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1. Fra tradisjon til attraksjon. Turismens påvirkning på autentisitet og tradisjoner på Gozo

Author

Larsen, André Eide

Subjects
verdi, Malta, Gozo, turisme, erfaring, attraksjon, autentisitet, tradisjon
Abstract

Denne oppgaven tar for seg hvordan turisme påvirker tradisjonelle produkter og festivaler på Gozo. Gozo er en øy i øygruppen Malta. Gozo blir markedsført som et sted med tradisjonelle og kulturelle attraksjoner. Oppgaven tar opp hvordan verdien av tradisjoner forandrer seg og blir påvirket av turisme. Med tradisjon mener jeg her praksiser som oppleves som gamle og med en spesielt sterk tilknytning til kulturen den er en del av samt at den har en verdi for fremtiden. Jeg finner at begrepene «autentisitet» og «attraksjoner» er gode for å drøfte hvordan turisme påvirker Gozo. Fokuset på å ha autentiske og ekte attraksjoner gjør at noen praksiser presenteres slik at de virker mer tradisjonelle enn de gjorde i utgangspunktet. Oppfattelsen av verdi og ekthet i en tradisjon kan forandre seg for både lokale og turister uten at den mister sin verdi som tradisjon eller attraksjon. Jeg viser dette ved å se på noen kommersialiserte tradisjoner på Gozo: vinproduksjon, hekling og karneval. Jeg har snakket med informanter, både lokale og turister, om hvordan de opplevede tradisjonelle produkter og festivaler. Praksisene jeg observerte tyder på at forholdet mellom turisme og tradisjoner er mer komplekst enn det virker som ved første øyekast. Gozoitene gav utrykk for at selv om turistene førte til at tradisjonene forandret seg, var de ikke mindre viktige nå enn tidligere av den grunn. Min empiri tyder på at markedsføring, popularitet, turistifisering og kommersialisering ikke nødvendigvis fører til et meningstap i tradisjoner. Jeg mener at turisme kan ha mange ulike påvirkninger på opplevelsen av en tradisjon, både for de lokale og for turistene selv. I oppgaven utforsker jeg hva som ligger i verdiene av tradisjoner og hvordan turismen påvirker dem. Jeg ser på hvordan turistene deltar og bruker tradisjonene, og hvordan Gozoitene forholder seg til turismen og kommersialiseringen. Jeg argumenterer for at turismen fører til en forandring av tradisjoner, men at det ikke nødvendigvis fører til at den mister all sin verdi, verken for turister og lokale. Master i Sosialantropologi SANT350 MASV-SANT

Published
2016

2. Experimentally constrained (p,γ) y 89 and (n,γ) y 89 reaction rates relevant to p -process nucleosynthesis

Author

Larsen, André, Giacoppo, F, Görgen, Andreas, Hagen, T.W., Klintefjord, M., Renstrøm, Therese, Rose, S.J., Sahin, Ercan, Siem, Sunniva, Tornyi, T.G., Tveten, G.M., Guttormsen, Magne, Voinov, A., Wiedeking, M., Schwengner, Ronald, Bleuel, Darren D.L., Goriely, Stéphane, Harissopulos, Sotirios, Bello Garrote, F.L., Byun, Y., Eriksen, T.K., Larsen, André, Giacoppo, F, Görgen, Andreas, Hagen, T.W., Klintefjord, M., Renstrøm, Therese, Rose, S.J., Sahin, Ercan, Siem, Sunniva, Tornyi, T.G., Tveten, G.M., Guttormsen, Magne, Voinov, A., Wiedeking, M., Schwengner, Ronald, Bleuel, Darren D.L., Goriely, Stéphane, Harissopulos, Sotirios, Bello Garrote, F.L., Byun, Y., and Eriksen, T.K.

Abstract

The nuclear level density and the γ-ray strength function have been extracted for Y89 by using the Oslo method on Y89(p,p′γ)Y89 coincidence data. The γ-ray strength function displays a low-energy enhancement consistent with previous observations in this mass region (Mo93-98). Shell-model calculations support the conclusion that the observed enhancement is due to strong, low-energy M1 transitions at high excitation energies. The data were further used as input for calculations of the Sr88(p,γ)Y89 and Y88(n,γ)Y89 cross sections with the talys reaction code. Comparison with cross-section data, where available, as well as with values from the BRUSLIB library, shows a satisfying agreement., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2016

3. Statistical nuclear properties and synthesis of 138La

Author

Kheswa, B.V., Hagen, T.W., Koehler, P., Klintefjord, M., Nyhus, Hilde Therese, Papka, Paul, Renstrøm, Therese, Rose, S.J., Sahin, Esin, Siem, Sunniva, Tornyi, T.G., Wiedeking, M., Giacoppo, F, Goriely, Stéphane, Guttormsen, Magne, Larsen, André, Bello Garrote, F.L., Eriksen, T.K., Görgen, Andreas, Kheswa, B.V., Hagen, T.W., Koehler, P., Klintefjord, M., Nyhus, Hilde Therese, Papka, Paul, Renstrøm, Therese, Rose, S.J., Sahin, Esin, Siem, Sunniva, Tornyi, T.G., Wiedeking, M., Giacoppo, F, Goriely, Stéphane, Guttormsen, Magne, Larsen, André, Bello Garrote, F.L., Eriksen, T.K., and Görgen, Andreas

Abstract

The synthesis of the neutron deficient 138La nucleus has been a puzzle for a long time. It has not been clear whether it is produced through photodisintegration processes or neutrino induced reactions due to unavailability of experimental data for nuclear level densities and γ strength functions of 138,139La nuclei. In the present work these nuclear properties have been measured and are used to investigate the synthesis of 138La. The results support the neutrino interactions as a dominant production process for 138La., SCOPUS: cp.p, info:eu-repo/semantics/published

Published
2015

4. First evidence of low energy enhancement in Ge isotopes

Author

Renstrøm, Therese, Bernstein, L.A., Bleuel, Darren D.L., Glodariu, Tudor, Görgen, Andreas, Hagen, T.W., Lui, Yiu-Wing, Negi, D., Ruud, I.E., Sahin, Esin, Schwengner, Ronald, Nyhus, Hilde Therese, Shima, Tatsushi, Takahisa, Keiji, Tesileanu, Ovidiu, Tornyi, T.G., Tveten, G.M., Wiedeking, M., Utsunomiya, Hiroaki, Larsen, André, Siem, Sunniva, Guttormsen, Magne, Filipescu, Dan Mihai, Gheorghe, Ioana, Goriely, Stéphane, Renstrøm, Therese, Bernstein, L.A., Bleuel, Darren D.L., Glodariu, Tudor, Görgen, Andreas, Hagen, T.W., Lui, Yiu-Wing, Negi, D., Ruud, I.E., Sahin, Esin, Schwengner, Ronald, Nyhus, Hilde Therese, Shima, Tatsushi, Takahisa, Keiji, Tesileanu, Ovidiu, Tornyi, T.G., Tveten, G.M., Wiedeking, M., Utsunomiya, Hiroaki, Larsen, André, Siem, Sunniva, Guttormsen, Magne, Filipescu, Dan Mihai, Gheorghe, Ioana, and Goriely, Stéphane

Abstract

The γ-strength functions and level densities of 73,74Ge have been extracted from particle-γ coincidence data using the Oslo method. In addition the γ-strength function of 74Ge above the neutron separation threshold, Sn = 10.196 MeV has been extracted from photoneutron measurements. When combined, these two experiments give a γ-strength function covering the energy range of ∼1-13 MeV for 74Ge. This thorough investigation of 74Ge is a part of an international campaign to study the previously reported low energy enhancement in this mass region in the γ-strength function from ∼3 MeV towards lower γ energies. The obtained data show that both 73,74Ge display an increase in strength at low γ energies., SCOPUS: cp.p, info:eu-repo/semantics/published

Published
2015

5. Upbend and M1 scissors mode in neutron-rich nuclei - Consequences for r-process (n,γ) reaction rates

Author

Larsen, André, Giacoppo, F, Guttormsen, Magne, Görgen, Andreas, Harissopulos, Sotirios, Leoni, Silvia, Liddick, Sean S.N., Naqvi, F., Nyhus, Hilde Therese, Rose, S.J., Renstrøm, Therese, Goriely, Stéphane, Schwengner, Ronald, Siem, Sunniva, Spyrou, Artemis, Tveten, G.M., Voinov, A., Wiedeking, M., Bernstein, L.A., Bleuel, Darren D.L., Bracco, Angela, Brown, Alex, Camera, Franco, Eriksen, T.K., Frauendorf, Stefan, Larsen, André, Giacoppo, F, Guttormsen, Magne, Görgen, Andreas, Harissopulos, Sotirios, Leoni, Silvia, Liddick, Sean S.N., Naqvi, F., Nyhus, Hilde Therese, Rose, S.J., Renstrøm, Therese, Goriely, Stéphane, Schwengner, Ronald, Siem, Sunniva, Spyrou, Artemis, Tveten, G.M., Voinov, A., Wiedeking, M., Bernstein, L.A., Bleuel, Darren D.L., Bracco, Angela, Brown, Alex, Camera, Franco, Eriksen, T.K., and Frauendorf, Stefan

Abstract

An enhanced probability for low-energy γ-emission (upbend, Eγ <3 MeV) at high excitation energies has been observed for several light and mediummass nuclei close to the valley of stability. Also the M1 scissors mode seen in deformed nuclei increases the γ-decay probability for low-energy γ-rays (Eγ ≈ 2-3 MeV). These phenomena, if present in neutron-rich nuclei, have the potential to increase radiative neutron-capture rates relevant for the r-process. The experimental and theoretical status of the upbend is discussed, and preliminary calculations of (n,γ) reaction rates for neutronrich, mid-mass nuclei including the scissors mode are shown., SCOPUS: cp.j, info:eu-repo/semantics/published

Published
2015

6. Photoneutron cross sections for Mo isotopes: A step toward a unified understanding of (γ,n) and (n,γ ) reactions

Author

Utsunomiya, Hiroaki, Goriely, Stéphane, Kondo, Takeo, Iwamoto, C., Akimune, H, Yamagata, Tamio, Toyokawa, Hiroyuki, Harada, H., Kitatani, Fumito, Lui, Yiu-Wing, Larsen, André, Guttormsen, Magne, Koehler, P.E., Hilaire, Stéphane, Péru, S., Martini, Marco, and Koning, Arjan J.

Subjects
Physique atomique et nucléaire
Abstract

info:eu-repo/semantics/published

Published
2013

7. Bruk av fokusgrupper i norske politiske partier : en sammenlignende studie med USA og Storbritannia

Author

Larsen, André Wallan and Sahl, Christoffer

Subjects
bedriftsledelse, mba, Social science: 200::Political science and organizational theory: 240::Public and private administration: 242 [VDP]
Abstract

Masteroppgave i bedriftsledelse (MBA) - Universitetet i Nordland, 2013 Var sperra for utlån til 2013-10-01 Fokusgruppeundersøkelser er en kvalitativ metode hvor det settes sammen en gruppe mennesker for å diskutere et eller flere temaer. Metoden har hatt stor utbredelse innenfor markedsføring etter den annen verdenskrig. Det er vanlig å ha en moderator eller møteleder til å lede gruppen, som så diskuterer og kommer med innspill innenfor de tema man ønsker å utforske. Hensikten er å få en dypere innsikt i hva folk mener, hvordan de tenker, deres følelser, holdninger og virkelighetsforståelse. Metoden har siden begynnelsen av 1980-­‐tallet også blitt tatt i bruk i politikken for å finne ut av hvilke saker som opptar velgerne, og hvordan man best kan kommuniseres et politisk budskap. Fokusgrupper ble først tatt i bruk i amerikansk og britisk politikk, og det er også her metoden fortsatt har størst utbredelse. Resultater fremkommet i fokusgruppeundersøkelser har i noen tilfeller hatt direkte innvirkning på valgresultatet både i USA og Storbritannia. Fokusgrupper har de siste årene også blitt tatt i bruk av norske politiske partier, men det foreligger lite informasjon om hvordan metoden brukes, og hva den blir brukt til. Målsettingen med oppgaven har vært å belyse hvordan fokusgrupper brukes som verktøy for politikkutvikling og kommunikasjonsutforming i norske politiske partier. De viktigste empiriske funnene i denne oppgaven er kommet som et resultat av semistrukturerte intervjuer med de norske politiske partiene. Det viser seg at bruk av fokusgrupper er relativt utbredt i norsk politikk. Metoden kan sies å ha fått fotfeste som et supplement til kvantitative undersøkelser som er veldig utbredt i Norge. De norske partiene bruker ikke fokusgrupper på samme måte som i Storbritannia og USA, og uttrykker blant annet en større skepsis til å bruke fokusgrupper i politikkutvikling. De partiene som bruker fokusgrupper gjør det først og fremst i forbindelse med kommunikasjonsutforming -­‐ til å teste ut retorikk, velgernes oppfatning av partiet, og valgkampmateriell. Noen partier bruker det også til å teste politiske saker. Under-­‐ søkelsen har vist at det er stor variasjon i hyppighet, omfang og profesjonalitet i de politiske partienes bruk av fokusgrupper. Oppgaven gir også en anbefaling på hvordan partiene kan bruke fokusgrupper mer effektivt og målrettet.

Published
2013

8. Primary gamma-ray spectra in 44Ti of astrophysical interest

Author

Larsen, André, Goriely, Stéphane, Burger, Arnold, Guttormsen, Magne, Görgen, Andreas, Harissopulos, Sotirios, Kmiecik, Maria, Konstantinopoulos, Theodore, Krticka, M., Lagoyannis, Anastasios, Lonnroth, Tom, Mazurek, Katarzyna, Norrby, Erling, Nyhus, Hilde Therese, Perdikakis, Georgios, Schiller, Andreas, Siem, Sunniva, Spyrou, Artemis, Syed, N.U.H., Toft, H.K., Tveten, G. M., and Voinov, A.

Subjects
Astrophysique, Physique atomique et nucléaire
Abstract

info:eu-repo/semantics/published

Published
2012

9. Skatterettslig håndtering av utenlandsk foretak som etablerer seg i Norge, med fokus på fast driftssted, dobbeltbeskatning og internprising

Author

Larsen, André Emil Storesund

Subjects
Økad
Abstract

Selskaper som etablerer virksomhet i Norge står overfor faren for å bli dobbelt beskattet. Slik dobbeltbeskatning utgjør et problem for investorer og eiere. Det som kan avgjøre slik problematikk er bestemmelser om virksomhetssted og fast driftssted. Hvor virksomheten er lokalisert avgjør skatteplikten. Selskaper må også forholde seg til internprising når de skal etablere virksomhet i Norge. Målet med oppgaven er å se på hvilke regler som gjelder for fast driftssted, dobbeltbeskatningstilfeller og internprising. Juridisk metode er metoden jeg bruker gjennom oppgaven. I oppgaven går jeg gjennom hvordan et utenlandsk selskap kan etablere seg i Norge med tanke på relevant selskapsform. I oppgavens hovedkapitler går jeg gjennom fast driftssted, dobbeltbeskatning og internprising. Jeg kommer med eksempler underveis som belyser temaene. Til slutt nevner jeg kort om arbeidsutleie til Norge.

Published
2011

10. Low-energy enhancement of nuclear γ strength and its impact on astrophysical reaction rates

Author

Larsen, André, Eriksen, T.K., Giacoppo, F, Guttormsen, Magne, Görgen, Andreas, Hagen, T.W., Koehler, Paul P.E., Nyhus, Hilde Therese, Renstrøm, Therese, Rose, Steven S.J., Ruud, I.E., Siem, Sunniva, Tornyi, T., Tveten, G.M., Blasi, Nives, Bracco, Angela, Burger, Arnold, Camera, Franco, Leoni, Silvia, Million, Bénédicte, Goriely, Stéphane, Harissopulos, Sotirios, Schiller, Andreas, Voinov, A., Wiedeking, M., Larsen, André, Eriksen, T.K., Giacoppo, F, Guttormsen, Magne, Görgen, Andreas, Hagen, T.W., Koehler, Paul P.E., Nyhus, Hilde Therese, Renstrøm, Therese, Rose, Steven S.J., Ruud, I.E., Siem, Sunniva, Tornyi, T., Tveten, G.M., Blasi, Nives, Bracco, Angela, Burger, Arnold, Camera, Franco, Leoni, Silvia, Million, Bénédicte, Goriely, Stéphane, Harissopulos, Sotirios, Schiller, Andreas, Voinov, A., and Wiedeking, M.

Abstract

An unexpected enhancement in the low-energy part of the γ-strength function for light and medium-mass nuclei has been discovered at the Oslo Cyclotron Laboratory. This enhancement could lead to an increase in the neutron-capture rates up to two orders of magnitude for very exotic, neutron-rich nuclei. However, it is still an open question whether this structure persists when approaching the neutron drip line. © Owned by the authors, published by EDP Sciences, 2014., SCOPUS: cp.p, info:eu-repo/semantics/published

Published
2014

11. Gas in overburden on Ekofisk

Author

Larsen, André

Subjects
stress, petroleumsteknologi, gas, overburden, Technology: 500::Rock and petroleum disciplines: 510::Petroleum engineering: 512 [VDP], Ekofisk, mobility, pore pressure
Abstract

Master's thesis in Petroleum engineering The Ekofisk field is a large producing oil and gas field located in the southern part of the Norwegian sector of the North Sea. The production started in 1971. During the production, the reservoir has been decompressed due to depletion and in 1984 it was discovered that the Ekofisk field was subsiding. In this project, quantitative data were collected and processed to determine if there is a trend of increasing volume of gas in overburden over a periodic time. This paper visualizes the development of the gas in overburden over time. After comprehensive work it seems like there is an increasing trend of more aggressive, mobile gas in the overburden at present time compared with few years ago. This development is most visible at the shallowest depths, especially at 3300 ft where the gas starts to enter the wells. This development can be explained by the fact that the reservoir has been decompressed during 30 years of production, a load the overburden could not withstand. Subsidence of the overburden have changed both the vertical and horizontal effective stresses and a corresponding development and change in cracks and channels can be the main factor of the observed increasing trend of gas over time. Gas injection on the Ekofisk field started in February 1975. The weak correlation of GOR in some wells and the fact that five wells started to produce injected gas before the bubble point was reached, indicate that gas channeling is a factor at Ekofisk. The gas can have migrated upwards the formation along the casings over a geological time period. Based the evaluation of the cuttings injection wells and the leak water injection well, 2/4-K- 22, it can be concluded that there is not a clear relationship between the injectors and the behavior of the gas in the overburden. The SE area is the least gas bearing area even if this area contains both a cuttings injector and the leak water injection well. The SW area seems to be the most gas bearing area after the division of the field into four areas, NE, NW, SE and SW.

Published
2007

12. Transitional γ strength in Cd isotopes

Author

Larsen, André, Ruud, I.E., Burger, Arnold, Goriely, Stéphane, Guttormsen, Magne, Görgen, Andreas, Hagen, T.W., Harissopulos, Sotirios, Nyhus, Hilde Therese, Renstrøm, Therese, Schiller, Andreas, Siem, Sunniva, Tveten, G.M., Voinov, A., Wiedeking, M., Larsen, André, Ruud, I.E., Burger, Arnold, Goriely, Stéphane, Guttormsen, Magne, Görgen, Andreas, Hagen, T.W., Harissopulos, Sotirios, Nyhus, Hilde Therese, Renstrøm, Therese, Schiller, Andreas, Siem, Sunniva, Tveten, G.M., Voinov, A., and Wiedeking, M.

Abstract

The level densities and γ-ray strength functions of 105 ,106,111,112Cd have been extracted from particle-γ coincidence data using the Oslo method. The level densities are in very good agreement with known levels at low excitation energy. The γ-ray strength functions display no strong enhancement for low γ energies. However, more low-energy strength is apparent for 105,106Cd than for 111,112Cd. For γ energies above ≈4 MeV, there is evidence for some extra strength, similar to what has been previously observed for the Sn isotopes. The origin of this extra strength is unclear; it might be due to E1 and M1 transitions originating from neutron skin oscillations or the spin-flip resonance, respectively. © 2013 American Physical Society., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2013

13. Transitional gamma strength in Cd isotopes

Author

Larsen, André, Ruud, I. E., Burger, Arnold, Goriely, Stéphane, Guttormsen, Magne, Görgen, Andreas, Hagen, W. T., Harissopulos, Sotirios, Nyhus, Hilde Therese, Renstrom, T., Schiller, Andreas, Siem, Sunniva, Tveten, G. M., Voinov, A., Wiedeking, M., Larsen, André, Ruud, I. E., Burger, Arnold, Goriely, Stéphane, Guttormsen, Magne, Görgen, Andreas, Hagen, W. T., Harissopulos, Sotirios, Nyhus, Hilde Therese, Renstrom, T., Schiller, Andreas, Siem, Sunniva, Tveten, G. M., Voinov, A., and Wiedeking, M.

Abstract

info:eu-repo/semantics/published

Published
2013

14. Primary γ-ray spectra in 44Ti of astrophysical interest

Author

Larsen, André, Goriely, Stéphane, Burger, Arnold, Guttormsen, Magne, Görgen, Andreas, Harissopulos, Sotirios, Kmiecik, Maria, Konstantinopoulos, Theodore, Lagoyannis, Anastasios, Lonnroth, Tom, Mazurek, Katarzyna, Norrby, Markus, Nyhus, Hilde Therese, Perdikakis, Georgios, Schiller, Andreas, Siem, Sunniva, Spyrou, Artemis, Syed, Naeem Ul Hasan, Toft, H.K., Tveten, G.M., Voinov, A., Larsen, André, Goriely, Stéphane, Burger, Arnold, Guttormsen, Magne, Görgen, Andreas, Harissopulos, Sotirios, Kmiecik, Maria, Konstantinopoulos, Theodore, Lagoyannis, Anastasios, Lonnroth, Tom, Mazurek, Katarzyna, Norrby, Markus, Nyhus, Hilde Therese, Perdikakis, Georgios, Schiller, Andreas, Siem, Sunniva, Spyrou, Artemis, Syed, Naeem Ul Hasan, Toft, H.K., Tveten, G.M., and Voinov, A.

Abstract

Primary γ-ray spectra for a wide excitation-energy range have been extracted for 44Ti from particle-γ coincidence data of the 46Ti(p,tγ)44Ti reaction. These spectra reveal information on the γ-decay pattern of the nucleus and may be used to extract the level density and radiative strength function applying the Oslo method. Models of the level density and radiative strength function are used as input for cross-section calculations of the 40Ca(α,γ)44Ti reaction. Acceptable models should reproduce data on the 40Ca(α,γ)44Ti reaction cross section as well as the measured primary γ-ray spectra. This is only achieved when a coherent normalization of the slope of the level density and radiative strength function is performed. Thus, the overall shape of the experimental primary γ-ray spectra puts a constraint on the input models for the rate calculations. © 2012 American Physical Society., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2012

15. Gamma-ray strength functions and their relation to astrophysics

Author

Larsen, André, Burger, Arnold, Görgen, Andreas, Guttormsen, Magne, Hagen, T.W., Nyhus, Hilde Therese, Rekstad, John J.B., Renstrøm, Therese, Rose, Steven S.J., Ruud, I.E., Siem, Sunniva, Syed, Naeem Ul Hasan, Toft, H.K., Tveten, G.M., Wikan, K., Goriely, Stéphane, Algin, E, Agvaanluvsan, Undraa, Lonnroth, Tom, Mitchell, Gerardine, Schiller, Andreas, Voinov, A., Larsen, André, Burger, Arnold, Görgen, Andreas, Guttormsen, Magne, Hagen, T.W., Nyhus, Hilde Therese, Rekstad, John J.B., Renstrøm, Therese, Rose, Steven S.J., Ruud, I.E., Siem, Sunniva, Syed, Naeem Ul Hasan, Toft, H.K., Tveten, G.M., Wikan, K., Goriely, Stéphane, Algin, E, Agvaanluvsan, Undraa, Lonnroth, Tom, Mitchell, Gerardine, Schiller, Andreas, and Voinov, A.

Abstract

The nuclear γ-ray strength function is one of the indispensable inputs needed for reaction-rate calculations, and is particularly important for the neutron-capture cross section. The nuclear physics group at the Oslo Cyclotron Laboratory has developed a method to extract simultaneously nuclear level density and γ-ray strength function from particle-γ coincidence measurements. Data on the strength functions of Sn nuclei as well as for lighter elements are presented. The Sn isotopes all display a resonance-like structure close to the neutron threshold, that could possibly be due to the neutron-skin oscillation mode. This so-called pygmy dipole resonance greatly influences the neutron-capture rates. In the lighter nuclei, an enhancement of the strength function at low γ energies is observed. The possible impact of this increase on Maxwellian-averaged reaction rates has been investigated. © 2011 American Institute of Physics., SCOPUS: cp.p, info:eu-repo/semantics/published

Published
2011

16. Soft structures of γ-ray strength functions studied with the Oslo method

Author

Larsen, André, Burger, Arnold, Guttormsen, Magne, Nyhus, Hilde Therese, Siem, Sunniva, Syed, Naeem Ul Hasan, Toft, H.K., Agvaanluvsan, Undraa, Bernstein, Lee L.A., Chankova, R., Mitchell, Gerardine, Goriely, Stéphane, Lonnroth, Tom, Schiller, Andreas, Voinov, A., Larsen, André, Burger, Arnold, Guttormsen, Magne, Nyhus, Hilde Therese, Siem, Sunniva, Syed, Naeem Ul Hasan, Toft, H.K., Agvaanluvsan, Undraa, Bernstein, Lee L.A., Chankova, R., Mitchell, Gerardine, Goriely, Stéphane, Lonnroth, Tom, Schiller, Andreas, and Voinov, A.

Abstract

We present experimental γ-ray strength functions up to Eγ ∼ Sn measured at the Oslo Cyclotron Laboratory for several Sc, V, Mo, and Sn isotopes. For the lighter nuclei, an unexpected enhancement of the strength function at low γ-ray energies has been revealed. This enhancement could potentially have an impact on neutron-capture cross sections for unstable, neutron-rich nuclei. For the Sn isotopes, we observe increased strength around the neutron separation energy Sn., SCOPUS: cp.p, info:eu-repo/semantics/published

Published
2010

17. Impact of a low-energy enhancement in the γ-ray strength function on the neutron-capture cross section

Author

Larsen, André, Goriely, Stéphane, Larsen, André, and Goriely, Stéphane

Abstract

A low-energy enhancement of the γ-ray strength function in several light and medium-mass nuclei has been observed recently in He3-induced reactions. The effect of this enhancement on (n,γ) cross sections is investigated for stable and unstable neutron-rich Fe, Mo, and Cd isotopes. Our results indicate that the radiative neutron capture cross sections may increase considerably due to the low-energy enhancement when approaching the neutron drip line. This could have non-negligible consequences on r-process nucleosynthesis calculations. © 2010 The American Physical Society., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2010

18. Spectroscopy of transfermium nuclei using the GABRIELA set up at the focal plane of the VASSILISSA recoil separator

Author

Hauschild, Klaus, Lopez-Martens, A., Briançon, Ch, Désesquelles, Pierre, Garcia-Santamaria, Sonsoles, Korichi, Ahmed, Robin, J., Dorvaux, O., Piot, J., Curien, Dominique, Gall, B. P J, Khalfallah, F., Khouaja, A., Roussea, M., Stuttge, Louise, Rowley, Neil, Yeremin, Alexander, Belozerov, Alexey, Chelnokov, Maxim, Chepigin, Victor, Gorshkov, V.A., Isaev, Andrey, Izosimov, Igor, Kabachenko, A.P., Katrasev, Denis, Kutznetzov, A.N., Malyshev, Oleg, Popeko, Andrei, Sagaidak, Roman, Shutov, Alexander, Sokol, Evgeny, Svirikhin, Alexander, Wiborg-Hagen, T., Guttormsen, Magne, Larsen, André, Nyhus, Hilde Therese, Siem, Sunniva, Syed, Naeem Ul Hasan, Hanappe, Francis, Hauschild, Klaus, Lopez-Martens, A., Briançon, Ch, Désesquelles, Pierre, Garcia-Santamaria, Sonsoles, Korichi, Ahmed, Robin, J., Dorvaux, O., Piot, J., Curien, Dominique, Gall, B. P J, Khalfallah, F., Khouaja, A., Roussea, M., Stuttge, Louise, Rowley, Neil, Yeremin, Alexander, Belozerov, Alexey, Chelnokov, Maxim, Chepigin, Victor, Gorshkov, V.A., Isaev, Andrey, Izosimov, Igor, Kabachenko, A.P., Katrasev, Denis, Kutznetzov, A.N., Malyshev, Oleg, Popeko, Andrei, Sagaidak, Roman, Shutov, Alexander, Sokol, Evgeny, Svirikhin, Alexander, Wiborg-Hagen, T., Guttormsen, Magne, Larsen, André, Nyhus, Hilde Therese, Siem, Sunniva, Syed, Naeem Ul Hasan, and Hanappe, Francis

Abstract

An IN2P3-JINR collaboration has launched a project called GABRIELA at the Flerov Laboratory for Nuclear Reactions (FLNR) within the Joint Institute for Nuclear Research (JINR) in Dubna (Russia). The goal of the project is to perform gamma-ray and internal conversion electron spectroscopy of heavy nuclei produced in fusion-evaporation reactions and transported to the focal plane of the recoil separator VASSILISSA. During five experimental campaigns of GABRIELA, the detection system has gained in sensitivity and new spectroscopic information has been obtained for 249Fm, 251Fm, 253No and 255Lr. © 2010 American Institute of Physics., SCOPUS: cp.p, info:eu-repo/semantics/published

Published
2010

19. Soft structures of gamma-ray strength functions studied with the Oslo method

Author

Larsen, André, Agvaanluvsan, Undraa, Bernstein, L.A., Burger, Arnold, Chankova, R., Goriely, Stéphane, Guttormsen, Magne, Lonnroth, Tom, Mitchell, Gerardine, Nyhus, Hilde Therese, Schiller, Andreas, Siem, Sunniva, Syed, N.U.H., Toft, H.K., Voinov, A., Larsen, André, Agvaanluvsan, Undraa, Bernstein, L.A., Burger, Arnold, Chankova, R., Goriely, Stéphane, Guttormsen, Magne, Lonnroth, Tom, Mitchell, Gerardine, Nyhus, Hilde Therese, Schiller, Andreas, Siem, Sunniva, Syed, N.U.H., Toft, H.K., and Voinov, A.

Abstract

info:eu-repo/semantics/published

Published
2010

21. High-K,t1/2=1.4(1) ms, isomeric state in Lr255

Author

Hauschild, Klaus, Lopez-Martens, A., Yeremin, Alexander, Dorvaux, O., Antalic, S., Belozerov, Alexey, Briançon, Ch, Chelnokov, Maxim, Chepigin, Victor, Curien, Dominique, Gall, B. P J, Görgen, Andreas, Gorshkov, V.A., Guttormsen, Magne, Hanappe, Francis, Kabachenko, A.P., Khalfallah, F., Larsen, André, Malyshev, Oleg, Minkova, Ani, Popeko, Andrei, Rousseau, Marc, Rowley, Neil, Saro, Štefan, Shutov, Alexander, Siem, Sunniva, Stuttge, Louise, Svirikhin, Alexander, Syed, Naeem Ul Hasan, Theisen, Ch, Venhart, M., Hauschild, Klaus, Lopez-Martens, A., Yeremin, Alexander, Dorvaux, O., Antalic, S., Belozerov, Alexey, Briançon, Ch, Chelnokov, Maxim, Chepigin, Victor, Curien, Dominique, Gall, B. P J, Görgen, Andreas, Gorshkov, V.A., Guttormsen, Magne, Hanappe, Francis, Kabachenko, A.P., Khalfallah, F., Larsen, André, Malyshev, Oleg, Minkova, Ani, Popeko, Andrei, Rousseau, Marc, Rowley, Neil, Saro, Štefan, Shutov, Alexander, Siem, Sunniva, Stuttge, Louise, Svirikhin, Alexander, Syed, Naeem Ul Hasan, Theisen, Ch, and Venhart, M.

Abstract

An isomeric state in Lr255 with a half-life of t1/2=1.4(1) ms and Ex>720-keV has been observed for the first time using the GABRIELA setup at the focal plane of the VASSILISSA separator. Based on its K-forbiddeness, the configuration of the state is most probably formed by coupling the valence proton to a two quasiparticle neutron excitation. Possible three quasiparticle configurations are discussed. © 2008 The American Physical Society., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2008

22. Isomeric states in 253No

Author

Lopez-Martens, A., Hauschild, Klaus, Yeremin, Alexander, Dorvaux, O., Belozerov, Alexey, Briançon, Ch, Chelnokov, Maxim, Chepigin, Victor, Curien, Dominique, Désesquelles, Pierre, Gall, B. P J, Gorshkov, V.A., Guttormsen, Magne, Hanappe, Francis, Kabachenko, A.P., Khalfallah, F., Korichi, Ahmed, Larsen, André, Malyshev, Oleg, Minkova, Ani, Oganessian, Yu.Ts., Popeko, Andrei, Rousseau, Marc, Rowley, Neil, Sagaidak, Roman, Sharo, S., Shutov, Alexander, Siem, Sunniva, Stuttge, Louise, Svirikhin, Alexander, Syed, Naeem Ul Hasan, Theisen, Ch, Lopez-Martens, A., Hauschild, Klaus, Yeremin, Alexander, Dorvaux, O., Belozerov, Alexey, Briançon, Ch, Chelnokov, Maxim, Chepigin, Victor, Curien, Dominique, Désesquelles, Pierre, Gall, B. P J, Gorshkov, V.A., Guttormsen, Magne, Hanappe, Francis, Kabachenko, A.P., Khalfallah, F., Korichi, Ahmed, Larsen, André, Malyshev, Oleg, Minkova, Ani, Oganessian, Yu.Ts., Popeko, Andrei, Rousseau, Marc, Rowley, Neil, Sagaidak, Roman, Sharo, S., Shutov, Alexander, Siem, Sunniva, Stuttge, Louise, Svirikhin, Alexander, Syed, Naeem Ul Hasan, and Theisen, Ch

Abstract

Isomeric states in 253No have been investigated by conversion electron and γ -ray spectroscopy with the GABRIELA detection system. The 31μs isomer reported more than 30 years ago is found to decay to the ground state of 253No by the emission of a 167keV M2 transition. The spin and parity of this low-lying isomeric state are established to be 5/2 + .The presence of another longer-lived isomeric state is also discussed. © Società Italiana di Fisica and Springer-Verlag 2007., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2007

23. Detailed spectroscopy of Fm249

Author

Lopez-Martens, A., Hauschild, Klaus, Yeremin, Alexander, Belozerov, Alexey, Briançon, Ch, Chelnokov, Maxim, Chepigin, Victor, Curien, Dominique, Dorvaux, O., Gall, B. P J, Gorshkov, V.A., Guttormsen, Magne, Hanappe, Francis, Kabachenko, A.P., Khalfallah, F., Korichi, Ahmed, Larsen, André, Malyshev, Oleg, Minkova, Ani, Oganessian, Yu.Ts., Popeko, Andrei, Rousseau, Marc, Rowley, Neil, Sagaidak, Roman, Sharo, S., Shutov, Alexander, Siem, Sunniva, Svirikhin, Alexander, Syed, Naeem Ul Hasan, Theisen, Ch, Lopez-Martens, A., Hauschild, Klaus, Yeremin, Alexander, Belozerov, Alexey, Briançon, Ch, Chelnokov, Maxim, Chepigin, Victor, Curien, Dominique, Dorvaux, O., Gall, B. P J, Gorshkov, V.A., Guttormsen, Magne, Hanappe, Francis, Kabachenko, A.P., Khalfallah, F., Korichi, Ahmed, Larsen, André, Malyshev, Oleg, Minkova, Ani, Oganessian, Yu.Ts., Popeko, Andrei, Rousseau, Marc, Rowley, Neil, Sagaidak, Roman, Sharo, S., Shutov, Alexander, Siem, Sunniva, Svirikhin, Alexander, Syed, Naeem Ul Hasan, and Theisen, Ch

Abstract

Excited states in Fm249 were populated via the α decay of No253 and the subsequent decay was observed with the GABRIELA detection system installed at the focal plane of the VASSILISSA recoil separator. The energies, spins, and parities of these states could be established through combined α,γ, and conversion-electron spectroscopy. The first members of the ground-state rotational band were identified. Their excitation energies as well as the observation of a cross-over E2 transition confirm the assignment of 7/2+[624] for the ground state of Fm249. Two excited states were also observed and their decay properties suggest that they correspond to the particle excitation 9/2-[734] and hole excitation 5/2+[622]. The analysis suggests that the 279-keV transition de-exciting the 9/2- state has anomalous E1 conversion coefficients. © 2006 The American Physical Society., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2006

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