Lifetime measurements of excited states in 17C: Possible interplay between collectivity and halo effects

D. Suzuki; H. Iwasaki; H. J. Ong; N. Imai; H. Sakurai; T. Nakao; N. Aoi; H. Baba; S. Bishop; Y. Ichikawa; M. Ishihara; Y. Kondo; T. Kubo; K. Kurita; T. Motobayashi; T. Nakamura; T. Okumura; T. K. Onishi; S. Ota; M. K. Suzuki; S. Takeuchi; Y. Togano; Y. Yanagisawa

doi:10.1016/j.physletb.2008.07.055

Lifetime measurements of excited states in ¹⁷C: Possible interplay between collectivity and halo effects

D. Suzuki, H. Iwasaki, H. J. Ong, N. Imai, H. Sakurai, T. Nakao, N. Aoi, H. Baba, S. Bishop, Y. Ichikawa, M. Ishihara, Y. Kondo, T. Kubo, K. Kurita, T. Motobayashi, T. Nakamura, T. Okumura, T. K. Onishi, S. Ota, M. K. SuzukiS. Takeuchi, Y. Togano, Y. Yanagisawa

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Abstract

Lifetime measurements were performed on low-lying excited states of the neutron-rich isotope ¹⁷C using the recoil shadow method. The γ-decay mean lifetimes were determined to be 583 ± 21 (stat) ± 35 (syst) ps for the first excited state at 212 keV and 18.9 ± 0.6 (stat) ± 4.7 (syst) ps for the second excited state at 333 keV. Based on a comparison with the empirical upper limits for the electromagnetic transition strengths, these decays are concluded to be predominantly M1 transitions. The reduced M1 transition probabilities to the ground state were deduced to be (1.0 ± 0.1) × 10^-2 μ_N² and (8.2_-1.8^+3.2) × 10^-2 μ_N², respectively, for the first and second excited states. The strongly hindered M1 strength as well as the lowered excitation energy represents unique nature of the 212-keV state.

Original language	English
Pages (from-to)	222-227
Number of pages	6
Journal	Physics Letters B
Volume	666
Issue number	3
DOIs	https://doi.org/10.1016/j.physletb.2008.07.055
State	Published - 21 Aug 2008
Externally published	Yes

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Suzuki, D., Iwasaki, H., Ong, H. J., Imai, N., Sakurai, H., Nakao, T., Aoi, N., Baba, H., Bishop, S., Ichikawa, Y., Ishihara, M., Kondo, Y., Kubo, T., Kurita, K., Motobayashi, T., Nakamura, T., Okumura, T., Onishi, T. K., Ota, S., ... Yanagisawa, Y. (2008). Lifetime measurements of excited states in ¹⁷C: Possible interplay between collectivity and halo effects. Physics Letters B, 666(3), 222-227. https://doi.org/10.1016/j.physletb.2008.07.055

@article{55d5bf8a98c7451ea897bc78079e437e,

title = "Lifetime measurements of excited states in 17C: Possible interplay between collectivity and halo effects",

abstract = "Lifetime measurements were performed on low-lying excited states of the neutron-rich isotope 17C using the recoil shadow method. The γ-decay mean lifetimes were determined to be 583 ± 21 (stat) ± 35 (syst) ps for the first excited state at 212 keV and 18.9 ± 0.6 (stat) ± 4.7 (syst) ps for the second excited state at 333 keV. Based on a comparison with the empirical upper limits for the electromagnetic transition strengths, these decays are concluded to be predominantly M1 transitions. The reduced M1 transition probabilities to the ground state were deduced to be (1.0 ± 0.1) × 10-2 μN2 and (8.2-1.8+3.2) × 10-2 μN2, respectively, for the first and second excited states. The strongly hindered M1 strength as well as the lowered excitation energy represents unique nature of the 212-keV state.",

author = "D. Suzuki and H. Iwasaki and Ong, {H. J.} and N. Imai and H. Sakurai and T. Nakao and N. Aoi and H. Baba and S. Bishop and Y. Ichikawa and M. Ishihara and Y. Kondo and T. Kubo and K. Kurita and T. Motobayashi and T. Nakamura and T. Okumura and Onishi, {T. K.} and S. Ota and Suzuki, {M. K.} and S. Takeuchi and Y. Togano and Y. Yanagisawa",

note = "Funding Information: We thank the RIKEN Ring Cyclotron staff members for providing a stable Ne 22 beam throughout the experiment. Fruitful discussions with Dr. M. Yamagami, Prof. T. Suzuki and Prof. I. Hamamoto are greatly appreciated. D.S. is grateful to the Japan Society for the Promotion of Science (JSPS) for scholarships. This work was supported in part by a Grant-in-Aid for Scientific Research No. 15204017 from JSPS. ",

year = "2008",

month = aug,

day = "21",

doi = "10.1016/j.physletb.2008.07.055",

language = "English",

volume = "666",

pages = "222--227",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "3",

}

Suzuki, D, Iwasaki, H, Ong, HJ, Imai, N, Sakurai, H, Nakao, T, Aoi, N, Baba, H, Bishop, S, Ichikawa, Y, Ishihara, M, Kondo, Y, Kubo, T, Kurita, K, Motobayashi, T, Nakamura, T, Okumura, T, Onishi, TK, Ota, S, Suzuki, MK, Takeuchi, S, Togano, Y & Yanagisawa, Y 2008, 'Lifetime measurements of excited states in ¹⁷C: Possible interplay between collectivity and halo effects', Physics Letters B, vol. 666, no. 3, pp. 222-227. https://doi.org/10.1016/j.physletb.2008.07.055

TY - JOUR

T1 - Lifetime measurements of excited states in 17C

T2 - Possible interplay between collectivity and halo effects

AU - Suzuki, D.

AU - Iwasaki, H.

AU - Ong, H. J.

AU - Imai, N.

AU - Sakurai, H.

AU - Nakao, T.

AU - Aoi, N.

AU - Baba, H.

AU - Bishop, S.

AU - Ichikawa, Y.

AU - Ishihara, M.

AU - Kondo, Y.

AU - Kubo, T.

AU - Kurita, K.

AU - Motobayashi, T.

AU - Nakamura, T.

AU - Okumura, T.

AU - Onishi, T. K.

AU - Ota, S.

AU - Suzuki, M. K.

AU - Takeuchi, S.

AU - Togano, Y.

AU - Yanagisawa, Y.

N1 - Funding Information: We thank the RIKEN Ring Cyclotron staff members for providing a stable Ne 22 beam throughout the experiment. Fruitful discussions with Dr. M. Yamagami, Prof. T. Suzuki and Prof. I. Hamamoto are greatly appreciated. D.S. is grateful to the Japan Society for the Promotion of Science (JSPS) for scholarships. This work was supported in part by a Grant-in-Aid for Scientific Research No. 15204017 from JSPS.

PY - 2008/8/21

Y1 - 2008/8/21

N2 - Lifetime measurements were performed on low-lying excited states of the neutron-rich isotope 17C using the recoil shadow method. The γ-decay mean lifetimes were determined to be 583 ± 21 (stat) ± 35 (syst) ps for the first excited state at 212 keV and 18.9 ± 0.6 (stat) ± 4.7 (syst) ps for the second excited state at 333 keV. Based on a comparison with the empirical upper limits for the electromagnetic transition strengths, these decays are concluded to be predominantly M1 transitions. The reduced M1 transition probabilities to the ground state were deduced to be (1.0 ± 0.1) × 10-2 μN2 and (8.2-1.8+3.2) × 10-2 μN2, respectively, for the first and second excited states. The strongly hindered M1 strength as well as the lowered excitation energy represents unique nature of the 212-keV state.

AB - Lifetime measurements were performed on low-lying excited states of the neutron-rich isotope 17C using the recoil shadow method. The γ-decay mean lifetimes were determined to be 583 ± 21 (stat) ± 35 (syst) ps for the first excited state at 212 keV and 18.9 ± 0.6 (stat) ± 4.7 (syst) ps for the second excited state at 333 keV. Based on a comparison with the empirical upper limits for the electromagnetic transition strengths, these decays are concluded to be predominantly M1 transitions. The reduced M1 transition probabilities to the ground state were deduced to be (1.0 ± 0.1) × 10-2 μN2 and (8.2-1.8+3.2) × 10-2 μN2, respectively, for the first and second excited states. The strongly hindered M1 strength as well as the lowered excitation energy represents unique nature of the 212-keV state.

UR - http://www.scopus.com/inward/record.url?scp=48449096894&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2008.07.055

DO - 10.1016/j.physletb.2008.07.055

M3 - Article

AN - SCOPUS:48449096894

SN - 0370-2693

VL - 666

SP - 222

EP - 227

JO - Physics Letters B

JF - Physics Letters B

IS - 3

ER -

Lifetime measurements of excited states in ¹⁷C: Possible interplay between collectivity and halo effects

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