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"

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

Research output: Article

22 Citations (Scopus)

Abstract

To study the Gamow-Teller (GT) transitions from the Tz=+1 nucleus Ca42 to the Tz=0 nucleus Sc42, where Tz is the z component of isospin T, we performed a (p,n)-type (He3,t) charge-exchange reaction at 140 MeV/nucleon and scattering angles around 0. 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 and B(GT) values. The main part of the observed GT transition strength is concentrated in the lowest 0.611-MeV, Jπ=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 Jπ=1+ GT states have T=0 in the Tz=0 nucleus Sc42. 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 Ca42. Comparing the Ca42(He3,t)Sc42 and Ca42(p,p′) spectra measured at 0, candidates for T=1 GT states could be found in the 10-12-MeV region of Sc42. They were all weakly excited. The mass dependence of the GT strength distributions in Sc isotopes is also discussed.

Original languageEnglish
Article number064316
JournalPhysical Review C - Nuclear Physics
Volume91
Issue number6
DOIs
Publication statusPublished - jún. 26 2015

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high resolution
excitation
nuclei
energy
isobars
charge exchange
isotopes
cross sections
approximation
scattering
interactions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

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". / Fujita, Y.; Fujita, H.; Adachi, T.; Susoy, G.; Algora, A.; Bai, C. L.; Colò, G.; Csatlós, M.; Deaven, J. M.; Estevez-Aguado, E.; Guess, C. J.; Gulyás, 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.

In: Physical Review C - Nuclear Physics, Vol. 91, No. 6, 064316, 26.06.2015.

Research output: Article

Fujita, Y, Fujita, H, Adachi, T, Susoy, G, Algora, A, Bai, CL, Colò, G, Csatlós, M, Deaven, JM, Estevez-Aguado, E, Guess, CJ, Gulyás, J, Hatanaka, K, Hirota, K, Honma, M, Ishikawa, D, Krasznahorkay, A, Matsubara, H, Meharchand, R, Molina, F, Nakada, H, Okamura, H, Ong, HJ, Otsuka, T, Perdikakis, G, Rubio, B, Sagawa, H, Sarriguren, P, Scholl, C, Shimbara, Y, Stephenson, EJ, Suzuki, T, Tamii, A, Thies, JH, Yoshida, K, Zegers, RGT & Zenihiro, J 2015, '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"', Physical Review C - Nuclear Physics, vol. 91, no. 6, 064316. https://doi.org/10.1103/PhysRevC.91.064316
Fujita, Y. ; Fujita, H. ; Adachi, T. ; Susoy, G. ; Algora, A. ; Bai, C. L. ; Colò, G. ; Csatlós, M. ; Deaven, J. M. ; Estevez-Aguado, E. ; Guess, C. J. ; Gulyás, 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. / 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". In: Physical Review C - Nuclear Physics. 2015 ; Vol. 91, No. 6.
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title = "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{"}",
abstract = "To study the Gamow-Teller (GT) transitions from the Tz=+1 nucleus Ca42 to the Tz=0 nucleus Sc42, where Tz is the z component of isospin T, we performed a (p,n)-type (He3,t) charge-exchange reaction at 140 MeV/nucleon and scattering angles around 0. 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 and B(GT) values. The main part of the observed GT transition strength is concentrated in the lowest 0.611-MeV, Jπ=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 Jπ=1+ GT states have T=0 in the Tz=0 nucleus Sc42. 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 Ca42. Comparing the Ca42(He3,t)Sc42 and Ca42(p,p′) spectra measured at 0, candidates for T=1 GT states could be found in the 10-12-MeV region of Sc42. They were all weakly excited. The mass dependence of the GT strength distributions in Sc isotopes is also discussed.",
author = "Y. Fujita and H. Fujita and T. Adachi and G. Susoy and A. Algora and Bai, {C. L.} and G. Col{\`o} and M. Csatl{\'o}s and Deaven, {J. M.} and E. Estevez-Aguado and Guess, {C. J.} and J. Guly{\'a}s and K. Hatanaka and K. Hirota and M. Honma and D. Ishikawa and A. Krasznahorkay and H. Matsubara and R. Meharchand and F. Molina and H. Nakada and H. Okamura and Ong, {H. J.} and T. Otsuka and G. Perdikakis and B. Rubio and H. Sagawa and P. Sarriguren and C. Scholl and Y. Shimbara and Stephenson, {E. J.} and T. Suzuki and A. Tamii and Thies, {J. H.} and K. Yoshida and Zegers, {R. G T} and J. Zenihiro",
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T1 - 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"

AU - Fujita, Y.

AU - Fujita, H.

AU - Adachi, T.

AU - Susoy, G.

AU - Algora, A.

AU - Bai, C. L.

AU - Colò, G.

AU - Csatlós, M.

AU - Deaven, J. M.

AU - Estevez-Aguado, E.

AU - Guess, C. J.

AU - Gulyás, J.

AU - Hatanaka, K.

AU - Hirota, K.

AU - Honma, M.

AU - Ishikawa, D.

AU - Krasznahorkay, A.

AU - Matsubara, H.

AU - Meharchand, R.

AU - Molina, F.

AU - Nakada, H.

AU - Okamura, H.

AU - Ong, H. J.

AU - Otsuka, T.

AU - Perdikakis, G.

AU - Rubio, B.

AU - Sagawa, H.

AU - Sarriguren, P.

AU - Scholl, C.

AU - Shimbara, Y.

AU - Stephenson, E. J.

AU - Suzuki, T.

AU - Tamii, A.

AU - Thies, J. H.

AU - Yoshida, K.

AU - Zegers, R. G T

AU - Zenihiro, J.

PY - 2015/6/26

Y1 - 2015/6/26

N2 - To study the Gamow-Teller (GT) transitions from the Tz=+1 nucleus Ca42 to the Tz=0 nucleus Sc42, where Tz is the z component of isospin T, we performed a (p,n)-type (He3,t) charge-exchange reaction at 140 MeV/nucleon and scattering angles around 0. 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 and B(GT) values. The main part of the observed GT transition strength is concentrated in the lowest 0.611-MeV, Jπ=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 Jπ=1+ GT states have T=0 in the Tz=0 nucleus Sc42. 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 Ca42. Comparing the Ca42(He3,t)Sc42 and Ca42(p,p′) spectra measured at 0, candidates for T=1 GT states could be found in the 10-12-MeV region of Sc42. They were all weakly excited. The mass dependence of the GT strength distributions in Sc isotopes is also discussed.

AB - To study the Gamow-Teller (GT) transitions from the Tz=+1 nucleus Ca42 to the Tz=0 nucleus Sc42, where Tz is the z component of isospin T, we performed a (p,n)-type (He3,t) charge-exchange reaction at 140 MeV/nucleon and scattering angles around 0. 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 and B(GT) values. The main part of the observed GT transition strength is concentrated in the lowest 0.611-MeV, Jπ=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 Jπ=1+ GT states have T=0 in the Tz=0 nucleus Sc42. 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 Ca42. Comparing the Ca42(He3,t)Sc42 and Ca42(p,p′) spectra measured at 0, candidates for T=1 GT states could be found in the 10-12-MeV region of Sc42. They were all weakly excited. The mass dependence of the GT strength distributions in Sc isotopes is also discussed.

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