Enhanced low-energy γ-decay probability - Implications for r-process (n; γ) reaction rates

A. C. Larsen; M. Guttormsen; F. L. Bello Garrotte; L. A. Bernstein; D. L. Bleuel; A. Bracco; B. A. Brown; F. Camera; L. Crespo Campo; S. Frauendorf; B. L. Goldblum; S. Goriely; A. Görgen; K. Hadynska-Klek; T. W. Hagen; S. Harissopulos; B. V. Kheswa; M. Klintefjord; S. Leoni; S. N. Liddick; F. Naqvi; G. Perdikakis; T. Renstrøm; A. M. Rogers; S. J. Rose; E. Sahin; R. Schwengner; S. Siem; A. Simon; A. Spyrou; G. M. Tveten; A. Voinov; M. Wiedeking; H. Utsunomiya

Enhanced low-energy γ-decay probability - Implications for r-process (n; γ) reaction rates

A. C. Larsen
, M. Guttormsen
, F. L. Bello Garrotte
, L. A. Bernstein
, D. L. Bleuel
, A. Bracco
, B. A. Brown
, F. Camera
, L. Crespo Campo
, S. Frauendorf
, B. L. Goldblum
, S. Goriely
, A. Görgen
, K. Hadynska-Klek
, T. W. Hagen
, S. Harissopulos
, B. V. Kheswa
, M. Klintefjord
, S. Leoni
, S. N. Liddick

F. Naqvi, G. Perdikakis, T. Renstrøm, A. M. Rogers, S. J. Rose, E. Sahin, R. Schwengner, S. Siem, A. Simon, A. Spyrou, G. M. Tveten, A. Voinov, M. Wiedeking, H. Utsunomiya

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

An unexpected enhancement in the average, reduced γ-decay strength at very low γ-transition energies has been observed in f p-shell nuclei as well as in the Mo region. Very recently, it has been discovered in ¹³⁸La, which is, so far, the heaviest nucleus to display this feature. In this work, we present an experimental and theoretical overview of the low-energy enhancement. In particular, experimental evidence for the dipole nature of the enhancement, and shell-model calculations indicating strong, low-energy M1 transitions are shown. Possible implications of this low-energy enhancement on astrophysical (n; γ) reaction rates of relevance for r-process nucleosynthesis are discussed.

Original language	English
Title of host publication	Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015
Editors	Alfredo Ferrari, Toshihiko Kawano, Mark Chadwick, Francesco Cerutti, P. Schoofs
Publisher	CERN
Pages	271-276
Number of pages	6
ISBN (Electronic)	9789290834182
Publication status	Published - 2015
Externally published	Yes
Event	14th International Conference on Nuclear Reaction Mechanisms, NRM 2015 - Varenna, Italy Duration: 15 Jun 2015 → 19 Jun 2015

Publication series

Name	Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015

Conference

Conference	14th International Conference on Nuclear Reaction Mechanisms, NRM 2015
Country/Territory	Italy
City	Varenna
Period	15/06/15 → 19/06/15

ASJC Scopus subject areas

Energy Engineering and Power Technology
Nuclear Energy and Engineering
Nuclear and High Energy Physics

Cite this

Larsen, A. C., Guttormsen, M., Bello Garrotte, F. L., Bernstein, L. A., Bleuel, D. L., Bracco, A., Brown, B. A., Camera, F., Crespo Campo, L., Frauendorf, S., Goldblum, B. L., Goriely, S., Görgen, A., Hadynska-Klek, K., Hagen, T. W., Harissopulos, S., Kheswa, B. V., Klintefjord, M., Leoni, S., ... Utsunomiya, H. (2015). Enhanced low-energy γ-decay probability - Implications for r-process (n; γ) reaction rates. In A. Ferrari, T. Kawano, M. Chadwick, F. Cerutti, & P. Schoofs (Eds.), Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015 (pp. 271-276). (Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015). CERN.

Larsen, A. C. ; Guttormsen, M. ; Bello Garrotte, F. L. et al. / Enhanced low-energy γ-decay probability - Implications for r-process (n; γ) reaction rates. Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015. editor / Alfredo Ferrari ; Toshihiko Kawano ; Mark Chadwick ; Francesco Cerutti ; P. Schoofs. CERN, 2015. pp. 271-276 (Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015).

@inproceedings{b7dd34296f4d4ff197f1c8f56b1c3620,

title = "Enhanced low-energy γ-decay probability - Implications for r-process (n; γ) reaction rates",

abstract = "An unexpected enhancement in the average, reduced γ-decay strength at very low γ-transition energies has been observed in f p-shell nuclei as well as in the Mo region. Very recently, it has been discovered in 138La, which is, so far, the heaviest nucleus to display this feature. In this work, we present an experimental and theoretical overview of the low-energy enhancement. In particular, experimental evidence for the dipole nature of the enhancement, and shell-model calculations indicating strong, low-energy M1 transitions are shown. Possible implications of this low-energy enhancement on astrophysical (n; γ) reaction rates of relevance for r-process nucleosynthesis are discussed.",

author = "Larsen, \{A. C.\} and M. Guttormsen and \{Bello Garrotte\}, \{F. L.\} and Bernstein, \{L. A.\} and Bleuel, \{D. L.\} and A. Bracco and Brown, \{B. A.\} and F. Camera and \{Crespo Campo\}, L. and S. Frauendorf and Goldblum, \{B. L.\} and S. Goriely and A. G{\"o}rgen and K. Hadynska-Klek and Hagen, \{T. W.\} and S. Harissopulos and Kheswa, \{B. V.\} and M. Klintefjord and S. Leoni and Liddick, \{S. N.\} and F. Naqvi and G. Perdikakis and T. Renstr{\o}m and Rogers, \{A. M.\} and Rose, \{S. J.\} and E. Sahin and R. Schwengner and S. Siem and A. Simon and A. Spyrou and Tveten, \{G. M.\} and A. Voinov and M. Wiedeking and H. Utsunomiya",

note = "Publisher Copyright: {\textcopyright} 2015, CERN. All rights reserved.; 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015 ; Conference date: 15-06-2015 Through 19-06-2015",

year = "2015",

language = "English",

series = "Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015",

publisher = "CERN",

pages = "271--276",

editor = "Alfredo Ferrari and Toshihiko Kawano and Mark Chadwick and Francesco Cerutti and P. Schoofs",

booktitle = "Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015",

}

Larsen, AC, Guttormsen, M, Bello Garrotte, FL, Bernstein, LA, Bleuel, DL, Bracco, A, Brown, BA, Camera, F, Crespo Campo, L, Frauendorf, S, Goldblum, BL, Goriely, S, Görgen, A, Hadynska-Klek, K, Hagen, TW, Harissopulos, S, Kheswa, BV, Klintefjord, M, Leoni, S, Liddick, SN, Naqvi, F, Perdikakis, G, Renstrøm, T, Rogers, AM, Rose, SJ, Sahin, E, Schwengner, R, Siem, S, Simon, A, Spyrou, A, Tveten, GM, Voinov, A, Wiedeking, M & Utsunomiya, H 2015, Enhanced low-energy γ-decay probability - Implications for r-process (n; γ) reaction rates. in A Ferrari, T Kawano, M Chadwick, F Cerutti & P Schoofs (eds), Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015. Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015, CERN, pp. 271-276, 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015, Varenna, Italy, 15/06/15.

Enhanced low-energy γ-decay probability - Implications for r-process (n; γ) reaction rates. / Larsen, A. C.; Guttormsen, M.; Bello Garrotte, F. L. et al.
Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015. ed. / Alfredo Ferrari; Toshihiko Kawano; Mark Chadwick; Francesco Cerutti; P. Schoofs. CERN, 2015. p. 271-276 (Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Enhanced low-energy γ-decay probability - Implications for r-process (n; γ) reaction rates

AU - Larsen, A. C.

AU - Guttormsen, M.

AU - Bello Garrotte, F. L.

AU - Bernstein, L. A.

AU - Bleuel, D. L.

AU - Bracco, A.

AU - Brown, B. A.

AU - Camera, F.

AU - Crespo Campo, L.

AU - Frauendorf, S.

AU - Goldblum, B. L.

AU - Goriely, S.

AU - Görgen, A.

AU - Hadynska-Klek, K.

AU - Hagen, T. W.

AU - Harissopulos, S.

AU - Kheswa, B. V.

AU - Klintefjord, M.

AU - Leoni, S.

AU - Liddick, S. N.

AU - Naqvi, F.

AU - Perdikakis, G.

AU - Renstrøm, T.

AU - Rogers, A. M.

AU - Rose, S. J.

AU - Sahin, E.

AU - Schwengner, R.

AU - Siem, S.

AU - Simon, A.

AU - Spyrou, A.

AU - Tveten, G. M.

AU - Voinov, A.

AU - Wiedeking, M.

AU - Utsunomiya, H.

PY - 2015

Y1 - 2015

N2 - An unexpected enhancement in the average, reduced γ-decay strength at very low γ-transition energies has been observed in f p-shell nuclei as well as in the Mo region. Very recently, it has been discovered in 138La, which is, so far, the heaviest nucleus to display this feature. In this work, we present an experimental and theoretical overview of the low-energy enhancement. In particular, experimental evidence for the dipole nature of the enhancement, and shell-model calculations indicating strong, low-energy M1 transitions are shown. Possible implications of this low-energy enhancement on astrophysical (n; γ) reaction rates of relevance for r-process nucleosynthesis are discussed.

AB - An unexpected enhancement in the average, reduced γ-decay strength at very low γ-transition energies has been observed in f p-shell nuclei as well as in the Mo region. Very recently, it has been discovered in 138La, which is, so far, the heaviest nucleus to display this feature. In this work, we present an experimental and theoretical overview of the low-energy enhancement. In particular, experimental evidence for the dipole nature of the enhancement, and shell-model calculations indicating strong, low-energy M1 transitions are shown. Possible implications of this low-energy enhancement on astrophysical (n; γ) reaction rates of relevance for r-process nucleosynthesis are discussed.

UR - https://www.scopus.com/pages/publications/84973620674

M3 - Conference contribution

AN - SCOPUS:84973620674

T3 - Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015

SP - 271

EP - 276

BT - Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015

A2 - Ferrari, Alfredo

A2 - Kawano, Toshihiko

A2 - Chadwick, Mark

A2 - Cerutti, Francesco

A2 - Schoofs, P.

PB - CERN

T2 - 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015

Y2 - 15 June 2015 through 19 June 2015

ER -

Larsen AC, Guttormsen M, Bello Garrotte FL, Bernstein LA, Bleuel DL, Bracco A et al. Enhanced low-energy γ-decay probability - Implications for r-process (n; γ) reaction rates. In Ferrari A, Kawano T, Chadwick M, Cerutti F, Schoofs P, editors, Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015. CERN. 2015. p. 271-276. (Proceedings of the 14th International Conference on Nuclear Reaction Mechanisms, NRM 2015).

Enhanced low-energy γ-decay probability - Implications for r-process (n; γ) reaction rates

Abstract

Publication series

Conference

ASJC Scopus subject areas

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