Investigating the strength of the N = 34 subshell closure in 54Ca

International Symposium on Exotic Nuclear Structure From Nucleons 2012

Steppenbeck, D.^1 ; Takeuchi, S.^2 ; Aoi, N.^3 ; Doornenbal, P.^2 ; Lee, J.^2 ; Matsushita, M.^1 ; Wang, H.^2,4 ; Baba, H.^2 ; Fukuda, N.^2 ; Go, S.^1 ; Honma, M.^5 ; Matsui, K.^6 ; Michimasa, S.^1 ; Motobayashi, T.^2 ; Nishimura, D.^7 ; Otsuka, T.^1,6 ; Sakurai, H.^2,6 ; Shiga, Y.^8 ; Söderström, P.-A.^2 ; Sumikama, T.^9 ; Suzuki, H.^2 ; Taniuchi, R.^6 ; Utsuno, Y.^10 ; Valiente-Dobón, J.J.^11 ; Yoneda, K.^2

Center for Nuclear Study, University of Tokyo, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan^1

RIKEN Nishina Center, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan^2

Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan^3

School of Physics, State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China^4

Center for Mathematical Sciences, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8580, Japan^5

Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan^6

Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan^7

Department of Physics, Rikkyo University, Toshima, Tokyo 172-8501, Japan^8

Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan

(10) Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

(11) Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro I-35020, Italy^9

关键词: Gamma-ray energy;    Gamma-ray spectroscopy;    Model spaces;    New results;    Proton knockout;    Radioactive beams;    Shell models;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/445/1/012012/pdf
DOI  :  10.1088/1742-6596/445/1/012012

来源: IOP

【 摘 要 】

Excited states in the exotic N = 34 isotope54Ca have been measured for the first time via in-beam γ-ray spectroscopy with proton-knockout reactions from55Sc and56Ti radioactive beams on a Be reaction target at the Radioactive Isotope Beam Factory, Japan. A strong candidate for the transition from the first 2+state to the 0+ground state has been identified, in addition to several other weaker transitions. The structure of the N = 33 isotope53Ca has also been investigated from the same data. Preliminary γ-ray energy spectra for54Ca and53Ca will be presented and the significance of the N = 34 subshell closure will be examined. Predictions of several shell-model interactions performed in the fp model space will be discussed in light of the new results.