NA'URORIN GANO NEUTRINO UKU, HUKUNCI ƊAYA

Neutrino suna zuwa iri uku, kuma suna sauyawa daga wani iri zuwa wani yayin da suke tafiya — suna oscillation (sauyawa-da-komowa). Neutrino na sararin samaniyar duniya (atmospheric neutrinos) sun taka muhimmiyar rawa wajen nuna wannan, da kuma tabbatar da cewa neutrino suna da nauyi. Amma wata tambaya ta asali game da waɗannan nauyoyi har yanzu ba a amsa ta ba: tsarinsu. Shin yanayin nauyi na uku ne mafi nauyi a cikin ukun — tsarin “na al’ada” — ko kuma mafi sauƙi, tsarin “na juye”?

Amsar tana da muhimmanci fiye da neutrino kansu, in ji marubutan: tana da alaƙa da yiwuwar yanayin “Majorana” na neutrino, wata babbar tambaya da ba a amsa ba, kuma tana da alaƙa da ma’aunan ilimin sararin samaniya (cosmology), waɗanda a yanzu suka fi goyon bayan tsarin na al’ada.

Na’urori uku, lissafi ɗaya

Miaochen Jin da Carlos Argüelles a Jami’ar Harvard, tare da Pablo Fernández-Menéndez (Santiago de Compostela) da Iván Martínez-Soler (Madrid da Durham), sun haɗa bayanan jama’a na na’urori uku da ke kallon neutrino iri ɗaya:

• Super-Kamiokande, tan 50,000 na ruwa a cikin wani ma’adanin Japan, da dukkan bayanansa na ruwa tsantsa: kwanaki 6,511 na lura.
• IceCube-DeepCore, tsakiya mai cunkoso na wata na’ura da aka binne tsakanin mita 1,450 zuwa 2,450 a zurfin ƙanƙara a Kudancin Duniya (South Pole): shekaru 8 na bayanai.
• KM3NeT/ORCA, wadda har yanzu ake ginawa a Tekun Bahar Rum, da layukan ganowa shida na farko: kwanaki 510 da abubuwan da suka faru 5,828.

Haɗe-haɗen da aka yi a baya kawai suna tara sakamakon da aka wallafa ne. A nan, ana lissafa dukkan samfuran abubuwan da suka faru a lokaci guda. Tunda na’urorin uku suna ganin kwararar neutrino iri ɗaya da ke mu’amala da ruwa iri ɗaya, rashin tabbas game da wannan kwarara da waɗannan mu’amaloli na tare ne a tsakaninsu. Babban adadin bayanan wani gwaji kuma yana taimakawa wajen tantance kurakuran da da in ba haka ba za su ɓata na wani.

A cikin aikin, tawagar ta gano wani kuskure (bug) a cikin bayanan jama’a da Super-Kamiokande ta fitar. Ƙungiyar ta tabbatar da shi kuma ta ba da sigar da aka gyara, wadda aka yi amfani da ita a nan kafin a fitar da ita ga jama’a.

Sama: yankunan da aka yarda da su na ma’aunai biyu na sauyawar neutrino daga kowace na’ura da kuma daga haɗin (baƙi). Ƙasa: sakamakon da aka lura (layin baƙi) idan aka kwatanta da dubban gwaje-gwajen da aka kwaikwaya bisa tsarin na al’ada (shuɗi) ko na juye (lemu). — Figure 1, Jin, Argüelles, Fernández-Menéndez & Martínez-Soler (2026), arXiv:2610.12208, CC BY 4.0.

Kowace alama tana ƙarawa

Ita kaɗai, kowace na’ura tana ɗan karkata ne kawai zuwa tsarin na al’ada. Idan aka haɗa su, fifikon ya bayyana sarai: lissafin ya fi muni da raka’a 11.0 na ƙididdigar gwaji a ƙarƙashin tsarin juye. Don mayar da wannan zuwa yiwuwa, tawagar ta kwaikwayi gwaje-gwajen bogi 4,397 a cikin wata duniya mai tsarin juye. 2 ne kawai suka ba da sakamako mai tsanani kamar bayanan gaskiya. An cire tsarin juye da amincewa ta kashi 99.95%, wato sigma 3.3.

Daga ina alamar take fitowa? Neutrino masu ƙarfi tsakanin biliyan 2 zuwa 10 na electronvolt da ke ratsa ƙasan doron ƙasa (mantle) da tsakiyarta (core) suna sauyawa daban-daban gwargwadon tsarin. A tsarin na al’ada, abin da suke ratsawa yana ƙara sauyawar neutrino maimakon antineutrino, kuma dukkan na’urorin uku suna amsa wannan ƙari tare.

Daidaito kyauta

Wannan lissafin ɗaya yana auna wasu halaye na neutrino ba tare da wani na’urar hanzarta ƙwayoyi (particle accelerator) ba:

• bambancin nauyi da ke haddasa waɗannan sauyawa zuwa kashi 2.2%, da wani kusurwar haɗuwa (mixing angle) zuwa kashi 6.1%, abin da marubutan suka ce yana gogayya da gwaje-gwajen na’urorin hanzarta ƙwayoyi;
• wani kusurwar haɗuwa da ya dace da mafi girman ƙimar da za ta yiwu;
• ƙayyadewa a kan fasalin karya daidaiton CP (CP-violating phase) — wani adadi da ke da alaƙa da rashin daidaito tsakanin abu (matter) da kishiyar abu (antimatter) — wanda bai dogara ga wani gwajin harba neutrino kwata-kwata ba.

Ba gano ba tukuna

Akwai gargaɗi da yawa tare da sakamakon. Sake nazari ne mai zaman kansa na bayanan jama’a, ba sakamakon hukuma na ƙungiyoyin uku ba. Wani ma’aunin ƙididdiga mafi taka-tsantsan yana rage muhimmancin zuwa sigma 2.55. Ingancin lissafin gaba ɗaya matsakaici ne (yiwuwa ta 0.011), saboda bayanan ORCA, kuma tarin bayanai ukun suna nuna ɗan saɓani na sigma 2.2 a tsakaninsu. Marubutan sun bayyana cewa kayan aikin AI, waɗanda ba su ambaci sunayensu ba, sun taimaka wajen shirya rubutun, zane-zanen da kuma lambar kwamfuta.

Hasashensu: ƙara bayanan gwajin na’urar nukiliya ta JUNO zuwa wannan bayanan na sararin samaniyar duniya zai iya, bisa ƙiyasinsu na kusa-kusa, kawo amsar kusa da sigma 4 — adadin da suka ce har yanzu yana buƙatar cikakken kwaikwayo na haɗin gwiwa. “Tsarin na al’ada yana ƙara bayyana,” in ji su.