TheNd<mml:mprescripts/><mml:none/>150(He<mml:mprescripts/><mml:none/>3,t) andSm<mml:mprescripts/><mml:none/>150(t,He<mml:mprescripts/><mml:none/>3) reactions with applications toββdecay ofNd<mml:mprescripts/><mml:none/>150

2011/05/03 by C. J. Guess, T. Adachi, H. Akimune +47 · 2 citations
Physics and Astronomy · #Atomic physics #Excited state #Multipole expansion #Neutrino #Neutrino Physics Research #Nuclear physics #Nuclear physics research studies #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevc.83.064318

18 pages, 13 figures, 2 tables

arxiv created 2011/05/03 · openalex publication_date 2011/06/17 · arxiv updated 2015/05/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

The ¹⁵⁰Nd(³He,t) reaction at 140 MeV/u and ¹⁵⁰Sm(t,³He) reaction at 115 MeV/u were measured, populating excited states in ¹⁵⁰Pm. The transitions studied populate intermediate states of importance for the (neutrinoless) \ensuremathβ\ensuremathβ decay of ¹⁵⁰Nd to ¹⁵⁰Sm. Monopole and dipole contributions to the measured excitation-energy spectra were extracted by using multipole decomposition analyses. The experimental results were compared with theoretical calculations obtained within the framework of the quasiparticle random-phase approximation, which is one of the main methods employed for estimating the half-life of the neutrinoless \ensuremathβ\ensuremathβ decay (0\ensuremathν\ensuremathβ\ensuremathβ) of ¹⁵⁰Nd. The present results thus provide useful information on the neutrino responses for evaluating the 0\ensuremathν\ensuremathβ\ensuremathβ and 2\ensuremathν\ensuremathβ\ensuremathβ matrix elements. The 2\ensuremathν\ensuremathβ\ensuremathβ matrix element calculated from the Gamow-Teller transitions through the lowest 1⁺ state in the intermediate nucleus is maximally about half that deduced from the half-life measured in 2\ensuremathν\ensuremathβ\ensuremathβ direct counting experiments, and at least several transitions through 1⁺ intermediate states in ¹⁵⁰Pm are required to explain the 2\ensuremathν\ensuremathβ\ensuremathβ half-life. Because Gamow-Teller transitions in the ¹⁵⁰Sm(t,³He) experiment are strongly Pauli blocked, the extraction of Gamow-Teller strengths was complicated by the excitation of the 2\ensuremathℏ\ensuremathω, \ensuremathΔL=0, \ensuremathΔS=1 isovector spin-flip giant monopole resonance (IVSGMR). However, the near absence of Gamow-Teller transition strength made it possible to cleanly identify this resonance, and the strength observed is consistent with the full exhaustion of the non-energy-weighted sum rule for the IVSGMR.

Citations

• Nuclear Structure Relevant to Neutrinoless DoubleβDecay:Ge<mml:mprescripts/><mml:none/>76andSe<mml:mprescripts/><mml:none/>76
• Double Beta-Disintegration
• Extraction of Weak Transition Strengths via the (He<mml:mprescripts/><mml:none/>3,t) Reaction at 420 MeV
• Theory of neutrinos: a white paper
• The (t,He<mml:mprescripts/><mml:none/>3) and (He<mml:mprescripts/><mml:none/>3,t) reactions as probes of Gamow-Teller strength
• Gamow-Teller transitions toCu<mml:mprescripts/><mml:none/>64measured with theZn<mml:mprescripts/><mml:none/>64(t,He<mml:mprescripts/><mml:none/>3) reaction

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