Absolute cross sections and excitation functions for deuteron induced reactions on chromium between 2 and 12 MeV

Deuteron and proton induced nuclear reactions / Enriched 50 Cr and nat Cr targets / Positron emitter 51 Mn / Excitation function / Radiochemical separation / Thick target yieldSummary. The positron emitter 51 Mn (t1/ 2 ϭ 46.2 min, Iβϩ ϭ 97%) is of potential interest in positron emission tomography (PET). With a view to optimizing its production route, excitation functions for deuteron induced nuclear reactions on isotopically enriched (ϳ95%) 50 Cr were determined radiochemically over the energy range of 3 to 13 MeV and for proton induced nuclear reactions on nat Cr in the range of 18 to 38 MeV. Cross sections are presented for the reactions: 50 Cr(d,2n) 50m Mn, 50 Cr(d,n) 51 Mn, 50 Cr(d,t) 49 Cr, 50 Cr(d,p) 51 Cr, 50 Cr(d,A) 48 V, 52 Cr(d,2p) 52 V, nat Cr(p,x) 51 Mn, nat Cr(p,x) 52 Mn, nat

Section: Deuteron Induced Nuclear Reactionscontrasting

confidence: 86%

“…However, the cross section data are not well known. The excitation function was first determined by Cogneau et al [9] using natural chromium as target and a GM counter for activity measurement. For the nat Cr(p,x) 51 Mn process, on the other hand, no cross section data were available up to now.…”

Section: Introductionmentioning

confidence: 99%

Investigation of ⁵⁰Cr(d,n)⁵¹Mn and ^natCr(p,x)⁵¹Mn processes with respect to the production of the positron emitter ⁵¹Mn

Klein¹,

Rösch²,

Qaim³

2000

“…From Fig. 1 it can be seen that above 12 MeV the present results disagree with all the other measurements [6][7][8][9], which are about 300 mb lower. The maximum cross section for the 52 Cr(d, 2n) S2m +g Mn estimated from the systematics [1] is 900 mb, which is considerably higher then the experimental value of about 550 mb.…”

Section: Resultscontrasting

confidence: 72%

“…For these reactions the maximum cross sections obtained from published data [5][6][7][8][9][10] do not agree with the predictions of the systematics [1][2][3][4].…”

Section: Introductioncontrasting

confidence: 63%

Cross sections for the Reactions ⁶⁶Zn(d,n)⁶⁷Ga, ⁵²Cr(d,2n)^52gMn and 186 W (d,2n)¹⁸⁶Re

Nassiff

Münzel

1973

Experimental cross sections for the reactions 66 Zn(d, n) 67 Ga, S2 Cr(d, 2n)" g Mn, and l86 W(d, 2n) 186 Re are reported. The values obtained are compared with the cross sections expected from the systematics. Zusammenfassung Es werden experimentelle Wirkungsquerschnitte für die Reaktionen 66 Zn(d, n) 67 Ga, 52 Cr(d, 2n)" g Mn und 186 W(d, 2n) 186 Re angegeben. Die erhaltenen Werte werden verglichen mit Wirkungsquerschnitten, die aufgrund einer Systematik abgeschätzt wurden. Risumi On^ourni des valeurs experimentales de sections efficaces pour les reactions b6 Zn(d, n) 67 Ga, 52 Cr(d, 2n) S2 Mnet 186 W(d, 2n) 186 Re. Les valeurs obtenues sont comparees aux sections efficaces estimees d'apres une systematique.

“…52m Mn of high radionuclidic purity is only available from the 52 Fe/ 52m Mn generator [12][13][14][15][16][17][18][19][20], since direct nuclear reactions, such as the 52 Cr( p, 2n) process, always lead to an isomeric mixture [3,4]. The almost pure positron emitter 51 Mn in comparison has a suitable half-life and can be produced at a small cyclotron in high radionuclidic purity using the 50 Cr(d, n) reaction [3,21]. After the bombardment, the generated n.c.a.…”

Section: Introductionmentioning

confidence: 99%

Production of the positron emitter ⁵¹Mn via the ⁵⁰Cr(d, n) reaction: targetry and separation of no-carrier-added radiomanganese

Klein¹,

Rösch²,

Coenen³

et al. 2002

Nuclear reaction / Separation of positron emitter 51 Mn / Ion exchange chromatography / Solid phase extraction / Liquid-liquid extraction / Enriched target recoverySummary. In connection with the production of 46.2 min 51 Mn via the 50 Cr(d, n)-process, several separation techniques such as ion exchange chromatography, solid phase extraction, liquid-liquid extraction and co-precipitation have been investigated; the aim was to separate no-carrier-added radiomanganese from the bulk target chromium. Among the separation systems * Mn II /Cr III , * Mn II /Cr VI and * Mn IV /Cr VI , the latter applying the co-precipitation of * Mn IV with Fe III hydroxide was found to be the optimum; the removal of chromium was rapid and quantitative (remaining content < 0.05%) and the separation efficiency was high (99.3% radiochemical yield of * Mn). For production purposes, a sandwiched pellet of the chemical composition Al 4 · 50 CrCl 3 was developed as a new target. This allowed a quick dissolution after irradiation, thus enabling a fast separation of 51 Mn and its production on a MBq scale. A 1 h irradiation at 3 µA (wobbled beam) over an effective deuteron energy range of E d = 12.8 → 7.9 MeV yielded 107 MBq 51 Mn. Simultaneously formed nuclides of other elements, such as 38 Cl, 24 Na, 48 V and 51 Cr were quantitatively separated using the proposed procedure. Only the shorter-lived radioisotope 52m Mn, formed via the 52 Cr(d, 2n) 52m Mn reaction, was present at a low level of 2%, if the enrichment of 50 Cr was 95% (with ∼ 5% 52 Cr).