Low-energy enhancement in the γ -ray strength functions of Ge 73,74

T. Renstrøm; H. T. Nyhus; H. Utsunomiya; R. Schwengner; S. Goriely; A. C. Larsen; D. M. Filipescu; I. Gheorghe; L. A. Bernstein; D. L. Bleuel; T. Glodariu; A. Görgen; M. Guttormsen; T. W. Hagen; B. V. Kheswa; Y. W. Lui; D. Negi; I. E. Ruud; T. Shima; S. Siem; K. Takahisa; O. Tesileanu; T. G. Tornyi; G. M. Tveten; M. Wiedeking

doi:10.1103/PhysRevC.93.064302

Low-energy enhancement in the γ -ray strength functions of Ge 73,74

T. Renstrøm, H. T. Nyhus, H. Utsunomiya, R. Schwengner, S. Goriely, A. C. Larsen, D. M. Filipescu, I. Gheorghe, L. A. Bernstein, D. L. Bleuel, T. Glodariu, A. Görgen, M. Guttormsen, T. W. Hagen, B. V. Kheswa, Y. W. Lui, D. Negi, I. E. Ruud, T. Shima, S. SiemK. Takahisa, O. Tesileanu, T. G. Tornyi, G. M. Tveten, M. Wiedeking

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Abstract

The γ-ray strength functions and level densities of Ge73,74 have been extracted up to the neutron-separation energy Sn from particle-γ coincidence data using the Oslo method. Moreover, the γ-ray strength function of Ge74 above Sn has been determined from photoneutron measurements; hence these two experiments cover the range of Eγ≈1-13 MeV for Ge74. The obtained data show that both Ge73,74 display an increase in strength at low γ energies. The experimental γ-ray strength functions are compared with M1 strength functions deduced from average B(M1) values calculated within the shell model for a large number of transitions. The observed low-energy enhancements in Ge73,74 are adopted in the calculations of the Ge72,73(n,γ) cross sections, where there are no direct experimental data. Calculated reaction rates for more neutron-rich germanium isotopes are shown to be strongly dependent on the presence of the low-energy enhancement.

Original language	English
Article number	064302
Journal	Physical Review C
Volume	93
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.93.064302
Publication status	Published - 2 Jun 2016
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.93.064302

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Renstrøm, T., Nyhus, H. T., Utsunomiya, H., Schwengner, R., Goriely, S., Larsen, A. C., Filipescu, D. M., Gheorghe, I., Bernstein, L. A., Bleuel, D. L., Glodariu, T., Görgen, A., Guttormsen, M., Hagen, T. W., Kheswa, B. V., Lui, Y. W., Negi, D., Ruud, I. E., Shima, T., ... Wiedeking, M. (2016). Low-energy enhancement in the γ -ray strength functions of Ge 73,74. Physical Review C, 93(6), Article 064302. https://doi.org/10.1103/PhysRevC.93.064302

@article{fc13665b3181495fb610d106e94f9d7e,

title = "Low-energy enhancement in the γ -ray strength functions of Ge 73,74",

abstract = "The γ-ray strength functions and level densities of Ge73,74 have been extracted up to the neutron-separation energy Sn from particle-γ coincidence data using the Oslo method. Moreover, the γ-ray strength function of Ge74 above Sn has been determined from photoneutron measurements; hence these two experiments cover the range of Eγ≈1-13 MeV for Ge74. The obtained data show that both Ge73,74 display an increase in strength at low γ energies. The experimental γ-ray strength functions are compared with M1 strength functions deduced from average B(M1) values calculated within the shell model for a large number of transitions. The observed low-energy enhancements in Ge73,74 are adopted in the calculations of the Ge72,73(n,γ) cross sections, where there are no direct experimental data. Calculated reaction rates for more neutron-rich germanium isotopes are shown to be strongly dependent on the presence of the low-energy enhancement.",

author = "T. Renstr{\o}m and Nyhus, {H. T.} and H. Utsunomiya and R. Schwengner and S. Goriely and Larsen, {A. C.} and Filipescu, {D. M.} and I. Gheorghe and Bernstein, {L. A.} and Bleuel, {D. L.} and T. Glodariu and A. G{\"o}rgen and M. Guttormsen and Hagen, {T. W.} and Kheswa, {B. V.} and Lui, {Y. W.} and D. Negi and Ruud, {I. E.} and T. Shima and S. Siem and K. Takahisa and O. Tesileanu and Tornyi, {T. G.} and Tveten, {G. M.} and M. Wiedeking",

note = "Publisher Copyright: {\textcopyright} 2016 American Physical Society.",

year = "2016",

month = jun,

day = "2",

doi = "10.1103/PhysRevC.93.064302",

language = "English",

volume = "93",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

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Renstrøm, T, Nyhus, HT, Utsunomiya, H, Schwengner, R, Goriely, S, Larsen, AC, Filipescu, DM, Gheorghe, I, Bernstein, LA, Bleuel, DL, Glodariu, T, Görgen, A, Guttormsen, M, Hagen, TW, Kheswa, BV, Lui, YW, Negi, D, Ruud, IE, Shima, T, Siem, S, Takahisa, K, Tesileanu, O, Tornyi, TG, Tveten, GM & Wiedeking, M 2016, 'Low-energy enhancement in the γ -ray strength functions of Ge 73,74', Physical Review C, vol. 93, no. 6, 064302. https://doi.org/10.1103/PhysRevC.93.064302

TY - JOUR

T1 - Low-energy enhancement in the γ -ray strength functions of Ge 73,74

AU - Renstrøm, T.

AU - Nyhus, H. T.

AU - Utsunomiya, H.

AU - Schwengner, R.

AU - Goriely, S.

AU - Larsen, A. C.

AU - Filipescu, D. M.

AU - Gheorghe, I.

AU - Bernstein, L. A.

AU - Bleuel, D. L.

AU - Glodariu, T.

AU - Görgen, A.

AU - Guttormsen, M.

AU - Hagen, T. W.

AU - Kheswa, B. V.

AU - Lui, Y. W.

AU - Negi, D.

AU - Ruud, I. E.

AU - Shima, T.

AU - Siem, S.

AU - Takahisa, K.

AU - Tesileanu, O.

AU - Tornyi, T. G.

AU - Tveten, G. M.

AU - Wiedeking, M.

PY - 2016/6/2

Y1 - 2016/6/2

N2 - The γ-ray strength functions and level densities of Ge73,74 have been extracted up to the neutron-separation energy Sn from particle-γ coincidence data using the Oslo method. Moreover, the γ-ray strength function of Ge74 above Sn has been determined from photoneutron measurements; hence these two experiments cover the range of Eγ≈1-13 MeV for Ge74. The obtained data show that both Ge73,74 display an increase in strength at low γ energies. The experimental γ-ray strength functions are compared with M1 strength functions deduced from average B(M1) values calculated within the shell model for a large number of transitions. The observed low-energy enhancements in Ge73,74 are adopted in the calculations of the Ge72,73(n,γ) cross sections, where there are no direct experimental data. Calculated reaction rates for more neutron-rich germanium isotopes are shown to be strongly dependent on the presence of the low-energy enhancement.

AB - The γ-ray strength functions and level densities of Ge73,74 have been extracted up to the neutron-separation energy Sn from particle-γ coincidence data using the Oslo method. Moreover, the γ-ray strength function of Ge74 above Sn has been determined from photoneutron measurements; hence these two experiments cover the range of Eγ≈1-13 MeV for Ge74. The obtained data show that both Ge73,74 display an increase in strength at low γ energies. The experimental γ-ray strength functions are compared with M1 strength functions deduced from average B(M1) values calculated within the shell model for a large number of transitions. The observed low-energy enhancements in Ge73,74 are adopted in the calculations of the Ge72,73(n,γ) cross sections, where there are no direct experimental data. Calculated reaction rates for more neutron-rich germanium isotopes are shown to be strongly dependent on the presence of the low-energy enhancement.

UR - http://www.scopus.com/inward/record.url?scp=85007372641&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.93.064302

DO - 10.1103/PhysRevC.93.064302

M3 - Article

AN - SCOPUS:85007372641

SN - 2469-9985

VL - 93

JO - Physical Review C

JF - Physical Review C

IS - 6

M1 - 064302

ER -

Low-energy enhancement in the γ -ray strength functions of Ge 73,74

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