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NSR database version of April 27, 2024.

Search: Author = R.Malecek

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2021BI06      Phys.Rev. C 103, L051303 (2021)

J.Bishop, G.V.Rogachev, S.Ahn, E.Aboud, M.Barbui, A.Bosh, J.Hooker, C.Hunt, H.Jayatissa, E.Koshchiy, R.Malecek, S.T.Marley, M.Munch, E.C.Pollacco, C.D.Pruitt, B.T.Roeder, A.Saastamoinen, L.G.Sobotka, S.Upadhyayula

Evidence against the Efimov effect in ¹²C from spectroscopy and astrophysics

RADIOACTIVITY ¹²N(β⁺); ¹²B(β^-); measured β-delayed charged particles, Eα, Iα from the decay of 40-MeV ¹²N beam stopped inside the active-area of the TexAT (Texas Active target) TPC (Time Projection Chamber), Eγ, Iγ, γγ-coin from the decay of ¹²B using Gammasphere array at ANL. ¹²C; deduced no evidence for an hypothetical state predicted by Efimov effect at 7.458 MeV from a combined analysis of the two experiments involving charged-particle spectroscopy at Texas A and M, and γ-ray measurements at ANL, along with astrophysical rate calculations. Relevance to rate required for stars to undergo the red giant phase.

doi: 10.1103/PhysRevC.103.L051303
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2020BI11      Phys.Rev. C 102, 041303 (2020)

J.Bishop, G.V.Rogachev, S.Ahn, E.Aboud, M.Barbui, A.Bosh, C.Hunt, H.Jayatissa, E.Koshchiy, R.Malecek, S.T.Marley, E.C.Pollacco, C.D.Pruitt, B.T.Roeder, A.Saastamoinen, L.G.Sobotka, S.Upadhyayula

Almost medium-free measurement of the Hoyle state direct-decay component with a TPC

RADIOACTIVITY ¹²N(β⁺), (β⁺α)[from ³He(¹⁰B, ¹²N), E=11 MeV/nucleon at K500 cyclotron at the Cyclotron Institute at Texas A and M University, followed by isotopic separation using Momentum Achromatic Recoil Spectrometer]; measured β-delayed charged-particles using Texas active target time-projection chamber (TPC). ¹²C; deduced upper limit for the nonsequential component of the decay of the excited 0+, Hoyle state in an almost medium-free reaction. Comparison with previous experimental results, and with predictions from Faddeev calculations.

doi: 10.1103/PhysRevC.102.041303
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2020BI15      Nucl.Instrum.Methods Phys.Res. A964, 163773 (2020)

J.Bishop, G.V.Rogachev, S.Ahn, E.Aboud, M.Barbui, P.Baron, A.Bosh, E.Delagnes, J.Hooker, C.Hunt, H.Jayatissa, E.Koshchiy, R.Malecek, S.T.Marley, R.O'Dwyer, E.C.Pollacco, C.Pruitt, B.T.Roeder, A.Saastamoinen, L.G.Sobotka, S.Upadhyayula

Beta-delayed charged-particle spectroscopy using TexAT

RADIOACTIVITY ¹²N(IT), (EC), ¹²C(3α), ⁸Be(2α) [from ³He(¹⁰B, n)¹²N, E=11 MeV/nucleon]; measured decay products, Eα, Iα; deduced branching ratio of ¹²N to states in ¹²C above the 3-α threshold, the total branching ratio to the Hoyle state, ¹²N T_1/2 using the β-delayed charged-particle-decay. Comparison with available data.

doi: 10.1016/j.nima.2020.163773
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