Properties of {sup 20}Na, {sup 24}Al, {sup 28}P, {sup 32}Cl, and {sup 36}K for studies of explosive hydrogen burning

Journal Article · Wed Sep 15 04:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.035805· OSTI ID:21421043

Wrede, C ^[1]; Clark, J A ^[2]; Deibel, C M ^[2]; Faestermann, T; Parikh, A; Bishop, S; Eppinger, K; Kruecken, R; Lepyoshkina, O; Rugel, G ^[3]; Hertenberger, R; Wirth, H -F ^[4]; Chen, A A ^[5]; Freeman, B M ^[1]; Setoodehnia, K ^[5]

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1. Department of Physics, University of Washington, Seattle, Washington 98195 (United States)
2. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520 (United States)
3. Physik Department E12, Technische Universitaet Muenchen, D-85748 Garching (Germany)
4. Fakultaet fuer Physik, Ludwigs-Maximilians-Universitaet Muenchen, D-85784 Garching (Germany)
5. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada)

The radiative proton-capture reactions {sup 19}Ne(p,{gamma}){sup 20}Na, {sup 23}Mg(p,{gamma}){sup 24}Al, {sup 27}Si(p,{gamma}){sup 28}P, {sup 31}S(p,{gamma}){sup 32}Cl, and {sup 35}Ar(p,{gamma}){sup 36}K potentially influence energy generation and/or nucleosynthesis during explosive hydrogen burning in classical novae and/or type I x-ray bursts. The thermonuclear rates of these reactions are dependent on resonance energies E{sub r}=E{sub x}-Q and strengths {omega}{gamma}. The {sup 20}Ne({sup 3}He,t){sup 20}Na, {sup 24}Mg({sup 3}He,t){sup 24}Al, {sup 28}Si({sup 3}He,t){sup 28}P, {sup 32}S({sup 3}He,t){sup 32}Cl, and {sup 36}Ar({sup 3}He,t){sup 36}K reactions have been measured using a 32-MeV, {sup 3}He{sup 2+} beam; ion-implanted carbon-foil targets developed at the University of Washington; and the Munich Q3D magnetic spectrograph. This experiment has already yielded precision mass measurements of {sup 20}Na, {sup 24}Al, {sup 28}P, and {sup 32}Cl [C. Wrede et al., Phys. Rev. C 81, 055503 (2010)], which are used presently to constrain the corresponding (p,{gamma}) reaction Q values. The new {sup 24}Al and {sup 28}P masses resolve a discrepancy in the energy of the lowest-energy resonance in the {sup 23}Mg(p,{gamma}){sup 24}Al reaction and better constrain a direct measurement of its strength. Excitation energies in {sup 32}Cl and {sup 36}K have also been measured. An important new proton-unbound level has been found at E{sub x}=2196.9(7) keV in {sup 36}K and the uncertainties in {sup 36}K excitation energies have been reduced by over an order of magnitude. Using the new data on {sup 36}K, the A=36, T=1 triplets have been reassigned. The thermonuclear {sup 35}Ar(p,{gamma}){sup 36}K reaction rate is found to be much higher than a commonly adopted rate and this could affect energy generation in type I x-ray bursts.

• OSTI ID: 21421043
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 82; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCURACY
ALKALINE EARTH ISOTOPES
ALUMINIUM 24
ALUMINIUM ISOTOPES
ARGON 35
ARGON 36
ARGON ISOTOPES
BARYON REACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CAPTURE
CARBON
CHARGED-PARTICLE REACTIONS
CHLORINE 32
CHLORINE ISOTOPES
DECAY
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXCITATION
FERMIONS
GAMMA DECAY
HADRON REACTIONS
HADRONS
HELIUM 3
HELIUM ISOTOPES
HYDROGEN BURNING
ION IMPLANTATION
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KINETICS
LIGHT NUCLEI
MAGNESIUM 23 TARGET
MAGNESIUM 24
MAGNESIUM ISOTOPES
MEV RANGE
MEV RANGE 10-100
MILLISECONDS LIVING RADIOISOTOPES
NEON 20 TARGET
NONMETALS
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
NUCLEOSYNTHESIS
ODD-ODD NUCLEI
PARTICLE DECAY
PHOSPHORUS 28
PHOSPHORUS ISOTOPES
POTASSIUM 36
POTASSIUM ISOTOPES
PROTON REACTIONS
PROTONS
RADIATIONS
RADIATIVE DECAY
RADIOISOTOPES
REACTION KINETICS
RESONANCE
SECONDS LIVING RADIOISOTOPES
SILICON 27
SILICON 28
SILICON ISOTOPES
SODIUM 20
SODIUM ISOTOPES
STABLE ISOTOPES
STAR BURNING
SULFUR 31
SULFUR ISOTOPES
SYNTHESIS
TARGETS
THERMONUCLEAR REACTIONS
X RADIATION