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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
physics and astronomy
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, Volume 91, No. 6, Article 064316, Year 2015
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Description
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. © 2015 American Physical Society.
Authors & Co-Authors
Fujita, Yoshitaka
Japan, Suita
Osaka University
Fujita, Hirohiko
Japan, Suita
Osaka University
Adachi, Tatsuya
Japan, Suita
Osaka University
Süsoy, Gulfem
Japan, Suita
Osaka University
Turkey, Istanbul
Istanbul Üniversitesi
Algora, A.
Spain, Paterna
Csic-uv - Instituto de Física Corpuscular
Hungary, Debrecen
Atommagkutató Intézet
Colò, Gianluca L.
Italy, Milan
Università Degli Studi Di Milano
Deaven, J. M.
United States, Alexandria
National Science Foundation
United States, East Lansing
Joint Institute for Nuclear Astrophysics - Center for the Evolution of the Elements
United States, East Lansing
Michigan State University
Guess, C. J.
United States, Alexandria
National Science Foundation
United States, East Lansing
Joint Institute for Nuclear Astrophysics - Center for the Evolution of the Elements
United States, East Lansing
Michigan State University
Hatanaka, Kichiji
Japan, Suita
Osaka University
Hirota, Katsuya
Japan, Suita
Osaka University
Honma, Michio
Japan, Aizuwakamatsu
The University of Aizu
Ishikawa, D.
Japan, Suita
Osaka University
Krasznahorkay, Attila János
Hungary, Debrecen
Atommagkutató Intézet
Matsubara, Hiroaki
Japan, Suita
Osaka University
Meharchand, Rhiannon T.
United States, Alexandria
National Science Foundation
United States, East Lansing
Joint Institute for Nuclear Astrophysics - Center for the Evolution of the Elements
United States, East Lansing
Michigan State University
Molina, Francisco G.
Spain, Paterna
Csic-uv - Instituto de Física Corpuscular
Nakada, Hitoshi
Japan, Chiba
Chiba University
Okamura, Hiroyuki
Japan, Suita
Osaka University
Ong, Hooi Jin
Japan, Suita
Osaka University
Otsuka, Takaharu
Japan, Tokyo
The University of Tokyo
Perdikakis, Georgios
United States, Alexandria
National Science Foundation
United States, Mount Pleasant
Central Michigan University
Rubio, Berta
Spain, Paterna
Csic-uv - Instituto de Física Corpuscular
Sarriguren, Pedro
Spain, Madrid
Csic - Instituto de Estructura de la Materia Iem
Shimbara, Yoshihiro
Japan, Sendai
Tohoku University
Stephenson, Edward J.
United States, Bloomington
Indiana University Bloomington
Suzuki, Tomokazu
Japan, Suita
Osaka University
Tamii, Atsushi
Japan, Suita
Osaka University
Thies, J. H.
Germany, Munster
University of Münster
Zegers, Remco G.T.
United States, Alexandria
National Science Foundation
United States, East Lansing
Joint Institute for Nuclear Astrophysics - Center for the Evolution of the Elements
United States, East Lansing
Michigan State University
Zenihiro, J.
Japan, Suita
Osaka University
Statistics
Citations: 36
Authors: 30
Affiliations: 20
Identifiers
Doi:
10.1103/PhysRevC.91.064316
ISSN:
05562813