Zobrazeno 1 - 10
of 263
pro vyhledávání: '"Longland, R"'
Autor:
Marshall, C., Setoodehnia, K., Cinquegrana, G. C., Kelly, J. H., Chaves, F. Portillo, Karakas, A., Longland, R.
The star to star anticorrelation of sodium and oxygen {is} a defining feature of globular clusters, but, to date, the astrophysical site responsible for this unique chemical signature remains unknown. Sodium enrichment within these clusters depends s
Externí odkaz:
http://arxiv.org/abs/2303.06128
Autor:
Portillo, F., Longland, R., Cooper, A. L., Hunt, S., Laird, A. M., Marshall, C., Setoodehnia, K.
Publikováno v:
Phys. Rev. C 107, 035809 (2023)
The $^{18}$F(p, $\alpha$)$^{15}$O reaction is key to determining the $^{18}$F abundance in classical novae. However, the cross section for this reaction has large uncertainties at low energies largely caused by interference effects. Here, we resolve
Externí odkaz:
http://arxiv.org/abs/2303.03596
Autor:
Adsley, P, Williams, M, Harrouz, D S, Carrasco-Rojas, D P, de Séréville, N, Hammache, F, Longland, R, Bastin, B, Davids, B, Faestermann, T, Fougères, C, Greife, U, Hertenberger, R, Hutcheon, D, La Cognata, M, Laird, AM, Lamia, L, Lennarz, A, Meyer, A, Santos, F d'Oliveira, Palmerini, S, Psaltis, A, Pizzone, R G, Romano, S, Ruiz, C, Tumino, A, Wirth, H-F
Globular clusters contain multiple stellar populations, with some previous generation of stars polluting the current stars with heavier elements. Understanding the history of globular clusters is helpful in understanding how galaxies merged and evolv
Externí odkaz:
http://arxiv.org/abs/2212.03648
Autor:
Psaltis, A., Chen, A. A., Longland, R., Connolly, D. S., Brune, C. R., Davids, B., Fallis, J., Giri, R., Greife, U, Hutcheon, D. A., Kroll, L., Lennarz, A., Liang, J., Lovely, M., Luo, M., Marshall, C., Paneru, S. N., Parikh, A., Ruiz, C., Shotter, A. C., Williams, M.
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 via the $\nu p$-process. However this production scenario is very sensi
Externí odkaz:
http://arxiv.org/abs/2209.06472
Autor:
Psaltis, A., Chen, A. A., Longland, R., Connolly, D. S., Brune, C. R., Davids, B., Fallis, J., Giri, R., Greife, U, Hutcheon, D. A., Kroll, L., Lennarz, A., Liang, J., Lovely, M., Luo, M., Marshall, C., Paneru, S. N., Parikh, A., Ruiz, C., Shotter, A. C., Williams, M.
We have performed the first direct measurement of two resonances of the $^7$Be($\alpha,\gamma$)$^{11}$C reaction with unknown strengths using an intense radioactive $^7$Be beam and the DRAGON recoil separator. We report on the first measurement of th
Externí odkaz:
http://arxiv.org/abs/2209.06465
Autor:
Frost-Schenk, J., Adsley, P., Laird, A. M., Longland, R., Angus, C., Barton, C., Choplin, A., Diget, C. Aa., Hirschi, R., Marshall, C., Chaves, F. Portillo, Setoodehnia, K.
Massive stars are crucial to galactic chemical evolution for elements heavier than iron. Their contribution at early times in the evolution of the Universe, however, is unclear due to poorly constrained nuclear reaction rates. The competing $^{17}$O(
Externí odkaz:
http://arxiv.org/abs/2206.04167
Autor:
Harrouz, D. S., de Séréville, N., Adsley, P., Hammache, F., Longland, R., Bastin, B., Faestermann, T., Hertenberger, R., La Cognata, M., Lamia, L., Meyer, A., Palmerini, S., Pizzone, R. G., Romano, S., Tumino, A., Wirth, H. -F.
[Background] Abundance anomalies in some globular clusters, such as the enhancement of potassium and the depletion of magnesium, can be explained in terms of an earlier generation of stars polluting the presently observed ones. It was shown that the
Externí odkaz:
http://arxiv.org/abs/2201.03411
Publikováno v:
Phys. Rev. C 102, 024609 (2020)
Transfer reactions provide information about the single-particle nature of nuclear levels. In particular, the differential cross sections from these measurements are sensitive to the angular momentum of the transferred particle and the spectroscopic
Externí odkaz:
http://arxiv.org/abs/2006.14530
Autor:
Meyer, A., de Séréville, N., Laird, A. M., Hammache, F., Longland, R., Lawson, T., Pignatari, M., Audouin, L., Beaumel, D., Fortier, S., Kiener, J., Lefebvre-Schuhl, A., Pellegriti, M. G., Stanoiu, M., Tatischeff, V.
Publikováno v:
Phys. Rev. C 102, 035803 (2020)
It has been suggested that hydrogen ingestion into the helium shell of massive stars could lead to high $^{13}$C and $^{15}$N excesses when the shock of a core-collapse supernova passes through its helium shell. This prediction questions the origin o
Externí odkaz:
http://arxiv.org/abs/2006.13589
Autor:
Hamill, C. B., Woods, P. J., Kahl, D., Longland, R., Greene, J. P., Marshall, C., Portillo, F., Setoodehnia, K.
Publikováno v:
Eur. Phys. J. A (2020) 56:36
The rate of the $^{25}$Al($p$,$\gamma$)$^{26}$Si reaction is one of the few key remaining nuclear uncertainties required for predicting the production of the cosmic $\gamma$-ray emitter $^{26}$Al in explosive burning in novae. This reaction rate is d
Externí odkaz:
http://arxiv.org/abs/2002.03934