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Jänecke, J.; Pham, Kevin; Roberts, D. A.; Stewart, David W.; Harakeh, M.N.; Berg, G.P.A.; Foster, C.C.; Lisantti, J.; Sawafta, R.; Stephenson, E.J.; VANDENBERG, A; Vanderwerf, Sy; Muraviev, S.; Urin, M. H.

doi:10.1103/physrevc.48.2828

Cited by 42 publications

(99 citation statements)

References 34 publications

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“…On the other hand, the existence of the isovector electric monopole resonance (IVMR; DT 1, DS DL 0) has been reported only by the pion charge-exchange reaction [4]. The IVMR has also been searched for by using other reaction probes such as electron scattering [5] and the ͑ 13 C, 13 N͒ reaction [6]. Confirmation of the IVMR is, however, still very desirable because of the inconclusive data from these reactions.…”

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confidence: 95%

Isovector Electric Monopole Resonance in60Ni

et al. 1999

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The isovector electric monopole resonance (IVMR) was studied by the 60 Ni͑ 7 Li, 7 Be͒ 60 Co reaction at 65A MeV and at forward scattering angles including zero degrees. We confirmed the existence of the IVMR at an excitation energy of 20 6 2 MeV with a width of 10 6 2 MeV in 60 Co, which is an analog of the T 0 1 1 isospin component of the IVMR estimated at E x ഠ 31 MeV in 60 Ni. The result presently obtained is consistent with previous results using the pion charge-exchange reaction. PACS numbers: 25.70.Kk, 24.30.Cz, 27.50. + e Isovector resonances ͑DT 1͒ in nuclei are collective motions in which protons oscillate in opposite phase with respect to neutrons. These resonances are also characterized by the electric ͑DS 0͒ and magnetic ͑DS 1͒ modes which correspond to coherent motions of the spin-nonflip and spin-flip oscillations, respectively. Resonances with various multipolarities have been theoretically predicted [1]. Among them, the monopole resonances play a crucial role in astrophysics [2]. Concerning the isoscalar mode ͑DT 0͒, the electric monopole resonance (GMR; DT 0, DS DL 0) has been well established in various inelastic scatterings. The GMR was unambiguously identified due to a sharp enhancement at u L 0 ± [3]. On the other hand, the existence of the isovector electric monopole resonance (IVMR; DT 1, DS DL 0) has been reported only by the pion charge-exchange reaction [4]. The IVMR has also been searched for by using other reaction probes such as electron scattering [5] and the ͑ 13 C, 13 N͒ reaction [6]. Confirmation of the IVMR is, however, still very desirable because of the inconclusive data from these reactions.One of the major reasons for the inconclusive data is due to a difficulty in determining the multipolarity of the resonance. The resonance is, in general, observed as a broad bump riding on a large underlying background mainly caused by a quasielastic scattering. One meets another serious difficulty when one uses hadron reaction probes with spins like ͑p, n͒ and ͑ 3 He, t͒. These reactions allow simultaneous DS 0 and DS 1 excitations, differing from the case of the pion charge-exchange reaction which proceeds only via the DS 0 transition. There is no nuclear probe allowing only the DS 0 excitation. In this respect, the ͑ 13 C, 13 N͒ reaction is expected to be a promising probe for observing isovector electric resonances because of its large Fermi matrix element ͑M F ͞M GT ϳ 5͒ [6]. In this reaction, a resonance has been observed at the relevant excitation energy, but its multipolarity is not consistent with the DL 0 assumption.In the present work, we started with the following question: Can we observe the IVMR reported by the pion charge-exchange reaction? To answer this question, we employed the ͑ 7 Li, 7 Be͒ reaction at 65A MeV on a 60 Ni target which is the target studied by various other ͑n, p͒-like reactions [4,6,7]. The ͑ 7 Li, 7 Be͒ reaction is chosen for the following two reasons. One is that the reaction predominantly proceeds via a one-step process at 65A MeV and at forward an...

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confidence: 95%

Isovector Electric Monopole Resonance in60Ni

et al. 1999

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“…Accordingly, in the ( 3 He, t) reaction on 41 K, GT transitions mainly proceed from the neutron (ν)f 7/2 orbital to the proton (π)f 7/2 and πf 5/2 orbitals. This results in states in 41 Ca of particle-particle (p-p) character, namely πf 7/2 -νf 7/2 and πf 5/2 -νf 7/2 configurations on top of the 40 Ca core with one πd 3/2 hole. Because of the attractive nature of the p-p interaction [54], we expect that these states to lie at a relatively low excitation energy.…”

Section: B Total B(gt) Strengthmentioning

confidence: 99%

“…One can see that this value is only 40% of the sum-rule-limit value of 3(N − Z) even if the negative contribution from the GT strengths in the β + direction is ignored. A continuum from quasifree scattering (QFS) [40,41] is expected above the proton separation energy of S p = 5.17 MeV. Since there is no theory for reliably calculating the cross section of the QFS continuum, a background described by a smooth line was subtracted in our analysis, as mentioned above.…”

Section: B Total B(gt) Strengthmentioning

confidence: 99%

High-resolution study of Gamow-Teller transitions in the47Ti(3He,t)
Ganioğlu¹,
Fujita²,
Fujita³
et al. 2013
Phys. Rev. C

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Given the importance of Gamow-Teller (GT) transitions in nuclear structure and astrophysical nuclear processes, we have studied Tz = +3/2 → +1/2, GT transitions starting from the 47 Ti nucleus in the ( 3 He, t) charge-exchange reaction at 0• and at an intermediate incident energy of 140 MeV/nucleon. The experiments were carried out at the Research Center for Nuclear Physics (RCNP), Osaka using the high resolution facility consisting of a high-dispersion beam line and the Grand-Raiden spectrometer. With an energy resolution of 20 keV, individual GT transitions were observed and GT strength was derived for each state populated up to an excitation energy (Ex) of 12.5 MeV. The GT strength was widely distributed from low excitation energy up to 12.5 MeV, where we had to stop the analysis due to the high level density. The distribution of the GT strengths was compared with the results of shell model calculations using the GXPF1 interaction. The calculations could reproduce the experimental GT distributions well. The GT transitions from the ground state of 47 Ti and the M 1 transitions from the isobaric analog state in 47 V to the same low-lying states in 47 V are analogous. It was found that the ratios of GT transition strengths to the ground state, the 0.088 MeV, and the 0.146 MeV states are similar to the ratios of the strengths of the analogous M 1 transitions from the IAS to these states. The measured distribution of the GT strengths was also compared with those starting from the Tz = +3/2 nucleus 41 K to the Tz = +1/2 nucleus 41 Ca.

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“…Long tails extend to lower and higher excitation energies. The GT strength at excitation energies below the main peak have been studied in detail for tin isotopes [79,80]. Whereas the main peak of the GTR was attributed mostly to "direct spin-flip" excitations, associated with neutrons from orbits with j = l + 1 2 being exchanged for protons in the spin-orbit partner orbits with j = l − 1 2 , the strength at lower excitation energies was attributed to "core polarization spinflip" (j = l ± 1 2 → j = l ± 1 2 ) and "back spin-flip"…”

Section: Extraction Of Gamow-teller Strengths and Dipole Cross Smentioning

confidence: 99%

TheNd150(He3,
Guess¹,
Adachi²,
Akimune³
et al. 2011
Phys. Rev. C
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The ^{150}Nd(^{3}He,t) and ^{150}Sm(t,^{3}He) reactions with applications to ββ decay of ^{150}Nd 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 ββ decay (0νββ) of 150 Nd. The present results thus provide useful information on the neutrino responses for evaluating the 0νββ and 2νββ matrix elements. The 2νββ 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 2νββ direct counting experiments and at least several transitions through 1 + intermediate states in 150 Pm are required to explain the 2νββ 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 ω, ∆L = 0, ∆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.

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Fragmentation of Gamow-Teller strength observed inSn117,120
J. Jänecke
¹
,
Kevin Pham
²
,
D. A. Roberts
³

et al.

Cited by 42 publications

References 34 publications

Isovector Electric Monopole Resonance in60Ni

Isovector Electric Monopole Resonance in60Ni

High-resolution study of Gamow-Teller transitions in the47Ti(3He,t)
Ganioğlu¹,
Fujita²,
Fujita³
et al. 2013
Phys. Rev. C

TheNd150(He3,
Guess¹,
Adachi²,
Akimune³
et al. 2011
Phys. Rev. C
Self Cite

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Fragmentation of Gamow-Teller strength observed inSn117,120J. Jänecke1, Kevin Pham2, D. A. Roberts3 et al.

Cited by 42 publications

References 34 publications

Isovector Electric Monopole Resonance in60Ni

Isovector Electric Monopole Resonance in60Ni

High-resolution study of Gamow-Teller transitions in the47Ti(3He,t)Ganioğlu1, Fujita2, Fujita3 et al. 2013Phys. Rev. C

TheNd150(He3,Guess1, Adachi2, Akimune3 et al. 2011Phys. Rev. CSelf Cite

Contact Info

Product

Resources

About

Fragmentation of Gamow-Teller strength observed inSn117,120
J. Jänecke
¹
,
Kevin Pham
²
,
D. A. Roberts
³

et al.

High-resolution study of Gamow-Teller transitions in the47Ti(3He,t)
Ganioğlu¹,
Fujita²,
Fujita³
et al. 2013
Phys. Rev. C

TheNd150(He3,
Guess¹,
Adachi²,
Akimune³
et al. 2011
Phys. Rev. C
Self Cite