from the Coulomb Breakup of 83 MeV/nucleon 8B

B. Davids, D. W. Anthony, T. Aumann +10

A kinematically complete measurement was made of the Coulomb dissociation of 8B nuclei on a Pb target at 83 MeV/nucleon. The cross section was measured at low relative energies in…

nucl-ex2008

Measurement of two-halo neutron transfer reaction p( $^{11}$ Li, $^{9}$ Li)t at 3 $A$ MeV

I. Tanihata, M. Alcorta, D. Bandyopadhyay +23

The p(\nuc{11}{Li},\nuc{9}{Li})t reaction has been studied for the first time at an incident energy of 3 $A$ MeV delivered by the new ISAC-2 facility at TRIUMF. An active target det…

nucl-ex2006

Lifetime of 19Ne*(4.03 MeV)

R. Kanungo, T. K. Alexander, A. N. Andreyev +20

The Doppler-shift attenuation method was applied to measure the lifetime of the 4.03 MeV state in 19Ne. Utilizing a 3He-implanted Au foil as a target, the state was populated using…

nucl-ex2001

Electromagnetic Dissociation of 8B and the Rate of the 7Be(p,gamma)8B Reaction in the Sun

B. Davids, Sam M. Austin, D. Bazin +4

In an effort to better determine the 7Be(p,gamma)8B reaction rate, we have performed inclusive and exclusive measurements of the Coulomb dissociation of 8B. The former was a study…

nucl-ex2007

Lifetimes of states in 19Ne above the 15 O + alpha breakup threshold

S. Mythili, B. Davids, T. K. Alexander +19

The 15O(alpha,gamma)19Ne reaction plays a role in the ignition of Type I x-ray bursts on accreting neutron stars. The lifetimes of states in 19Ne above the 15O + alpha threshold of…

nucl-ex2023

Cross Sections of the $^{83}$ Rb(p, $I^^{3})^{84}$ Sr and $^{84}$ Kr(p, $I^^{3})^{85}$ Rb Reactions at Energies Characteristic of the Astrophysical $I^^{3}$ Process

M. Williams, B. Davids, G. Lotay +22

We have measured the cross section of the $^{83}$ Rb(p, $I^^{3})^{84}$ Sr radiative capture reaction in inverse kinematics using a radioactive beam of $^{83}$ Rb at incident energies of 2.…

First inverse kinematics measurement of key resonances in the $^{22} Ne (p, I^^{3})^{23} Na$ reaction at stellar temperatures

A. Lennarz, M. Williams, A. M. Laird +17

In this Letter we report on the first inverse kinematics measurement of key resonances in the $^{22} Ne (p, I^^{3})^{23} Na$ reaction which forms part of the NeNa cycle, an…

physics.comp-ph2021

Use of Bayesian Optimization to Understand the Structure of Nuclei

J. Hooker, J. Kovoor, K. L. Jones +41

Monte Carlo simulations are widely used in nuclear physics to model experimental systems. In cases where there are significant unknown quantities, such as energies of states, an it…

nucl-th2004

Determination of S17(0) from published data

R. H. Cyburt, B. Davids, B. K. Jennings

The experimental landscape for the 7Be+p radiative capture reaction is rapidly changing as new high precision data become available. We present an evaluation of existing data, deta…

nucl-th2003

Electromagnetic dissociation of 8B and the astrophysical S factor for 7Be(p,gamma)8B

B. Davids, S. Typel

We present S factor data obtained from the Coulomb dissociation of 83 MeV/nucleon 8B, and analyze 7Be longitudinal momentum distributions measured at 44 and 81 MeV/nucleon using a…

nucl-ex1998

Measurement of E2 Transitions in the Coulomb Dissociation of 8B

B. Davids, D. W. Anthony, Sam M. Austin +11

In an effort to understand the implications of Coulomb dissociation experiments for the determination of the 7Be(p,gamma)8B reaction rate, longitudinal momentum distributions of 7B…

physics.ins-det2026

Transmission Efficiency of the Recoil Mass Spectrometer EMMA at TRIUMF

B. Davids, N. E. Esker, J. Jaeyoung +3

The mean transmission efficiency of the EMMA recoil mass spectrometer at TRIUMF has been measured with 6 different angular apertures at 17 kinetic energy/charge deviations with res…

nucl-ex2017

The nuclear force imprints revealed on the elastic scattering of protons with $^{10}$ C

A. Kumar, R. Kanungo, A. Calci +26

How does nature hold together protons and neutrons to form the wide variety of complex nuclei in the universe? Describing many-nucleon systems from the fundamental theory of quantu…

First inverse kinematics measurement of resonances in $^{7}$ Be( $I^\pm, I^^{3}$ ) $^{11}$ C relevant to neutrino-driven wind nucleosynthesis using DRAGON

A. Psaltis, A. A. Chen, R. Longland +18

A possible mechanism to explain the origin of the light $p$ -nuclei in the Galaxy is the nucleosynthesis in the proton-rich neutrino-driven wind ejecta of core-collapse supernovae v…

New measurement of the $E_{c.m.} = 323$ keV resonance in the $^{19}$ F $($ p,Î³ $)$ ^{20}$Ne reaction

M. Williams, P. Adsley, B. Davids +6

At temperatures below 0.1 GK the $^{19}$ F $(p, I^^{3})^{20}$ Ne reaction is the only breakout path out of the CNO cycle. Experimental studies of this reaction are challenging from a techn…

nucl-ex2002

Alpha-decay branching ratios of near-threshold states in 19Ne and the astrophysical rate of 15O(alpha,gamma)19Ne

B. Davids, A. M. van den Berg, P. Dendooven +9

The 15O(alpha,gamma)19Ne reaction is one of two routes for breakout from the hot CNO cycles into the rp process in accreting neutron stars. Its astrophysical rate depends criticall…

First application of Markov Chain Monte Carlo-based Bayesian data analysis to the Doppler-Shift Attenuation Method

L. J. Sun, C. Fry, B. Davids +31

Motivated primarily by the large uncertainties in the thermonuclear rate of the $^{30}$ P $(p, I^^{3})^{31}$ S reaction that limit our understanding of classical novae, we carried out life…

$s$ -wave scattering lengths for the $^{7}$ Be+p system from an $R$ -matrix analysis

S. N. Paneru, C. R. Brune, R. Giri +23

The astrophysical $S$ -factor for the radiative proton capture reaction on $^{7}$ Be ( $S_{17}$ ) at low energies is affected by the $s$ -wave scattering lengths. We report the measuremen…

nucl-ex2018

Direct Measurement of Astrophysically Important Resonances in $^{38} K (p, I^^{3})^{39} Ca$

G. Christian, G. Lotay, C. Ruiz +12

According to sensitivity studies, the $^{38} K (p, I^^{3})^{39} Ca$ reaction has a significant influence on $Ar$ , $K$ , and $Ca$ …

physics.ins-det2020

Beyond the acceptance limit of DRAGON: the case of the $^{6} Li (I^\pm, I^^{3})^{10} B$ reaction

A. Psaltis, A. A. Chen, D. S. Connolly +13

Radiative capture reactions play a pivotal role for our understanding of the origin of the elements in the cosmos. Recoil separators provide an effective way to study these reactio…

nucl-th2007

Comment on "Influence of protons on the capture of electrons by 7Be in the Sun"

B. Davids, A. Gruzinov, B. K. Jennings

This paper suffers from conceptual difficulties and unjustified approximations that render its conclusions dubious.

nucl-ex2011

Exploring the anomaly in the interaction cross section and matter radius of 23O

R. Kanungo, A. Prochazka, M. Uchida +37

New measurements of the interaction cross sections of 22,23O at 900A MeV performed at the GSI, Darmstadt are reported that address the unsolved puzzle of the large cross section pr…

Constraints on key $^{17}$ O( $I^\pm, I^^{3}$ ) $^{21}$ Ne resonances and impact on the weak s-process

M. Williams, A. M. Laird, A. Choplin +7

The efficiency of the slow neutron-capture process in massive stars is strongly influenced by neutron-capture reactions on light elements. At low metallicity, $^{16}$ O is an import…

First inverse kinematics study of the $^{22}$ Ne $(p, I^^{3})^{23}$ Na reaction and its role in AGB star and classical nova nucleosynthesis

M. Williams, A. Lennarz, A. M. Laird +17

The abundances of sodium and oxygen are observed to be anti-correlated in all well-studied globular clusters. Asymptotic giant branch (AGB) stars undergoing hot bottom burning (HBB…

nucl-ex2021

First Direct Measurement of an Astrophysical p-Process Reaction Cross Section Using a Radioactive Ion Beam

G. Lotay, S. A. Gillespie, M. Williams +35

We have performed the first direct measurement of the 83Rb(p,g) radiative capture reaction cross section in inverse kinematics using a radioactive beam of 83Rb at incident energies…

nucl-ex2021

First direct measurement of $^{59}$ Cu(p, $I^\pm$ ) $^{56}$ Ni: A step towards constraining the Ni-Cu cycle in the Cosmos

J. S. Randhawa, R. Kanungo, J. Refsgaard +34

Reactions on the proton-rich nuclides drive the nucleosynthesis in Core-Collapse Supernovae (CCSNe) and in X-ray bursts (XRBs). CCSNe eject the nucleosynthesis products to the inte…