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NSR database version of April 11, 2024.

Search: Author = G.W.Misch

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2023HO14      Phys.Rev.Lett. 131, 262701 (2023)

D.E.M.Hoff, K.Kolos, G.W.Misch, D.Ray, B.Liu, A.A.Valverde, M.Brodeur, D.P.Burdette, N.Callahan, J.A.Clark, A.T.Gallant, F.G.Kondev, G.E.Morgan, M.R.Mumpower, R.Orford, W.S.Porter, F.Rivero, G.Savard, N.D.Scielzo, K.S.Sharma, K.Sieja, T.M.Sprouse, L.Varriano

Direct Mass Measurements to Inform the Behavior of ^128mSb in Nucleosynthetic Environments

ATOMIC MASSES ^128,128mSb; measured cyclotron frequencies; deduced mass excesses, isomer excitation energy. Comparison with AME2020, NUBASE2020, state-of-the-art shell model calculations using the GCN5082 interaction. The phase-imaging ion-cyclotron resonance (PI-ICR) technique with the Canadian Penning Trap (CPT) mass spectrometer at the Californium Rare Isotope Breeder Upgrade facility.

doi: 10.1103/PhysRevLett.131.262701
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2022SP02      Astrophys.J. 929, 22 (2022)

T.M.Sprouse, G.W.Misch, M.R.Mumpower

Isochronic Evolution and the Radioactive Decay of r-process Nuclei

doi: 10.3847/1538-4357/ac470f
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2021MI02      Astrophys.J.Suppl.Ser. 252, 2 (2021)

G.W.Misch, S.K.Ghorui, P.Banerjee, Y.Sun, M.R.Mumpower

Astromers: Nuclear Isomers in Astrophysics

RADIOACTIVITY ²⁶Al, ³⁴Cl, ⁸⁵Kr, ¹²¹Sn(IT), ^{121,123,125,127}Sn, ¹²⁸Sb, ¹⁷⁰Ho, ¹⁷⁶Lu, ¹⁸²Hf(IT), ⁵⁸Mn, ¹¹³Cd(β^-); calculated thermally mediated transition rates between the ground state and long-lived isomers in nuclei; deduced delimiting a thermalization temperature above which a nucleus may be considered a single species and below which it must be treated as two separate species: a ground-state species and an astrophysical isomer ("astromer") species.

doi: 10.3847/1538-4365/abc41d
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2021MI12      Astrophys.J. 913, L2 (2021)

G.W.Misch, T.M.Sprouse, M.R.Mumpower

Astromers in the Radioactive Decay of r-process Nuclei

RADIOACTIVITY ^69,71Zn, ^79,81Se, ^83,85Kr, ^93,95,97Nb, ⁹⁹Tc, ^113,115,117Cd, ^115,117,119In, ^119,121,129Sn, ^126,128,130Sb, ^{125,127,129,131,133}Te, ^131,133Xe, ¹³⁷Ba, ¹⁴⁴Pr, ¹⁶⁶Ho, ¹⁸⁹Os, ^191,195Ir, ¹⁹⁵Pt(IT); analyzed available data; deduced the dynamic population of nuclear isomers in the r process.

doi: 10.3847/2041-8213/abfb74
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2021WA45      Phys.Rev.Lett. 127, 172702 (2021)

L.-J.Wang, L.Tan, Z.Li, G.W.Misch, Y.Sun

Urca Cooling in Neutron Star Crusts and Oceans: Effects of Nuclear Excitations

RADIOACTIVITY ³¹Mg, ²⁵Na(EC); analyzed available data; deduced impact of the excited-state structure of atomic nuclei on nuclear processes in stellar environments.

doi: 10.1103/PhysRevLett.127.172702
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2018BA23      Phys.Rev. C 97, 065807 (2018)

P.Banerjee, G.W.Misch, S.K.Ghorui, Y.Sun

Effective stellar β-decay rates of nuclei with long-lived isomers: ²⁶Al and ³⁴Cl

RADIOACTIVITY ²⁶Al, ³⁴Cl(β⁺), (IT); calculated effective β-decay, and electromagnetic transition rates for ground states, isomeric states, and several low-spin excited states up to about 2.5 MeV at temperatures suitable for stellar environments; deduced time evolution of ²⁶Al abundance. Calculations used NUSHELLX and OXBASH shell model codes with USDB interaction. Comparison with available experimental values from the ENSDF database, and with other theoretical calculations.

doi: 10.1103/PhysRevC.97.065807
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2018MI01      Astrophys.J. 852, 43 (2018)

G.W.Misch, Y.Sun, G.M.Fuller

Neutrino Spectra from Nuclear Weak Interactions in sd-Shell Nuclei under Astrophysical Conditions

NUCLEAR STRUCTURE A=21-35; calculated electron- and positron-capture spectra, isospin-raising reaction neutrino spectra at a temperature and density typical of early core collapse.

doi: 10.3847/1538-4357/aa9c41
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2016MI26      Phys.Rev. C 94, 055808 (2016)

G.W.Misch, G.M.Fuller

Nuclear neutrino energy spectra in high temperature astrophysical environments

NUCLEAR STRUCTURE ^27,28Si, ³¹S, ^30,32P, ^27,28Al, ⁵⁶Fe; calculated charged current process neutrino spectra in high temperature astrophysical environments for electron capture and positron decays from ground and excited states calculated from shell-model calculations. ^21,22Ne, ²⁵Mg, ^28,30Si, ^27,28Al, ³¹P, ^34,36S; calculated neutrino pair emissivities as a function of temperature. ²⁷Al, ²⁸Si; calculated neutral current neutrino and antineutrino spectra, energy-loss rates from neutral current deexcitation of ²⁷Al and electron capture on ²⁸Si.

doi: 10.1103/PhysRevC.94.055808
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2014MI24      Phys.Rev. C 90, 065808 (2014)

G.W.Misch, G.M.Fuller, B.A.Brown

Modification of the Brink-Axel hypothesis for high-temperature nuclear weak interactions

NUCLEAR STRUCTURE ²⁸Si, ^24,28Mg; calculated B(GT) distributions as a function of excitation energy up to 50 MeV, electron capture rates for ²⁸Si as a function of electron Fermi energy and temperature. Failure of Brink-Axel hypothesis at high initial excitation energies, and proposed its modifications. Shell-model calculations.

doi: 10.1103/PhysRevC.90.065808
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2013MI15      Phys.Rev. C 88, 015807 (2013)

G.W.Misch, B.A.Brown, G.M.Fuller

Neutrino-pair emission from hot nuclei during stellar collapse

NUCLEAR STRUCTURE ²⁸Si, ⁴⁷Ti, ⁵⁶Fe; calculated neutrino-antineutrino emission transition strength B(GT), energy loss as function of temperature and excitation energy, density of states as function of excitation energy. Shell-model calculations. Effect of residual interaction-induced configuration mixing on B(GT), energy of neutrino pairs, and entropy transport in supernovae.

doi: 10.1103/PhysRevC.88.015807
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