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1. A search for double-electron capture in 74Se using coincidence/anticoincidence gamma-ray spectrometry

Author

Jeskovsky, M., Frekers, D., Kovacik, A., Povinec, P. P., Puppe, P., Stanicek, J., Sykora, I., Simkovic, F., and Thies, J. H.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

Evaluation of single, coincidence and anticoincidence gamma-ray spectrometry methods has been carried out with the aim to search for double-electron capture in 74Se. This process is unique, because there is probability for transition to the 2+ excited state in 74Ge (1204 keV), and de-excitation through two gamma-quanta cascade with energies of 595.9 keV and 608.4 keV. Long-term measurements with anticosmic shielded HPGe spectrometer and the coincidence HPGe-NaI(Tl) spectrometer did not show any evidence for the double-electron capture in 74Se. The best limit for the half-life of the double electron capture in 74Se (both for the neutrinoless and two neutrino processes) was estimated to be >1.5x10E19 years., Comment: 11 pages, 3 tables, 5 figures

Published
2015
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2. Dipole polarizability of 120Sn and nuclear energy density functionals

Author

Hashimoto, T., Krumbholz, A. M., Reinhard, P. -G., Tamii, A., von Neumann-Cosel, P., Adachi, T., Aoi, N., Bertulani, C. A., Fujita, H., Fujita, Y., Ganioǧlu, E., Hatanaka, K., Iwamoto, C., Kawabata, T., Khai, N. T., Krugmann, A., Martin, D., Matsubara, H., Miki, K., Neveling, R., Okamura, H., Ong, H. J., Poltoratska, I., Ponomarev, V. Yu., Richter, A., Sakaguchi, H., Shimbara, Y., Shimizu, Y., Simonis, J., Smit, F. D., Süsoy, G., Thies, J. H., Suzuki, T., Yosoi, M., and Zenihiro, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The electric dipole strength distribution in 120Sn between 5 and 22 MeV has been determined at RCNP Osaka from a polarization transfer analysis of proton inelastic scattering at E_0 = 295 MeV and forward angles including 0{\deg}. Combined with photoabsorption data an electric dipole polarizability \alpha_D(120Sn) = 8.93(36) fm^3 is extracted. The dipole polarizability as isovector observable par excellence carries direct information on the nuclear symmetry energy and its density dependence. The correlation of the new value with the well established \alpha_D(208Pb) serves as a test of its prediction by nuclear energy density functionals (EDFs). Models based on modern Skyrme interactions describe the data fairly well while most calculations based on relativistic Hamiltonians cannot., Comment: 6 pages, 4 figures

Published
2015
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3. Low-energy electric dipole response in 120Sn

Author

Krumbholz, A. M., von Neumann-Cosel, P., Hashimoto, T., Tamii, A., Adachi, T., Bertulani, C. A., Fujita, H., Fujita, Y., Ganioglu, E., Hatanaka, K., Iwamoto, C., Kawabata, T., Khai, N. T., Krugmann, A., Martin, D., Matsubara, H., Neveling, R., Okamura, H., Ong, H. J., Poltoratska, I., Ponomarev, V. Yu., Richter, A., Sakaguchi, H., Shimbara, Y., Shimizu, Y., Simonis, J., Smit, F. D., Susoy, G., Thies, J. H., Suzuki, T., Yosoi, M., and Zenihiro, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The electric dipole strength in 120Sn has been extracted from proton inelastic scattering experiments at E_p = 295 MeV and at forward angles including 0 degree. Below neutron threshoild it differs from the results of a 120Sn(gamma,gamma') experiment and peaks at an excitation energy of 8.3 MeV. The total strength corresponds to 2.3(2)% of the energy-weighted sum rule and is more than three times larger than what is observed with the (gamma,gamma') reaction. This implies a strong fragmentation of the E1 strength and/or small ground state branching ratios of the excited 1- states., Comment: 7 pages, 6 figures

Published
2015
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4. The $^{150}$Nd($^3$He,$t$) and $^{150}$Sm($t$,$^3$He) reactions with applications to $\beta\beta$ decay of $^{150}$Nd

Author

Guess, C. J., Adachi, T., Akimune, H., Algora, A., Austin, Sam M., Bazin, D., Brown, B. A., Caesar, C., Deaven, J. M., Ejiri, H., Estevez, E., Fang, D., Faessler, A., Frekers, D., Fujita, H., Fujita, Y., Fujiwara, M., Grinyer, G. F., Harakeh, M. N., Hatanaka, K., Herlitzius, C., Hirota, K., Hitt, G. W., Ishikawa, D., Matsubara, H., Meharchand, R., Molina, F., Okamura, H., Ong, H. J., Perdikakis, G., Rodin, V., Rubio, B., Shimbara, Y., Süsoy, G., Suzuki, T., Tamii, A., Thies, J. H., Tur, C., Verhanovitz, N., Yosoi, M., Yurkon, J., Zegers, R. G. T., and Zenihiro, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The $^{150}$Nd($^3$He,$t$) reaction at 140 MeV/u and $^{150}$Sm($t$,$^3$He) reaction at 115 MeV/u were measured, populating excited states in $^{150}$Pm. The transitions studied populate intermediate states of importance for the (neutrinoless) $\beta\beta$ decay of $^{150}$Nd to $^{150}$Sm. 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 Quasiparticle Random-Phase Approximation (QRPA), which is one of the main methods employed for estimating the half-life of the neutrinoless $\beta\beta$ decay ($0\nu\beta\beta$) of $^{150}$Nd. The present results thus provide useful information on the neutrino responses for evaluating the $0\nu\beta\beta$ and $2\nu\beta\beta$ matrix elements. The $2\nu\beta\beta$ matrix element calculated from the Gamow-Teller transitions through the lowest $1^{+}$ state in the intermediate nucleus is maximally about half of that deduced from the half-life measured in $2\nu\beta\beta$ direct counting experiments and at least several transitions through $1^{+}$ intermediate states in $^{150}$Pm are required to explain the $2\nu\beta\beta$ half-life. Because Gamow-Teller transitions in the $^{150}$Sm($t$,$^3$He) experiment are strongly Pauli-blocked, the extraction of Gamow-Teller strengths was complicated by the excitation of the $2\hbar\omega$, $\Delta L=0$, $\Delta S=1$ 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., Comment: 18 pages, 13 figures, 2 tables

Published
2011
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6. Experimental study of Gamow-Teller transitions via the high-energy-resolution O18(He3,t)F18 reaction: Identification of the low-energy “super” -Gamow-Teller state

Author

Fujita, H., primary, Fujita, Y., additional, Utsuno, Y., additional, Yoshida, K., additional, Adachi, T., additional, Algora, A., additional, Csatlós, M., additional, Deaven, J. M., additional, Estevez-Aguado, E., additional, Guess, C. J., additional, Gulyás, J., additional, Hatanaka, K., additional, Hirota, K., additional, Hutton, R., additional, Ishikawa, D., additional, Krasznahorkay, A., additional, Matsubara, H., additional, Molina, F., additional, Okamura, H., additional, Ong, H. J., additional, Perdikakis, G., additional, Rubio, B., additional, Scholl, C., additional, Shimbara, Y., additional, Süsoy, G., additional, Suzuki, T., additional, Tamii, A., additional, Thies, J. H., additional, Zegers, R. G. T., additional, and Zenihiro, J., additional

Published
2019
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7. Experimental study of Gamow-Teller transitions via the high-energy-resolution O-18(He-3, t)F-18 reaction: Identification of the low-energy super -Gamow-Teller state

Author

Fujita, H., Fujita, Y., Utsuno, Y., Yoshida, K., Adachi, T., Algora, A., Csatlos, M., Deaven, J. M., Estevez-Aguado, E., Guess, C. J., Gulyas, J., Hatanaka, K., Hirota, K., Hutton, R., Ishikawa, D., Krasznahorkay, A., Matsubara, H., Molina, F., Okamura, H., Ong, H. J., Perdikakis, G., Rubio, B., Scholl, C., Shimbara, Y., Susoy, G., Suzuki, T., Tamii, A., Thies, J. H., Zegers, R. G. T., Zenihiro, J., Fujita, H., Fujita, Y., Utsuno, Y., Yoshida, K., Adachi, T., Algora, A., Csatlos, M., Deaven, J. M., Estevez-Aguado, E., Guess, C. J., Gulyas, J., Hatanaka, K., Hirota, K., Hutton, R., Ishikawa, D., Krasznahorkay, A., Matsubara, H., Molina, F., Okamura, H., Ong, H. J., Perdikakis, G., Rubio, B., Scholl, C., Shimbara, Y., Susoy, G., Suzuki, T., Tamii, A., Thies, J. H., Zegers, R. G. T., and Zenihiro, J.

Abstract

Using the high-resolution O-18(He-3, t)F-18 reaction at 0 degrees and at 140 MeV/nucleon, Gamow-Teller (GT) transitions were studied. A high energy resolution of 31 keV was achieved by applying dispersion matching techniques. The main part of the observed GT transition strength is concentrated in the transition to the F-18 ground state (g.s.). The absolute values of the reduced GT transition strengths, B(GT), were derived up to E-x = 12 MeV assuming proportionality between the B(GT) values and the reaction cross sections at 0 degrees. The B(GT) value obtained from the beta decay of F-18 (g.s.) -> O-18 (g.s.) was used to determine the proportionality constant. A total B(GT) of 4.06(5) was found and 76(1)% of the strength is concentrated to the ground state of F-18. The obtained B(GT) values were compared with those from the O-18(p, n) F-18 reaction and the mirror symmetric beta(+) decay of Ne-18 -> F-18. The candidates for 1(+) states with isospin T = 1 were identified by comparison with the O-18(p, p') data. The results of shell-model and quasiparticle-random-phase approximation calculations suggest constructive contributions of various configurations to the F-18 ground state, suggesting that this state is the low-energy super GT state.

Published
2019

8. 高分解能18O(^3He,t)18F反応によるガモフテラー遷移の研究; 低励起エネルギーの超ガモフテラー状態の同定

Author

Fujita, Hirohiko, Fujita, Yoshitaka, Utsuno, Yutaka, Yoshida, Kenichi, Adachi, Tatsuya, Algora, A., Csatl\'os, M., Deaven, J. M., Estevez-Aguado, E., Guess, C. J., Guly\'as, J., Hatanaka, Kichiji, Hirota, Kazuma, Hutton, R., Ishikawa, Daiki, Krasznahorkay, A., Matsubara, Hiroaki, Molina, F., Okamura, Hiroyuki, Ong, H. J., Perdikakis, G., Rubio, B., Scholl, C., Shimbara, Yoshihiro, S\\\'usoy, G., Suzuki, Tomokazu, Tamii, Atsushi, Thies, J. H., Zegers, R. G. T., and Zenihiro, Juzo

Abstract

大阪大学のリングサイクロトロンにて$^{18}$O($^3$He,$t$)$^{18}$F反応実験を行い、その荷電交換反応の断面積から、$^{18}\textrm{O}\to^{18}\textrm{F}$のガモフテラー遷移分布$B(\textrm{GT})$の励起エネルギー分布を測定した。その結果、$^{18}$Fの基底状態への$B(\textrm{GT})$が3.1と非常に大きく、その他の励起状態への遷移強度は小さいことがわかった。この実験結果を大規模殻模型計算や乱雑位相近似計算と比較し、基底状態への強い遷移が理論計算によってよく説明されることがわかった。

Published
2019

9. High-resolution study of Gamow-Teller transitions in the Ti-48(He-3,t)V-48 reaction

Author

Ganioglu, E., Fujita, H., Rubio, B., Fujita, Y., Adachi, T., Algora, A., Csatlos, M., Deaven, J. M., Estevez-Aguado, E., Guess, C. J., Gulyas, J., Hatanaka, K., Hirota, K., Honma, M., Ishikawa, D., Krasznahorkay, A., Matsubara, H., Meharchand, R., Molina, F., Okamura, H., Ong, H. J., Otsuka, T., Perdikakis, G., Scholl, C., Shimbara, Y., Susoy, G., Suzuki, T., Tamii, A., Thies, J. H., Zegers, R. G. T., Zenihiro, J., Ganioglu, E., Fujita, H., Rubio, B., Fujita, Y., Adachi, T., Algora, A., Csatlos, M., Deaven, J. M., Estevez-Aguado, E., Guess, C. J., Gulyas, J., Hatanaka, K., Hirota, K., Honma, M., Ishikawa, D., Krasznahorkay, A., Matsubara, H., Meharchand, R., Molina, F., Okamura, H., Ong, H. J., Otsuka, T., Perdikakis, G., Scholl, C., Shimbara, Y., Susoy, G., Suzuki, T., Tamii, A., Thies, J. H., Zegers, R. G. T., and Zenihiro, J.

Abstract

In this work we have studied T-z = +2 -> +1, Gamow-Teller (GT) transitions in the Ti-48(He-3, t)V-48 chargeexchange reaction at 140 MeV/nucleon and 0 degrees at the Research Center for Nuclear Physics, Osaka. From the high-resolution facility, consisting of a high-dispersion beamline and the Grand Raiden spectrometer, the spectrum had an energy resolution of 21 keV, among the best achieved. Individual GT transitions were observed and GT strength was derived for each state populated up to an excitation energy of 12 MeV. The total sum of the B(GT) strength observed in discrete states was 4.0, which is 33% of the sum-rule-limit value of 12. The results were compared with the results of shell-model calculations carried out with the GXPF1J interaction. The measured B(GT) distribution was also compared with that obtained in the (He-3, t) charge-exchange reaction on Ti-47. On the assumption of isospin symmetry the beta spectrum of the T-z = -2 nucleus Fe-48 was deduced from the observed spectrum in the Ti-48(He-3, t)V-48 reaction and this predicted spectrum was compared with the measured one.

Published
2016

10. High-resolution study of Gamow-Teller transitions in theTi48(He3,t)V48reaction

Author

Ganioğlu, E., primary, Fujita, H., additional, Rubio, B., additional, Fujita, Y., additional, Adachi, T., additional, Algora, A., additional, Csatlós, M., additional, Deaven, J. M., additional, Estevez-Aguado, E., additional, Guess, C. J., additional, Gulyás, J., additional, Hatanaka, K., additional, Hirota, K., additional, Honma, M., additional, Ishikawa, D., additional, Krasznahorkay, A., additional, Matsubara, H., additional, Meharchand, R., additional, Molina, F., additional, Okamura, H., additional, Ong, H. J., additional, Otsuka, T., additional, Perdikakis, G., additional, Scholl, C., additional, Shimbara, Y., additional, Susoy, G., additional, Suzuki, T., additional, Tamii, A., additional, Thies, J. H., additional, Zegers, R. G. T., additional, and Zenihiro, J., additional

Published
2016
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11. The Ga-71(He-3, t) reaction and the low-energy neutrino response

Author

Frekers, D., Ejiri, H., Akimune, H., Adachi, T., Bilgier, B., Brown, B. A., Cleveland, B. T., Fujita, H., Fujita, Y., Fujiwara, M., Ganioglu, E., Gavrin, V. N., Grewe, E. -W., Guess, C. J., Harakeh, M. N., Hatanaka, K., Hodak, R., Holl, M., Iwamoto, C., Khai, N. T., Kozer, H. C., Lennarz, A., Okamoto, A., Okamura, H., Povinec, P. P., Puppe, P., Simkovic, F., Susoy, G., Suzuki, T., Tamii, A., Thies, J. H., Van de Walle, J., Zegers, R. G. T., and KVI - Center for Advanced Radiation Technology

Subjects
GALLEX, P,N REACTION, Solar neutrinos, ELECTRON-CAPTURE DECAY, Charge-exchange reaction, INTERNAL BREMSSTRAHLUNG, PF-SHELL NUCLEI, Gamow-Teller strength, CROSS-SECTIONS, SCATTERING, Neutrino cross section, SPECTROMETER GRAND RAIDEN, INTERMEDIATE ENERGIES, HE-3,T REACTIONS
Abstract

A Ga-71(He-3,t)Ge-71 charge-exchange experiment was performed to extract with high precision the Gamow-Teller (GT) transition strengths to the three lowest-lying states in Ge-71, i.e., the ground state (1/2(-)), the 175 keV (5/2(-)) and the 500 key (3/2(-)) excited states. These are the relevant states, which are populated via a charged-current reaction induced by neutrinos from reactor-produced Cr-51 and Ar-37 sources. A precise measurement of the GT transition strengths is an important input into the calibration of the SAGE and GALLEX solar neutrino detectors and addresses a long-standing discrepancy between the measured and evaluated capture rates from the Cr-51 and Ar-37 neutrino calibration sources, which has recently spawned new ideas about unconventional neutrino properties. (C) 2011 Elsevier B.V. All rights reserved.

Published
2011

12. High-resolution (He-3,t) reaction on the double-beta decaying nucleus Xe-136

Author

Puppe, P., Frekers, D., Adachi, T., Akimune, H., Aoi, N., Bilgier, B., Ejiri, H., Fujita, H., Fujita, Y., Fujiwara, M., Ganioglu, E., Harakeh, M. N., Hatanaka, K., Holl, M., Kozer, H. C., Lee, J., Lennarz, A., Matsubara, H., Miki, K., Orrigo, S. E. A., Suzuki, T., Tamii, A., Thies, J. H., and KVI - Center for Advanced Radiation Technology

Subjects
MATRIX-ELEMENTS, NEUTRINO MASSES, SEARCH, STRENGTH, SCATTERING, BEAM, SPECTROMETER GRAND RAIDEN, INTERMEDIATE ENERGIES, MAGNETIC SPECTROMETER, RESPONSES
Abstract

A (He-3, t) charge-exchange reaction experiment on the double-beta decaying nucleus Xe-136 has been performed at an incident energy of 420 MeV with the objective to measure the Gamow-Teller (GT) strength distribution in Cs-136. The measurements have been carried out at the dispersion-matched WS beam line and the Grand Raiden spectrometer of the Research Center for Nuclear Physics in Osaka, where an energy resolution of 42 keV was achieved. A new gas cell with thin windows made of polyethylene naphthalate has been employed as a target. The extracted GT strength distribution is confronted with the rather long 2 nu beta beta decay half-life of Xe-136.

Published
2011

13. The Nd-150(He-3,t) and Sm-150(t,He-3) reactions with applications to beta beta decay of Nd-150

Author

Guess, C. J., Adachi, T., Akimune, H., Algora, A., Austin, Sam M., Bazin, D., Brown, B. A., Caesar, C., Deaven, J. M., Ejiri, H., Estevez, E., Fang, D., Faessler, A., Frekers, D., Fujita, H., Fujita, Y., Fujiwara, M., Grinyer, G. F., Harakeh, M. N., Hatanaka, K., Herlitzius, C., Hirota, K., Hitt, G. W., Ishikawa, D., Matsubara, H., Meharchand, R., Molina, F., Okamura, H., Ong, H. J., Perdikakis, G., Rodin, V., Rubio, B., Shimbara, Y., Suesoy, G., Suzuki, T., Tamii, A., Thies, J. H., Tur, C., Verhanovitz, N., Yosoi, M., Yurkon, J., Zegers, R. G. T., Zenihiro, J., and KVI - Center for Advanced Radiation Technology

Subjects
GAMOW-TELLER STRENGTH, NEUTRINOS, Nuclear Theory, SCATTERING, CHARGE-EXCHANGE REACTIONS, NUCLEAR-MATRIX-ELEMENTS, FRAGMENTATION, SPECTROMETER GRAND RAIDEN, INTERMEDIATE ENERGIES, RESONANCES, DISINTEGRATION
Abstract

The Nd-150(3He,t) reaction at 140 MeV/u and Sm-150(t,He-3) reaction at 115 MeV/u were measured, populating excited states in Pm-150. The transitions studied populate intermediate states of importance for the (neutrinoless) beta beta decay of Nd-150 to Sm-150. 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 beta beta decay (0 nu beta beta) of Nd-150. The present results thus provide useful information on the neutrino responses for evaluating the 0 nu beta beta and 2 nu beta beta matrix elements. The 2 nu beta beta 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 nu beta beta direct counting experiments, and at least several transitions through 1+ intermediate states in Pm-150 are required to explain the 2 nu beta beta half-life. Because Gamow-Teller transitions in the Sm-150(t,3He) experiment are strongly Pauli blocked, the extraction of Gamow-Teller strengths was complicated by the excitation of the 2 (h) over bar omega, Lambda L = 0, Delta S = 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.

Published
2011

14. High-resolution study of Gamow-Teller excitations in the Ca-42(He-3,t)Sc-42 reaction and the observation of a low-energy super-Gamow-Teller state

Author

Fujita, Y., Fujita, H., Adachi, T., Susoy, G., Algora, A., Bai, C. L., Colo, G., Csatlos, M., Deaven, J. M., Estevez-Aguado, E., Guess, C. J., Gulyas, J., Hatanaka, K., Hirota, K., Honma, M., Ishikawa, D., Krasznahorkay, A., Matsubara, H., Meharchand, R., Molina, F., Nakada, H., Okamura, H., Ong, H. J., Otsuka, T., Perdikakis, G., Rubio, B., Sagawa, H., Sarriguren, P., Scholl, C., Shimbara, Y., Stephenson, E. J., Suzuki, T., Tamii, A., Thies, J. H., Yoshida, K., Zegers, R. G. T., Zenihiro, J., Fujita, Y., Fujita, H., Adachi, T., Susoy, G., Algora, A., Bai, C. L., Colo, G., Csatlos, M., Deaven, J. M., Estevez-Aguado, E., Guess, C. J., Gulyas, J., Hatanaka, K., Hirota, K., Honma, M., Ishikawa, D., Krasznahorkay, A., Matsubara, H., Meharchand, R., Molina, F., Nakada, H., Okamura, H., Ong, H. J., Otsuka, T., Perdikakis, G., Rubio, B., Sagawa, H., Sarriguren, P., Scholl, C., Shimbara, Y., Stephenson, E. J., Suzuki, T., Tamii, A., Thies, J. H., Yoshida, K., Zegers, R. G. T., and Zenihiro, J.

Abstract

To study the Gamow-Teller (GT) transitions from the T-z = +1 nucleus Ca-42 to the T-z = 0 nucleus Sc-42, where T-z is the z component of isospin T, we performed a (p, n)-type (He-3, t) charge-exchange reaction at 140 MeV/nucleon and scattering angles around 0 degrees. With an energy resolution of 29 keV, states excited by GT transitions (GT states) could be studied accurately. The reduced GT transition strengths B(GT) were derived up to the excitation energy of 13 MeV, assuming the proportionality between the cross sections at 0 degrees and B(GT) values. The main part of the observed GT transition strength is concentrated in the lowest 0.611-MeV, J(pi) = 1(+) GT state. All the other states at higher energies are weakly excited. Shell-model calculations could reproduce the gross feature of the experimental B(GT) distribution, and random-phase-approximation calculations including an attractive isoscalar interaction showed that the 0.611-MeV state has a collective nature. It was found that this state has all of the properties of a low-energy super-Gamow-Teller state. It is expected that low-lying J(pi) = 1(+) GT states have T = 0 in the T-z = 0 nucleus Sc-42. However, T = 1 states are situated in a higher energy region. Assuming an isospin-analogous structure in A = 42 isobars, analogous T = 1, 1(+) states are also expected in Ca-42. Comparing the Ca-42(He-3, t)Sc-42 and Ca-42(p, p') spectra measured at 0 degrees, candidates for T = 1 GT states could be found in the 10-12-MeV region of Sc-42. They were all weakly excited. The mass dependence of the GT strength distributions in Sc isotopes is also discussed.

Published
2015

15. Dipole polarizability ofSn120and nuclear energy density functionals

Author

Hashimoto, T., primary, Krumbholz, A. M., additional, Reinhard, P.-G., additional, Tamii, A., additional, von Neumann-Cosel, P., additional, Adachi, T., additional, Aoi, N., additional, Bertulani, C. A., additional, Fujita, H., additional, Fujita, Y., additional, Ganioǧlu, E., additional, Hatanaka, K., additional, Ideguchi, E., additional, Iwamoto, C., additional, Kawabata, T., additional, Khai, N. T., additional, Krugmann, A., additional, Martin, D., additional, Matsubara, H., additional, Miki, K., additional, Neveling, R., additional, Okamura, H., additional, Ong, H. J., additional, Poltoratska, I., additional, Ponomarev, V. Yu., additional, Richter, A., additional, Sakaguchi, H., additional, Shimbara, Y., additional, Shimizu, Y., additional, Simonis, J., additional, Smit, F. D., additional, Süsoy, G., additional, Suzuki, T., additional, Thies, J. H., additional, Yosoi, M., additional, and Zenihiro, J., additional

Published
2015
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16. Low-Energy Super Gamow-Teller State

Author

Fujita, Y., primary, Fujita, H., additional, Adachi, T., additional, Bai, C. L., additional, Algora, A., additional, Berg, G. P. A., additional, von Brentano, P., additional, Colò, G., additional, Csatlós, M., additional, Deaven, J. M., additional, Estevez-Aguado, E., additional, Fransen, C., additional, De Frenne, D., additional, Fujita, K., additional, Ganioğlu, E., additional, Guess, C. J., additional, Gulyás, J., additional, Hatanaka, K., additional, Hirota, K., additional, Honma, M., additional, Ishikawa, D., additional, Jacobs, E., additional, Krasznahorkay, A., additional, Matsubara, H., additional, Matsuyanagi, K., additional, Meharchand, R., additional, Molina, F., additional, Muto, K., additional, Nakanishi, K., additional, Negret, A., additional, Okamura, H., additional, Ong, H. J., additional, Otsuka, T., additional, Pietralla, N., additional, Perdikakis, G., additional, Popescu, L., additional, Rubio, B., additional, Sagawa, H., additional, Sarriguren, P., additional, Scholl, C., additional, Shimbara, Y., additional, Shimizu, Y., additional, Susoy, G., additional, Suzuki, T., additional, Tameshige, Y., additional, Tamii, A., additional, Thies, J. H., additional, Uchida, M., additional, Wakasa, T., additional, Yosoi, M., additional, Zegers, R. G. T., additional, Zell, K. O., additional, and Zenihiro, J., additional

Published
2015
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17. High-resolution study of Gamow-Teller excitations in theCa42(He3,t)Sc42reaction and the observation of a “low-energy super-Gamow-Teller state”

Author

Fujita, Y., primary, Fujita, H., additional, Adachi, T., additional, Susoy, G., additional, Algora, A., additional, Bai, C. L., additional, Colò, G., additional, Csatlós, M., additional, Deaven, J. M., additional, Estevez-Aguado, E., additional, Guess, C. J., additional, Gulyás, J., additional, Hatanaka, K., additional, Hirota, K., additional, Honma, M., additional, Ishikawa, D., additional, Krasznahorkay, A., additional, Matsubara, H., additional, Meharchand, R., additional, Molina, F., additional, Nakada, H., additional, Okamura, H., additional, Ong, H. J., additional, Otsuka, T., additional, Perdikakis, G., additional, Rubio, B., additional, Sagawa, H., additional, Sarriguren, P., additional, Scholl, C., additional, Shimbara, Y., additional, Stephenson, E. J., additional, Suzuki, T., additional, Tamii, A., additional, Thies, J. H., additional, Yoshida, K., additional, Zegers, R. G. T., additional, and Zenihiro, J., additional

Published
2015
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18. The (d,(2)He) reaction on (76)Se and the double-beta-decay matrix elements for A=76

Author

Grewe, E. -W., Baeumer, C., Dohmann, H., Frekers, D., Harakeh, M. N., Hollstein, S., Johansson, H., Popescu, L., Savran, D., Simon, H., Thies, J. H., van den Berg, A. M., Zilges, A., Wortche, Heinrich, KVI - Center for Advanced Radiation Technology, Research unit Nuclear & Hadron Physics, and Research unit Astroparticle Physics

Subjects
GAMOW-TELLER STRENGTH, AGOR, GE-76, NUCLEI, Nuclear Theory, DETECTORS, SCATTERING, SPECTROMETER, Nuclear Experiment, OPERATOR EXPANSION METHOD, INTERMEDIATE ENERGIES, SYSTEM
Abstract

The (d,(2)He) charge-exchange reaction on (76)Se was studied at an incident energy of 183 MeV. The outgoing two protons in the (1)S(0) state, referred to as (2)He, were both momentum analyzed and detected by the same spectrometer and detector. The experiment was performed at KVI, Groningen, using the magnetic spectrometer BBS at three angular positions: 0(degrees),2.5(degrees), and 5(degrees). Excitation-energy spectra of the residual nucleus (76)As were obtained with an energy resolution of about 120 keV (FWHM). Gamow-Teller (GT(+)) transition strengths were extracted up to 5 MeV and compared with those from an (n,p) experiment at low resolution. Together with the GT(-) transition strengths from the (76)Ge(p,n) experiment leading to the same intermediate nucleus, the nuclear matrix element of the two-neutrino double-beta decay of (76)Ge was evaluated.

Published
2008

19. Gamow-Teller transitions in the A=40 isoquintet of relevance for neutrino captures in Ar-40

Author

Karakoc, M., Zegers, R. G. T., Brown, B. A., Fujita, Y., Adachi, T., Boztosun, I., Fujita, H., Csatlos, M., Deaven, J. M., Guess, C. J., Gulyas, J., Hatanaka, K., Hirota, K., Ishikawa, D., Krasznahorkay, A., Matsubara, H., Meharchand, R., Molina, F., Okamura, H., Ong, H. J., Perdikakis, G., Scholl, C., Shimbara, Y., Susoy, G., Suzuki, T., Tamii, A., Thies, J. H., Zenihiro, J., Karakoc, M., Zegers, R. G. T., Brown, B. A., Fujita, Y., Adachi, T., Boztosun, I., Fujita, H., Csatlos, M., Deaven, J. M., Guess, C. J., Gulyas, J., Hatanaka, K., Hirota, K., Ishikawa, D., Krasznahorkay, A., Matsubara, H., Meharchand, R., Molina, F., Okamura, H., Ong, H. J., Perdikakis, G., Scholl, C., Shimbara, Y., Susoy, G., Suzuki, T., Tamii, A., Thies, J. H., and Zenihiro, J.

Abstract

Background: The Gamow-Teller response of Ar-40 is important for the use of liquid argon as a medium for neutrino detection. An ambiguity about the Gamow-Teller strength for the excitation of 1(+) states at 2290 and 2730 keV in K-40 results in a significant uncertainty for neutrino capture rates. This ambiguity is caused by the large discrepancy observed between strengths extracted from Ar-40(p, n) charge-exchange data and the transition strengths for the analog transitions studied in the beta decay of Ti-40. Purpose: This study was aimed at resolving the ambiguity between the results from the Ar-40(p, n) charge-exchange and Ti-40 beta-decay data. Method: Shell-model calculations in the sd-pf shell with a new interaction (WBMB-C) were used to study differences between the structure of the transitions from Ar-40 and Ti-40. Distorted-wave Born approximation reaction calculations were used to investigate uncertainties in the extraction of Gamow-Teller strength from the Ar-40(p, n) data. New high-resolution data for the Ar-40(He-3,t) reaction were used to gain further insight into the charge-exchange reaction mechanism and to provide more information to test the validity of the shell-model calculations. Results: The shell-model calculations showed that interference between amplitudes associated with pf and sd components to the low-lying Gamow-Teller transitions, in combination with a difference in Coulomb energy shifts for Ar-40 and Ti-40, can produce the differences on the scale of those observed between the Ar-40 charge-exchange and Ti-40 beta-decay data. In combination with the difference in nuclear penetrability of the (p, n) and (He-3,t) probes, the different contributions from amplitudes associated with transitions in the pf and sd shells are likely also responsible for the observed discrepancy between the ratio of the cross sections for the low-lying 1(+) states in the Ar-40(p, n) and Ar-40(He-3,t) data. Conclusions: On the basis of this study, it is recommended t

Published
2014

20. Observation of Low- and High-Energy Gamow-Teller Phonon Excitations in Nuclei

Author

Fujita, Y., Fujita, H., Adachi, T., Bai, C. L., Algora, A., Berg, G. P. A., von Brentano, P., Colo, G., Csatlos, M., Deaven, J. M., Estevez-Aguado, E., Fransen, C., De Frenne, D., Fujita, K., Ganioglu, E., Guess, C. J., Gulyas, J., Hatanaka, K., Hirota, K., Honma, M., Ishikawa, D., Jacobs, E., Krasznahorkay, A., Matsubara, H., Matsuyanagi, K., Meharchand, R., Molina, F., Muto, K., Nakanishi, K., Negret, A., Okamura, H., Ong, H. J., Otsuka, T., Pietralla, N., Perdikakis, G., Popescu, L., Rubio, B., Sagawa, H., Sarriguren, P., Scholl, C., Shimbara, Y., Shimizu, Y., Susoy, G., Suzuki, T., Tameshige, Y., Tamii, A., Thies, J. H., Uchida, M., Wakasa, T., Yosoi, M., Zegers, R. G. T., Zell, K. O., Zenihiro, J., Fujita, Y., Fujita, H., Adachi, T., Bai, C. L., Algora, A., Berg, G. P. A., von Brentano, P., Colo, G., Csatlos, M., Deaven, J. M., Estevez-Aguado, E., Fransen, C., De Frenne, D., Fujita, K., Ganioglu, E., Guess, C. J., Gulyas, J., Hatanaka, K., Hirota, K., Honma, M., Ishikawa, D., Jacobs, E., Krasznahorkay, A., Matsubara, H., Matsuyanagi, K., Meharchand, R., Molina, F., Muto, K., Nakanishi, K., Negret, A., Okamura, H., Ong, H. J., Otsuka, T., Pietralla, N., Perdikakis, G., Popescu, L., Rubio, B., Sagawa, H., Sarriguren, P., Scholl, C., Shimbara, Y., Shimizu, Y., Susoy, G., Suzuki, T., Tameshige, Y., Tamii, A., Thies, J. H., Uchida, M., Wakasa, T., Yosoi, M., Zegers, R. G. T., Zell, K. O., and Zenihiro, J.

Abstract

Gamow-Teller (GT) transitions in atomic nuclei are sensitive to both nuclear shell structure and effective residual interactions. The nuclear GT excitations were studied for the mass number A = 42, 46, 50, and 54 f-shell nuclei in (He-3, t) charge-exchange reactions. In the Ca-42 -> Sc-42 reaction, most of the GT strength is concentrated in the lowest excited state at 0.6 MeV, suggesting the existence of a low-energy GT phonon excitation. As A increases, a high-energy GT phonon excitation develops in the 6-11 MeV region. In the Fe-54 -> Co-54 reaction, the high-energy GT phonon excitation mainly carries the GT strength. The existence of these two GT phonon excitations are attributed to the 2 fermionic degrees of freedom in nuclei.

Published
2014

21. Gamow-Teller transitions in theA=40isoquintet of relevance for neutrino captures inAr40

Author

Karakoç, M., primary, Zegers, R. G. T., additional, Brown, B. A., additional, Fujita, Y., additional, Adachi, T., additional, Boztosun, I., additional, Fujita, H., additional, Csatlós, M., additional, Deaven, J. M., additional, Guess, C. J., additional, Gulyás, J., additional, Hatanaka, K., additional, Hirota, K., additional, Ishikawa, D., additional, Krasznahorkay, A., additional, Matsubara, H., additional, Meharchand, R., additional, Molina, F., additional, Okamura, H., additional, Ong, H. J., additional, Perdikakis, G., additional, Scholl, C., additional, Shimbara, Y., additional, Susoy, G., additional, Suzuki, T., additional, Tamii, A., additional, Thies, J. H., additional, and Zenihiro, J., additional

Published
2014
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22. Observation of Low- and High-Energy Gamow-Teller Phonon Excitations in Nuclei

Author

Fujita, Y., primary, Fujita, H., additional, Adachi, T., additional, Bai, C. L., additional, Algora, A., additional, Berg, G. P. A., additional, von Brentano, P., additional, Colò, G., additional, Csatlós, M., additional, Deaven, J. M., additional, Estevez-Aguado, E., additional, Fransen, C., additional, De Frenne, D., additional, Fujita, K., additional, Ganioğlu, E., additional, Guess, C. J., additional, Gulyás, J., additional, Hatanaka, K., additional, Hirota, K., additional, Honma, M., additional, Ishikawa, D., additional, Jacobs, E., additional, Krasznahorkay, A., additional, Matsubara, H., additional, Matsuyanagi, K., additional, Meharchand, R., additional, Molina, F., additional, Muto, K., additional, Nakanishi, K., additional, Negret, A., additional, Okamura, H., additional, Ong, H. J., additional, Otsuka, T., additional, Pietralla, N., additional, Perdikakis, G., additional, Popescu, L., additional, Rubio, B., additional, Sagawa, H., additional, Sarriguren, P., additional, Scholl, C., additional, Shimbara, Y., additional, Shimizu, Y., additional, Susoy, G., additional, Suzuki, T., additional, Tameshige, Y., additional, Tamii, A., additional, Thies, J. H., additional, Uchida, M., additional, Wakasa, T., additional, Yosoi, M., additional, Zegers, R. G. T., additional, Zell, K. O., additional, and Zenihiro, J., additional

Published
2014
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23. High-resolution study ofTz=+2→+1Gamow-Teller transitions in the44Ca(3He,t)44Sc reaction

Author

Fujita, Y., primary, Adachi, T., additional, Fujita, H., additional, Algora, A., additional, Blank, B., additional, Csatlós, M., additional, Deaven, J. M., additional, Estevez-Aguado, E., additional, Ganioğlu, E., additional, Guess, C. J., additional, Gulyás, J., additional, Hatanaka, K., additional, Hirota, K., additional, Honma, M., additional, Ishikawa, D., additional, Krasznahorkay, A., additional, Matsubara, H., additional, Meharchand, R., additional, Molina, F., additional, Okamura, H., additional, Ong, H. J., additional, Otsuka, T., additional, Perdikakis, G., additional, Rubio, B., additional, Scholl, C., additional, Shimbara, Y., additional, Stephenson, E. J., additional, Susoy, G., additional, Suzuki, T., additional, Tamii, A., additional, Thies, J. H., additional, Zegers, R. G. T., additional, and Zenihiro, J., additional

Published
2013
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24. High-resolution study of Gamow-Teller transitions in the47Ti(3He,t)47V reaction

Author

Ganioğlu, E., primary, Fujita, H., additional, Fujita, Y., additional, Adachi, T., additional, Algora, A., additional, Csatlós, M., additional, Deaven, J. M., additional, Estevez-Aguado, E., additional, Guess, C. J., additional, Gulyás, J., additional, Hatanaka, K., additional, Hirota, K., additional, Honma, M., additional, Ishikawa, D., additional, Krasznahorkay, A., additional, Matsubara, H., additional, Meharchand, R., additional, Molina, F., additional, Okamura, H., additional, Ong, H. J., additional, Otsuka, T., additional, Perdikakis, G., additional, Rubio, B., additional, Scholl, C., additional, Shimbara, Y., additional, Susoy, G., additional, Suzuki, T., additional, Tamii, A., additional, Thies, J. H., additional, Zegers, R. G. T., additional, and Zenihiro, J., additional

Published
2013
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25. High-resolution96Zr(3He,t) experiment and the matrix element for double-βdecay

Author

Thies, J. H., primary, Puppe, P., additional, Adachi, T., additional, Dozono, M., additional, Ejiri, H., additional, Frekers, D., additional, Fujita, H., additional, Fujita, Y., additional, Fujiwara, M., additional, Grewe, E.-W., additional, Hatanaka, K., additional, Heinrichs, P., additional, Ishikawa, D., additional, Khai, N. T., additional, Lennarz, A., additional, Matsubara, H., additional, Okamura, H., additional, Oo, Y. Y., additional, Ruhe, T., additional, Suda, K., additional, Tamii, A., additional, Yoshida, H. P., additional, and Zegers, R. G. T., additional

Published
2012
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26. High-resolution100Mo(3He,t)100Tc charge-exchange experiment and the impact on double-βdecays and neutrino charged-current reactions

Author

Thies, J. H., primary, Adachi, T., additional, Dozono, M., additional, Ejiri, H., additional, Frekers, D., additional, Fujita, H., additional, Fujita, Y., additional, Fujiwara, M., additional, Grewe, E.-W., additional, Hatanaka, K., additional, Heinrichs, P., additional, Ishikawa, D., additional, Khai, N. T., additional, Lennarz, A., additional, Matsubara, H., additional, Okamura, H., additional, Oo, Y. Y., additional, Puppe, P., additional, Ruhe, T., additional, Suda, K., additional, Tamii, A., additional, Yoshida, H. P., additional, and Zegers, R. G. T., additional

Published
2012
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27. High resolution (3He,t) experiment on the double-βdecaying nuclei128Te and130Te

Author

Puppe, P., primary, Lennarz, A., additional, Adachi, T., additional, Akimune, H., additional, Ejiri, H., additional, Frekers, D., additional, Fujita, H., additional, Fujita, Y., additional, Fujiwara, M., additional, Ganioğlu, E., additional, Grewe, E.-W., additional, Hatanaka, K., additional, Hodak, R., additional, Iwamoto, C., additional, Khai, N. T., additional, Okamoto, A., additional, Okamura, H., additional, Povinec, P. P., additional, Susoy, G., additional, Suzuki, T., additional, Tamii, A., additional, Thies, J. H., additional, and Yosoi, M., additional

Published
2012
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28. The (3He,t) reaction on76Ge, and the double-β-decay matrix element

Author

Thies, J. H., primary, Frekers, D., additional, Adachi, T., additional, Dozono, M., additional, Ejiri, H., additional, Fujita, H., additional, Fujita, Y., additional, Fujiwara, M., additional, Grewe, E.-W., additional, Hatanaka, K., additional, Heinrichs, P., additional, Ishikawa, D., additional, Khai, N. T., additional, Lennarz, A., additional, Matsubara, H., additional, Okamura, H., additional, Oo, Y. Y., additional, Puppe, P., additional, Ruhe, T., additional, Suda, K., additional, Tamii, A., additional, Yoshida, H. P., additional, and Zegers, R. G. T., additional

Published
2012
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29. High-resolution (3He,t) reaction on the double-βdecaying nucleus136Xe

Author

Puppe, P., primary, Frekers, D., additional, Adachi, T., additional, Akimune, H., additional, Aoi, N., additional, Bilgier, B., additional, Ejiri, H., additional, Fujita, H., additional, Fujita, Y., additional, Fujiwara, M., additional, Ganioğlu, E., additional, Harakeh, M. N., additional, Hatanaka, K., additional, Holl, M., additional, Kozer, H. C., additional, Lee, J., additional, Lennarz, A., additional, Matsubara, H., additional, Miki, K., additional, Orrigo, S. E. A., additional, Suzuki, T., additional, Tamii, A., additional, and Thies, J. H., additional

Published
2011
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30. TheNd150(He3,t) andSm150(t,He3) reactions with applications toββdecay ofNd150

Author

Guess, C. J., primary, Adachi, T., additional, Akimune, H., additional, Algora, A., additional, Austin, Sam M., additional, Bazin, D., additional, Brown, B. A., additional, Caesar, C., additional, Deaven, J. M., additional, Ejiri, H., additional, Estevez, E., additional, Fang, D., additional, Faessler, A., additional, Frekers, D., additional, Fujita, H., additional, Fujita, Y., additional, Fujiwara, M., additional, Grinyer, G. F., additional, Harakeh, M. N., additional, Hatanaka, K., additional, Herlitzius, C., additional, Hirota, K., additional, Hitt, G. W., additional, Ishikawa, D., additional, Matsubara, H., additional, Meharchand, R., additional, Molina, F., additional, Okamura, H., additional, Ong, H. J., additional, Perdikakis, G., additional, Rodin, V., additional, Rubio, B., additional, Shimbara, Y., additional, Süsoy, G., additional, Suzuki, T., additional, Tamii, A., additional, Thies, J. H., additional, Tur, C., additional, Verhanovitz, N., additional, Yosoi, M., additional, Yurkon, J., additional, Zegers, R. G. T., additional, and Zenihiro, J., additional

Published
2011
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31. The (d,2He) reaction onMo96and the double-βdecay matrix elements forZr96

Author

Dohmann, H., primary, Bäumer, C., additional, Frekers, D., additional, Grewe, E.-W., additional, Harakeh, M. N., additional, Hollstein, S., additional, Johansson, H., additional, Popescu, L., additional, Rakers, S., additional, Savran, D., additional, Simon, H., additional, Thies, J. H., additional, van den Berg, A. M., additional, Wörtche, H. J., additional, and Zilges, A., additional

Published
2008
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32. The (d,2He) reaction onSe76and the double-β-decay matrix elements forA=76

Author

Grewe, E.-W., primary, Bäumer, C., additional, Dohmann, H., additional, Frekers, D., additional, Harakeh, M. N., additional, Hollstein, S., additional, Johansson, H., additional, Popescu, L., additional, Rakers, S., additional, Savran, D., additional, Simon, H., additional, Thies, J. H., additional, van den Berg, A. M., additional, Wörtche, H. J., additional, and Zilges, A., additional

Published
2008
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33. Studies on the double-β decay nucleusZn64using the (d,He2) reaction

Author

Grewe, E.-W., primary, Bäumer, C., additional, Dohmann, H., additional, Frekers, D., additional, Harakeh, M. N., additional, Hollstein, S., additional, Johansson, H., additional, Langanke, K., additional, Martínez-Pinedo, G., additional, Nowacki, F., additional, Petermann, I., additional, Popescu, L., additional, Rakers, S., additional, Savran, D., additional, Sieja, K., additional, Simon, H., additional, Thies, J. H., additional, Berg, A. M. van den, additional, Wörtche, H. J., additional, and Zilges, A., additional

Published
2008
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34. High-resolution 96Zr(3He,t) experiment and the matrix element for double-ß decay.

Author

Thies, J. H., Puppe, P., Adachi, T., Dozono, M., Ejiri, H., Frekers, D., Fujita, H., Fujita, Y., Fujiwara, M., Grewe, E.-W., Hatanaka, K., Heinrichs, P., Ishikawa, D., Khai, N. T., Lennarz, A., Matsubara, H., Okamura, H., Oo, Y. Y., Ruhe, T., and Suda, K.

Subjects
*ZIRCONIUM isotopes, *PHYSICS experiments, *RADIOACTIVE decay, *DISTRIBUTION (Probability theory), *NUCLEAR matrix, *HIGH resolution spectroscopy
Abstract

The Gamow-Teller (GT) strength distribution has been investigated in a high-resolution (3He,t) charge-exchange experiment on the double-beta (ßß) decaying nucleus 96Zr. The experiment was carried out at the Osaka University Research Center for Nuclear Physics (RCNP) with a 420 MeV incident 3He beam and the Grand Raiden magnetic spectrometer. A final-state energy resolution of 32 keV was achieved. A large fraction of the low-energy GT- strength is identified in a single state at 694 keV. A similar observation has been made in a 96Mo(d,2He)96Nb experiment at 120 keV resolution for the GT+ strength. It is found that this single state makes up nearly 100% of the nuclear matrix element for the 96Zr two-neutrino double-beta (2vßß) decay. [ABSTRACT FROM AUTHOR]

Published
2012
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35. High-resolution 100Mo(³He,t)100Tc charge-exchange experiment and the impact on double-β decays and neutrino charged-current reactions.

Author

Thies, J. H., Adachi, T., Dozono, M., Ejiri, H., Frekers, D., Fujita, H., Fujita, Y., Fujiwara, M., Grewe, E.-W., Hatanaka, K., Heinrichs, P., Ishikawa, D., Khai, N. T., Lennarz, A., Matsubara, H., Okamura, H., Oo, Y. Y., Puppe, P., Ruhe, T., and Suda, K.

Subjects
*MOLYBDENUM isotopes, *PHYSICS experiments, *CHARGE exchange, *DOUBLE beta decay, *MAGNETIC spectrometer, *GROUND state (Quantum mechanics), *PHASE transitions
Abstract

The Gamow-Teller (GT) strength distribution has been investigated in a high-resolution (³He,t) charge-exchange experiment on the double-beta (ββ) decaying nucleus 100Mo. The experiment was carried out at the Osaka University Research Center for Nuclear Physics (RCNP) with a 420 MeV incident³He beam and the Grand Raiden magnetic spectrometer. A final-state energy resolution of 33 keV was achieved. It was found that nearly the entire low-energy (up to ≈ 4 MeV) GT- strength is concentrated in the ground-state transition to 100Tc, which is interpreted as a result of the particular neutron and proton sub-shell occupancies. The impact on the matrix elements for the two-neutrino double-beta (2vββ) decay and the use of 100Mo as a neutrino detection material is discussed. [ABSTRACT FROM AUTHOR]

Published
2012
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36. The (3He,t) reaction on 76Ge, and the double-β-decay matrix element.

Author

Thies, J. H., Frekers, D., Adachi, T., Dozono, M., Ejiri, H., Fujita, H., Fujita, Y., Fujiwara, M., Grewe, E.-W., Hatanaka, K., Heinrichs, P., Ishikawa, D., Khai, N. T., Lennarz, A., Matsubara, H., Okamura, H., Oo, Y. Y., Puppe, P., Ruhe, T., and Suda, K.

Subjects
*NUCLEAR matrix, *CELL nuclei, *POTENTIAL barrier, *RADIOACTIVE decay, *NUCLEAR reactions
Abstract

A 76Ge(³He,t)76As charge-exchange experiment at an incident energy of 420 MeV has been performed with an energy resolution of 30 keV. The Gamow-Teller GT- strength distribution in 76As, which is the intermediate nucleus in the double-beta (ββ) decay of 76Ge, has been extracted. An unusually strong fragmentation of the GT- strength is observed even at low excitation energies of Ex ⩽ 5 MeV. By combining the data with those for GT+ transitions from a recent 76Se(d,²He)76As measurement, the nuclear matrix element for the 76Ge 2νββ decay has been evaluated. A lack of correlation among the GT transition strengths feeding the same levels from the two different directions is observed. The impact on the 76Ge 2νββ decay nuclear matrix element is discussed. [ABSTRACT FROM AUTHOR]

Published
2012
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37. High resolution (3He,t) reaction on the double-beta decaying nucleus 136Xe

Author

Puppe, P., Frekers, D., Tatsuya Adachi, Akimune, H., Aoi, N., Bilgier, B., Ejiri, H., Fujita, H., Fujita, Y., Fujiwara, M., Ganio, E., Muhsin N. Harakeh, Hatanaka, K., Holl, M., Kozer, H. C., Lee, J., Lennarz, A., Matsubara, H., Miki, K., Orrigo, S. E. A., Suzuki, T., Tamii, A., Thies, J. H., and KVI - Center for Advanced Radiation Technology

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