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. (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. Phys. Rev. C, 91 (6). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1089-490X

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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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Fujita, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fujita, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Adachi, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Susoy, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Algora, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bai, C. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Colo, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Csatlos, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deaven, J. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Estevez-Aguado, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guess, C. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gulyas, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hatanaka, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hirota, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Honma, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ishikawa, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Krasznahorkay, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Matsubara, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meharchand, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Molina, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nakada, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Okamura, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ong, H. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Otsuka, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Perdikakis, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rubio, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sagawa, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sarriguren, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scholl, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shimbara, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stephenson, E. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Suzuki, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tamii, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Thies, J. H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yoshida, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zegers, R. G. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zenihiro, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-400828
DOI: 10.1103/PhysRevC.91.064316
Journal or Publication Title: Phys. Rev. C
Volume: 91
Number: 6
Date: 2015
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1089-490X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
P,N REACTION; BETA-DECAY; BEAM LINE; NUCLEI; SCATTERING; SPECTROMETER; RESONANCES; SPIN; TRANSITIONS; STRENGTHMultiple languages
Physics, NuclearMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/40082

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