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Title: Direct Measurement of {sup 21}Na+{alpha} Stellar Reaction

Abstract

The measurement of the resonant alpha scattering and the {sup 21}Na({alpha}, p) reaction were performed for the first time in inverse kinematics with the thick target method using a {sup 21}Na radioisotope (RI) beam. This paper reports the current result of alpha scattering measurement and its astrophysics implication.

Authors:
; ; ; ; ;  [1];  [2]; ;  [3];  [4]; ;  [5];  [6]
  1. Center for Nuclear Study (CNS), University of Tokyo (Japan)
  2. Department of Physics, Kuyshu University (Japan)
  3. Department of Physics, Tohoku University (Japan)
  4. Department of Physics, Yamagata University (Japan)
  5. Institute of Physics, Vietnamese Academy of Science and Technology (Viet Nam)
  6. Advanced Science Research Center, Japan Atomic Energy Agency (JAEA) (Japan)
Publication Date:
OSTI Identifier:
21435994
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1269; Journal Issue: 1; Conference: OMEG-2010: 10. international symposium on origin of matter and evolution of galaxies, Osaka (Japan), 8-10 Mar 2010; Other Information: DOI: 10.1063/1.3485175; (c) 2010 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA REACTIONS; ASTROPHYSICS; BETA DECAY; GAMMA RADIATION; NUCLEOSYNTHESIS; PROTONS; RADIOACTIVE ION BEAMS; SCATTERING; SODIUM 21; SODIUM 21 TARGET; BARYONS; BEAMS; BETA DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; CHARGED-PARTICLE REACTIONS; DECAY; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; FERMIONS; HADRONS; ION BEAMS; IONIZING RADIATIONS; ISOTOPES; LIGHT NUCLEI; NUCLEAR DECAY; NUCLEAR REACTIONS; NUCLEI; NUCLEONS; ODD-EVEN NUCLEI; PHYSICS; RADIATIONS; RADIOISOTOPES; SECONDS LIVING RADIOISOTOPES; SODIUM ISOTOPES; SYNTHESIS; TARGETS

Citation Formats

Binh, D. N., Kubono, S., Yamaguchi, H., Hayakawa, S., Hashimoto, T., Kahl, D., Teranishi, T., Iwasa, N., Kume, N., Kato, S., Khiem, L. H., Tho, N. T., and Wakabayashi, Y. Direct Measurement of {sup 21}Na+{alpha} Stellar Reaction. United States: N. p., 2010. Web. doi:10.1063/1.3485175.
Binh, D. N., Kubono, S., Yamaguchi, H., Hayakawa, S., Hashimoto, T., Kahl, D., Teranishi, T., Iwasa, N., Kume, N., Kato, S., Khiem, L. H., Tho, N. T., & Wakabayashi, Y. Direct Measurement of {sup 21}Na+{alpha} Stellar Reaction. United States. doi:10.1063/1.3485175.
Binh, D. N., Kubono, S., Yamaguchi, H., Hayakawa, S., Hashimoto, T., Kahl, D., Teranishi, T., Iwasa, N., Kume, N., Kato, S., Khiem, L. H., Tho, N. T., and Wakabayashi, Y. 2010. "Direct Measurement of {sup 21}Na+{alpha} Stellar Reaction". United States. doi:10.1063/1.3485175.
@article{osti_21435994,
title = {Direct Measurement of {sup 21}Na+{alpha} Stellar Reaction},
author = {Binh, D. N. and Kubono, S. and Yamaguchi, H. and Hayakawa, S. and Hashimoto, T. and Kahl, D. and Teranishi, T. and Iwasa, N. and Kume, N. and Kato, S. and Khiem, L. H. and Tho, N. T. and Wakabayashi, Y.},
abstractNote = {The measurement of the resonant alpha scattering and the {sup 21}Na({alpha}, p) reaction were performed for the first time in inverse kinematics with the thick target method using a {sup 21}Na radioisotope (RI) beam. This paper reports the current result of alpha scattering measurement and its astrophysics implication.},
doi = {10.1063/1.3485175},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1269,
place = {United States},
year = 2010,
month = 8
}
  • The first direct measurement of the {sup 11}C({alpha}, p){sup 14}N reaction cross section of astrophysical interest has been performed for the center-of-mass energies from 1 to 4.5 MeV with the CRIB (Center for Nuclear Study Radioactive Ion Beam separator). We successfully distinguished the transition to the ground state of {sup 14}N and that to the second excited state with a comparable yield. The resonant shapes in the preliminary excitation function for the ground state transition have been confirmed to be consistent with the ones from the time-reversal reaction data of previous experiments.
  • The cross section of the p(n,{gamma})d reaction was measured for the first time in the neutron energy between 10 and 280 keV. The result is in good agreement with the theoretical values calculated recently by Hale {ital et} {ital al}. and Ohtsubo {ital et} {ital al}. The present result, however, is not consistent with the estimated value by using the experimental value of the deuteron photo-disintegration. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
  • Preparation for direct measurement of 12C+4He{yields}16O+{gamma} reaction at stellar energy has been made in Kyushu University tandem laboratory (KUTL) since 1914. We plan to measure the reaction at Ecm = 2.4-0.7 MeV where the cross section is estimated to be 60 nbarn-1pbarn. Many instrumental developments have been made for a 12C beam, a windowless helium gas target, 16O detection, background reduction. We started the measurement in 2006.
  • A cross section measurement with a direct {sup 16}O detection method for the reaction energy from E{sub cm} = 2.4 down to 0.7 MeV is planned at Kyushu University Tandem Laboratory (KUTL). To perform the experiment successfully and to get the quantitative information of the cross section within the 10% error, we have newly developed several instruments in 2009, such as a blow-in type windowless gas target and movable slit system placed in the recoil mass separator. By using the windowless blow-in gas target, a pressure of 24 Torr was achieved. The effective thickness along the beam axis was measuredmore » by p+{sup 4}He scattering. Thanks to the movable slits installed in a recoil mass separator and the trajectory analysis, we found effective reduction of background conditions from the {sup 12}C beam.« less
  • The internal pair decay of the 0/sup +/ 7.65-MeV state of /sup 12/C has been observed in coincidence with inelastic protons from /sup 12/C(p,p')/sup 12/C(7.65), using a plastic scintillator of essentially 4..pi.. sr solid angle. The branching ratio measured, GAMMA/sub ..pi..//GAMMA = (6.0 +- 1.1) x 10/sup -6/, is in excellent agreement with the previous measurement by Alburger, and reduces the uncertainty in the stellar triple-..cap alpha.. reaction rate by almost a factor of 2. Implications for the astrophysical production of /sup 12/C and /sup 16/O are discussed.