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Title: Measurement of key resonance states for the P 30 ( p , γ ) S 31 reaction rate, and the production of intermediate-mass elements in nova explosions

Authors:
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Publication Date:
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1344001
Grant/Contract Number:
FG52-08NA28552; AC02-06CH11357; PHY-1102511(NSCL); AC02-05CH11231(LBNL)
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 769; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-28 13:31:41; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Kankainen, A., Woods, P. J., Schatz, H., Poxon-Pearson, T., Doherty, D. T., Bader, V., Baugher, T., Bazin, D., Brown, B. A., Browne, J., Estrade, A., Gade, A., José, J., Kontos, A., Langer, C., Lotay, G., Meisel, Z., Montes, F., Noji, S., Nunes, F., Perdikakis, G., Pereira, J., Recchia, F., Redpath, T., Stroberg, R., Scott, M., Seweryniak, D., Stevens, J., Weisshaar, D., Wimmer, K., and Zegers, R.. Measurement of key resonance states for the P 30 ( p , γ ) S 31 reaction rate, and the production of intermediate-mass elements in nova explosions. Netherlands: N. p., 2017. Web. doi:10.1016/j.physletb.2017.01.084.
Kankainen, A., Woods, P. J., Schatz, H., Poxon-Pearson, T., Doherty, D. T., Bader, V., Baugher, T., Bazin, D., Brown, B. A., Browne, J., Estrade, A., Gade, A., José, J., Kontos, A., Langer, C., Lotay, G., Meisel, Z., Montes, F., Noji, S., Nunes, F., Perdikakis, G., Pereira, J., Recchia, F., Redpath, T., Stroberg, R., Scott, M., Seweryniak, D., Stevens, J., Weisshaar, D., Wimmer, K., & Zegers, R.. Measurement of key resonance states for the P 30 ( p , γ ) S 31 reaction rate, and the production of intermediate-mass elements in nova explosions. Netherlands. doi:10.1016/j.physletb.2017.01.084.
Kankainen, A., Woods, P. J., Schatz, H., Poxon-Pearson, T., Doherty, D. T., Bader, V., Baugher, T., Bazin, D., Brown, B. A., Browne, J., Estrade, A., Gade, A., José, J., Kontos, A., Langer, C., Lotay, G., Meisel, Z., Montes, F., Noji, S., Nunes, F., Perdikakis, G., Pereira, J., Recchia, F., Redpath, T., Stroberg, R., Scott, M., Seweryniak, D., Stevens, J., Weisshaar, D., Wimmer, K., and Zegers, R.. 2017. "Measurement of key resonance states for the P 30 ( p , γ ) S 31 reaction rate, and the production of intermediate-mass elements in nova explosions". Netherlands. doi:10.1016/j.physletb.2017.01.084.
@article{osti_1344001,
title = {Measurement of key resonance states for the P 30 ( p , γ ) S 31 reaction rate, and the production of intermediate-mass elements in nova explosions},
author = {Kankainen, A. and Woods, P. J. and Schatz, H. and Poxon-Pearson, T. and Doherty, D. T. and Bader, V. and Baugher, T. and Bazin, D. and Brown, B. A. and Browne, J. and Estrade, A. and Gade, A. and José, J. and Kontos, A. and Langer, C. and Lotay, G. and Meisel, Z. and Montes, F. and Noji, S. and Nunes, F. and Perdikakis, G. and Pereira, J. and Recchia, F. and Redpath, T. and Stroberg, R. and Scott, M. and Seweryniak, D. and Stevens, J. and Weisshaar, D. and Wimmer, K. and Zegers, R.},
abstractNote = {},
doi = {10.1016/j.physletb.2017.01.084},
journal = {Physics Letters. Section B},
number = C,
volume = 769,
place = {Netherlands},
year = 2017,
month = 6
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2017.01.084

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  • We report the first experimental constraints on spectroscopic factors and strengths of key resonances in the P-30(p, gamma)S-31 reaction critical for determining the production of intermediate-mass elements up to Ca in nova ejecta. The P-30(d,n)S-31 reaction was studied in inverse kinematics using the GRETINA gamma-ray array to measure the angle-integrated cross-sections of states above the proton threshold. In general, negative parity states are found to be most strongly produced but the absolute values of spectroscopic factors are typically an order of magnitude lower than predicted by the shell-model calculations employing WBP Hamiltonian for the negative-parity states. The results clearly indicatemore » the dominance of a single 3/2(-) resonance state at 196 keV in the region of nova burning T approximate to 0.10-0.17 GM, well within the region of interest for nova nucleosynthesis. Hydrodynamic simulations of nova explosions have been performed to demonstrate the effect on the composition of nova ejecta.« less
  • Here, spin–isospin excitations in 100Nb were studied via the charge-exchange reaction at 115 MeV/u with the goal to constrain theoretical models used to describe the isovector spin response of nuclei. The experiment was performed with a secondary beam of tritons, and 3He particles were analyzed in the S800 magnetic spectrometer. Decay by neutron emission from excited states in 100Nb was observed by using plastic and liquid scintillator arrays. Differential cross sections were analyzed and monopole excitations were revealed by using a multipole decomposition analysis. The Gamow–Teller transition strength observed at low excitation energies, which is important for estimating the electron-capturemore » rate in astrophysical scenarios, was strongly fragmented and reduced compared to single-particle and spherical mean-field models. The consideration of deformation in the theoretical estimates was found to be important to better describe the fragmentation and strengths. A strong excitation of the isovector spin giant monopole resonance was observed, and well reproduced by the mean-field models. Its presence makes the extraction of Gamow–Teller strengths at high excitation energies difficult. The branches for statistical and direct decay by neutron emission were identified in the spectra. The upper limit for the branching ratio by direct decay (integrated over all observed excitations) was determined to be 20 ± 6%. Even though the statistical uncertainties in the neutron-coincident data were too large to perform detailed studies of the decay by neutron emission from individual states and resonances, the experiment demonstrates the feasibility of the method.« less
  • Here, spin–isospin excitations in 100Nb were studied via the charge-exchange reaction at 115 MeV/u with the goal to constrain theoretical models used to describe the isovector spin response of nuclei. The experiment was performed with a secondary beam of tritons, and 3He particles were analyzed in the S800 magnetic spectrometer. Decay by neutron emission from excited states in 100Nb was observed by using plastic and liquid scintillator arrays. Differential cross sections were analyzed and monopole excitations were revealed by using a multipole decomposition analysis. The Gamow–Teller transition strength observed at low excitation energies, which is important for estimating the electron-capturemore » rate in astrophysical scenarios, was strongly fragmented and reduced compared to single-particle and spherical mean-field models. The consideration of deformation in the theoretical estimates was found to be important to better describe the fragmentation and strengths. A strong excitation of the isovector spin giant monopole resonance was observed, and well reproduced by the mean-field models. Its presence makes the extraction of Gamow–Teller strengths at high excitation energies difficult. The branches for statistical and direct decay by neutron emission were identified in the spectra. The upper limit for the branching ratio by direct decay (integrated over all observed excitations) was determined to be 20 ± 6%. Even though the statistical uncertainties in the neutron-coincident data were too large to perform detailed studies of the decay by neutron emission from individual states and resonances, the experiment demonstrates the feasibility of the method.« less