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NSR database version of April 27, 2024.

Search: Author = M.Ramalho

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2024RA06      Phys.Rev. C 109, 014326 (2024)

M.Ramalho, J.Suhonen

Computed total β-electron spectra for decays of Pb and Bi in the ^{220, 222}Rn radioactive chains

doi: 10.1103/PhysRevC.109.014326
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2024RA14      Phys.Rev. C 109, 034321 (2024)

M.Ramalho, J.Suhonen

g_A-sensitive β spectral shapes in the mass A=86-99 region assessed by the nuclear shell model

doi: 10.1103/PhysRevC.109.034321
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2023GE04      Phys.Rev. C 108, 045502 (2023)

Z.Ge, T.Eronen, A.de Roubin, M.Ramalho, J.Kostensalo, J.Kotila, J.Suhonen, D.A.Nesterenko, A.Kankainen, P.Ascher, O.Beliuskina, M.Flayol, M.Gerbaux, S.Grevy, M.Hukkanen, A.Husson, A.Jaries, A.Jokinen, I.D.Moore, P.Pirinen, J.Romero, M.Stryjczyk, V.Virtanen, A.Zadvornaya

β^- decay Q-value measurement of ¹³⁶Cs and its implications for neutrino studies

doi: 10.1103/PhysRevC.108.045502
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2023GI07      Universe 9, 270 (2023)

P.Gimeno, L.Jokiniemi, J.Kotila, M.Ramalho, J.Suhonen

Ordinary Muon Capture on ¹³⁶Ba: Comparative Study Using the Shell Model and pnQRPA

NUCLEAR REACTIONS ¹³⁶Ba(μ, X)¹³⁶Cs, E not given; calculated energy levels, J, π using the interacting shell model (ISM) and proton–neutron quasiparticle random-phase approximation (pnQRPA). Comparison with available data.

doi: 10.3390/universe9060270
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2023NE13      Phys.Rev. C 108, 054301 (2023)

D.A.Nesterenko, J.Ruotsalainen, M.Stryjczyk, A.Kankainen, L.Al Ayoubi, O.Beliuskina, P.Delahaye, T.Eronen, M.Flayol, Z.Ge, W.Gins, M.Hukkanen, A.Jaries, D.Kahl, D.Kumar, S.Nikas, A.Ortiz-Cortes, H.Penttila, D.Pitman-Weymouth, A.Raggio, M.Ramalho, M.Reponen, S.Rinta-Antila, J.Romero, A.de Roubin, P.C.Srivastava, J.Suhonen, V.Virtanen, A.Zadvornaya

High-precision measurements of low-lying isomeric states in ^120-124In with the JYFLTRAP double Penning trap

doi: 10.1103/PhysRevC.108.054301
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2022ER01      Phys.Lett. B 830, 137135 (2022)

T.Eronen, Z.Ge, A.de Roubin, M.Ramalho, J.Kostensalo, J.Kotila, O.Beliushkina, C.Delafosse, S.Geldhof, W.Gins, M.Hukkanen, A.Jokinen, A.Kankainen, I.D.Moore, D.A.Nesterenko, M.Stryjczyk, J.Suhonen

High-precision measurement of a low Q value for allowed β-decay of ¹³¹I related to neutrino mass determination

RADIOACTIVITY ¹³¹I(β^-) [from U(p, X), E=30 MeV]; measured cyclotron frequency ratios; deduced Q-value, partial T_1/2 for the transition. Comparison with the Atomic Mass Evaluation 2020, theoretical calculations. The double Penning trap mass spectrometer JYFLTRAP at the IGISOL facility, the K-130 cyclotron.

doi: 10.1016/j.physletb.2022.137135
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2022RA20      Phys.Rev. C 106, 015501 (2022)

M.Ramalho, Z.Ge, T.Eronen, D.A.Nesterenko, J.Jaatinen, A.Jokinen, A.Kankainen, J.Kostensalo, J.Kotila, M.I.Krivoruchenko, J.Suhonen, K.S.Tyrin, V.Virtanen

Observation of an ultralow-Q-value electron-capture channel decaying to ⁷⁵As via a high-precision mass measurement

ATOMIC MASSES ⁷⁵As, ⁷⁶Ge; ⁷⁷Se, ⁷⁶Se; ⁹⁴Mo, ⁹⁵Mo; measured cyclotron frequency ratios using phase-imaging ion-cyclotron-resonance technique (PI-ICR) and high-precision Penning-trap mass spectrometry (PTMS) with a double Penning trap mass spectrometer (JYFLTRAP) at the IGISOL facility of the University of Jyvaskyla; deduced precise Q(β) values for decays of ⁷⁵Se and ⁷⁵Ge to ⁷⁵As, with three ultra-low Q-value energetically valid β transitions, one of which as a possible candidate for antineutrino mass determination. Comparison with evaluated data in AME2020.

RADIOACTIVITY ⁷⁵Se(EC); ⁷⁵Ge(β^-); deduced precise Q(β) values from measurements of difference in mass excesses of ⁷⁵As and ⁷⁶Ge, and three ultra-low Q-value energetically valid β transitions, with one as a possible candidate for antineutrino mass determination. Comparison with evaluated data in AME2020.

NUCLEAR STRUCTURE ⁷⁵As; calculated levels, J, π using shell-model code NUSHELLX in a single-particle model space consisting of 1f_5/2, 2p_3/2, 2p_1/2, and 1g_9/2 neutron and proton orbitals, with jun45pn and jj44bpn interactions, and compared results with experimental data.

doi: 10.1103/PhysRevC.106.015501
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2022RA21      Phys.Rev. C 106, 024315 (2022)

M.Ramalho, J.Suhonen, J.Kostensalo, G.A.Alcala, A.Algora, M.Fallot, A.Porta, A.-A.Zakari-Issoufou

Analysis of the total β-electron spectrum of ⁹²Rb: Implications for the reactor flux anomalies

RADIOACTIVITY ⁹²Rb(β^-); calculated shape of a total electron spectrum from β^--decay transitions, including all the relevant allowed and first-forbidden β^- transitions, with guidelines from data on measured excitation energies of the final states, and using β^- branching ratios from total absorption γ-ray spectrum (TAGS) in 2015Za10: Phys. Rev. Lett. 115, 102503. Microscopic nuclear-structure calculation of β^- spectrum from ⁹²Rb fission product using large-scale shell-model with NUSHELLX@MSU code. Relevance to spectral bump in the reactor-antineutrino flux profile, and decays of fission products in reactor applications.

doi: 10.1103/PhysRevC.106.024315
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